Hey, As I mentioned in my fixes for 5.18 [0], found out that the reference clock for the rtc is actually missing from the clock driver (and the dt binding). Currently the mpfs clock driver uses a reference clock called the "msspll", set in the device tree, as the parent for the cpu/axi/ahb (config) clocks. The frequency of the msspll is determined by the FPGA bitstream & the bootloader configures the clock to match the bitstream. The real reference is provided by a 100 or 125 MHz off chip oscillator. However, the msspll clock is not actually the parent of all clocks on the system - the reference clock for the rtc/mtimer actually has the off chip oscillator as its parent. This series enables reading the rate of the msspll clock, converts the refclock in the device tree to the external reference & adds the missing rtc reference clock. I assume it is okay not to add fixes tags for the rtc dt binding? Since the clock was previously missing, the binding is wrong, but idk if that qualifies as a fix? Clock driver changes depend on the fixes I sent in [0]. Please lmk if you want me to respin into a single series w/ the fixes. Thanks, Conor. [0]: https://lore.kernel.org/linux-riscv/20220408133543.3537118-1-conor.dooley@xxxxxxxxxxxxx/ Conor Dooley (7): dt-bindings: clk: mpfs document msspll dri registers dt-bindings: clk: mpfs: add defines for two new clocks dt-bindings: rtc: add refclk to mpfs-rtc clk: microchip: mpfs: re-parent the configurable clocks clk: microchip: mpfs: rename sys_base to base clk: microchip: mpfs: add RTCREF clock control riscv: dts: microchip: reparent mpfs clocks .../bindings/clock/microchip,mpfs.yaml | 11 +- .../bindings/rtc/microchip,mfps-rtc.yaml | 14 +- .../microchip/microchip-mpfs-icicle-kit.dts | 2 +- .../boot/dts/microchip/microchip-mpfs.dtsi | 8 +- drivers/clk/microchip/clk-mpfs.c | 205 +++++++++++++++--- .../dt-bindings/clock/microchip,mpfs-clock.h | 5 +- 6 files changed, 199 insertions(+), 46 deletions(-) -- 2.35.1
