diff options
| author | Uwe Kleine-König <u.kleine-koenig@baylibre.com> | 2025-07-30 10:02:20 +0200 |
|---|---|---|
| committer | Uwe Kleine-König <ukleinek@kernel.org> | 2025-09-15 11:39:44 +0200 |
| commit | a2f77ae4778d1eef2d273683ccc09fa971111c8c (patch) | |
| tree | 8fc29e06392755e10fd721e7fde8bf8f240efb56 /drivers/pwm/pwm-tiecap.c | |
| parent | e7c9b66b106989aeb17b167f5bbea9a108d26c0d (diff) | |
pwm: tiecap: Document behaviour of hardware disable
According to David Lechner[1] disabling a tiecap PWM makes the PWM pin
an input. The reported problem is fixed in commit deaeeda2051f
("backlight: pwm_bl: Don't rely on a disabled PWM emiting inactive
state"). Document the behaviour in the driver for future reference.
[1] https://lore.kernel.org/linux-pwm/39a472c0-ba24-de7b-8783-a16a71b172cd@lechnology.com
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@baylibre.com>
Reviewed-by: David Lechner <david@lechnology.com>
Link: https://lore.kernel.org/r/20250730080219.183181-2-u.kleine-koenig@baylibre.com
Signed-off-by: Uwe Kleine-König <ukleinek@kernel.org>
Diffstat (limited to 'drivers/pwm/pwm-tiecap.c')
| -rw-r--r-- | drivers/pwm/pwm-tiecap.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/pwm/pwm-tiecap.c b/drivers/pwm/pwm-tiecap.c index d91b2bdc88fc..67cc5e8bdb0e 100644 --- a/drivers/pwm/pwm-tiecap.c +++ b/drivers/pwm/pwm-tiecap.c @@ -3,6 +3,10 @@ * ECAP PWM driver * * Copyright (C) 2012 Texas Instruments, Inc. - https://www.ti.com/ + * + * Hardware properties: + * - On disable the PWM pin becomes an input, so the behaviour depends on + * external wiring. */ #include <linux/module.h> |