From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stephen Warren Date: Tue, 01 Oct 2013 18:31:04 +0000 Subject: Re: [PATCH 05/10] ARM: SAMSUNG: Initialize PWM backlight enable_gpio field Message-Id: <524B14E8.5040302@wwwdotorg.org> List-Id: References: <1379972467-11243-1-git-send-email-treding@nvidia.com> <1379972467-11243-6-git-send-email-treding@nvidia.com> In-Reply-To: <1379972467-11243-6-git-send-email-treding@nvidia.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: linux-arm-kernel@lists.infradead.org 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.