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linux/drivers/mfd/qcom-spmi-pmic.c
Jinjie Ruan 015d188002 mfd: qcom-spmi-pmic: Use for_each_child_of_node_scoped() 
Avoids the need for manual cleanup of_node_put() in early exits
from the loop.

Signed-off-by: Jinjie Ruan <ruanjinjie@huawei.com>
Link: https://lore.kernel.org/r/20240826092734.2899562-3-ruanjinjie@huawei.com
Signed-off-by: Lee Jones <lee@kernel.org>
2024-09-23 16:20:54 +01:00

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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2014, The Linux Foundation. All rights reserved.
*/
#include <linux/device.h>
#include <linux/errno.h>
#include <linux/gfp.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/of_platform.h>
#include <linux/spmi.h>
#include <linux/types.h>
#include <linux/regmap.h>
#include <soc/qcom/qcom-spmi-pmic.h>
#define PMIC_REV2 0x101
#define PMIC_REV3 0x102
#define PMIC_REV4 0x103
#define PMIC_TYPE 0x104
#define PMIC_SUBTYPE 0x105
#define PMIC_FAB_ID 0x1f2
#define PMIC_TYPE_VALUE 0x51
#define PMIC_REV4_V2 0x02
struct qcom_spmi_dev {
int num_usids;
struct qcom_spmi_pmic pmic;
};
static DEFINE_MUTEX(pmic_spmi_revid_lock);
#define N_USIDS(n) ((void *)n)
static const struct of_device_id pmic_spmi_id_table[] = {
{ .compatible = "qcom,pm660", .data = N_USIDS(2) },
{ .compatible = "qcom,pm660l", .data = N_USIDS(2) },
{ .compatible = "qcom,pm8004", .data = N_USIDS(2) },
{ .compatible = "qcom,pm8005", .data = N_USIDS(2) },
{ .compatible = "qcom,pm8019", .data = N_USIDS(2) },
{ .compatible = "qcom,pm8028", .data = N_USIDS(2) },
{ .compatible = "qcom,pm8110", .data = N_USIDS(2) },
{ .compatible = "qcom,pm8150", .data = N_USIDS(2) },
{ .compatible = "qcom,pm8150b", .data = N_USIDS(2) },
{ .compatible = "qcom,pm8150c", .data = N_USIDS(2) },
{ .compatible = "qcom,pm8150l", .data = N_USIDS(2) },
{ .compatible = "qcom,pm8226", .data = N_USIDS(2) },
{ .compatible = "qcom,pm8841", .data = N_USIDS(2) },
{ .compatible = "qcom,pm8901", .data = N_USIDS(2) },
{ .compatible = "qcom,pm8909", .data = N_USIDS(2) },
{ .compatible = "qcom,pm8916", .data = N_USIDS(2) },
{ .compatible = "qcom,pm8937", .data = N_USIDS(2) },
{ .compatible = "qcom,pm8941", .data = N_USIDS(2) },
{ .compatible = "qcom,pm8950", .data = N_USIDS(2) },
{ .compatible = "qcom,pm8994", .data = N_USIDS(2) },
{ .compatible = "qcom,pm8998", .data = N_USIDS(2) },
{ .compatible = "qcom,pma8084", .data = N_USIDS(2) },
{ .compatible = "qcom,pmd9635", .data = N_USIDS(2) },
{ .compatible = "qcom,pmi8950", .data = N_USIDS(2) },
{ .compatible = "qcom,pmi8962", .data = N_USIDS(2) },
{ .compatible = "qcom,pmi8994", .data = N_USIDS(2) },
{ .compatible = "qcom,pmi8998", .data = N_USIDS(2) },
{ .compatible = "qcom,pmk8002", .data = N_USIDS(2) },
{ .compatible = "qcom,pmp8074", .data = N_USIDS(2) },
{ .compatible = "qcom,smb2351", .data = N_USIDS(2) },
{ .compatible = "qcom,spmi-pmic", .data = N_USIDS(1) },
{ }
};
/*
* A PMIC can be represented by multiple SPMI devices, but
* only the base PMIC device will contain a reference to
* the revision information.
*
* This function takes a pointer to a pmic device and
* returns a pointer to the base PMIC device.
*
* This only supports PMICs with 1 or 2 USIDs.
*/
static struct spmi_device *qcom_pmic_get_base_usid(struct spmi_device *sdev, struct qcom_spmi_dev *ctx)
{
struct device_node *spmi_bus;
int function_parent_usid, ret;
u32 pmic_addr;
/*
* Quick return if the function device is already in the base
* USID. This will always be hit for PMICs with only 1 USID.
*/
if (sdev->usid % ctx->num_usids == 0) {
get_device(&sdev->dev);
return sdev;
}
function_parent_usid = sdev->usid;
/*
* Walk through the list of PMICs until we find the sibling USID.
* The goal is to find the first USID which is less than the
* number of USIDs in the PMIC array, e.g. for a PMIC with 2 USIDs
* where the function device is under USID 3, we want to find the
* device for USID 2.
*/
spmi_bus = of_get_parent(sdev->dev.of_node);
sdev = ERR_PTR(-ENODATA);
for_each_child_of_node_scoped(spmi_bus, child) {
ret = of_property_read_u32_index(child, "reg", 0, &pmic_addr);
if (ret) {
sdev = ERR_PTR(ret);
break;
}
if (pmic_addr == function_parent_usid - (ctx->num_usids - 1)) {
sdev = spmi_find_device_by_of_node(child);
if (!sdev) {
/*
* If the base USID for this PMIC hasn't been
* registered yet then we need to defer.
*/
sdev = ERR_PTR(-EPROBE_DEFER);
}
break;
}
}
of_node_put(spmi_bus);
return sdev;
}
static int pmic_spmi_get_base_revid(struct spmi_device *sdev, struct qcom_spmi_dev *ctx)
{
struct qcom_spmi_dev *base_ctx;
struct spmi_device *base;
int ret = 0;
base = qcom_pmic_get_base_usid(sdev, ctx);
if (IS_ERR(base))
return PTR_ERR(base);
/*
* Copy revid info from base device if it has probed and is still
* bound to its driver.
*/
mutex_lock(&pmic_spmi_revid_lock);
base_ctx = spmi_device_get_drvdata(base);
if (!base_ctx) {
ret = -EPROBE_DEFER;
goto out_unlock;
}
memcpy(&ctx->pmic, &base_ctx->pmic, sizeof(ctx->pmic));
out_unlock:
mutex_unlock(&pmic_spmi_revid_lock);
put_device(&base->dev);
return ret;
}
static int pmic_spmi_load_revid(struct regmap *map, struct device *dev,
struct qcom_spmi_pmic *pmic)
{
int ret;
ret = regmap_read(map, PMIC_TYPE, &pmic->type);
if (ret < 0)
return ret;
if (pmic->type != PMIC_TYPE_VALUE)
return ret;
ret = regmap_read(map, PMIC_SUBTYPE, &pmic->subtype);
if (ret < 0)
return ret;
pmic->name = of_match_device(pmic_spmi_id_table, dev)->compatible;
ret = regmap_read(map, PMIC_REV2, &pmic->rev2);
if (ret < 0)
return ret;
ret = regmap_read(map, PMIC_REV3, &pmic->minor);
if (ret < 0)
return ret;
ret = regmap_read(map, PMIC_REV4, &pmic->major);
if (ret < 0)
return ret;
if (pmic->subtype == PMI8998_SUBTYPE || pmic->subtype == PM660_SUBTYPE) {
ret = regmap_read(map, PMIC_FAB_ID, &pmic->fab_id);
if (ret < 0)
return ret;
}
/*
* In early versions of PM8941 and PM8226, the major revision number
* started incrementing from 0 (eg 0 = v1.0, 1 = v2.0).
* Increment the major revision number here if the chip is an early
* version of PM8941 or PM8226.
*/
if ((pmic->subtype == PM8941_SUBTYPE || pmic->subtype == PM8226_SUBTYPE) &&
pmic->major < PMIC_REV4_V2)
pmic->major++;
if (pmic->subtype == PM8110_SUBTYPE)
pmic->minor = pmic->rev2;
dev_dbg(dev, "%x: %s v%d.%d\n",
pmic->subtype, pmic->name, pmic->major, pmic->minor);
return 0;
}
/**
* qcom_pmic_get() - Get a pointer to the base PMIC device
*
* This function takes a struct device for a driver which is a child of a PMIC.
* And locates the PMIC revision information for it.
*
* @dev: the pmic function device
* @return: the struct qcom_spmi_pmic* pointer associated with the function device
*/
const struct qcom_spmi_pmic *qcom_pmic_get(struct device *dev)
{
struct spmi_device *sdev;
struct qcom_spmi_dev *spmi;
/*
* Make sure the device is actually a child of a PMIC
*/
if (!of_match_device(pmic_spmi_id_table, dev->parent))
return ERR_PTR(-EINVAL);
sdev = to_spmi_device(dev->parent);
spmi = dev_get_drvdata(&sdev->dev);
return &spmi->pmic;
}
EXPORT_SYMBOL_GPL(qcom_pmic_get);
static const struct regmap_config spmi_regmap_config = {
.reg_bits = 16,
.val_bits = 8,
.max_register = 0xffff,
.fast_io = true,
};
static int pmic_spmi_probe(struct spmi_device *sdev)
{
struct regmap *regmap;
struct qcom_spmi_dev *ctx;
int ret;
regmap = devm_regmap_init_spmi_ext(sdev, &spmi_regmap_config);
if (IS_ERR(regmap))
return PTR_ERR(regmap);
ctx = devm_kzalloc(&sdev->dev, sizeof(*ctx), GFP_KERNEL);
if (!ctx)
return -ENOMEM;
ctx->num_usids = (uintptr_t)device_get_match_data(&sdev->dev);
/* Only the first slave id for a PMIC contains this information */
if (sdev->usid % ctx->num_usids == 0) {
ret = pmic_spmi_load_revid(regmap, &sdev->dev, &ctx->pmic);
if (ret < 0)
return ret;
} else {
ret = pmic_spmi_get_base_revid(sdev, ctx);
if (ret)
return ret;
}
mutex_lock(&pmic_spmi_revid_lock);
spmi_device_set_drvdata(sdev, ctx);
mutex_unlock(&pmic_spmi_revid_lock);
return devm_of_platform_populate(&sdev->dev);
}
static void pmic_spmi_remove(struct spmi_device *sdev)
{
mutex_lock(&pmic_spmi_revid_lock);
spmi_device_set_drvdata(sdev, NULL);
mutex_unlock(&pmic_spmi_revid_lock);
}
MODULE_DEVICE_TABLE(of, pmic_spmi_id_table);
static struct spmi_driver pmic_spmi_driver = {
.probe = pmic_spmi_probe,
.remove = pmic_spmi_remove,
.driver = {
.name = "pmic-spmi",
.of_match_table = pmic_spmi_id_table,
},
};
module_spmi_driver(pmic_spmi_driver);
MODULE_DESCRIPTION("Qualcomm SPMI PMIC driver");
MODULE_ALIAS("spmi:spmi-pmic");
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Josh Cartwright <joshc@codeaurora.org>");
MODULE_AUTHOR("Stanimir Varbanov <svarbanov@mm-sol.com>");
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