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media: dt-bindings: cec-gpio: convert to DT schema
Convert HDMI CEC GPIO bindings to DT schema. Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org> Reviewed-by: Rob Herring <robh@kernel.org> Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
This commit is contained in:
Krzysztof Kozlowski
Mauro Carvalho Chehab
parent
91b40d445d
commit
343e1eb45d
3 changed files with 75 additions and 43 deletions
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@ -1,42 +0,0 @@
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* HDMI CEC GPIO driver
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The HDMI CEC GPIO module supports CEC implementations where the CEC line
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is hooked up to a pull-up GPIO line and - optionally - the HPD line is
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hooked up to another GPIO line.
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Please note: the maximum voltage for the CEC line is 3.63V, for the HPD and
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5V lines it is 5.3V. So you may need some sort of level conversion circuitry
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when connecting them to a GPIO line.
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Required properties:
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- compatible: value must be "cec-gpio".
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- cec-gpios: gpio that the CEC line is connected to. The line should be
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tagged as open drain.
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If the CEC line is associated with an HDMI receiver/transmitter, then the
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following property is also required:
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- hdmi-phandle - phandle to the HDMI controller, see also cec.txt.
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If the CEC line is not associated with an HDMI receiver/transmitter, then
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the following property is optional and can be used for debugging HPD changes:
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- hpd-gpios: gpio that the HPD line is connected to.
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This property is optional and can be used for debugging changes on the 5V line:
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- v5-gpios: gpio that the 5V line is connected to.
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Example for the Raspberry Pi 3 where the CEC line is connected to
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pin 26 aka BCM7 aka CE1 on the GPIO pin header, the HPD line is
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connected to pin 11 aka BCM17 and the 5V line is connected to pin
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15 aka BCM22 (some level shifter is needed for the HPD and 5V lines!):
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#include <dt-bindings/gpio/gpio.h>
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cec-gpio {
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compatible = "cec-gpio";
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cec-gpios = <&gpio 7 (GPIO_ACTIVE_HIGH|GPIO_OPEN_DRAIN)>;
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hpd-gpios = <&gpio 17 GPIO_ACTIVE_HIGH>;
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v5-gpios = <&gpio 22 GPIO_ACTIVE_HIGH>;
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};
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74
Documentation/devicetree/bindings/media/cec/cec-gpio.yaml
Normal file
74
Documentation/devicetree/bindings/media/cec/cec-gpio.yaml
Normal file
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# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
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%YAML 1.2
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---
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$id: http://devicetree.org/schemas/media/cec/cec-gpio.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: HDMI CEC GPIO
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maintainers:
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- Hans Verkuil <hverkuil-cisco@xs4all.nl>
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description: |
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The HDMI CEC GPIO module supports CEC implementations where the CEC line is
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hooked up to a pull-up GPIO line and - optionally - the HPD line is hooked up
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to another GPIO line.
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Please note:: the maximum voltage for the CEC line is 3.63V, for the HPD and
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5V lines it is 5.3V. So you may need some sort of level conversion
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circuitry when connecting them to a GPIO line.
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properties:
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compatible:
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const: cec-gpio
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cec-gpios:
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maxItems: 1
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description:
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GPIO that the CEC line is connected to. The line should be tagged as open
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drain.
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hpd-gpios:
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maxItems: 1
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description:
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GPIO that the HPD line is connected to. Used for debugging HPD changes
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when the CEC line is not associated with an HDMI receiver/transmitter.
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v5-gpios:
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maxItems: 1
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description:
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GPIO that the 5V line is connected to. Used for debugging changes on the
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5V line.
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required:
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- compatible
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- cec-gpios
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allOf:
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- $ref: cec-common.yaml#
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- if:
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required:
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- hdmi-phandle
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then:
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properties:
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hpd-gpios: false
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- if:
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required:
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- hpd-gpios
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then:
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properties:
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hdmi-phandle: false
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unevaluatedProperties: false
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examples:
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- |
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#include <dt-bindings/gpio/gpio.h>
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cec {
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compatible = "cec-gpio";
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cec-gpios = <&gpio 7 (GPIO_ACTIVE_HIGH|GPIO_OPEN_DRAIN)>;
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hpd-gpios = <&gpio 17 GPIO_ACTIVE_HIGH>;
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v5-gpios = <&gpio 22 GPIO_ACTIVE_HIGH>;
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};
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@ -4850,7 +4850,7 @@ L: linux-media@vger.kernel.org
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S: Supported
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W: http://linuxtv.org
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T: git git://linuxtv.org/media_tree.git
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F: Documentation/devicetree/bindings/media/cec-gpio.txt
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F: Documentation/devicetree/bindings/media/cec/cec-gpio.yaml
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F: drivers/media/cec/platform/cec-gpio/
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CELL BROADBAND ENGINE ARCHITECTURE
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