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authorDoug Brown <doug@schmorgal.com>2022-12-02 21:35:24 +0300
committerThierry Reding <thierry.reding@gmail.com>2022-12-06 14:46:15 +0300
commit8ba2725ffac351a1b80063ac7eb362832fae16a2 (patch)
treef3c5d14f710b086229b31882cc76531fb7256db5 /drivers/pwm/pwm-pxa.c
parent092c2ef4571cbc7e5f466bc241ff054723c41973 (diff)
downloadlinux-8ba2725ffac351a1b80063ac7eb362832fae16a2.tar.xz
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>
Diffstat (limited to 'drivers/pwm/pwm-pxa.c')
-rw-r--r--drivers/pwm/pwm-pxa.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/pwm/pwm-pxa.c b/drivers/pwm/pwm-pxa.c
index 00063ead7c0a..46ed668bd141 100644
--- a/drivers/pwm/pwm-pxa.c
+++ b/drivers/pwm/pwm-pxa.c
@@ -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>