diff options
| author | Richard Genoud <richard.genoud@gmail.com> | 2017-06-01 14:18:26 +0200 |
|---|---|---|
| committer | Linus Walleij <linus.walleij@linaro.org> | 2017-06-09 09:38:27 +0200 |
| commit | fc7a90686777e7d2da7a08cf0202c21f3b96febb (patch) | |
| tree | 3da8fd5d68eb64b67e583c2c936ce87db82abe5d | |
| parent | c528eb27a3be2600e724c8a57cb69eab1fd9afa2 (diff) | |
| download | linux-fc7a90686777e7d2da7a08cf0202c21f3b96febb.tar.bz2 | |
gpio: mvebu: fix gpio bank registration when pwm is used
If more than one gpio bank has the "pwm" property, only one will be
registered successfully, all the others will fail with:
mvebu-gpio: probe of f1018140.gpio failed with error -17
That's because in alloc_pwms(), the chip->base (aka "int pwm"), was not
set (thus, ==0) ; and 0 is a meaningful start value in alloc_pwm().
What was intended is mvpwm->chip->base = -1.
Like that, the numbering will be done auto-magically
Moreover, as the region might be already occupied by another pwm, we
shouldn't force:
mvpwm->chip->base = 0
nor
mvpwm->chip->base = id * MVEBU_MAX_GPIO_PER_BANK;
Tested on clearfog-pro (Marvell 88F6828)
Fixes: 757642f9a584 ("gpio: mvebu: Add limited PWM support")
Signed-off-by: Richard Genoud <richard.genoud@gmail.com>
Reviewed-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
| -rw-r--r-- | drivers/gpio/gpio-mvebu.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/gpio/gpio-mvebu.c b/drivers/gpio/gpio-mvebu.c index cdef2c78cb3b..5104b6398139 100644 --- a/drivers/gpio/gpio-mvebu.c +++ b/drivers/gpio/gpio-mvebu.c @@ -768,6 +768,13 @@ static int mvebu_pwm_probe(struct platform_device *pdev, mvpwm->chip.dev = dev; mvpwm->chip.ops = &mvebu_pwm_ops; mvpwm->chip.npwm = mvchip->chip.ngpio; + /* + * There may already be some PWM allocated, so we can't force + * mvpwm->chip.base to a fixed point like mvchip->chip.base. + * So, we let pwmchip_add() do the numbering and take the next free + * region. + */ + mvpwm->chip.base = -1; spin_lock_init(&mvpwm->lock); |