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SoC: stm32: i2s: manage clock power
Kernel clock management: Enable/disable I2S kernel clock on audio stream startup/shutdown. Peripheral clock management: Manage I2S peripheral clock power through regmap services. Signed-off-by: Olivier Moysan <olivier.moysan@st.com> Signed-off-by: Mark Brown <broonie@kernel.org>
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@ -545,9 +545,16 @@ static int stm32_i2s_startup(struct snd_pcm_substream *substream,
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struct snd_soc_dai *cpu_dai)
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{
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struct stm32_i2s_data *i2s = snd_soc_dai_get_drvdata(cpu_dai);
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int ret;
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i2s->substream = substream;
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ret = clk_prepare_enable(i2s->i2sclk);
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if (ret < 0) {
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dev_err(cpu_dai->dev, "Failed to enable clock: %d\n", ret);
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return ret;
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}
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spin_lock(&i2s->lock_fd);
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i2s->refcount++;
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spin_unlock(&i2s->lock_fd);
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@ -674,6 +681,8 @@ static void stm32_i2s_shutdown(struct snd_pcm_substream *substream,
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regmap_update_bits(i2s->regmap, STM32_I2S_CGFR_REG,
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I2S_CGFR_MCKOE, (unsigned int)~I2S_CGFR_MCKOE);
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clk_disable_unprepare(i2s->i2sclk);
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}
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static int stm32_i2s_dai_probe(struct snd_soc_dai *cpu_dai)
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@ -874,49 +883,26 @@ static int stm32_i2s_probe(struct platform_device *pdev)
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if (ret)
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return ret;
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i2s->regmap = devm_regmap_init_mmio(&pdev->dev, i2s->base,
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i2s->regmap_conf);
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i2s->regmap = devm_regmap_init_mmio_clk(&pdev->dev, "pclk",
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i2s->base, i2s->regmap_conf);
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if (IS_ERR(i2s->regmap)) {
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dev_err(&pdev->dev, "regmap init failed\n");
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return PTR_ERR(i2s->regmap);
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}
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ret = clk_prepare_enable(i2s->pclk);
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if (ret) {
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dev_err(&pdev->dev, "Enable pclk failed: %d\n", ret);
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return ret;
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}
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ret = clk_prepare_enable(i2s->i2sclk);
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if (ret) {
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dev_err(&pdev->dev, "Enable i2sclk failed: %d\n", ret);
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goto err_pclk_disable;
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}
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ret = devm_snd_soc_register_component(&pdev->dev, &stm32_i2s_component,
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i2s->dai_drv, 1);
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if (ret)
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goto err_clocks_disable;
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return ret;
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ret = devm_snd_dmaengine_pcm_register(&pdev->dev,
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&stm32_i2s_pcm_config, 0);
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if (ret)
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goto err_clocks_disable;
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return ret;
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/* Set SPI/I2S in i2s mode */
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ret = regmap_update_bits(i2s->regmap, STM32_I2S_CGFR_REG,
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I2S_CGFR_I2SMOD, I2S_CGFR_I2SMOD);
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if (ret)
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goto err_clocks_disable;
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return ret;
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err_clocks_disable:
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clk_disable_unprepare(i2s->i2sclk);
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err_pclk_disable:
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clk_disable_unprepare(i2s->pclk);
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return ret;
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return regmap_update_bits(i2s->regmap, STM32_I2S_CGFR_REG,
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I2S_CGFR_I2SMOD, I2S_CGFR_I2SMOD);
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}
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static int stm32_i2s_remove(struct platform_device *pdev)
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