From mboxrd@z Thu Jan 1 00:00:00 1970 From: Enric Balletbo i Serra Date: Fri, 01 Dec 2017 12:06:48 +0000 Subject: [PATCH v5 2/5] dt-bindings: pwm-backlight: add PWM delay proprieties. Message-Id: <20171201120651.29633-2-enric.balletbo@collabora.com> List-Id: References: <20171201120651.29633-1-enric.balletbo@collabora.com> In-Reply-To: <20171201120651.29633-1-enric.balletbo-ZGY8ohtN/8qB+jHODAdFcQ@public.gmane.org> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: Lee Jones , Daniel Thompson , Jingoo Han , Rob Herring , Pavel Machek , Heiko Stuebner Cc: linux-pwm-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-fbdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Bartlomiej Zolnierkiewicz , linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-rockchip-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, Thierry Reding , Richard Purdie , Jacek Anaszewski , groeck-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org Hardware needs a delay between setting an initial (non-zero) PWM and enabling the backlight using GPIO. The post-pwm-on-delay-ms specifies this delay in milli seconds. Hardware also needs a delay between disabing the backlight using GPIO and setting PWM value to 0. The pwm-off-delay-ms is this delay in milli seconds. Signed-off-by: Enric Balletbo i Serra Acked-by: Pavel Machek --- Based on the original Huang Lin work. Changes since v4: - Rebase on top of mainline. Changes since v3: - Replace us for ms. - Add Acked-by: Pavel Machek Changes since v2: - Use separate properties (Rob Herring) Changes since v1: - As suggested by Daniel Thompson - Do not assume power-on delay and power-off delay will be the same Documentation/devicetree/bindings/leds/backlight/pwm-backlight.txt | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/Documentation/devicetree/bindings/leds/backlight/pwm-backlight.txt b/Documentation/devicetree/bindings/leds/backlight/pwm-backlight.txt index 764db86..3108109 100644 --- a/Documentation/devicetree/bindings/leds/backlight/pwm-backlight.txt +++ b/Documentation/devicetree/bindings/leds/backlight/pwm-backlight.txt @@ -17,6 +17,10 @@ Optional properties: "pwms" property (see PWM binding[0]) - enable-gpios: contains a single GPIO specifier for the GPIO which enables and disables the backlight (see GPIO binding[1]) + - post-pwm-on-delay-ms: Delay in ms between setting an initial (non-zero) PWM + and enabling the backlight using GPIO. + - pwm-off-delay-ms: Delay in ms between disabling the backlight using GPIO + and setting PWM value to 0. [0]: Documentation/devicetree/bindings/pwm/pwm.txt [1]: Documentation/devicetree/bindings/gpio/gpio.txt @@ -32,4 +36,6 @@ Example: power-supply = <&vdd_bl_reg>; enable-gpios = <&gpio 58 0>; + post-pwm-on-delay-ms = <10>; + pwm-off-delay-ms = <10>; }; -- 2.9.3