From mboxrd@z Thu Jan 1 00:00:00 1970 From: jhovold@gmail.com (Johan Hovold) Date: Tue, 22 Oct 2013 18:32:39 +0200 Subject: [PATCH 1/2] misc: atmel_pwm: add deferred-probing support In-Reply-To: <1382459560-26596-1-git-send-email-jhovold@gmail.com> References: <1382459560-26596-1-git-send-email-jhovold@gmail.com> Message-ID: <1382459560-26596-2-git-send-email-jhovold@gmail.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Two drivers (atmel-pwm-bl and leds-atmel-pwm) currently depend on the atmel_pwm driver to have bound to any pwm-device before their devices are probed. Support deferred probing of such devices by making sure to return -EPROBE_DEFER from pwm_channel_alloc when no pwm-device has yet been bound. Signed-off-by: Johan Hovold --- drivers/misc/atmel_pwm.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/drivers/misc/atmel_pwm.c b/drivers/misc/atmel_pwm.c index 494d050..a6dc56e 100644 --- a/drivers/misc/atmel_pwm.c +++ b/drivers/misc/atmel_pwm.c @@ -90,8 +90,10 @@ int pwm_channel_alloc(int index, struct pwm_channel *ch) unsigned long flags; int status = 0; - /* insist on PWM init, with this signal pinned out */ - if (!pwm || !(pwm->mask & 1 << index)) + if (!pwm) + return -EPROBE_DEFER; + + if (!(pwm->mask & 1 << index)) return -ENODEV; if (index < 0 || index >= PWM_NCHAN || !ch) -- 1.8.4