linux-kernel - [PATCH v2 1/4] dt-bindings: pwm-backlight: add pwm-delay-us property

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Message-Id: <20170630112109.13785-1-enric.balletbo@collabora.com>
Date:   Fri, 30 Jun 2017 13:21:06 +0200
From:   Enric Balletbo i Serra <enric.balletbo@...labora.com>
To:     Thierry Reding <thierry.reding@...il.com>,
        Lee Jones <lee.jones@...aro.org>,
        Daniel Thompson <daniel.thompson@...aro.org>,
        Jingoo Han <jingoohan1@...il.com>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Rob Herring <robh+dt@...nel.org>, Pavel Machek <pavel@....cz>,
        Richard Purdie <rpurdie@...ys.net>,
        Jacek Anaszewski <jacek.anaszewski@...il.com>,
        Heiko Stuebner <heiko@...ech.de>
Cc:     linux-pwm@...r.kernel.org, linux-fbdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, groeck@...omium.org,
        linux-rockchip@...ts.infradead.org, huang lin <hl@...k-chips.com>
Subject: [PATCH v2 1/4] dt-bindings: pwm-backlight: add pwm-delay-us property

From: huang lin <hl@...k-chips.com>

Add a pwm-delay-us property to specify the delay between setting an
initial (non-zero) PWM value and enabling the backlight, and also the
delay between disabling the backlight and setting PWM value to 0.

Signed-off-by: huang lin <hl@...k-chips.com>
Signed-off-by: Enric Balletbo i Serra <enric.balletbo@...labora.com>
---
Changes since v1:
 - As suggested by Daniel Thompson
   - Do not assume power-on delay and power-off delay will be the same

v1: https://lkml.org/lkml/2017/6/28/219

 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..49b037e 100644
--- a/Documentation/devicetree/bindings/leds/backlight/pwm-backlight.txt
+++ b/Documentation/devicetree/bindings/leds/backlight/pwm-backlight.txt
@@ -17,6 +17,11 @@ 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])
+  - pwm-delay-us: delay between setting an initial (non-zero) PWM value and
+                  enabling the backlight, and also the delay between disabling
+                  the backlight and setting PWM value to 0.
+                  The 1st cell is the pre-delay in micro seconds.
+                  The 2nd cell is the post-delay in micro seconds.
 
 [0]: Documentation/devicetree/bindings/pwm/pwm.txt
 [1]: Documentation/devicetree/bindings/gpio/gpio.txt
@@ -32,4 +37,5 @@ Example:
 
 		power-supply = <&vdd_bl_reg>;
 		enable-gpios = <&gpio 58 0>;
+		pwm-delay-us = <10000 10000>;
 	};
-- 
2.9.3