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Stephen Boyd 73e6f3ae80 T-HEAD clock changes for v6.18 
Updates for the T-HEAD TH1520 clock controller:
 
  - Describe gate clocks with clk_gate so that clock gates can be clock
    parents. This is similar to the mux clock refactor in 54edba916e
    ("clk: thead: th1520-ap: Describe mux clocks with clk_mux").
 
  - Add support for enabling/disabling PLLs. Some PLLs are put into a
    disabled state by the bootloader, and clock driver now has the
    ability to enable them.
 
  - Set all AXI clocks to CLK_IS_CRITICAL. The AXI crossbar of TH1520 has
    no proper timeout handling, which means gating AXI clocks can easily
    lead to bus timeout and hang the system. All these clock gates are
    ungated by default on system reset.
 
  - Convert all current CLK_IGNORE_UNUSED usage to CLK_IS_CRITICAL to
    prevent unwanted clock gating.
 
  - Fix parent of padctrl0 clock, fix parent of DPU pixel clocks and
    support changing DPU pixel clock rate.
 
 All changes have been tested in linux-next.
 
 Signed-off-by: Drew Fustini <fustini@kernel.org>
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Merge tag 'thead-clk-for-v6.18' of git://git.kernel.org/pub/scm/linux/kernel/git/fustini/linux into clk-thead

Pull T-HEAD clock driver updates from Drew Fustini:

 - Describe gate clocks with clk_gate so that clock gates can be clock
   parents. This is similar to the mux clock refactor in 54edba916e
   ("clk: thead: th1520-ap: Describe mux clocks with clk_mux").
 - Add support for enabling/disabling PLLs. Some PLLs are put into a
   disabled state by the bootloader, and clock driver now has the
   ability to enable them.
 - Set all AXI clocks to CLK_IS_CRITICAL. The AXI crossbar of TH1520 has
   no proper timeout handling, which means gating AXI clocks can easily
   lead to bus timeout and hang the system. All these clock gates are
   ungated by default on system reset.
 - Convert all current CLK_IGNORE_UNUSED usage to CLK_IS_CRITICAL to
   prevent unwanted clock gating.
 - Fix parent of padctrl0 clock, fix parent of DPU pixel clocks and
   support changing DPU pixel clock rate.

* tag 'thead-clk-for-v6.18' of git://git.kernel.org/pub/scm/linux/kernel/git/fustini/linux:
  clk: thead: th1520-ap: set all AXI clocks to CLK_IS_CRITICAL
  clk: thead: support changing DPU pixel clock rate
  clk: thead: add support for enabling/disabling PLLs
  clk: thead: Correct parent for DPU pixel clocks
  clk: thead: th1520-ap: fix parent of padctrl0 clock
  clk: thead: th1520-ap: describe gate clocks with clk_gate
History 2025-09-13 14:56:54 -07:00
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README 

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 reStructuredText 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.