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[45.117.96.243]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-724079a403fsm3579656b3a.105.2024.11.08.04.03.26 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 08 Nov 2024 04:03:29 -0800 (PST) From: Charles Wang To: krzk@kernel.org, hbarnor@chromium.org, dianders@chromium.org, conor.dooley@microchip.com Cc: dmitry.torokhov@gmail.com, jikos@kernel.org, bentiss@kernel.org, linux-input@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Charles Wang Subject: [PATCH v3 1/2] dt-bindings: input: Goodix GT7986U SPI HID Touchscreen Date: Fri, 8 Nov 2024 20:03:10 +0800 Message-ID: <20241108120311.87795-2-charles.goodix@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20241108120311.87795-1-charles.goodix@gmail.com> References: <20241108120311.87795-1-charles.goodix@gmail.com> Precedence: bulk X-Mailing-List: linux-input@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 The Goodix GT7986U touch controller report touch data according to the HID protocol through the SPI bus. However, it is incompatible with Microsoft's HID-over-SPI protocol. NOTE: these bindings are distinct from the bindings used with the GT7986U when the chip is running I2C firmware. For some background, see discussion on the mailing lists in the thread: https://lore.kernel.org/r/20241018020815.3098263-2-charles.goodix@gmail.com Signed-off-by: Charles Wang --- .../bindings/input/goodix,gt7986u-spifw.yaml | 75 +++++++++++++++++++ 1 file changed, 75 insertions(+) create mode 100644 Documentation/devicetree/bindings/input/goodix,gt7986u-spifw.yaml diff --git a/Documentation/devicetree/bindings/input/goodix,gt7986u-spifw.yaml b/Documentation/devicetree/bindings/input/goodix,gt7986u-spifw.yaml new file mode 100644 index 000000000..8105b9ce2 --- /dev/null +++ b/Documentation/devicetree/bindings/input/goodix,gt7986u-spifw.yaml @@ -0,0 +1,75 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/input/goodix,gt7986u-spifw.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Goodix GT7986U SPI HID Touchscreen + +maintainers: + - Charles Wang + +description: Supports the Goodix GT7986U touchscreen. + This touch controller reports data packaged according to the HID protocol + over the SPI bus, but it is incompatible with Microsoft's HID-over-SPI protocol. + + NOTE: these bindings are distinct from the bindings used with the + GT7986U when the chip is running I2C firmware. This is because there's + not a single device that talks over both I2C and SPI but rather + distinct touchscreens that happen to be built with the same ASIC but + that are distinct products running distinct firmware. + +allOf: + - $ref: /schemas/spi/spi-peripheral-props.yaml# + +properties: + compatible: + enum: + - goodix,gt7986u-spifw + + reg: + maxItems: 1 + + interrupts: + maxItems: 1 + + reset-gpios: + maxItems: 1 + + goodix,hid-report-addr: + $ref: /schemas/types.yaml#/definitions/uint32 + description: + The register address for retrieving HID report data. + + spi-max-frequency: true + +required: + - compatible + - reg + - interrupts + - reset-gpios + - goodix,hid-report-addr + +unevaluatedProperties: false + +examples: + - | + #include + #include + + spi { + #address-cells = <1>; + #size-cells = <0>; + + touchscreen@0 { + compatible = "goodix,gt7986u-spifw"; + reg = <0>; + interrupt-parent = <&gpio>; + interrupts = <25 IRQ_TYPE_LEVEL_LOW>; + reset-gpios = <&gpio1 1 GPIO_ACTIVE_LOW>; + spi-max-frequency = <10000000>; + goodix,hid-report-addr = <0x22c8c>; + }; + }; + +...