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pwm: Autodetect default value for of_pwm_n_cells from device tree

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This allows to simplify all drivers that use three pwm-cells.
The only ugly side effect is that if a driver specified of_pwm_n_cells = 2
it suddenly supports device trees that use #pwm-cells = <3>. This however
isn't a bad thing because the driver doesn't need explicit support for
three cells as the core handles all the details. Also there is no such
in-tree driver.

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:
Uwe Kleine-König 2021-05-10 16:06:39 +02:00 committed by Thierry Reding
parent 5447e78336
commit 69230cfac3
1 changed files with 7 additions and 1 deletions
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8
drivers/pwm/core.c
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@ -158,8 +158,14 @@ static void of_pwmchip_add(struct pwm_chip *chip)
return; return;
if (!chip->of_xlate) { if (!chip->of_xlate) {
u32 pwm_cells;
if (of_property_read_u32(chip->dev->of_node, "#pwm-cells",
&pwm_cells))
pwm_cells = 2;
chip->of_xlate = of_pwm_xlate_with_flags; chip->of_xlate = of_pwm_xlate_with_flags;
chip->of_pwm_n_cells = 2; chip->of_pwm_n_cells = pwm_cells;
} }
of_node_get(chip->dev->of_node); of_node_get(chip->dev->of_node);