> Subject: [PATCH v4] ASoC: fsl_sai: Add clock controls for SAI
>
> The SAI mainly has the following clocks:
> bus clock
> control and configure registers and to generate synchronous
> interrupts and DMA requests.
>
> mclk1, mclk2, mclk3
> to generate the bit clock when the receiver or transmitter is
> configured for an internally generated bit clock.
>
> So this patch adds these clocks and their clock controls to the driver,
> meanwhile, corrects the existing DTS accordingly so those platforms can
> benifit from the further feature with different clock sources.
>
> Signed-off-by: Nicolin Chen <Guangyu.Chen@xxxxxxxxxxxxx>
> CC: Xiubo Li <Li.Xiubo@xxxxxxxxxxxxx>
> Acked-by: Shawn Guo <shawn.guo@xxxxxxxxxx>
> ---
>
> @Xiubo
> Even though you've tested it before, I'd still like to wait for your test
> result to this newer version.
>
> Changelog
> v4:
> * Merged into single patch.
> * Fixed bus clock ID on vf610.
> v3:
> * Use int type for ret instead of u32.
> * Added Acked-by and Tested-by from Xiubo Li.
> v2:
> * Appended two extra mclks to the driver since SAI actually has three.
> * Renamed clock name to 'bus' and 'mclk' according to the reference manual.
>
> .../devicetree/bindings/sound/fsl-sai.txt | 9 ++--
> arch/arm/boot/dts/vf610.dtsi | 6 ++-
> sound/soc/fsl/fsl_sai.c | 51 ++++++++++++++++++++-
> -
> sound/soc/fsl/fsl_sai.h | 4 ++
> 4 files changed, 61 insertions(+), 9 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/sound/fsl-sai.txt
> b/Documentation/devicetree/bindings/sound/fsl-sai.txt
> index 35c09fe..0f4e238 100644
> --- a/Documentation/devicetree/bindings/sound/fsl-sai.txt
> +++ b/Documentation/devicetree/bindings/sound/fsl-sai.txt
> @@ -10,7 +10,8 @@ Required properties:
> - compatible: Compatible list, contains "fsl,vf610-sai" or "fsl,imx6sx-sai".
> - reg: Offset and length of the register set for the device.
> - clocks: Must contain an entry for each entry in clock-names.
> -- clock-names : Must include the "sai" entry.
> +- clock-names : Must include the "bus" for register access and "mclk1"
> "mclk2"
> + "mclk3" for bit clock and frame clock providing.
> - dmas : Generic dma devicetree binding as described in
> Documentation/devicetree/bindings/dma/dma.txt.
> - dma-names : Two dmas have to be defined, "tx" and "rx".
> @@ -30,8 +31,10 @@ sai2: sai@40031000 {
> reg = <0x40031000 0x1000>;
> pinctrl-names = "default";
> pinctrl-0 = <&pinctrl_sai2_1>;
> - clocks = <&clks VF610_CLK_SAI2>;
> - clock-names = "sai";
> + clocks = <&clks VF610_CLK_PLATFORM_BUS>,
> + <&clks VF610_CLK_SAI2>,
> + <&clks 0>, <&clks 0>;
> + clock-names = "bus", "mclk1", "mclk2", "mclk3";
> dma-names = "tx", "rx";
> dmas = <&edma0 0 VF610_EDMA_MUXID0_SAI2_TX>,
> <&edma0 0 VF610_EDMA_MUXID0_SAI2_RX>;
> diff --git a/arch/arm/boot/dts/vf610.dtsi b/arch/arm/boot/dts/vf610.dtsi
> index d31ce1b..4c3cd59 100644
> --- a/arch/arm/boot/dts/vf610.dtsi
> +++ b/arch/arm/boot/dts/vf610.dtsi
> @@ -139,8 +139,10 @@
> compatible = "fsl,vf610-sai";
> reg = <0x40031000 0x1000>;
> interrupts = <0 86 0x04>;
> - clocks = <&clks VF610_CLK_SAI2>;
> - clock-names = "sai";
> + clocks = <&clks VF610_CLK_PLATFORM_BUS>,
> + <&clks VF610_CLK_SAI2>,
> + <&clks 0>, <&clks 0>;
> + clock-names = "bus", "mclk1", "mclk2", "mclk3";
Yes, this okey for Vybrid.
On Vybrid, only the 'bus' and 'mclk1' are present, and the 'bus' clock is
Enable by default.
> status = "disabled";
> };
>
> diff --git a/sound/soc/fsl/fsl_sai.c b/sound/soc/fsl/fsl_sai.c
> index db9f75e..7cd4af9 100644
> --- a/sound/soc/fsl/fsl_sai.c
> +++ b/sound/soc/fsl/fsl_sai.c
> @@ -401,7 +401,23 @@ static int fsl_sai_startup(struct snd_pcm_substream
> *substream,
> struct snd_soc_dai *cpu_dai)
> {
> struct fsl_sai *sai = snd_soc_dai_get_drvdata(cpu_dai);
> - u32 reg;
> + struct device *dev = &sai->pdev->dev;
> + u32 reg, i;
> + int ret;
> +
> + ret = clk_prepare_enable(sai->bus_clk);
> + if (ret) {
> + dev_err(dev, "failed to enable bus clock\n");
> + return ret;
> + }
> +
> + for (i = 0; i < FSL_SAI_MCLK_MAX; i++) {
> + ret = clk_prepare_enable(sai->mclk_clk[i]);
> + if (ret) {
> + dev_err(dev, "failed to enable mclk%d clock\n", i + 1);
> + goto err;
> + }
> + }
>
Why prepare and enable all the mclks here ?
And at last only one of 'bus', 'mclk1', 'mclk2' and 'mclk3' will be selected
To generate the bit clock. How about just prepare and enable the selected
one ?
> if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
> reg = FSL_SAI_TCR3;
> @@ -412,13 +428,20 @@ static int fsl_sai_startup(struct snd_pcm_substream
> *substream,
> FSL_SAI_CR3_TRCE);
>
> return 0;
> +
> +err:
> + for (; i > 0; i--)
> + clk_disable_unprepare(sai->mclk_clk[i - 1]);
> + clk_disable_unprepare(sai->bus_clk);
> +
> + return ret;
> }
>
> static void fsl_sai_shutdown(struct snd_pcm_substream *substream,
> struct snd_soc_dai *cpu_dai)
> {
> struct fsl_sai *sai = snd_soc_dai_get_drvdata(cpu_dai);
> - u32 reg;
> + u32 reg, i;
>
> if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
> reg = FSL_SAI_TCR3;
> @@ -427,6 +450,10 @@ static void fsl_sai_shutdown(struct snd_pcm_substream
> *substream,
>
> regmap_update_bits(sai->regmap, reg, FSL_SAI_CR3_TRCE,
> ~FSL_SAI_CR3_TRCE);
> +
> + for (i = 0; i < FSL_SAI_MCLK_MAX; i++)
> + clk_disable_unprepare(sai->mclk_clk[i]);
> + clk_disable_unprepare(sai->bus_clk);
> }
>
> static const struct snd_soc_dai_ops fsl_sai_pcm_dai_ops = {
> @@ -559,7 +586,8 @@ static int fsl_sai_probe(struct platform_device *pdev)
> struct fsl_sai *sai;
> struct resource *res;
> void __iomem *base;
> - int irq, ret;
> + char tmp[8];
> + int irq, ret, i;
>
> sai = devm_kzalloc(&pdev->dev, sizeof(*sai), GFP_KERNEL);
> if (!sai)
> @@ -582,12 +610,27 @@ static int fsl_sai_probe(struct platform_device *pdev)
> return PTR_ERR(base);
>
> sai->regmap = devm_regmap_init_mmio_clk(&pdev->dev,
> - "sai", base, &fsl_sai_regmap_config);
> + "bus", base, &fsl_sai_regmap_config);
> if (IS_ERR(sai->regmap)) {
> dev_err(&pdev->dev, "regmap init failed\n");
> return PTR_ERR(sai->regmap);
> }
>
> + sai->bus_clk = devm_clk_get(&pdev->dev, "bus");
> + if (IS_ERR(sai->bus_clk)) {
> + dev_err(&pdev->dev, "failed to get bus clock\n");
> + return PTR_ERR(sai->bus_clk);
> + }
> +
> + for (i = 0; i < FSL_SAI_MCLK_MAX; i++) {
> + sprintf(tmp, "mclk%d", i + 1);
> + sai->mclk_clk[i] = devm_clk_get(&pdev->dev, tmp);
> + if (IS_ERR(sai->mclk_clk[i])) {
> + dev_err(&pdev->dev, "failed to get mclk%d clock\n", i + 1);
> + return PTR_ERR(sai->mclk_clk[i]);
> + }
> + }
> +
> irq = platform_get_irq(pdev, 0);
> if (irq < 0) {
> dev_err(&pdev->dev, "no irq for node %s\n", np->full_name);
> diff --git a/sound/soc/fsl/fsl_sai.h b/sound/soc/fsl/fsl_sai.h
> index 677670d..0e6c9f5 100644
> --- a/sound/soc/fsl/fsl_sai.h
> +++ b/sound/soc/fsl/fsl_sai.h
> @@ -119,6 +119,8 @@
> #define FSL_SAI_CLK_MAST2 2
> #define FSL_SAI_CLK_MAST3 3
>
> +#define FSL_SAI_MCLK_MAX 3
> +
> /* SAI data transfer numbers per DMA request */
> #define FSL_SAI_MAXBURST_TX 6
> #define FSL_SAI_MAXBURST_RX 6
> @@ -126,6 +128,8 @@
> struct fsl_sai {
> struct platform_device *pdev;
> struct regmap *regmap;
> + struct clk *bus_clk;
> + struct clk *mclk_clk[FSL_SAI_MCLK_MAX];
>
> bool big_endian_regs;
> bool big_endian_data;
> --
> 1.8.4
>
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