forked from Minki/linux
mainlining shenanigans
fcd104b50f
The GPU has two functional clocks - GPU_CORE_GCLK and GPU_HYD_GCLK. Both of these are mux clocks and are derived from the DPLL_CORE H14 output clock CORE_GPU_CLK by default. These clocks can also be be derived from DPLL_PER or DPLL_GPU. The GPU DPLL provides the output clocks primarily for the GPU. Configuring the GPU for different OPP clock frequencies is easier to achieve when using the DPLL_GPU rather than the other two DPLLs due to: 1. minimal affect on any other output clocks from these DPLLs 2. may require an impossible post-divider values on existing DPLLs without affecting other clocks. So, switch the GPU functional clocks to be sourced from GPU DPLL by default. This is done using the DT standard properties "assigned-clocks" and "assigned-clock-parents". Newer u-boots (from 2017.01 onwards) reuse and can update these properties to choose an appropriate one-time fixed OPP configuration as all the required ABB/AVS setup is performed within the bootloader. Note that there is no DVFS supported for any of the non-MPU domains. The DPLL will automatically transition into a low-power stop mode when the associated output clocks are not utilized or gated automatically. This patch also sets the initial values for the DPLL_GPU outputs. These values are chosen based on the OPP_NOM values defined as per recommendation from design team. The DPLL locked frequency is kept at 1277 MHz, so that the value for the divider clock, dpll_gpu_m2_ck, can be set to 425.67 MHz for OPP_NOM. Signed-off-by: Subhajit Paul <subhajit_paul@ti.com> [s-anna@ti.com: revise patch description] Signed-off-by: Suman Anna <s-anna@ti.com> Acked-by: Tero Kristo <t-kristo@ti.com> Signed-off-by: Tony Lindgren <tony@atomide.com> |
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| README | ||
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. 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.