mfd: mt6370: Add MediaTek MT6370 support
This adds support for the MediaTek MT6370 SubPMIC. MediaTek MT6370 is a SubPMIC consisting of a single cell battery charger with ADC monitoring, RGB LEDs, dual channel flashlight, WLED backlight driver, display bias voltage supply, one general purpose LDO, and the USB Type-C & PD controller complies with the latest USB Type-C and PD standards. Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> Signed-off-by: ChiYuan Huang <cy_huang@richtek.com> Signed-off-by: ChiaEn Wu <chiaen_wu@richtek.com> Signed-off-by: Lee Jones <lee@kernel.org> Link: https://lore.kernel.org/r/20220805070610.3516-8-peterwu.pub@gmail.com
This commit is contained in:
ChiYuan Huang
Lee Jones
parent
7f915eef50
commit
b2adf788e6
@ -938,6 +938,22 @@ config MFD_MT6360
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PMIC part includes 2-channel BUCKs and 2-channel LDOs
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LDO part includes 4-channel LDOs
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config MFD_MT6370
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tristate "MediaTek MT6370 SubPMIC"
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select MFD_CORE
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select REGMAP_I2C
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select REGMAP_IRQ
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depends on I2C
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help
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Say Y here to enable MT6370 SubPMIC functional support.
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It consists of a single cell battery charger with ADC monitoring, RGB
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LEDs, dual channel flashlight, WLED backlight driver, display bias
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voltage supply, one general purpose LDO, and the USB Type-C & PD
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controller complies with the latest USB Type-C and PD standards.
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This driver can also be built as a module. If so, the module
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will be called "mt6370".
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config MFD_MT6397
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tristate "MediaTek MT6397 PMIC Support"
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select MFD_CORE
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@ -176,6 +176,7 @@ obj-$(CONFIG_MFD_MAX8998) += max8998.o max8998-irq.o
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obj-$(CONFIG_MFD_MP2629) += mp2629.o
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obj-$(CONFIG_MFD_MT6360) += mt6360-core.o
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obj-$(CONFIG_MFD_MT6370) += mt6370.o
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mt6397-objs := mt6397-core.o mt6397-irq.o mt6358-irq.o
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obj-$(CONFIG_MFD_MT6397) += mt6397.o
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312
drivers/mfd/mt6370.c
Normal file
312
drivers/mfd/mt6370.c
Normal file
@ -0,0 +1,312 @@
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2022 Richtek Technology Corp.
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*
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* Author: ChiYuan Huang <cy_huang@richtek.com>
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*/
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#include <linux/bits.h>
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#include <linux/bitfield.h>
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#include <linux/i2c.h>
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#include <linux/interrupt.h>
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#include <linux/kernel.h>
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#include <linux/mfd/core.h>
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#include <linux/module.h>
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#include <linux/regmap.h>
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#include "mt6370.h"
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#define MT6370_REG_DEV_INFO 0x100
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#define MT6370_REG_CHG_IRQ1 0x1C0
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#define MT6370_REG_CHG_MASK1 0x1E0
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#define MT6370_REG_MAXADDR 0x1FF
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#define MT6370_VENID_MASK GENMASK(7, 4)
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#define MT6370_NUM_IRQREGS 16
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#define MT6370_USBC_I2CADDR 0x4E
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#define MT6370_MAX_ADDRLEN 2
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#define MT6370_VENID_RT5081 0x8
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#define MT6370_VENID_RT5081A 0xA
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#define MT6370_VENID_MT6370 0xE
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#define MT6370_VENID_MT6371 0xF
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#define MT6370_VENID_MT6372P 0x9
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#define MT6370_VENID_MT6372CP 0xB
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static const struct regmap_irq mt6370_irqs[] = {
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REGMAP_IRQ_REG_LINE(MT6370_IRQ_DIRCHGON, 8),
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REGMAP_IRQ_REG_LINE(MT6370_IRQ_CHG_TREG, 8),
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REGMAP_IRQ_REG_LINE(MT6370_IRQ_CHG_AICR, 8),
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REGMAP_IRQ_REG_LINE(MT6370_IRQ_CHG_MIVR, 8),
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REGMAP_IRQ_REG_LINE(MT6370_IRQ_PWR_RDY, 8),
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REGMAP_IRQ_REG_LINE(MT6370_IRQ_FL_CHG_VINOVP, 8),
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REGMAP_IRQ_REG_LINE(MT6370_IRQ_CHG_VSYSUV, 8),
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REGMAP_IRQ_REG_LINE(MT6370_IRQ_CHG_VSYSOV, 8),
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REGMAP_IRQ_REG_LINE(MT6370_IRQ_CHG_VBATOV, 8),
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REGMAP_IRQ_REG_LINE(MT6370_IRQ_CHG_VINOVPCHG, 8),
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REGMAP_IRQ_REG_LINE(MT6370_IRQ_TS_BAT_COLD, 8),
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REGMAP_IRQ_REG_LINE(MT6370_IRQ_TS_BAT_COOL, 8),
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REGMAP_IRQ_REG_LINE(MT6370_IRQ_TS_BAT_WARM, 8),
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REGMAP_IRQ_REG_LINE(MT6370_IRQ_TS_BAT_HOT, 8),
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REGMAP_IRQ_REG_LINE(MT6370_IRQ_TS_STATC, 8),
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REGMAP_IRQ_REG_LINE(MT6370_IRQ_CHG_FAULT, 8),
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REGMAP_IRQ_REG_LINE(MT6370_IRQ_CHG_STATC, 8),
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REGMAP_IRQ_REG_LINE(MT6370_IRQ_CHG_TMR, 8),
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REGMAP_IRQ_REG_LINE(MT6370_IRQ_CHG_BATABS, 8),
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REGMAP_IRQ_REG_LINE(MT6370_IRQ_CHG_ADPBAD, 8),
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REGMAP_IRQ_REG_LINE(MT6370_IRQ_CHG_RVP, 8),
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REGMAP_IRQ_REG_LINE(MT6370_IRQ_TSHUTDOWN, 8),
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REGMAP_IRQ_REG_LINE(MT6370_IRQ_CHG_IINMEAS, 8),
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REGMAP_IRQ_REG_LINE(MT6370_IRQ_CHG_ICCMEAS, 8),
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REGMAP_IRQ_REG_LINE(MT6370_IRQ_CHGDET_DONE, 8),
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REGMAP_IRQ_REG_LINE(MT6370_IRQ_WDTMR, 8),
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REGMAP_IRQ_REG_LINE(MT6370_IRQ_SSFINISH, 8),
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REGMAP_IRQ_REG_LINE(MT6370_IRQ_CHG_RECHG, 8),
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REGMAP_IRQ_REG_LINE(MT6370_IRQ_CHG_TERM, 8),
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REGMAP_IRQ_REG_LINE(MT6370_IRQ_CHG_IEOC, 8),
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REGMAP_IRQ_REG_LINE(MT6370_IRQ_ADC_DONE, 8),
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REGMAP_IRQ_REG_LINE(MT6370_IRQ_PUMPX_DONE, 8),
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REGMAP_IRQ_REG_LINE(MT6370_IRQ_BST_BATUV, 8),
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REGMAP_IRQ_REG_LINE(MT6370_IRQ_BST_MIDOV, 8),
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REGMAP_IRQ_REG_LINE(MT6370_IRQ_BST_OLP, 8),
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REGMAP_IRQ_REG_LINE(MT6370_IRQ_ATTACH, 8),
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REGMAP_IRQ_REG_LINE(MT6370_IRQ_DETACH, 8),
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REGMAP_IRQ_REG_LINE(MT6370_IRQ_HVDCP_STPDONE, 8),
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REGMAP_IRQ_REG_LINE(MT6370_IRQ_HVDCP_VBUSDET_DONE, 8),
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REGMAP_IRQ_REG_LINE(MT6370_IRQ_HVDCP_DET, 8),
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REGMAP_IRQ_REG_LINE(MT6370_IRQ_CHGDET, 8),
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REGMAP_IRQ_REG_LINE(MT6370_IRQ_DCDT, 8),
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REGMAP_IRQ_REG_LINE(MT6370_IRQ_DIRCHG_VGOK, 8),
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REGMAP_IRQ_REG_LINE(MT6370_IRQ_DIRCHG_WDTMR, 8),
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REGMAP_IRQ_REG_LINE(MT6370_IRQ_DIRCHG_UC, 8),
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REGMAP_IRQ_REG_LINE(MT6370_IRQ_DIRCHG_OC, 8),
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REGMAP_IRQ_REG_LINE(MT6370_IRQ_DIRCHG_OV, 8),
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REGMAP_IRQ_REG_LINE(MT6370_IRQ_OVPCTRL_SWON, 8),
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REGMAP_IRQ_REG_LINE(MT6370_IRQ_OVPCTRL_UVP_D, 8),
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REGMAP_IRQ_REG_LINE(MT6370_IRQ_OVPCTRL_UVP, 8),
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REGMAP_IRQ_REG_LINE(MT6370_IRQ_OVPCTRL_OVP_D, 8),
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REGMAP_IRQ_REG_LINE(MT6370_IRQ_OVPCTRL_OVP, 8),
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REGMAP_IRQ_REG_LINE(MT6370_IRQ_FLED_STRBPIN, 8),
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REGMAP_IRQ_REG_LINE(MT6370_IRQ_FLED_TORPIN, 8),
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REGMAP_IRQ_REG_LINE(MT6370_IRQ_FLED_TX, 8),
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REGMAP_IRQ_REG_LINE(MT6370_IRQ_FLED_LVF, 8),
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REGMAP_IRQ_REG_LINE(MT6370_IRQ_FLED2_SHORT, 8),
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REGMAP_IRQ_REG_LINE(MT6370_IRQ_FLED1_SHORT, 8),
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REGMAP_IRQ_REG_LINE(MT6370_IRQ_FLED2_STRB, 8),
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REGMAP_IRQ_REG_LINE(MT6370_IRQ_FLED1_STRB, 8),
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REGMAP_IRQ_REG_LINE(mT6370_IRQ_FLED2_STRB_TO, 8),
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REGMAP_IRQ_REG_LINE(MT6370_IRQ_FLED1_STRB_TO, 8),
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REGMAP_IRQ_REG_LINE(MT6370_IRQ_FLED2_TOR, 8),
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REGMAP_IRQ_REG_LINE(MT6370_IRQ_FLED1_TOR, 8),
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REGMAP_IRQ_REG_LINE(MT6370_IRQ_OTP, 8),
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REGMAP_IRQ_REG_LINE(MT6370_IRQ_VDDA_OVP, 8),
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REGMAP_IRQ_REG_LINE(MT6370_IRQ_VDDA_UV, 8),
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REGMAP_IRQ_REG_LINE(MT6370_IRQ_LDO_OC, 8),
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REGMAP_IRQ_REG_LINE(MT6370_IRQ_BLED_OCP, 8),
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REGMAP_IRQ_REG_LINE(MT6370_IRQ_BLED_OVP, 8),
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REGMAP_IRQ_REG_LINE(MT6370_IRQ_DSV_VNEG_OCP, 8),
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REGMAP_IRQ_REG_LINE(MT6370_IRQ_DSV_VPOS_OCP, 8),
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REGMAP_IRQ_REG_LINE(MT6370_IRQ_DSV_BST_OCP, 8),
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REGMAP_IRQ_REG_LINE(MT6370_IRQ_DSV_VNEG_SCP, 8),
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REGMAP_IRQ_REG_LINE(MT6370_IRQ_DSV_VPOS_SCP, 8),
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};
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static const struct regmap_irq_chip mt6370_irq_chip = {
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.name = "mt6370-irqs",
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.status_base = MT6370_REG_CHG_IRQ1,
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.mask_base = MT6370_REG_CHG_MASK1,
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.num_regs = MT6370_NUM_IRQREGS,
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.irqs = mt6370_irqs,
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.num_irqs = ARRAY_SIZE(mt6370_irqs),
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};
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static const struct resource mt6370_regulator_irqs[] = {
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DEFINE_RES_IRQ_NAMED(MT6370_IRQ_DSV_VPOS_SCP, "db_vpos_scp"),
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DEFINE_RES_IRQ_NAMED(MT6370_IRQ_DSV_VNEG_SCP, "db_vneg_scp"),
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DEFINE_RES_IRQ_NAMED(MT6370_IRQ_DSV_BST_OCP, "db_vbst_ocp"),
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DEFINE_RES_IRQ_NAMED(MT6370_IRQ_DSV_VPOS_OCP, "db_vpos_ocp"),
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DEFINE_RES_IRQ_NAMED(MT6370_IRQ_DSV_VNEG_OCP, "db_vneg_ocp"),
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DEFINE_RES_IRQ_NAMED(MT6370_IRQ_LDO_OC, "ldo_oc"),
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};
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static const struct mfd_cell mt6370_devices[] = {
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MFD_CELL_OF("mt6370-adc",
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NULL, NULL, 0, 0, "mediatek,mt6370-adc"),
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MFD_CELL_OF("mt6370-charger",
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NULL, NULL, 0, 0, "mediatek,mt6370-charger"),
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MFD_CELL_OF("mt6370-flashlight",
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NULL, NULL, 0, 0, "mediatek,mt6370-flashlight"),
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MFD_CELL_OF("mt6370-indicator",
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NULL, NULL, 0, 0, "mediatek,mt6370-indicator"),
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MFD_CELL_OF("mt6370-tcpc",
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NULL, NULL, 0, 0, "mediatek,mt6370-tcpc"),
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MFD_CELL_RES("mt6370-regulator", mt6370_regulator_irqs),
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};
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static const struct mfd_cell mt6370_exclusive_devices[] = {
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MFD_CELL_OF("mt6370-backlight",
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NULL, NULL, 0, 0, "mediatek,mt6370-backlight"),
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};
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static const struct mfd_cell mt6372_exclusive_devices[] = {
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MFD_CELL_OF("mt6370-backlight",
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NULL, NULL, 0, 0, "mediatek,mt6372-backlight"),
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};
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static int mt6370_check_vendor_info(struct device *dev, struct regmap *rmap,
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int *vid)
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{
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unsigned int devinfo;
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int ret;
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ret = regmap_read(rmap, MT6370_REG_DEV_INFO, &devinfo);
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if (ret)
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return ret;
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*vid = FIELD_GET(MT6370_VENID_MASK, devinfo);
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switch (*vid) {
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case MT6370_VENID_RT5081:
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case MT6370_VENID_RT5081A:
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case MT6370_VENID_MT6370:
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case MT6370_VENID_MT6371:
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case MT6370_VENID_MT6372P:
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case MT6370_VENID_MT6372CP:
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return 0;
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default:
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dev_err(dev, "Unknown Vendor ID 0x%02x\n", devinfo);
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return -ENODEV;
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}
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}
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static int mt6370_regmap_read(void *context, const void *reg_buf,
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size_t reg_size, void *val_buf, size_t val_size)
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{
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struct mt6370_info *info = context;
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const u8 *u8_buf = reg_buf;
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u8 bank_idx, bank_addr;
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int ret;
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bank_idx = u8_buf[0];
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bank_addr = u8_buf[1];
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ret = i2c_smbus_read_i2c_block_data(info->i2c[bank_idx], bank_addr,
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val_size, val_buf);
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if (ret < 0)
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return ret;
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if (ret != val_size)
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return -EIO;
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return 0;
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}
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static int mt6370_regmap_write(void *context, const void *data, size_t count)
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{
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struct mt6370_info *info = context;
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const u8 *u8_buf = data;
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u8 bank_idx, bank_addr;
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int len = count - MT6370_MAX_ADDRLEN;
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bank_idx = u8_buf[0];
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bank_addr = u8_buf[1];
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return i2c_smbus_write_i2c_block_data(info->i2c[bank_idx], bank_addr,
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len, data + MT6370_MAX_ADDRLEN);
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}
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static const struct regmap_bus mt6370_regmap_bus = {
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.read = mt6370_regmap_read,
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.write = mt6370_regmap_write,
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};
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static const struct regmap_config mt6370_regmap_config = {
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.reg_bits = 16,
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.val_bits = 8,
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.reg_format_endian = REGMAP_ENDIAN_BIG,
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.max_register = MT6370_REG_MAXADDR,
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};
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static int mt6370_probe(struct i2c_client *i2c)
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{
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struct mt6370_info *info;
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struct i2c_client *usbc_i2c;
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struct regmap *regmap;
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struct device *dev = &i2c->dev;
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int ret, vid;
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info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL);
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if (!info)
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return -ENOMEM;
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usbc_i2c = devm_i2c_new_dummy_device(dev, i2c->adapter,
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MT6370_USBC_I2CADDR);
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if (IS_ERR(usbc_i2c))
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return dev_err_probe(dev, PTR_ERR(usbc_i2c),
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"Failed to register USBC I2C client\n");
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/* Assign I2C client for PMU and TypeC */
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info->i2c[MT6370_PMU_I2C] = i2c;
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info->i2c[MT6370_USBC_I2C] = usbc_i2c;
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regmap = devm_regmap_init(dev, &mt6370_regmap_bus,
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info, &mt6370_regmap_config);
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if (IS_ERR(regmap))
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return dev_err_probe(dev, PTR_ERR(regmap),
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"Failed to init regmap\n");
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ret = mt6370_check_vendor_info(dev, regmap, &vid);
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if (ret)
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return dev_err_probe(dev, ret, "Failed to check vendor info\n");
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ret = devm_regmap_add_irq_chip(dev, regmap, i2c->irq,
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IRQF_ONESHOT, -1, &mt6370_irq_chip,
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&info->irq_data);
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if (ret)
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return dev_err_probe(dev, ret, "Failed to add irq chip\n");
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switch (vid) {
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case MT6370_VENID_MT6372P:
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case MT6370_VENID_MT6372CP:
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ret = devm_mfd_add_devices(dev, PLATFORM_DEVID_AUTO,
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mt6372_exclusive_devices,
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ARRAY_SIZE(mt6372_exclusive_devices),
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NULL, 0,
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regmap_irq_get_domain(info->irq_data));
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break;
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default:
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ret = devm_mfd_add_devices(dev, PLATFORM_DEVID_AUTO,
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mt6370_exclusive_devices,
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ARRAY_SIZE(mt6370_exclusive_devices),
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NULL, 0,
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regmap_irq_get_domain(info->irq_data));
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break;
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}
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if (ret)
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return dev_err_probe(dev, ret, "Failed to add the exclusive devices\n");
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return devm_mfd_add_devices(dev, PLATFORM_DEVID_AUTO,
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mt6370_devices, ARRAY_SIZE(mt6370_devices),
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NULL, 0,
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regmap_irq_get_domain(info->irq_data));
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}
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static const struct of_device_id mt6370_match_table[] = {
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{ .compatible = "mediatek,mt6370" },
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{}
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};
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MODULE_DEVICE_TABLE(of, mt6370_match_table);
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static struct i2c_driver mt6370_driver = {
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.driver = {
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.name = "mt6370",
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.of_match_table = mt6370_match_table,
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},
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.probe_new = mt6370_probe,
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};
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module_i2c_driver(mt6370_driver);
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MODULE_AUTHOR("ChiYuan Huang <cy_huang@richtek.com>");
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MODULE_DESCRIPTION("MediaTek MT6370 SubPMIC Driver");
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MODULE_LICENSE("GPL v2");
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99
drivers/mfd/mt6370.h
Normal file
99
drivers/mfd/mt6370.h
Normal file
@ -0,0 +1,99 @@
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/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) 2022 Richtek Technology Corp.
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*
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* Author: ChiYuan Huang <cy_huang@richtek.com>
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*/
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#ifndef __MFD_MT6370_H__
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#define __MFD_MT6370_H__
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/* IRQ definitions */
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#define MT6370_IRQ_DIRCHGON 0
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#define MT6370_IRQ_CHG_TREG 4
|
||||
#define MT6370_IRQ_CHG_AICR 5
|
||||
#define MT6370_IRQ_CHG_MIVR 6
|
||||
#define MT6370_IRQ_PWR_RDY 7
|
||||
#define MT6370_IRQ_FL_CHG_VINOVP 11
|
||||
#define MT6370_IRQ_CHG_VSYSUV 12
|
||||
#define MT6370_IRQ_CHG_VSYSOV 13
|
||||
#define MT6370_IRQ_CHG_VBATOV 14
|
||||
#define MT6370_IRQ_CHG_VINOVPCHG 15
|
||||
#define MT6370_IRQ_TS_BAT_COLD 20
|
||||
#define MT6370_IRQ_TS_BAT_COOL 21
|
||||
#define MT6370_IRQ_TS_BAT_WARM 22
|
||||
#define MT6370_IRQ_TS_BAT_HOT 23
|
||||
#define MT6370_IRQ_TS_STATC 24
|
||||
#define MT6370_IRQ_CHG_FAULT 25
|
||||
#define MT6370_IRQ_CHG_STATC 26
|
||||
#define MT6370_IRQ_CHG_TMR 27
|
||||
#define MT6370_IRQ_CHG_BATABS 28
|
||||
#define MT6370_IRQ_CHG_ADPBAD 29
|
||||
#define MT6370_IRQ_CHG_RVP 30
|
||||
#define MT6370_IRQ_TSHUTDOWN 31
|
||||
#define MT6370_IRQ_CHG_IINMEAS 32
|
||||
#define MT6370_IRQ_CHG_ICCMEAS 33
|
||||
#define MT6370_IRQ_CHGDET_DONE 34
|
||||
#define MT6370_IRQ_WDTMR 35
|
||||
#define MT6370_IRQ_SSFINISH 36
|
||||
#define MT6370_IRQ_CHG_RECHG 37
|
||||
#define MT6370_IRQ_CHG_TERM 38
|
||||
#define MT6370_IRQ_CHG_IEOC 39
|
||||
#define MT6370_IRQ_ADC_DONE 40
|
||||
#define MT6370_IRQ_PUMPX_DONE 41
|
||||
#define MT6370_IRQ_BST_BATUV 45
|
||||
#define MT6370_IRQ_BST_MIDOV 46
|
||||
#define MT6370_IRQ_BST_OLP 47
|
||||
#define MT6370_IRQ_ATTACH 48
|
||||
#define MT6370_IRQ_DETACH 49
|
||||
#define MT6370_IRQ_HVDCP_STPDONE 51
|
||||
#define MT6370_IRQ_HVDCP_VBUSDET_DONE 52
|
||||
#define MT6370_IRQ_HVDCP_DET 53
|
||||
#define MT6370_IRQ_CHGDET 54
|
||||
#define MT6370_IRQ_DCDT 55
|
||||
#define MT6370_IRQ_DIRCHG_VGOK 59
|
||||
#define MT6370_IRQ_DIRCHG_WDTMR 60
|
||||
#define MT6370_IRQ_DIRCHG_UC 61
|
||||
#define MT6370_IRQ_DIRCHG_OC 62
|
||||
#define MT6370_IRQ_DIRCHG_OV 63
|
||||
#define MT6370_IRQ_OVPCTRL_SWON 67
|
||||
#define MT6370_IRQ_OVPCTRL_UVP_D 68
|
||||
#define MT6370_IRQ_OVPCTRL_UVP 69
|
||||
#define MT6370_IRQ_OVPCTRL_OVP_D 70
|
||||
#define MT6370_IRQ_OVPCTRL_OVP 71
|
||||
#define MT6370_IRQ_FLED_STRBPIN 72
|
||||
#define MT6370_IRQ_FLED_TORPIN 73
|
||||
#define MT6370_IRQ_FLED_TX 74
|
||||
#define MT6370_IRQ_FLED_LVF 75
|
||||
#define MT6370_IRQ_FLED2_SHORT 78
|
||||
#define MT6370_IRQ_FLED1_SHORT 79
|
||||
#define MT6370_IRQ_FLED2_STRB 80
|
||||
#define MT6370_IRQ_FLED1_STRB 81
|
||||
#define mT6370_IRQ_FLED2_STRB_TO 82
|
||||
#define MT6370_IRQ_FLED1_STRB_TO 83
|
||||
#define MT6370_IRQ_FLED2_TOR 84
|
||||
#define MT6370_IRQ_FLED1_TOR 85
|
||||
#define MT6370_IRQ_OTP 93
|
||||
#define MT6370_IRQ_VDDA_OVP 94
|
||||
#define MT6370_IRQ_VDDA_UV 95
|
||||
#define MT6370_IRQ_LDO_OC 103
|
||||
#define MT6370_IRQ_BLED_OCP 118
|
||||
#define MT6370_IRQ_BLED_OVP 119
|
||||
#define MT6370_IRQ_DSV_VNEG_OCP 123
|
||||
#define MT6370_IRQ_DSV_VPOS_OCP 124
|
||||
#define MT6370_IRQ_DSV_BST_OCP 125
|
||||
#define MT6370_IRQ_DSV_VNEG_SCP 126
|
||||
#define MT6370_IRQ_DSV_VPOS_SCP 127
|
||||
|
||||
enum {
|
||||
MT6370_USBC_I2C = 0,
|
||||
MT6370_PMU_I2C,
|
||||
MT6370_MAX_I2C
|
||||
};
|
||||
|
||||
struct mt6370_info {
|
||||
struct i2c_client *i2c[MT6370_MAX_I2C];
|
||||
struct regmap_irq_chip_data *irq_data;
|
||||
};
|
||||
|
||||
#endif /* __MFD_MT6375_H__ */
|
||||
Loading…
Reference in New Issue
Block a user