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From:   Alistair Francis <alistair@alistair23.me>
To:     linux-input@vger.kernel.org, devicetree@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org
Cc:     alistair23@gmail.com, rydberg@bitmath.org,
        linus.walleij@linaro.org, robh+dt@kernel.org,
        dmitry.torokhov@gmail.com, andreas@kemnade.info,
        Alistair Francis <alistair@alistair23.me>
Subject: [PATCH v7 0/4] Add support for the Cypress cyttsp5
Date:   Wed, 23 Mar 2022 22:00:17 +1000
Message-Id: <20220323120021.361137-1-alistair@alistair23.me>
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This patch series builds on top of [1] and adds support for the cyttsp5=0D
touchscreen controller for the reMarkable 2.=0D
=0D
I first tried to add an I2C HID device. Although the cyttsp5 has some HID=0D
looking aspects it is not HID compatible. Just in trying to probe the devic=
e=0D
I found:=0D
 - The HID descriptor has extra padding=0D
 - The HID descriptor sets the high bytes of the descriptor length=0D
 - The HID descriptor has extra unrecognised tags=0D
 - The HID reset command doesn't appear to work=0D
=0D
I don't think there is a way to use the I2C HID framework with the cyttsp5.=
=0D
For anyone interested you can see the work here [2]. In that branch though =
I=0D
can only obtain a HID descriptor, nothing else works without more core=0D
changes.=0D
=0D
So instead I rebased the series from [1]. Converted to the new yaml DTS=0D
documentation, added regulator support and fixed a x/y miscalculation bug.=
=0D
=0D
1: https://lwn.net/ml/linux-kernel/20180703094309.18514-1-mylene.josserand@=
bootlin.com/=0D
2: https://github.com/alistair23/linux/commits/rM2-mainline-cyttsp5-hid=0D
=0D
v7:=0D
 - Fix device tree warnings=0D
v6:=0D
 - Use reg for the button properties=0D
v5:=0D
 - Address review comments from v4=0D
=0D
Alistair Francis (4):=0D
  Input: Add driver for Cypress Generation 5 touchscreen=0D
  dt-bindings: input: Add Cypress TT2100 touchscreen controller=0D
  ARM: imx_v6_v7_defconfig: Enable the cyttsp5 touchscreen=0D
  ARM: dts: imx7d-remarkable2: Enable the cyttsp5=0D
=0D
 .../input/touchscreen/cypress,tt21000.yaml    | 101 ++=0D
 arch/arm/boot/dts/imx7d-remarkable2.dts       | 100 ++=0D
 arch/arm/configs/imx_v6_v7_defconfig          |   1 +=0D
 drivers/input/touchscreen/Kconfig             |  16 +=0D
 drivers/input/touchscreen/Makefile            |   1 +=0D
 drivers/input/touchscreen/cyttsp5.c           | 902 ++++++++++++++++++=0D
 6 files changed, 1121 insertions(+)=0D
 create mode 100644 Documentation/devicetree/bindings/input/touchscreen/cyp=
ress,tt21000.yaml=0D
 create mode 100644 drivers/input/touchscreen/cyttsp5.c=0D
=0D
-- =0D
2.35.1=0D
=0D