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pwm: Add new pwm-samsung driver

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This patch introduces new Samsung PWM driver, which is completely
rewritten to be multiplatform- and DeviceTree-aware.

In addition, remaining problems of old driver are fixed, such as:
 - proper handling of hardware variants,
 - synchronization on SMP systems,
 - handling of boundary parameter values,
 - hardware sharing with PWM clocksource driver,
 - undefined state of PWM output after stopping PWM channel.

Signed-off-by: Tomasz Figa <tomasz.figa@gmail.com>
Reviewed-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Tested-by: Heiko Stuebner <heiko@sntech.de>
Tested-by: Mark Brown <broonie@linaro.org>
Tested-by: Sylwester Nawrocki <sylvester.nawrocki@gmail.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Thierry Reding <thierry.reding@gmail.com>
This commit is contained in:
Tomasz Figa 2013-04-06 02:40:36 +02:00
parent 615c19e160
commit 11ad39ede2
3 changed files with 626 additions and 0 deletions
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7
include/clocksource/samsung_pwm.h
View file

@ -20,7 +20,14 @@
#define SAMSUNG_PWM_NUM 5
/*
* Following declaration must be in an ifdef due to this symbol being static
* in pwm-samsung driver if the clocksource driver is not compiled in and the
* spinlock is not shared between both drivers.
*/
#ifdef CONFIG_CLKSRC_SAMSUNG_PWM
extern spinlock_t samsung_pwm_lock;
#endif
struct samsung_pwm_variant {
u8 bits;