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| Filename | Latest commit message | Latest commit date |
|---|---|---|
0d6e0a192e
[ Upstream commit a9164910c5ceed63551280a4a0b85d37ac2b19a5 ]
Indicated by AML code in ACPI table, the touchpad in-use could be found
on two possible slave addresses on &i2c3, i.e. hid@15 and hid@2c. And
which one is in-use can be determined by reading another address on the
I2C bus. Unfortunately, for DT boot, there is currently no support in
firmware to make this check and patch DT accordingly. This results in
a non-functional touchpad on those C630 devices with hid@2c.
As i2c-hid driver will stop probing the device if there is nothing on
the slave address, we can actually keep both devices enabled in DT, and
i2c-hid driver will only probe the existing one. The only problem is
that we cannot set up pinctrl in both device nodes, as two devices with
the same pinctrl will cause pin conflict that makes the second device
fail to probe. Let's move the pinctrl state up to parent node to solve
this problem. As the pinctrl state of parent node is already defined in
sdm845.dtsi, it ends up with overwriting pinctrl-0 with i2c3_hid_active
state added in there.
Fixes: 11d0e4f28156 ("arm64: dts: qcom: c630: Polish i2c-hid devices")
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Link: https://lore.kernel.org/r/20210102045940.26874-1-shawn.guo@linaro.org
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.