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[92.34.215.146]) by smtp.gmail.com with ESMTPSA id v4sm534624lfa.309.2020.11.12.03.56.49 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 12 Nov 2020 03:56:50 -0800 (PST) From: Linus Walleij To: Jacek Anaszewski , Pavel Machek , Dan Murphy Cc: linux-leds@vger.kernel.org, Linus Walleij , Sakari Ailus , newbytee@protonmail.com, Stephan Gerhold , phone-devel@vger.kernel.org, linux-media@vger.kernel.org, devicetree@vger.kernel.org Subject: [PATCH 1/2 v4] dt-bindings: leds: Add DT binding for Richtek RT8515 Date: Thu, 12 Nov 2020 12:56:45 +0100 Message-Id: <20201112115646.2562467-1-linus.walleij@linaro.org> X-Mailer: git-send-email 2.26.2 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org Add a YAML devicetree binding for the Richtek RT8515 dual channel flash/torch LED driver. Cc: Sakari Ailus Cc: newbytee@protonmail.com Cc: Stephan Gerhold Cc: phone-devel@vger.kernel.org Cc: linux-media@vger.kernel.org Cc: devicetree@vger.kernel.org Signed-off-by: Linus Walleij --- ChangeLog v3->v4: - Add DT attributes for the RFS and RTS resistors, so that the hardware-defined maximum current can be determined. - Add torch-max-microamp to the common bindings so we can set an attribute for the max microamp in torch mode. - Add flash-max-microamp and torch-max-microamp as optional to the LED node. - Slot in some elabortative descriptions of the new properties and describe what the hardware is doing. - Cc phone-devel@vger.kernel.org ChangeLog v2->v3: - Add Sakari to CC - Resend ChangeLog v1->v2: - Explicitly inherit function, color and flash-max-timeout-us from common.yaml - Add "led" node as required. --- .../devicetree/bindings/leds/common.yaml | 6 + .../bindings/leds/richtek,rt8515.yaml | 111 ++++++++++++++++++ 2 files changed, 117 insertions(+) create mode 100644 Documentation/devicetree/bindings/leds/richtek,rt8515.yaml diff --git a/Documentation/devicetree/bindings/leds/common.yaml b/Documentation/devicetree/bindings/leds/common.yaml index 08b6700ca61e..28bdf09b4af4 100644 --- a/Documentation/devicetree/bindings/leds/common.yaml +++ b/Documentation/devicetree/bindings/leds/common.yaml @@ -151,6 +151,12 @@ properties: Maximum flash LED supply current in microamperes. Required for flash LED nodes with configurable current. + torch-max-microamp: + description: + Maximum flash LED supply current in microamperes, when the flash LED is + used as a torch (flashlight). This is usually lower than the flash mode + maximum current, if the LED supports torch mode. + flash-max-timeout-us: description: Maximum timeout in microseconds after which the flash LED is turned off. diff --git a/Documentation/devicetree/bindings/leds/richtek,rt8515.yaml b/Documentation/devicetree/bindings/leds/richtek,rt8515.yaml new file mode 100644 index 000000000000..5f65a20b997d --- /dev/null +++ b/Documentation/devicetree/bindings/leds/richtek,rt8515.yaml @@ -0,0 +1,111 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/leds/richtek,rt8515.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Richtek RT8515 1.5A dual channel LED driver + +maintainers: + - Linus Walleij + +description: | + The Richtek RT8515 is a dual channel (two mode) LED driver that + supports driving a white LED in flash or torch mode. The maximum + current for each mode is defined in hardware using two resistors + RFS and RTS. + +properties: + compatible: + const: richtek,rt8515 + + enf-gpios: + maxItems: 1 + description: A connection to the 'ENF' (enable flash) pin. + + ent-gpios: + maxItems: 1 + description: A connection to the 'ENT' (enable torch) pin. + + richtek,rfs: + maxItems: 1 + minimum: 7680 + maximum: 367000 + description: The resistance value of the RFS resisitor. This + resistors limits the maximum flash current. This must be set + for the property flash-max-microamp to work, the RFS resistor + defines the range of the dimmer setting (brightness) of the + flash LED. + + richtek,rts: + maxItems: 1 + minimum: 7680 + maximum: 367000 + description: The resistance value of the RTS resisitor. This + resistors limits the maximum torch current. This must be set + for the property torch-max-microamp to work, the RTS resistor + defines the range of the dimmer setting (brightness) of the + torch LED. + + led: + type: object + $ref: common.yaml# + properties: + function: true + color: true + flash-max-timeout-us: true + + flash-max-microamp: + maximum: 700000 + description: The maximum current for flash mode + is hardwired to the component using the RFS resistor to + ground. The maximum hardware current setting is calculated + according to the formula Imax = 5500 / RFS. The lowest + allowed resistance value is 7.86 kOhm giving an absolute + maximum current of 700mA. By setting this attribute in + the device tree, you can further restrict the maximum + current below the hardware limit. This requires the RFS + to be defined as it defines the maximum range. + + torch-max-microamp: + maximum: 700000 + description: The maximum current for torch mode + is hardwired to the component using the RTS resistor to + ground. The maximum hardware current setting is calculated + according to the formula Imax = 5500 / RTS. The lowest + allowed resistance value is 7.86 kOhm giving an absolute + maximum current of 700mA. By setting this attribute in + the device tree, you can further restrict the maximum + current below the hardware limit. This requires the RTS + to be defined as it defines the maximum range. + +required: + - compatible + - ent-gpios + - enf-gpios + - led + +additionalProperties: false + +examples: + - | + #include + #include + + led-controller { + compatible = "richtek,rt8515"; + enf-gpios = <&gpio4 12 GPIO_ACTIVE_HIGH>; + ent-gpios = <&gpio4 13 GPIO_ACTIVE_HIGH>; + richtek,rfs = <16000>; + richtek,rts = <100000>; + + led { + function = LED_FUNCTION_FLASH; + color = ; + flash-max-timeout-us = <250000>; + flash-max-microamp = <150000>; + torch-max-microamp = <25000>; + }; + }; + +...