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| author | Chen-Yu Tsai <wens@csie.org> | 2017-10-12 16:37:00 +0800 |
|---|---|---|
| committer | Maxime Ripard <maxime.ripard@free-electrons.com> | 2017-10-13 09:27:13 +0200 |
| commit | 392ba5fafcdf1969d1abd9a637cc40c45f4781bc (patch) | |
| tree | f624600dd29c6a4f8f09ea41b5ab18697496b2f9 /drivers/clk/sunxi-ng/ccu_nm.h | |
| parent | 05d2eaac96d4284b0967cc522ad22f6f23fdf82a (diff) | |
| download | talos-op-linux-392ba5fafcdf1969d1abd9a637cc40c45f4781bc.tar.gz talos-op-linux-392ba5fafcdf1969d1abd9a637cc40c45f4781bc.zip | |
clk: sunxi-ng: nm: Add support for sigma-delta modulation
Some of the N-M-style clocks, namely the PLLs, support sigma-delta
modulation to do fractional-N frequency synthesis. This is used in
the audio PLL to generate the exact frequency the audio blocks need.
These frequencies can not be generated with integer N-M factors.
Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Diffstat (limited to 'drivers/clk/sunxi-ng/ccu_nm.h')
| -rw-r--r-- | drivers/clk/sunxi-ng/ccu_nm.h | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/drivers/clk/sunxi-ng/ccu_nm.h b/drivers/clk/sunxi-ng/ccu_nm.h index e87fd186da78..c623b0c7a23c 100644 --- a/drivers/clk/sunxi-ng/ccu_nm.h +++ b/drivers/clk/sunxi-ng/ccu_nm.h @@ -20,6 +20,7 @@ #include "ccu_div.h" #include "ccu_frac.h" #include "ccu_mult.h" +#include "ccu_sdm.h" /* * struct ccu_nm - Definition of an N-M clock @@ -33,10 +34,34 @@ struct ccu_nm { struct ccu_mult_internal n; struct ccu_div_internal m; struct ccu_frac_internal frac; + struct ccu_sdm_internal sdm; struct ccu_common common; }; +#define SUNXI_CCU_NM_WITH_SDM_GATE_LOCK(_struct, _name, _parent, _reg, \ + _nshift, _nwidth, \ + _mshift, _mwidth, \ + _sdm_table, _sdm_en, \ + _sdm_reg, _sdm_reg_en, \ + _gate, _lock, _flags) \ + struct ccu_nm _struct = { \ + .enable = _gate, \ + .lock = _lock, \ + .n = _SUNXI_CCU_MULT(_nshift, _nwidth), \ + .m = _SUNXI_CCU_DIV(_mshift, _mwidth), \ + .sdm = _SUNXI_CCU_SDM(_sdm_table, _sdm_en, \ + _sdm_reg, _sdm_reg_en),\ + .common = { \ + .reg = _reg, \ + .features = CCU_FEATURE_SIGMA_DELTA_MOD, \ + .hw.init = CLK_HW_INIT(_name, \ + _parent, \ + &ccu_nm_ops, \ + _flags), \ + }, \ + } + #define SUNXI_CCU_NM_WITH_FRAC_GATE_LOCK(_struct, _name, _parent, _reg, \ _nshift, _nwidth, \ _mshift, _mwidth, \ |
