diff options
| -rw-r--r-- | drivers/clk/meson/Kconfig | 5 | ||||
| -rw-r--r-- | drivers/clk/meson/Makefile | 1 | ||||
| -rw-r--r-- | drivers/clk/meson/clk-triphase.c | 68 | ||||
| -rw-r--r-- | drivers/clk/meson/clkc-audio.h | 20 |
4 files changed, 94 insertions, 0 deletions
diff --git a/drivers/clk/meson/Kconfig b/drivers/clk/meson/Kconfig index 9d00809f07fc..9ad95966aa3d 100644 --- a/drivers/clk/meson/Kconfig +++ b/drivers/clk/meson/Kconfig @@ -3,6 +3,11 @@ config COMMON_CLK_AMLOGIC depends on ARCH_MESON || COMPILE_TEST select COMMON_CLK_REGMAP_MESON +config COMMON_CLK_AMLOGIC_AUDIO + bool + depends on ARCH_MESON || COMPILE_TEST + select COMMON_CLK_AMLOGIC + config COMMON_CLK_MESON_AO bool depends on OF diff --git a/drivers/clk/meson/Makefile b/drivers/clk/meson/Makefile index 162e4a6f5c55..74ec070b0974 100644 --- a/drivers/clk/meson/Makefile +++ b/drivers/clk/meson/Makefile @@ -4,6 +4,7 @@ obj-$(CONFIG_COMMON_CLK_AMLOGIC) += clk-pll.o clk-mpll.o clk-audio-divider.o obj-$(CONFIG_COMMON_CLK_AMLOGIC) += clk-phase.o +obj-$(CONFIG_COMMON_CLK_AMLOGIC_AUDIO) += clk-triphase.o obj-$(CONFIG_COMMON_CLK_MESON_AO) += meson-aoclk.o obj-$(CONFIG_COMMON_CLK_MESON8B) += meson8b.o obj-$(CONFIG_COMMON_CLK_GXBB) += gxbb.o gxbb-aoclk.o gxbb-aoclk-32k.o diff --git a/drivers/clk/meson/clk-triphase.c b/drivers/clk/meson/clk-triphase.c new file mode 100644 index 000000000000..4a59936251e5 --- /dev/null +++ b/drivers/clk/meson/clk-triphase.c @@ -0,0 +1,68 @@ +// SPDX-License-Identifier: (GPL-2.0 OR MIT) +/* + * Copyright (c) 2018 BayLibre, SAS. + * Author: Jerome Brunet <jbrunet@baylibre.com> + */ + +#include <linux/clk-provider.h> +#include "clkc-audio.h" + +/* + * This is a special clock for the audio controller. + * The phase of mst_sclk clock output can be controlled independently + * for the outside world (ph0), the tdmout (ph1) and tdmin (ph2). + * Controlling these 3 phases as just one makes things simpler and + * give the same clock view to all the element on the i2s bus. + * If necessary, we can still control the phase in the tdm block + * which makes these independent control redundant. + */ +static inline struct meson_clk_triphase_data * +meson_clk_triphase_data(struct clk_regmap *clk) +{ + return (struct meson_clk_triphase_data *)clk->data; +} + +static void meson_clk_triphase_sync(struct clk_hw *hw) +{ + struct clk_regmap *clk = to_clk_regmap(hw); + struct meson_clk_triphase_data *tph = meson_clk_triphase_data(clk); + unsigned int val; + + /* Get phase 0 and sync it to phase 1 and 2 */ + val = meson_parm_read(clk->map, &tph->ph0); + meson_parm_write(clk->map, &tph->ph1, val); + meson_parm_write(clk->map, &tph->ph2, val); +} + +static int meson_clk_triphase_get_phase(struct clk_hw *hw) +{ + struct clk_regmap *clk = to_clk_regmap(hw); + struct meson_clk_triphase_data *tph = meson_clk_triphase_data(clk); + unsigned int val; + + /* Phase are in sync, reading phase 0 is enough */ + val = meson_parm_read(clk->map, &tph->ph0); + + return meson_clk_degrees_from_val(val, tph->ph0.width); +} + +static int meson_clk_triphase_set_phase(struct clk_hw *hw, int degrees) +{ + struct clk_regmap *clk = to_clk_regmap(hw); + struct meson_clk_triphase_data *tph = meson_clk_triphase_data(clk); + unsigned int val; + + val = meson_clk_degrees_to_val(degrees, tph->ph0.width); + meson_parm_write(clk->map, &tph->ph0, val); + meson_parm_write(clk->map, &tph->ph1, val); + meson_parm_write(clk->map, &tph->ph2, val); + + return 0; +} + +const struct clk_ops meson_clk_triphase_ops = { + .init = meson_clk_triphase_sync, + .get_phase = meson_clk_triphase_get_phase, + .set_phase = meson_clk_triphase_set_phase, +}; +EXPORT_SYMBOL_GPL(meson_clk_triphase_ops); diff --git a/drivers/clk/meson/clkc-audio.h b/drivers/clk/meson/clkc-audio.h new file mode 100644 index 000000000000..286ff1201258 --- /dev/null +++ b/drivers/clk/meson/clkc-audio.h @@ -0,0 +1,20 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (c) 2018 BayLibre, SAS. + * Author: Jerome Brunet <jbrunet@baylibre.com> + */ + +#ifndef __MESON_CLKC_AUDIO_H +#define __MESON_CLKC_AUDIO_H + +#include "clkc.h" + +struct meson_clk_triphase_data { + struct parm ph0; + struct parm ph1; + struct parm ph2; +}; + +extern const struct clk_ops meson_clk_triphase_ops; + +#endif /* __MESON_CLKC_AUDIO_H */ |