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authorUwe Kleine-König <u.kleine-koenig@pengutronix.de>2021-05-10 17:06:39 +0300
committerThierry Reding <thierry.reding@gmail.com>2021-05-25 19:18:25 +0300
commit69230cfac3d02c1b8d78aa7bdb29a1710147d49b (patch)
tree942a8aa1913822a1c78ea7c9502f8af1c9f39eb1 /drivers
parent5447e7833629ee4208b7d41862ab0249d6b50077 (diff)
downloadlinux-69230cfac3d02c1b8d78aa7bdb29a1710147d49b.tar.xz
pwm: Autodetect default value for of_pwm_n_cells from device tree
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>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/pwm/core.c8
1 files changed, 7 insertions, 1 deletions
diff --git a/drivers/pwm/core.c b/drivers/pwm/core.c
index 821ee1959816..c165c5822703 100644
--- a/drivers/pwm/core.c
+++ b/drivers/pwm/core.c
@@ -158,8 +158,14 @@ static void of_pwmchip_add(struct pwm_chip *chip)
return;
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_pwm_n_cells = 2;
+ chip->of_pwm_n_cells = pwm_cells;
}
of_node_get(chip->dev->of_node);