The G12A/G12B Socs embeds a specific clock tree for each CPU cluster : cpu_clk / cpub_clk | \- cpu_clk_dyn | | \- cpu_clk_premux0 | | |- cpu_clk_postmux0 | | | |- cpu_clk_dyn0_div | | | \- xtal/fclk_div2/fclk_div3 | | \- xtal/fclk_div2/fclk_div3 | \- cpu_clk_premux1 | |- cpu_clk_postmux1 | | |- cpu_clk_dyn1_div | | \- xtal/fclk_div2/fclk_div3 | \- xtal/fclk_div2/fclk_div3 \ sys_pll / sys1_pll
This patchset adds notifiers on cpu_clk / cpub_clk, cpu_clk_dyn, cpu_clk_premux0 and sys_pll / sys1_pll to permit change frequency of the CPU clock in a safe way as recommended by the vendor Documentation and reference code. This patchset : - introduces needed core and meson clk changes - adds the clock notifiers Dependencies: - None This patchset is split from the v3 RFC/RFC patchset at [3] Changes from v1 at [4]: - Removed export of regmap_div ops functions - Added standalone cpu dynamic divider driver - Uses cpu dynamic divider driver in g12a clkc driver - Added missing signed-off tags - Fixed missing removal of CLKID_CPUB_CLK from internal g12a.h Changes from RFT/RFC v3 at [3]: - Rebased on clk-meson v5.4/drivers tree with Alexandre's patches - Removed the eeclk setup() callback, moved to a toplevel g12a-data struct Changes since RFT/RFC v2 at [2]: - Rebased on clk-meson v5.3/drivers trees - added Kevin's review tags Changes since RFT/RFC v1 at [1]: - Added EXPORT_SYMBOL_GPL() to clk_hw_set_parent - Added missing static to g12b_cpub_clk_mux0_div_ops and g12a_cpu_clk_mux_nb - Simplified g12a_cpu_clk_mux_notifier_cb() without switch/case - Fixed typo in "this the current path" in g12a.c - Fixed various checkpatch errors [1] https://patchwork.kernel.org/cover/11006929/ [2] https://patchwork.kernel.org/cover/11017273/ [3] https://patchwork.kernel.org/cover/11025309/ [4] https://patchwork.kernel.org/cover/11063803/ Neil Armstrong (4): clk: core: introduce clk_hw_set_parent() clk: meson: add g12a cpu dynamic divider driver clk: meson: g12a: add notifiers to handle cpu clock change clk: meson: g12a: expose CPUB clock ID for G12B drivers/clk/clk.c | 6 + drivers/clk/meson/Kconfig | 5 + drivers/clk/meson/Makefile | 1 + drivers/clk/meson/clk-cpu-dyndiv.c | 73 ++++ drivers/clk/meson/clk-cpu-dyndiv.h | 20 + drivers/clk/meson/g12a.c | 535 +++++++++++++++++++++++--- drivers/clk/meson/g12a.h | 1 - include/dt-bindings/clock/g12a-clkc.h | 1 + include/linux/clk-provider.h | 1 + 9 files changed, 588 insertions(+), 55 deletions(-) create mode 100644 drivers/clk/meson/clk-cpu-dyndiv.c create mode 100644 drivers/clk/meson/clk-cpu-dyndiv.h -- 2.22.0
