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-v4 Based on v4.15-rc1 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 the Salvator-X r8a7796 are as follows: On Boot ------- Z clock is half of pll0 and corresponds to CPU frequency. Z2 clock is half pll2. This is as expected. root@Debian:~# cd /sys/devices/system/cpu/cpu0/cpufreq root@Debian:/sys/devices/system/cpu/cpu0/cpufreq# grep -E -w "pll0|z" /sys/kernel/debug/clk/clk_summary; grep -E -w "pll2|z2" /sys/kernel/debug/clk/clk_summary; grep . *cur* .pll0 0 0 2999999880 0 0 z 0 0 1499999940 0 0 .pll2 0 0 2399999904 0 0 z2 0 0 1199999952 0 0 cpuinfo_cur_freq:1499999 scaling_cur_freq:1500000 CPU Freq scaled to 1000000 and then 500000 ------------------------------------------ Z clock corresponds to new CPU frequency. Z2 clock, PLL0 and PLL2 are unchanged. This is also as expected. root@Debian:/sys/devices/system/cpu/cpu0/cpufreq# echo 1000000 > scaling_max_freq root@Debian:/sys/devices/system/cpu/cpu0/cpufreq# grep -E -w "pll0|z" /sys/kernel/debug/clk/clk_summary; grep -E -w "pll2|z2" /sys/kernel/debug/clk/clk_summary; grep . *cur* grep . *cur*lk_summary; grep -E -w "pll2|z2" /sys/kernel/debug/clk/clk_summary; .pll0 0 0 2999999880 0 0 z 0 0 1031249959 0 0 .pll2 0 0 2399999904 0 0 z2 0 0 1199999952 0 0 cpuinfo_cur_freq:1031249 scaling_cur_freq:1000000 root@Debian:/sys/devices/system/cpu/cpu0/cpufreq# echo 500000 > scaling_max_freq root@Debian:/sys/devices/system/cpu/cpu0/cpufreq# grep -E -w "pll0|z" /sys/kernel/debug/clk/clk_summary; grep -E -w "pll2|z2" /sys/kernel/debug/clk/clk_summary; grep . *cur* .pll0 0 0 2999999880 0 0 z 0 0 468749981 0 0 .pll2 0 0 2399999904 0 0 z2 0 0 1199999952 0 0 cpuinfo_cur_freq:468749 scaling_cur_freq:500000
