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Groups > linux.kernel > #1689502
| From | Enric Balletbo i Serra <enric.balletbo@collabora.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [PATCH v3 2/5] dt-bindings: pwm-backlight: add PWM delay proprieties. |
| Date | 2017-07-17 23:30 +0200 |
| Message-ID | <u4lKy-1Tb-29@gated-at.bofh.it> (permalink) |
| References | <u4lKx-1Tb-3@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
Hardware needs a delay between setting an initial (non-zero) PWM and
enabling the backlight using GPIO. The post-pwm-on-delay-us specifies
this delay in micro seconds. Hardware also needs a delay between disabing
the backlight using GPIO and setting PWM value to 0. The pwm-off-delay-us
is this delay in micro seconds.
Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
---
Based on the original Huang Lin <hl@rock-chips.com> work.
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..810527c 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-us: Delay in us between setting an initial (non-zero) PWM
+ and enabling the backlight using GPIO.
+ - pwm-off-delay-us: Delay in us 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-us = <10000>;
+ pwm-off-delay-us = <10000>;
};
--
2.9.3
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[PATCH v3 1/5] pwm-backlight: enable/disable the PWM before/after LCD enable toggle. Enric Balletbo i Serra <enric.balletbo@collabora.com> - 2017-07-17 23:30 +0200
[PATCH v3 3/5] pwm-backlight: add support for PWM delays proprieties. Enric Balletbo i Serra <enric.balletbo@collabora.com> - 2017-07-17 23:30 +0200
Re: [PATCH v3 3/5] pwm-backlight: add support for PWM delays proprieties. Daniel Thompson <daniel.thompson@linaro.org> - 2017-07-18 11:40 +0200
Re: [PATCH v3 3/5] pwm-backlight: add support for PWM delays proprieties. Pavel Machek <pavel@ucw.cz> - 2017-07-20 10:10 +0200
Re: [PATCH v3 3/5] pwm-backlight: add support for PWM delays proprieties. Daniel Thompson <daniel.thompson@linaro.org> - 2017-07-20 12:40 +0200
Re: [PATCH v3 3/5] pwm-backlight: add support for PWM delays proprieties. Pavel Machek <pavel@ucw.cz> - 2017-07-20 13:10 +0200
[PATCH v3 4/5] ARM: dts: rockchip: set PWM delay backlight settings for Veyron. Enric Balletbo i Serra <enric.balletbo@collabora.com> - 2017-07-17 23:30 +0200
[PATCH v3 2/5] dt-bindings: pwm-backlight: add PWM delay proprieties. Enric Balletbo i Serra <enric.balletbo@collabora.com> - 2017-07-17 23:30 +0200
Re: [PATCH v3 2/5] dt-bindings: pwm-backlight: add PWM delay proprieties. Pavel Machek <pavel@ucw.cz> - 2017-07-20 10:10 +0200
Re: [PATCH v3 1/5] pwm-backlight: enable/disable the PWM before/after LCD enable toggle. Daniel Thompson <daniel.thompson@linaro.org> - 2017-07-18 11:40 +0200
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