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pwm: tiecap: Document behaviour of hardware disable

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According to David Lechner[1] disabling a tiecap PWM makes the PWM pin
an input. The reported problem is fixed in commit deaeeda205
("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>
This commit is contained in:
Uwe Kleine-König
2025-07-30 10:02:20 +02:00
committed by Uwe Kleine-König
parent e7c9b66b10
commit a2f77ae477
1 changed files with 4 additions and 0 deletions
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4
drivers/pwm/pwm-tiecap.c
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@@ -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>