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Mon, 24 Oct 2022 07:10:22 -0400 (EDT) From: Alistair Francis To: linux-input@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Cc: linus.walleij@linaro.org, s.hauer@pengutronix.de, robh+dt@kernel.org, andreas@kemnade.info, krzysztof.kozlowski+dt@linaro.org, alistair23@gmail.com, dmitry.torokhov@gmail.com, rydberg@bitmath.org, shawnguo@kernel.org, Alistair Francis Subject: [PATCH v9 0/4] Add support for the Cypress cyttsp5 Date: Mon, 24 Oct 2022 21:10:13 +1000 Message-Id: <20221024111017.43859-1-alistair@alistair23.me> X-Mailer: git-send-email 2.37.3 MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20221024_041034_804795_C82AAE33 X-CRM114-Status: GOOD ( 13.86 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org This patch series builds on top of [1] and adds support for the cyttsp5 touchscreen controller for the reMarkable 2. I first tried to add an I2C HID device. Although the cyttsp5 has some HID looking aspects it is not HID compatible. Just in trying to probe the device I found: - The HID descriptor has extra padding - The HID descriptor sets the high bytes of the descriptor length - The HID descriptor has extra unrecognised tags - The HID reset command doesn't appear to work I don't think there is a way to use the I2C HID framework with the cyttsp5. For anyone interested you can see the work here [2]. In that branch though I can only obtain a HID descriptor, nothing else works without more core changes. So instead I rebased the series from [1]. Converted to the new yaml DTS documentation, added regulator support and fixed a x/y miscalculation bug. 1: https://lwn.net/ml/linux-kernel/20180703094309.18514-1-mylene.josserand@bootlin.com/ 2: https://github.com/alistair23/linux/commits/rM2-mainline-cyttsp5-hid v9: - Fixup kernel robot failures v8: - Rebase and resend v7: - Fix device tree warnings v6: - Use reg for the button properties v5: - Address review comments from v4 Alistair Francis (4): Input: Add driver for Cypress Generation 5 touchscreen dt-bindings: input: Add Cypress TT2100 touchscreen controller ARM: imx_v6_v7_defconfig: Enable the cyttsp5 touchscreen ARM: dts: imx7d-remarkable2: Enable the cyttsp5 .../input/touchscreen/cypress,tt21000.yaml | 100 ++ arch/arm/boot/dts/imx7d-remarkable2.dts | 100 ++ arch/arm/configs/imx_v6_v7_defconfig | 1 + drivers/input/touchscreen/Kconfig | 16 + drivers/input/touchscreen/Makefile | 1 + drivers/input/touchscreen/cyttsp5.c | 902 ++++++++++++++++++ 6 files changed, 1120 insertions(+) create mode 100644 Documentation/devicetree/bindings/input/touchscreen/cypress,tt21000.yaml create mode 100644 drivers/input/touchscreen/cyttsp5.c