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f864e4b721
Add support for PLLDSI and its post-dividers in the RZ/V2H CPG driver and export helper APIs for use by the DSI driver. Introduce per-PLL-DSI state in the CPG private structure and provide a set of helper functions that find valid PLL parameter combinations for a requested frequency. The new helpers are rzv2h_get_pll_pars(), rzv2h_get_pll_div_pars(), rzv2h_get_pll_divs_pars() and rzv2h_get_pll_dtable_pars() and they are exported in the "RZV2H_CPG" namespace for use by other consumers (notably the DSI driver). These helpers perform iterative searches over PLL parameters (M, K, P, S) and optional post-dividers and return the best match (or an exact match when possible). Move PLL/CLK related limits and parameter types into the shared include (include/linux/clk/renesas.h) by adding struct rzv2h_pll_limits, struct rzv2h_pll_pars and struct rzv2h_pll_div_pars plus the RZV2H_CPG_PLL_DSI_LIMITS() helper macro to define DSI PLL limits. This change centralises the PLLDSI algorithms so the CPG and DSI drivers compute PLL parameters consistently and allows the DSI driver to accurately request rates and program its PLL. Co-developed-by: Fabrizio Castro <fabrizio.castro.jz@renesas.com> Signed-off-by: Fabrizio Castro <fabrizio.castro.jz@renesas.com> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com> Acked-by: Tomi Valkeinen <tomi.valkeinen+renesas@ideasonboard.com> Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be> Link: https://patch.msgid.link/20251015192611.241920-4-prabhakar.mahadev-lad.rj@bp.renesas.com Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> |
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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 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.