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Wed, 07 Jan 2026 22:35:33 -0800 (PST) Received: from dgp100339560-01.huaqin.com ([103.117.77.121]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-34f5fa93ee7sm6712750a91.7.2026.01.07.22.35.31 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 07 Jan 2026 22:35:33 -0800 (PST) From: Langyan Ye To: dmitry.torokhov@gmail.com, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, jikos@kernel.org, bentiss@kernel.org Cc: dianders@chromium.org, linux-input@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Langyan Ye , Conor Dooley Subject: [PATCH V3 RESEND 1/2] dt-bindings: input: Add Parade TC3408 touchscreen controller Date: Thu, 8 Jan 2026 14:35:23 +0800 Message-Id: <20260108063524.742464-2-yelangyan@huaqin.corp-partner.google.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20260108063524.742464-1-yelangyan@huaqin.corp-partner.google.com> References: <20260108063524.742464-1-yelangyan@huaqin.corp-partner.google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" The tc3408 touch screen chip same as Elan eKTH6915 controller has a reset gpio. The difference is that they have different post_power_delay_ms. Signed-off-by: Langyan Ye Reviewed-by: Conor Dooley --- .../bindings/input/parade,tc3408.yaml | 68 +++++++++++++++++++ 1 file changed, 68 insertions(+) create mode 100644 Documentation/devicetree/bindings/input/parade,tc3408.y= aml diff --git a/Documentation/devicetree/bindings/input/parade,tc3408.yaml b/D= ocumentation/devicetree/bindings/input/parade,tc3408.yaml new file mode 100644 index 000000000000..30ffefb96c68 --- /dev/null +++ b/Documentation/devicetree/bindings/input/parade,tc3408.yaml @@ -0,0 +1,68 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/input/parade,tc3408.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Parade TC3408 touchscreen controller + +maintainers: + - Langyan Ye + +description: | + Parade TC3408 is a touchscreen controller supporting the I2C-HID protoco= l. + It requires a reset GPIO and two power supplies (3.3V and 1.8V). + +allOf: + - $ref: /schemas/input/touchscreen/touchscreen.yaml# + +properties: + compatible: + const: parade,tc3408 + + reg: + maxItems: 1 + + interrupts: + maxItems: 1 + + reset-gpios: + maxItems: 1 + + vcc33-supply: + description: The 3.3V supply to the touchscreen. + + vccio-supply: + description: The 1.8V supply to the touchscreen. + +required: + - compatible + - reg + - interrupts + - reset-gpios + - vcc33-supply + - vccio-supply + +unevaluatedProperties: false + +examples: + - | + #include + #include + + i2c { + #address-cells =3D <1>; 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Wed, 07 Jan 2026 22:35:36 -0800 (PST) Received: from dgp100339560-01.huaqin.com ([103.117.77.121]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-34f5fa93ee7sm6712750a91.7.2026.01.07.22.35.33 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 07 Jan 2026 22:35:36 -0800 (PST) From: Langyan Ye To: dmitry.torokhov@gmail.com, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, jikos@kernel.org, bentiss@kernel.org Cc: dianders@chromium.org, linux-input@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Langyan Ye Subject: [PATCH V3 RESEND 2/2] HID: i2c-hid: elan: Add parade-tc3408 timing Date: Thu, 8 Jan 2026 14:35:24 +0800 Message-Id: <20260108063524.742464-3-yelangyan@huaqin.corp-partner.google.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20260108063524.742464-1-yelangyan@huaqin.corp-partner.google.com> References: <20260108063524.742464-1-yelangyan@huaqin.corp-partner.google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Parade-tc3408 requires reset to pull down time greater than 10ms, so the configuration post_power_delay_ms is 10, and the chipset initial time is required to be greater than 300ms, so the post_gpio_reset_on_delay_ms is set to 300. Signed-off-by: Langyan Ye Reviewed-by: Douglas Anderson --- drivers/hid/i2c-hid/i2c-hid-of-elan.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/hid/i2c-hid/i2c-hid-of-elan.c b/drivers/hid/i2c-hid/i2= c-hid-of-elan.c index 0215f217f6d8..2a6548fd234a 100644 --- a/drivers/hid/i2c-hid/i2c-hid-of-elan.c +++ b/drivers/hid/i2c-hid/i2c-hid-of-elan.c @@ -188,11 +188,19 @@ static const struct elan_i2c_hid_chip_data ilitek_ili= 2901_chip_data =3D { .main_supply_name =3D "vcc33", }; =20 +static const struct elan_i2c_hid_chip_data parade_tc3408_chip_data =3D { + .post_power_delay_ms =3D 10, + .post_gpio_reset_on_delay_ms =3D 300, + .hid_descriptor_address =3D 0x0001, + .main_supply_name =3D "vcc33", +}; + static const struct of_device_id elan_i2c_hid_of_match[] =3D { { .compatible =3D "elan,ekth6915", .data =3D &elan_ekth6915_chip_data }, { .compatible =3D "elan,ekth6a12nay", .data =3D &elan_ekth6a12nay_chip_da= ta }, { .compatible =3D "ilitek,ili9882t", .data =3D &ilitek_ili9882t_chip_data= }, { .compatible =3D "ilitek,ili2901", .data =3D &ilitek_ili2901_chip_data }, + { .compatible =3D "parade,tc3408", .data =3D ¶de_tc3408_chip_data }, { } }; MODULE_DEVICE_TABLE(of, elan_i2c_hid_of_match); --=20 2.34.1