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| author | Uwe Kleine-König <u.kleine-koenig@pengutronix.de> | 2019-07-30 14:32:29 +0200 |
|---|---|---|
| committer | Thierry Reding <thierry.reding@gmail.com> | 2019-09-21 00:55:33 +0200 |
| commit | 3b442c60cf9766c76bc3c1e44e3e387853074a08 (patch) | |
| tree | 03bc88aae1a0ca699510d24e9d7611119586ebea /drivers/pwm/pwm-jz4740.c | |
| parent | f6abac0379b8368519f28016c8c8821b8bd17f5e (diff) | |
| download | linux-3b442c60cf9766c76bc3c1e44e3e387853074a08.tar.bz2 | |
pwm: jz4740: Document known limitations
The JZ4740 PWM implementation doesn't fulfill the (up to now
insufficiently documented) requirements of the PWM API. At least
document them in the driver.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Reviewed-by: Paul Cercueil <paul@crapouillou.net>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
Diffstat (limited to 'drivers/pwm/pwm-jz4740.c')
| -rw-r--r-- | drivers/pwm/pwm-jz4740.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/pwm/pwm-jz4740.c b/drivers/pwm/pwm-jz4740.c index f901e8a0d33d..9d444d012f92 100644 --- a/drivers/pwm/pwm-jz4740.c +++ b/drivers/pwm/pwm-jz4740.c @@ -2,6 +2,11 @@ /* * Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de> * JZ4740 platform PWM support + * + * Limitations: + * - The .apply callback doesn't complete the currently running period before + * reconfiguring the hardware. + * - Each period starts with the inactive part. */ #include <linux/clk.h> |