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- // 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);
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