69 lines
2.1 KiB
C
Executable file
69 lines
2.1 KiB
C
Executable file
// SPDX-License-Identifier: (GPL-2.0 OR MIT)
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/*
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* Copyright (c) 2018 BayLibre, SAS.
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* Author: Jerome Brunet <jbrunet@baylibre.com>
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*/
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#include <linux/clk-provider.h>
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#include "clkc-audio.h"
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/*
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* This is a special clock for the audio controller.
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* The phase of mst_sclk clock output can be controlled independently
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* for the outside world (ph0), the tdmout (ph1) and tdmin (ph2).
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* Controlling these 3 phases as just one makes things simpler and
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* give the same clock view to all the element on the i2s bus.
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* If necessary, we can still control the phase in the tdm block
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* which makes these independent control redundant.
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*/
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static inline struct meson_clk_triphase_data *
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meson_clk_triphase_data(struct clk_regmap *clk)
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{
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return (struct meson_clk_triphase_data *)clk->data;
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}
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static void meson_clk_triphase_sync(struct clk_hw *hw)
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{
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struct clk_regmap *clk = to_clk_regmap(hw);
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struct meson_clk_triphase_data *tph = meson_clk_triphase_data(clk);
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unsigned int val;
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/* Get phase 0 and sync it to phase 1 and 2 */
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val = meson_parm_read(clk->map, &tph->ph0);
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meson_parm_write(clk->map, &tph->ph1, val);
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meson_parm_write(clk->map, &tph->ph2, val);
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}
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static int meson_clk_triphase_get_phase(struct clk_hw *hw)
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{
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struct clk_regmap *clk = to_clk_regmap(hw);
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struct meson_clk_triphase_data *tph = meson_clk_triphase_data(clk);
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unsigned int val;
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/* Phase are in sync, reading phase 0 is enough */
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val = meson_parm_read(clk->map, &tph->ph0);
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return meson_clk_degrees_from_val(val, tph->ph0.width);
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}
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static int meson_clk_triphase_set_phase(struct clk_hw *hw, int degrees)
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{
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struct clk_regmap *clk = to_clk_regmap(hw);
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struct meson_clk_triphase_data *tph = meson_clk_triphase_data(clk);
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unsigned int val;
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val = meson_clk_degrees_to_val(degrees, tph->ph0.width);
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meson_parm_write(clk->map, &tph->ph0, val);
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meson_parm_write(clk->map, &tph->ph1, val);
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meson_parm_write(clk->map, &tph->ph2, val);
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return 0;
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}
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const struct clk_ops meson_clk_triphase_ops = {
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.init = meson_clk_triphase_sync,
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.get_phase = meson_clk_triphase_get_phase,
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.set_phase = meson_clk_triphase_set_phase,
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};
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EXPORT_SYMBOL_GPL(meson_clk_triphase_ops);
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