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Message-Id: <20171201120651.29633-2-enric.balletbo@collabora.com>
Date: Fri, 1 Dec 2017 13:06:48 +0100
From: Enric Balletbo i Serra <enric.balletbo@...labora.com>
To: Lee Jones <lee.jones@...aro.org>,
Daniel Thompson <daniel.thompson@...aro.org>,
Jingoo Han <jingoohan1@...il.com>,
Rob Herring <robh+dt@...nel.org>, Pavel Machek <pavel@....cz>,
Heiko Stuebner <heiko@...ech.de>
Cc: Thierry Reding <thierry.reding@...il.com>,
Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
Richard Purdie <rpurdie@...ys.net>,
Jacek Anaszewski <jacek.anaszewski@...il.com>,
linux-pwm@...r.kernel.org, linux-fbdev@...r.kernel.org,
linux-kernel@...r.kernel.org, groeck@...omium.org,
linux-rockchip@...ts.infradead.org
Subject: [PATCH v5 2/5] dt-bindings: pwm-backlight: add PWM delay proprieties.
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 <enric.balletbo@...labora.com>
Acked-by: Pavel Machek <pavel@....cz>
---
Based on the original Huang Lin <hl@...k-chips.com> work.
Changes since v4:
- Rebase on top of mainline.
Changes since v3:
- Replace us for ms.
- Add Acked-by: Pavel Machek <pavel@....cz>
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
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