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pwm: pxa: Add reference manual link and limitations 

Add a pointer to the location of reference manuals for some of the
supported chips, and add a limitations section explaining the hardware's
PWM disable behavior.

Suggested-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Doug Brown <doug@schmorgal.com>
Reviewed-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Link: https://lore.kernel.org/r/20221113233639.24244-6-doug@schmorgal.com
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
This commit is contained in:
Doug Brown 2022-12-02 19:35:24 +01:00 committed by Thierry Reding
parent 092c2ef457
commit 8ba2725ffa
1 changed files with 7 additions and 0 deletions
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7
drivers/pwm/pwm-pxa.c
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@ -6,6 +6,13 @@
*
* 2008-02-13 initial version
* eric miao <eric.miao@marvell.com>
*
* Links to reference manuals for some of the supported PWM chips can be found
* in Documentation/arm/marvell.rst.
*
* Limitations:
* - When PWM is stopped, the current PWM period stops abruptly at the next
* input clock (PWMCR_SD is set) and the output is driven to inactive.
*/
#include <linux/module.h>