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[1.171.10.206]) by smtp.gmail.com with ESMTPSA id gm18sm7987947pjb.55.2020.12.11.08.33.56 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Fri, 11 Dec 2020 08:33:57 -0800 (PST) From: cy_huang To: lee.jones@linaro.org, robh+dt@kernel.org Cc: cy_huang@richtek.com, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org Subject: [PATCH v4 2/3] backlight: rt4831: Adds DT binding document for Richtek RT4831 backlight Date: Sat, 12 Dec 2020 00:33:43 +0800 Message-Id: <1607704424-16223-2-git-send-email-u0084500@gmail.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1607704424-16223-1-git-send-email-u0084500@gmail.com> References: <1607704424-16223-1-git-send-email-u0084500@gmail.com> Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org From: ChiYuan Huang Adds DT binding document for Richtek RT4831 backlight. Signed-off-by: ChiYuan Huang --- since v3 - Move inlcude/dt-bindings/leds/rt4831-backlight.h from v3 mfd binding patch to here. - Add dual license tag in header and backlight binding document. - Left backlight dt-binding example only. --- .../leds/backlight/richtek,rt4831-backlight.yaml | 76 ++++++++++++++++++++++ include/dt-bindings/leds/rt4831-backlight.h | 23 +++++++ 2 files changed, 99 insertions(+) create mode 100644 Documentation/devicetree/bindings/leds/backlight/richtek,rt4831-backlight.yaml create mode 100644 include/dt-bindings/leds/rt4831-backlight.h diff --git a/Documentation/devicetree/bindings/leds/backlight/richtek,rt4831-backlight.yaml b/Documentation/devicetree/bindings/leds/backlight/richtek,rt4831-backlight.yaml new file mode 100644 index 00000000..f24c8d1 --- /dev/null +++ b/Documentation/devicetree/bindings/leds/backlight/richtek,rt4831-backlight.yaml @@ -0,0 +1,76 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/leds/backlight/richtek,rt4831-backlight.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Richtek RT4831 Backlight + +maintainers: + - ChiYuan Huang + +description: | + RT4831 is a mutifunctional device that can provide power to the LCD display + and LCD backlight. + + For the LCD backlight, it can provide four channel WLED driving capability. + Each channel driving current is up to 30mA + + Datasheet is available at + https://www.richtek.com/assets/product_file/RT4831A/DS4831A-05.pdf + +properties: + compatible: + const: richtek,rt4831-backlight + + default-brightness: + description: | + The default brightness that applied to the system on start-up. + $ref: /schemas/types.yaml#/definitions/uint32 + minimum: 0 + maximum: 2048 + + max-brightness: + description: | + The max brightness for the H/W limit + $ref: /schemas/types.yaml#/definitions/uint32 + minimum: 0 + maximum: 2048 + + richtek,pwm-enable: + description: | + Specify the backlight dimming following by PWM duty or by SW control. + type: boolean + + richtek,bled-ovp-sel: + description: | + Backlight OVP level selection, currently support 17V/21V/25V/29V. + $ref: /schemas/types.yaml#/definitions/uint8 + default: 1 + minimum: 0 + maximum: 3 + + richtek,channel-use: + description: | + Backlight LED channel to be used. + BIT 0/1/2/3 is used to indicate led channel 1/2/3/4 enable or disable. + $ref: /schemas/types.yaml#/definitions/uint8 + minimum: 1 + maximum: 15 + +required: + - compatible + - richtek,channel-use + +additionalProperties: false + +examples: + - | + #include + backlight { + compatible = "richtek,rt4831-backlight"; + default-brightness = <1024>; + max-brightness = <2048>; + richtek,bled-ovp-sel = /bits/ 8 ; + richtek,channel-use = /bits/ 8 ; + }; diff --git a/include/dt-bindings/leds/rt4831-backlight.h b/include/dt-bindings/leds/rt4831-backlight.h new file mode 100644 index 00000000..125c635 --- /dev/null +++ b/include/dt-bindings/leds/rt4831-backlight.h @@ -0,0 +1,23 @@ +/* SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) */ +/* + * This header provides constants for rt4831 backlight bindings. + * + * Copyright (C) 2020, Richtek Technology Corp. + * Author: ChiYuan Huang + */ + +#ifndef _DT_BINDINGS_RT4831_BACKLIGHT_H +#define _DT_BINDINGS_RT4831_BACKLIGHT_H + +#define RT4831_BLOVPLVL_17V 0 +#define RT4831_BLOVPLVL_21V 1 +#define RT4831_BLOVPLVL_25V 2 +#define RT4831_BLOVPLVL_29V 3 + +#define RT4831_BLED_CH1EN (1 << 0) +#define RT4831_BLED_CH2EN (1 << 1) +#define RT4831_BLED_CH3EN (1 << 2) +#define RT4831_BLED_CH4EN (1 << 3) +#define RT4831_BLED_ALLCHEN ((1 << 4) - 1) + +#endif /* _DT_BINDINGS_RT4831_BACKLIGHT_H */