diff options
| author | Chunyan Zhang <chunyan.zhang@unisoc.com> | 2020-05-27 13:36:35 +0800 |
|---|---|---|
| committer | Stephen Boyd <sboyd@kernel.org> | 2020-05-26 23:41:14 -0700 |
| commit | 8b4f6b8d59c614477ce65da15a4f5ddc31b2c398 (patch) | |
| tree | 6ce63204cf6ca568ebbbf41c12cf746cbe009cdf /drivers/clk/sprd/gate.h | |
| parent | c2f30986d418f26abefc2eec90ebf06716c970d2 (diff) | |
| download | linux-8b4f6b8d59c614477ce65da15a4f5ddc31b2c398.tar.bz2 | |
clk: sprd: check its parent status before reading gate clock
Some clocks only can be accessed if their parent is enabled. mipi_csi_xx
clocks on SC9863A are an examples. We have to ensure the parent clock is
enabled when reading those clocks.
Signed-off-by: Chunyan Zhang <chunyan.zhang@unisoc.com>
Link: https://lkml.kernel.org/r/20200527053638.31439-2-zhang.lyra@gmail.com
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
Diffstat (limited to 'drivers/clk/sprd/gate.h')
| -rw-r--r-- | drivers/clk/sprd/gate.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/clk/sprd/gate.h b/drivers/clk/sprd/gate.h index b55817869367..e738dafa4fe9 100644 --- a/drivers/clk/sprd/gate.h +++ b/drivers/clk/sprd/gate.h @@ -19,6 +19,15 @@ struct sprd_gate { struct sprd_clk_common common; }; +/* + * sprd_gate->flags is used for: + * CLK_GATE_SET_TO_DISABLE BIT(0) + * CLK_GATE_HIWORD_MASK BIT(1) + * CLK_GATE_BIG_ENDIAN BIT(2) + * so we define new flags from BIT(3) + */ +#define SPRD_GATE_NON_AON BIT(3) /* not alway powered on, check before read */ + #define SPRD_SC_GATE_CLK_HW_INIT_FN(_struct, _name, _parent, _reg, \ _sc_offset, _enable_mask, _flags, \ _gate_flags, _udelay, _ops, _fn) \ |