[PATCH 1/2] ASoC: bindings: fsl_spdif: Add new compatible string for imx6sx

[PATCH 1/2] ASoC: bindings: fsl_spdif: Add new compatible string for imx6sx

[Shengjiu Wang]

Add new compatible string "fsl,imx6sx-spdif" in the binding document.
And add compatible string "fsl,vf610-spdif" which was missed before.

Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
---
 Documentation/devicetree/bindings/sound/fsl,spdif.txt | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/sound/fsl,spdif.txt b/Documentation/devicetree/bindings/sound/fsl,spdif.txt
index 8b324f82a782..e1365b0ee1e9 100644
--- a/Documentation/devicetree/bindings/sound/fsl,spdif.txt
+++ b/Documentation/devicetree/bindings/sound/fsl,spdif.txt
@@ -6,7 +6,11 @@ a fibre cable.
 
 Required properties:
 
-  - compatible		: Compatible list, must contain "fsl,imx35-spdif".
+  - compatible		: Compatible list, should contain one of the following
+			  compatibles:
+			  "fsl,imx35-spdif",
+			  "fsl,vf610-spdif",
+			  "fsl,imx6sx-spdif",
 
   - reg			: Offset and length of the register set for the device.
 
-- 
2.21.0

[PATCH 2/2] ASoC: fsl_spdif: Add support for imx6sx platform

[Shengjiu Wang]

The one difference on imx6sx platform is that the root clock
is shared with ASRC module, so we add a new flags "ind_root_clk"
which means the root clock is independent, then we will not
do the clk_set_rate and clk_round_rate to avoid impact ASRC
module usage.

As add a new flags, we include the soc specific data struct.

Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
---
 sound/soc/fsl/fsl_spdif.c | 43 +++++++++++++++++++++++++++++++++++----
 1 file changed, 39 insertions(+), 4 deletions(-)

diff --git a/sound/soc/fsl/fsl_spdif.c b/sound/soc/fsl/fsl_spdif.c
index 1b2e516f9162..00e06803d32f 100644
--- a/sound/soc/fsl/fsl_spdif.c
+++ b/sound/soc/fsl/fsl_spdif.c
@@ -42,6 +42,17 @@ static u8 srpc_dpll_locked[] = { 0x0, 0x1, 0x2, 0x3, 0x4, 0xa, 0xb };
 
 #define DEFAULT_RXCLK_SRC	1
 
+/**
+ * struct fsl_spdif_soc_data: soc specific data
+ *
+ * @imx: for imx platform
+ * @ind_root_clk: flag for round clk rate
+ */
+struct fsl_spdif_soc_data {
+	bool imx;
+	bool ind_root_clk;
+};
+
 /*
  * SPDIF control structure
  * Defines channel status, subcode and Q sub
@@ -93,6 +104,7 @@ struct fsl_spdif_priv {
 	struct snd_soc_dai_driver cpu_dai_drv;
 	struct platform_device *pdev;
 	struct regmap *regmap;
+	const struct fsl_spdif_soc_data *soc;
 	bool dpll_locked;
 	u32 txrate[SPDIF_TXRATE_MAX];
 	u8 txclk_df[SPDIF_TXRATE_MAX];
@@ -110,6 +122,21 @@ struct fsl_spdif_priv {
 	u32 regcache_srpc;
 };
 
+static struct fsl_spdif_soc_data fsl_spdif_vf610 = {
+	.imx = false,
+	.ind_root_clk = true,
+};
+
+static struct fsl_spdif_soc_data fsl_spdif_imx35 = {
+	.imx = true,
+	.ind_root_clk = true,
+};
+
+static struct fsl_spdif_soc_data fsl_spdif_imx6sx = {
+	.imx = true,
+	.ind_root_clk = false,
+};
+
 /* DPLL locked and lock loss interrupt handler */
 static void spdif_irq_dpll_lock(struct fsl_spdif_priv *spdif_priv)
 {
@@ -421,7 +448,7 @@ static int spdif_set_sample_rate(struct snd_pcm_substream *substream,
 	sysclk_df = spdif_priv->sysclk_df[rate];
 
 	/* Don't mess up the clocks from other modules */
-	if (clk != STC_TXCLK_SPDIF_ROOT)
+	if (clk != STC_TXCLK_SPDIF_ROOT || !spdif_priv->soc->ind_root_clk)
 		goto clk_set_bypass;
 
 	/* The S/PDIF block needs a clock of 64 * fs * txclk_df */
@@ -1186,7 +1213,8 @@ static int fsl_spdif_probe_txclk(struct fsl_spdif_priv *spdif_priv,
 			continue;
 
 		ret = fsl_spdif_txclk_caldiv(spdif_priv, clk, savesub, index,
-					     i == STC_TXCLK_SPDIF_ROOT);
+					     i == STC_TXCLK_SPDIF_ROOT &&
+					     spdif_priv->soc->ind_root_clk);
 		if (savesub == ret)
 			continue;
 
@@ -1230,6 +1258,12 @@ static int fsl_spdif_probe(struct platform_device *pdev)
 
 	spdif_priv->pdev = pdev;
 
+	spdif_priv->soc = of_device_get_match_data(&pdev->dev);
+	if (!spdif_priv->soc) {
+		dev_err(&pdev->dev, "failed to get soc data\n");
+		return -ENODEV;
+	}
+
 	/* Initialize this copy of the CPU DAI driver structure */
 	memcpy(&spdif_priv->cpu_dai_drv, &fsl_spdif_dai, sizeof(fsl_spdif_dai));
 	spdif_priv->cpu_dai_drv.name = dev_name(&pdev->dev);
@@ -1359,8 +1393,9 @@ static const struct dev_pm_ops fsl_spdif_pm = {
 };
 
 static const struct of_device_id fsl_spdif_dt_ids[] = {
-	{ .compatible = "fsl,imx35-spdif", },
-	{ .compatible = "fsl,vf610-spdif", },
+	{ .compatible = "fsl,imx35-spdif", .data = &fsl_spdif_imx35, },
+	{ .compatible = "fsl,vf610-spdif", .data = &fsl_spdif_vf610, },
+	{ .compatible = "fsl,imx6sx-spdif", .data = &fsl_spdif_imx6sx, },
 	{}
 };
 MODULE_DEVICE_TABLE(of, fsl_spdif_dt_ids);
-- 
2.21.0

Re: [PATCH 2/2] ASoC: fsl_spdif: Add support for imx6sx platform

[Nicolin Chen]

On Tue, Jun 16, 2020 at 02:42:41PM +0800, Shengjiu Wang wrote:
> The one difference on imx6sx platform is that the root clock
> is shared with ASRC module, so we add a new flags "ind_root_clk"
> which means the root clock is independent, then we will not
> do the clk_set_rate and clk_round_rate to avoid impact ASRC
> module usage.
> 
> As add a new flags, we include the soc specific data struct.
> 
> Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
> ---
>  sound/soc/fsl/fsl_spdif.c | 43 +++++++++++++++++++++++++++++++++++----
>  1 file changed, 39 insertions(+), 4 deletions(-)
> 
> diff --git a/sound/soc/fsl/fsl_spdif.c b/sound/soc/fsl/fsl_spdif.c
> index 1b2e516f9162..00e06803d32f 100644
> --- a/sound/soc/fsl/fsl_spdif.c
> +++ b/sound/soc/fsl/fsl_spdif.c
> @@ -42,6 +42,17 @@ static u8 srpc_dpll_locked[] = { 0x0, 0x1, 0x2, 0x3, 0x4, 0xa, 0xb };
>  
>  #define DEFAULT_RXCLK_SRC	1
>  
> +/**
> + * struct fsl_spdif_soc_data: soc specific data
> + *
> + * @imx: for imx platform
> + * @ind_root_clk: flag for round clk rate
> + */
> +struct fsl_spdif_soc_data {
> +	bool imx;
> +	bool ind_root_clk;

"ind" doesn't look very straightforward; maybe "shared_root_clock"?

And for its comments:
	* @shared_root_clock: flag of sharing a clock source with others;
	*		      so the driver shouldn't set root clock rate

> +};
> +
>  /*
>   * SPDIF control structure
>   * Defines channel status, subcode and Q sub
> @@ -93,6 +104,7 @@ struct fsl_spdif_priv {
>  	struct snd_soc_dai_driver cpu_dai_drv;
>  	struct platform_device *pdev;
>  	struct regmap *regmap;
> +	const struct fsl_spdif_soc_data *soc;

Looks better if we move it to the top of the list :)

> @@ -421,7 +448,7 @@ static int spdif_set_sample_rate(struct snd_pcm_substream *substream,
>  	sysclk_df = spdif_priv->sysclk_df[rate];
>  
>  	/* Don't mess up the clocks from other modules */
> -	if (clk != STC_TXCLK_SPDIF_ROOT)
> +	if (clk != STC_TXCLK_SPDIF_ROOT || !spdif_priv->soc->ind_root_clk)
>  		goto clk_set_bypass;
>  
>  	/* The S/PDIF block needs a clock of 64 * fs * txclk_df */
> @@ -1186,7 +1213,8 @@ static int fsl_spdif_probe_txclk(struct fsl_spdif_priv *spdif_priv,
>  			continue;
>  
>  		ret = fsl_spdif_txclk_caldiv(spdif_priv, clk, savesub, index,
> -					     i == STC_TXCLK_SPDIF_ROOT);
> +					     i == STC_TXCLK_SPDIF_ROOT &&
> +					     spdif_priv->soc->ind_root_clk);

Having more than one place that checks the condition, we can add:

/* Check if clk is a root clock that does not share clock source with others */
static inline bool fsl_spdif_can_set_clk_rate(struct fsl_spdif_priv *spdif, int clk)
{
	return (clk == STC_TXCLK_SPDIF_ROOT) && !spdif->soc->shared_root_clock;
}

Re: [PATCH 2/2] ASoC: fsl_spdif: Add support for imx6sx platform

[Shengjiu Wang]

On Wed, Jun 17, 2020 at 7:30 AM Nicolin Chen <nicoleotsuka@gmail.com> wrote:
>
> On Tue, Jun 16, 2020 at 02:42:41PM +0800, Shengjiu Wang wrote:
> > The one difference on imx6sx platform is that the root clock
> > is shared with ASRC module, so we add a new flags "ind_root_clk"
> > which means the root clock is independent, then we will not
> > do the clk_set_rate and clk_round_rate to avoid impact ASRC
> > module usage.
> >
> > As add a new flags, we include the soc specific data struct.
> >
> > Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
> > ---
> >  sound/soc/fsl/fsl_spdif.c | 43 +++++++++++++++++++++++++++++++++++----
> >  1 file changed, 39 insertions(+), 4 deletions(-)
> >
> > diff --git a/sound/soc/fsl/fsl_spdif.c b/sound/soc/fsl/fsl_spdif.c
> > index 1b2e516f9162..00e06803d32f 100644
> > --- a/sound/soc/fsl/fsl_spdif.c
> > +++ b/sound/soc/fsl/fsl_spdif.c
> > @@ -42,6 +42,17 @@ static u8 srpc_dpll_locked[] = { 0x0, 0x1, 0x2, 0x3, 0x4, 0xa, 0xb };
> >
> >  #define DEFAULT_RXCLK_SRC    1
> >
> > +/**
> > + * struct fsl_spdif_soc_data: soc specific data
> > + *
> > + * @imx: for imx platform
> > + * @ind_root_clk: flag for round clk rate
> > + */
> > +struct fsl_spdif_soc_data {
> > +     bool imx;
> > +     bool ind_root_clk;
>
> "ind" doesn't look very straightforward; maybe "shared_root_clock"?
>
> And for its comments:
>         * @shared_root_clock: flag of sharing a clock source with others;
>         *                     so the driver shouldn't set root clock rate
>
> > +};
> > +
> >  /*
> >   * SPDIF control structure
> >   * Defines channel status, subcode and Q sub
> > @@ -93,6 +104,7 @@ struct fsl_spdif_priv {
> >       struct snd_soc_dai_driver cpu_dai_drv;
> >       struct platform_device *pdev;
> >       struct regmap *regmap;
> > +     const struct fsl_spdif_soc_data *soc;
>
> Looks better if we move it to the top of the list :)
>
> > @@ -421,7 +448,7 @@ static int spdif_set_sample_rate(struct snd_pcm_substream *substream,
> >       sysclk_df = spdif_priv->sysclk_df[rate];
> >
> >       /* Don't mess up the clocks from other modules */
> > -     if (clk != STC_TXCLK_SPDIF_ROOT)
> > +     if (clk != STC_TXCLK_SPDIF_ROOT || !spdif_priv->soc->ind_root_clk)
> >               goto clk_set_bypass;
> >
> >       /* The S/PDIF block needs a clock of 64 * fs * txclk_df */
> > @@ -1186,7 +1213,8 @@ static int fsl_spdif_probe_txclk(struct fsl_spdif_priv *spdif_priv,
> >                       continue;
> >
> >               ret = fsl_spdif_txclk_caldiv(spdif_priv, clk, savesub, index,
> > -                                          i == STC_TXCLK_SPDIF_ROOT);
> > +                                          i == STC_TXCLK_SPDIF_ROOT &&
> > +                                          spdif_priv->soc->ind_root_clk);
>
> Having more than one place that checks the condition, we can add:
>
> /* Check if clk is a root clock that does not share clock source with others */
> static inline bool fsl_spdif_can_set_clk_rate(struct fsl_spdif_priv *spdif, int clk)
> {
>         return (clk == STC_TXCLK_SPDIF_ROOT) && !spdif->soc->shared_root_clock;
> }

will update them in v2

best regards
wang shengjiu