Hi, this patch-set adds Z and Z2 clock support. These are dependencies for supporting CPUFreq. The remainder of that work is being posted separately and can be found at: https://git.kernel.org/pub/scm/linux/kernel/git/horms/renesas.git topic/rcar-gen3-cpufreq-v5 Based on v4.15-rc1 Changes since v4: * Correct off-by one error in usage of __ffs Changes since v3: * Rebase * Divide parent clock by 2 to give correct rate (again) * Take care not to overflow multiplication on 32 but platforms * Use __ffs as FIELD_{GET,PREP} don't not work with non-constant masks * Use correct mask in cpg_z_clk_recalc_rate() Changes since v2: * Rebase * Address review of v2 as noted in patch changelogs Takeshi Kihara (6): clk: renesas: rcar-gen3: Add Z clock divider support clk: renesas: rcar-gen3: Add Z2 clock divider support clk: renesas: r8a7795: Add Z clock clk: renesas: r8a7795: Add Z2 clock clk: renesas: r8a7796: Add Z clock clk: renesas: r8a7796: Add Z2 clock drivers/clk/renesas/r8a7795-cpg-mssr.c | 2 + drivers/clk/renesas/r8a7796-cpg-mssr.c | 2 + drivers/clk/renesas/rcar-gen3-cpg.c | 143 +++++++++++++++++++++++++++++++++ drivers/clk/renesas/rcar-gen3-cpg.h | 2 + 4 files changed, 149 insertions(+) Results of testing this on an H3 ES2.0 / Salvator-XS are as below. Testing has shown equivalent results on an M3W ES1.0 / Salvator-X. Testing has also shown equivalent results on an H3 ES1.0 / Salvator-X with the following restrictions due to lack of physical access: 1. No little CPUs are brought up and thus scaling the frequency of those CPUs was not tested 2. No Suspend-to-RAM The results for H3 ES2.0 / Salvator-XS: On Boot ------- Z clock is half of pll0 and corresponds to CPU frequency. Z2 clock is half pll2. This is as expected. # cd /sys/devices/system/cpu/ # grep -E -w "pll[02]|z|z2" /sys/kernel/debug/clk/clk_summary .pll2 0 0 2396160000 0 0 z2 0 0 1198080000 0 0 .pll0 0 0 2995200000 0 0 z 0 0 1497600000 0 0 # grep . cpu*/cpufreq/*cur* cpu0/cpufreq/cpuinfo_cur_freq:1497600 cpu0/cpufreq/scaling_cur_freq:1497600 cpu1/cpufreq/cpuinfo_cur_freq:1497600 cpu1/cpufreq/scaling_cur_freq:1497600 cpu2/cpufreq/cpuinfo_cur_freq:1497600 cpu2/cpufreq/scaling_cur_freq:1497600 cpu3/cpufreq/cpuinfo_cur_freq:1497600 cpu3/cpufreq/scaling_cur_freq:1497600 cpu4/cpufreq/cpuinfo_cur_freq:1198080 cpu4/cpufreq/scaling_cur_freq:1198080 cpu5/cpufreq/cpuinfo_cur_freq:1198080 cpu5/cpufreq/scaling_cur_freq:1198080 cpu6/cpufreq/cpuinfo_cur_freq:1198080 cpu6/cpufreq/scaling_cur_freq:1198080 cpu7/cpufreq/cpuinfo_cur_freq:1198080 cpu7/cpufreq/scaling_cur_freq:1198080 BIG CPU Freq scaled to 500000 and little CPU Freq scaled to 800000 ------------------------------------------------------------------ Z and Z2 clocks corresponds to new CPU frequencies. PLL0 and PLL2 are unchanged. This is the expected result. # echo 500000 > cpu0/cpufreq/scaling_max_freq # echo 800000 > cpu4/cpufreq/scaling_max_freq # grep -E -w "pll[02]|z|z2" /sys/kernel/debug/clk/clk_summary .pll2 0 0 2396160000 0 0 z2 0 0 786240000 0 0 .pll0 0 0 2995200000 0 0 z 0 0 468000000 0 0 # grep . cpu*/cpufreq/*cur* cpu0/cpufreq/cpuinfo_cur_freq:468000 cpu0/cpufreq/scaling_cur_freq:468000 cpu1/cpufreq/cpuinfo_cur_freq:468000 cpu1/cpufreq/scaling_cur_freq:468000 cpu2/cpufreq/cpuinfo_cur_freq:468000 cpu2/cpufreq/scaling_cur_freq:468000 cpu3/cpufreq/cpuinfo_cur_freq:468000 cpu3/cpufreq/scaling_cur_freq:468000 cpu4/cpufreq/cpuinfo_cur_freq:786240 cpu4/cpufreq/scaling_cur_freq:786240 cpu5/cpufreq/cpuinfo_cur_freq:786240 cpu5/cpufreq/scaling_cur_freq:786240 cpu6/cpufreq/cpuinfo_cur_freq:786240 cpu6/cpufreq/scaling_cur_freq:786240 cpu7/cpufreq/cpuinfo_cur_freq:786240 cpu7/cpufreq/scaling_cur_freq:786240 After Resume from Suspend-to-RAM -------------------------------- Clocks and CPU freqiencies are restored to their values before suspend. This is the expected result. # grep -E -w "pll[02]|z|z2" /sys/kernel/debug/clk/clk_summary .pll2 0 0 2396160000 0 0 z2 0 0 786240000 0 0 .pll0 0 0 2995200000 0 0 z 0 0 468000000 0 0 # grep . cpu*/cpufreq/*cur* cpu0/cpufreq/cpuinfo_cur_freq:468000 cpu0/cpufreq/scaling_cur_freq:500000 cpu1/cpufreq/cpuinfo_cur_freq:468000 cpu1/cpufreq/scaling_cur_freq:500000 cpu2/cpufreq/cpuinfo_cur_freq:468000 cpu2/cpufreq/scaling_cur_freq:500000 cpu3/cpufreq/cpuinfo_cur_freq:468000 cpu3/cpufreq/scaling_cur_freq:500000 cpu4/cpufreq/cpuinfo_cur_freq:786240 cpu4/cpufreq/scaling_cur_freq:800000 cpu5/cpufreq/cpuinfo_cur_freq:786240 cpu5/cpufreq/scaling_cur_freq:800000 cpu6/cpufreq/cpuinfo_cur_freq:786240 cpu6/cpufreq/scaling_cur_freq:800000 cpu7/cpufreq/cpuinfo_cur_freq:786240 cpu7/cpufreq/scaling_cur_freq:800000 -- 2.11.0
