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![]() In accordance with the way the MIPS platform is normally design there are only six clock sources which need to be available on the kernel start in order to one end up booting correctly: + CPU PLL: needed by the r4k and MIPS GIC timer drivers. The former one is initialized by the arch code, while the later one is implemented in the mips-gic-timer.c driver as the OF-declared timer. + PCIe PLL: required as a parental clock source for the APB/timer domains. + APB clock: needed in order to access all the SoC CSRs at least for the timer OF-declared drivers. + APB Timer{0-2} clocks: these are the DW APB timers which drivers dw_apb_timer_of.c are implemented as the OF-declared timers. So as long as the clocks above are available early the kernel will normally work. Let's convert the Baikal-T1 CCU drivers to the platform device drivers keeping that in mind. Generally speaking the conversion isn't that complicated since the driver infrastructure has been designed as flexible enough for that. First we need to add a new PLL/Divider clock features flag which indicates the corresponding clock source as a basic one and that clock sources will be available on the kernel early boot stages. Second the internal PLL/Divider descriptors need to be initialized with -EPROBE_DEFER value as the corresponding clock source is unavailable at the early stages. They will be allocated and initialized on the Baikal-T1 clock platform driver probe procedure. Finally the already available PLL/Divider init functions need to be split up into two ones: init procedure performed in the framework of the OF-declared clock initialization (of_clk_init()), and the probe procedure called by the platform devices bus driver. Note the later method will just continue the system clocks initialization started in the former one. Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru> Link: https://lore.kernel.org/r/20220929225402.9696-9-Sergey.Semin@baikalelectronics.ru [sboyd@kernel.org: Remove module things because the Kconfig is still bool] Signed-off-by: Stephen Boyd <sboyd@kernel.org> |
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.. | ||
ccu-div.c | ||
ccu-div.h | ||
ccu-pll.c | ||
ccu-pll.h | ||
ccu-rst.c | ||
ccu-rst.h | ||
clk-ccu-div.c | ||
clk-ccu-pll.c | ||
Kconfig | ||
Makefile |