From mboxrd@z Thu Jan 1 00:00:00 1970 From: thierry.reding@gmail.com (Thierry Reding) Date: Tue, 1 Oct 2013 22:43:35 +0200 Subject: [PATCH 05/10] ARM: SAMSUNG: Initialize PWM backlight enable_gpio field In-Reply-To: <524B14E8.5040302@wwwdotorg.org> References: <1379972467-11243-1-git-send-email-treding@nvidia.com> <1379972467-11243-6-git-send-email-treding@nvidia.com> <524B14E8.5040302@wwwdotorg.org> Message-ID: <20131001204335.GB9201@ulmo.nvidia.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Tue, Oct 01, 2013 at 12:31:04PM -0600, Stephen Warren wrote: > On 09/23/2013 03:41 PM, Thierry Reding wrote: > > The GPIO API defines 0 as being a valid GPIO number, so this field needs > > to be initialized explicitly. > > > static void __init smdkv210_map_io(void) > > > @@ -70,6 +70,7 @@ static struct samsung_bl_drvdata samsung_dfl_bl_data __initdata = { > > .max_brightness = 255, > > .dft_brightness = 255, > > .pwm_period_ns = 78770, > > + .enable_gpio = -1, > > .init = samsung_bl_init, > > .exit = samsung_bl_exit, > > }, > > @@ -121,6 +122,10 @@ void __init samsung_bl_set(struct samsung_bl_gpio_info *gpio_info, > > samsung_bl_data->lth_brightness = bl_data->lth_brightness; > > if (bl_data->pwm_period_ns) > > samsung_bl_data->pwm_period_ns = bl_data->pwm_period_ns; > > + if (bl_data->enable_gpio) > > + samsung_bl_data->enable_gpio = bl_data->enable_gpio; > > + if (bl_data->enable_gpio_flags) > > + samsung_bl_data->enable_gpio_flags = bl_data->enable_gpio_flags; > > Won't this cause the core pwm_bl driver to request/manipulate the GPIO, > whereas this driver already does that inside the samsung_bl_init/exit > callbacks? I think you either need to adjust those callbacks, or not set > the new standard GPIO property in samsung_bl_data. I don't think so. The samsung_bl_data is a copy of samsung_dfl_bl_data augmented by board-specific settings. So in fact copying these values here is essential to allow boards to override the enable_gpio and flags fields. Currently no board sets the enable_gpio to a valid GPIO so it's all still handled by the callbacks only. Thierry -------------- next part -------------- A non-text attachment was scrubbed... Name: not available Type: application/pgp-signature Size: 836 bytes Desc: not available URL: