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| author | Martin Blumenstingl <martin.blumenstingl@googlemail.com> | 2017-05-04 21:19:20 +0300 |
|---|---|---|
| committer | Jerome Brunet <jbrunet@baylibre.com> | 2017-05-29 15:33:50 +0300 |
| commit | 96b61c8d2eae247661ac5a7dfba21e1a858400d1 (patch) | |
| tree | 26abae08e8f4a6d668c4b71003eb34b6bdd2418a /drivers/clk/meson/gxbb.h | |
| parent | f40a8ce96ae141f5ec83204471df4902e86a572c (diff) | |
| download | linux-96b61c8d2eae247661ac5a7dfba21e1a858400d1.tar.xz | |
clk: meson: gxbb: remove the "cpu_clk" from the GXBB and GXL driver
It seems that the "cpu_clk" was carried over from the meson8b clock
controller driver. On Meson GX (GXBB/GXL/GXM) the registers which are
used by the cpu_clk have a different purpose (in other words: they don't
control the CPU clock anymore). HHI_SYS_CPU_CLK_CNTL1 bits 31:24 are
reserved according to the public S905 datasheet, while bit 23 is the
"A53_trace_clk_DIS" gate (which according to the datasheet should only
be used in case a silicon bug is discovered) and bits 22:20 are a
divider (A53_trace_clk). The meson clk-cpu code however expects that
bits 28:20 are reserved for a divider (according to the public S805
datasheet this "SCALE_DIV: This value represents an N+1 divider of the
input clock.").
The CPU clock on Meson GX SoCs is provided by the SCPI DVFS clock
driver instead. Two examples from a Meson GXL S905X SoC:
- vcpu (SCPI DVFS clock 0) rate: 1000000000 / cpu_clk rate: 708000000
- vcpu (SCPI DVFS clock 0) rate: 1512000000 / cpu_clk rate: 708000000
Unfortunately the CLKID_CPUCLK was already exported (but is currently
not used) to DT. Due to the removal of this clock definition there is
now a hole in the clk_hw_onecell_data (which is not a problem because
this case is already handled in gxbb_clkc_probe).
Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Diffstat (limited to 'drivers/clk/meson/gxbb.h')
| -rw-r--r-- | drivers/clk/meson/gxbb.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/clk/meson/gxbb.h b/drivers/clk/meson/gxbb.h index 4d04f4a3cd59..70f029a518c0 100644 --- a/drivers/clk/meson/gxbb.h +++ b/drivers/clk/meson/gxbb.h @@ -171,7 +171,7 @@ * to be exposed to client nodes in DT: include/dt-bindings/clock/gxbb-clkc.h */ #define CLKID_SYS_PLL 0 -#define CLKID_CPUCLK 1 +/* ID 1 is unused (it was used by the non-existing CLKID_CPUCLK before) */ /* CLKID_HDMI_PLL */ #define CLKID_FIXED_PLL 3 /* CLKID_FCLK_DIV2 */ |