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From:   Alistair Francis <alistair@alistair23.me>
To:     linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org,
        linux-input@vger.kernel.org, linux-kernel@vger.kernel.org
Cc:     mylene.josserand@free-electrons.com, linus.walleij@linaro.org,
        andreas@kemnade.info, rydberg@bitmath.org,
        dmitry.torokhov@gmail.com, robh+dt@kernel.org,
        alistair23@gmail.com, Alistair Francis <alistair@alistair23.me>
Subject: [PATCH v2 0/4] Add support for the Cypress cyttsp5
Date:   Wed,  3 Nov 2021 21:48:26 +1000
Message-Id: <20211103114830.62711-1-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
Alistair Francis (2):=0D
  ARM: imx_v6_v7_defconfig: Enable the cyttsp5 touchscreen=0D
  ARM: dts: imx7d: remarkable2: Enable the cyttsp5=0D
=0D
Myl=C3=A8ne Josserand (2):=0D
  Input: Add driver for Cypress Generation 5 touchscreen=0D
  Documentation: DT: bindings: input: Add documentation for cyttsp5=0D
=0D
 .../input/touchscreen/cypress,tt21000.yaml    |   92 ++=0D
 arch/arm/boot/dts/imx7d-remarkable2.dts       |   89 ++=0D
 arch/arm/configs/imx_v6_v7_defconfig          |    1 +=0D
 drivers/input/touchscreen/Kconfig             |   14 +=0D
 drivers/input/touchscreen/Makefile            |    1 +=0D
 drivers/input/touchscreen/cyttsp5.c           | 1135 +++++++++++++++++=0D
 6 files changed, 1332 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
2.31.1=0D
=0D