af0ba001d2
In some platforms (like am33xx), PWM sub modules (ECAP, EHRPWM, EQEP) are integrated to PWM subsystem. These PWM submodules has resources shared and only one register bit-field is provided to control module/clock enable/disable, makes it difficult to handle common resources from independent PWMSS submodule drivers. So the solution here implemented in this patch is, to create driver for PWMSS and take the role of parent driver for PWM submodules. PWMSS parent driver enumerates all the child nodes under PWMSS module. Also symbol "pwmss_submodule_state_change" exported to enable clock gating for individual PWMSS submodules, and submodule drivers has to enable clock gating from their drivers. As this is only supported during DT boot, the parent/child relationship is created and populated in DT execution flow. The only required change is inside DTS file, making EHRPWM & ECAP as a child to PWMSS node. Signed-off-by: Philip, Avinash <avinashphilip@ti.com> Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
40 lines
1.1 KiB
C
40 lines
1.1 KiB
C
/*
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* TI PWM Subsystem driver
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*
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* Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com/
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#ifndef __TIPWMSS_H
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#define __TIPWMSS_H
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#ifdef CONFIG_PWM_TIPWMSS
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/* PWM substem clock gating */
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#define PWMSS_ECAPCLK_EN BIT(0)
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#define PWMSS_ECAPCLK_STOP_REQ BIT(1)
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#define PWMSS_EPWMCLK_EN BIT(8)
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#define PWMSS_EPWMCLK_STOP_REQ BIT(9)
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#define PWMSS_ECAPCLK_EN_ACK BIT(0)
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#define PWMSS_EPWMCLK_EN_ACK BIT(8)
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extern u16 pwmss_submodule_state_change(struct device *dev, int set);
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#else
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static inline u16 pwmss_submodule_state_change(struct device *dev, int set)
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{
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/* return success status value */
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return 0xFFFF;
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}
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#endif
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#endif /* __TIPWMSS_H */
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