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The serdes I/O region is where the PLL for the phy is controlled. Sometimes the PLL is shared between multiple phys, for example in the PCIe case where there are three phys inside the same wrapper. Other times the PLL is for a single phy, i.e. some USB3 phys. To complete the trifecta we have the USB3+DP combo phy where the USB3 and DP phys each have their own serdes region because they have their own PLL while they both share a common I/O region pertaining to the USB type-c pinout and cable orientation. Let's move the serdes iomem pointer into 'struct qmp_phy' so that we can correlate PLL control to the phy that uses it. This allows us to support the USB3+DP combo phy in this driver. This isn't a problem for the 3-lane/phy PCIe phy because there is a common init function that is the only place the serdes region is programmed. Furthermore, move the configuration data that contains most of the register programming sequences to the qmp phy struct. This data isn't qmp wrapper specific. It is phy specific data used to tune various settings for things like pre-emphasis, bias, etc. Signed-off-by: Stephen Boyd <swboyd@chromium.org> Cc: Jeykumar Sankaran <jsanka@codeaurora.org> Cc: Chandan Uddaraju <chandanu@codeaurora.org> Cc: Vara Reddy <varar@codeaurora.org> Cc: Tanmay Shah <tanmay@codeaurora.org> Cc: Bjorn Andersson <bjorn.andersson@linaro.org> Cc: Manu Gautam <mgautam@codeaurora.org> Cc: Sandeep Maheswaram <sanm@codeaurora.org> Cc: Douglas Anderson <dianders@chromium.org> Cc: Sean Paul <seanpaul@chromium.org> Cc: Jonathan Marek <jonathan@marek.ca> Cc: Dmitry Baryshkov <dmitry.baryshkov@linaro.org> Cc: Rob Clark <robdclark@chromium.org> Link: https://lore.kernel.org/r/20200916231202.3637932-5-swboyd@chromium.org Signed-off-by: Vinod Koul <vkoul@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.