| Message ID | 20220722102407.2205-6-peterwu.pub@gmail.com (mailing list archive) |
|---|---|
| State | Superseded |
| Headers | show |
| Series | Add MediaTek MT6370 PMIC support | expand |
On Fri, Jul 22, 2022 at 6:24 PM ChiaEn Wu <peterwu.pub@gmail.com> wrote: > > Signed-off-by: ChiYuan Huang <cy_huang@richtek.com> > Reviewed-by: Rob Herring <robh@kernel.org> > --- [snip] > + compatible: > + const: mediatek,mt6370-backlight > + > + default-brightness: > + minimum: 0 > + maximum: 2048 > + > + max-brightness: > + minimum: 0 > + maximum: 2048 > + Hi Rob, Krzysztof, First, I'm so sorry for our SoB writing wrong, I'll fix it in the next patch. Because of this mail thread (https://lore.kernel.org/all/20220728113109.7gf3b36mqjxlhcq3@maple.lan/), I would like to discuss with you that I may change the following in this DT document, I am not sure whether you agree or not. 1. Add some descriptions about MT6372, which supports 16384 steps (14 bits) and is different from MT6370/MT6371 (2048 steps, 11 bits) 2. Modify the format of 'compatible' as follows to distinguish between MT6370/MT6371 or MT6372 ------------------------------------------ properties: compatible: enum: - mediatek,mt6370-backlight - mediatek,mt6372-backlight ------------------------------------------ 3. Remove the 'maximum' value of 'default-brightness' and 'max-brightness', and add "if-else" to determine the "maximum" value as follows ------------------------------------------ default-brightness: minimum: 0 max-brightness: minimum: 0 ... if: properties: compatible: contains: const: mediatek,mt6372-backlight then: properties: default-brightness: maximum: 16384 max-brightness: maximum: 16384 else: properties: default-brightness: maximum: 2048 max-brightness: maximum: 2048 ------------------------------------------ 4. Add a new boolean property to allow the user to determine whether to enable the exponential mode of backlight brightness or not. Like this, ------------------------------------------ mediatek,bled-exponential-mode-enable: description: | Enable the exponential mode of backlight brightness. If this property is not enabled, the default is to use linear mode. type: boolean ------------------------------------------ I hope these changes I have added will meet your expectations. And I'm not sure if I should remove 'Reviewed-By' first until it passes your review. Thanks.
diff --git a/Documentation/devicetree/bindings/leds/backlight/mediatek,mt6370-backlight.yaml b/Documentation/devicetree/bindings/leds/backlight/mediatek,mt6370-backlight.yaml new file mode 100644 index 0000000..d674212 --- /dev/null +++ b/Documentation/devicetree/bindings/leds/backlight/mediatek,mt6370-backlight.yaml @@ -0,0 +1,92 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/leds/backlight/mediatek,mt6370-backlight.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: MediaTek MT6370 Backlight + +maintainers: + - ChiaEn Wu <chiaen_wu@richtek.com> + +description: | + This module is part of the MT6370 MFD device. + The MT6370 Backlight WLED driver supports up to a 29V output voltage for + 4 channels of 8 series WLEDs. Each channel supports up to 30mA of current + capability with 2048 current steps (11 bits) in exponential or linear + mapping curves. + +allOf: + - $ref: common.yaml# + +properties: + compatible: + const: mediatek,mt6370-backlight + + default-brightness: + minimum: 0 + maximum: 2048 + + max-brightness: + minimum: 0 + maximum: 2048 + + enable-gpios: + description: External backlight 'enable' pin + maxItems: 1 + + mediatek,bled-pwm-enable: + description: | + Enable external PWM input for backlight dimming + type: boolean + + mediatek,bled-pwm-hys-enable: + description: | + Enable the backlight input-hysteresis for PWM mode + type: boolean + + mediatek,bled-pwm-hys-input-th-steps: + $ref: /schemas/types.yaml#/definitions/uint8 + enum: [1, 4, 16, 64] + description: | + The selection of the upper and lower bounds threshold of backlight + PWM resolution. If we choose selection 64, the variation of PWM + resolution needs more than 64 steps. + + mediatek,bled-ovp-shutdown: + description: | + Enable the backlight shutdown when OVP level triggered + type: boolean + + mediatek,bled-ovp-microvolt: + enum: [17000000, 21000000, 25000000, 29000000] + description: | + Backlight OVP level selection. + + mediatek,bled-ocp-shutdown: + description: | + Enable the backlight shutdown when OCP level triggerred. + type: boolean + + mediatek,bled-ocp-microamp: + enum: [900000, 1200000, 1500000, 1800000] + description: | + Backlight OC level selection. + + mediatek,bled-channel-use: + $ref: /schemas/types.yaml#/definitions/uint8 + description: | + Backlight LED channel to be used. + Each bit mapping to: + - 0: CH4 + - 1: CH3 + - 2: CH2 + - 3: CH1 + minimum: 1 + maximum: 15 + +required: + - compatible + - mediatek,bled-channel-use + +additionalProperties: false