From mboxrd@z Thu Jan 1 00:00:00 1970 From: Enric Balletbo i Serra Subject: [RESEND PATCH v3 4/4] dt-bindings: pwm-backlight: move brightness-levels to optional. Date: Mon, 9 Apr 2018 10:33:33 +0200 Message-ID: <20180409083333.1249-5-enric.balletbo@collabora.com> References: <20180409083333.1249-1-enric.balletbo@collabora.com> Return-path: In-Reply-To: <20180409083333.1249-1-enric.balletbo@collabora.com> Sender: linux-kernel-owner@vger.kernel.org To: Daniel Thompson , Doug Anderson , Pavel Machek , Rob Herring , Lee Jones Cc: Jingoo Han , Richard Purdie , Jacek Anaszewski , Brian Norris , Guenter Roeck , Alexandru Stan , linux-leds@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, kernel@collabora.com List-Id: devicetree@vger.kernel.org The patch 'backlight: pwm_bl: compute brightness of LED linearly to human eye' introduced a default brightness-levels table that is used when brightness-levels is not available in the dts. So move brightness-levels and default-brightness-level to be optional. Signed-off-by: Enric Balletbo i Serra Reviewed-by: Rob Herring Acked-by: Daniel Thompson --- .../devicetree/bindings/leds/backlight/pwm-backlight.txt | 15 ++++++++------- 1 file changed, 8 insertions(+), 7 deletions(-) diff --git a/Documentation/devicetree/bindings/leds/backlight/pwm-backlight.txt b/Documentation/devicetree/bindings/leds/backlight/pwm-backlight.txt index ce9b5746b774..64fa2fbd98c9 100644 --- a/Documentation/devicetree/bindings/leds/backlight/pwm-backlight.txt +++ b/Documentation/devicetree/bindings/leds/backlight/pwm-backlight.txt @@ -3,13 +3,6 @@ pwm-backlight bindings Required properties: - compatible: "pwm-backlight" - pwms: OF device-tree PWM specification (see PWM binding[0]) - - brightness-levels: Array of distinct brightness levels. Typically these - are in the range from 0 to 255, but any range starting at 0 will do. - The actual brightness level (PWM duty cycle) will be interpolated - from these values. 0 means a 0% duty cycle (darkest/off), while the - last value in the array represents a 100% duty cycle (brightest). - - default-brightness-level: the default brightness level (index into the - array defined by the "brightness-levels" property) - power-supply: regulator for supply voltage Optional properties: @@ -21,6 +14,14 @@ Optional properties: 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. + - brightness-levels: Array of distinct brightness levels. Typically these + are in the range from 0 to 255, but any range starting at + 0 will do. The actual brightness level (PWM duty cycle) + will be interpolated from these values. 0 means a 0% duty + cycle (darkest/off), while the last value in the array + represents a 100% duty cycle (brightest). + - default-brightness-level: The default brightness level (index into the + array defined by the "brightness-levels" property). - num-interpolated-steps: Number of interpolated steps between each value of brightness-levels table. This way a high resolution pwm duty cycle can be used without -- 2.16.3