From: Daniel Baluta <daniel.baluta@nxp.com>

We need this to signal that DAI link supports only 1 direction that
can only be either playback or capture.

Signed-off-by: Daniel Baluta <daniel.baluta@nxp.com>
---
 include/sound/simple_card_utils.h     |  5 +++++
 sound/soc/generic/simple-card-utils.c | 27 +++++++++++++++++++++++++++
 sound/soc/generic/simple-card.c       | 10 ++++++++++
 3 files changed, 42 insertions(+)

diff --git a/include/sound/simple_card_utils.h b/include/sound/simple_card_utils.h
index d1a95bc33c56..47d90edaf6fe 100644
--- a/include/sound/simple_card_utils.h
+++ b/include/sound/simple_card_utils.h
@@ -135,6 +135,11 @@ int asoc_simple_parse_daifmt(struct device *dev,
 			     struct device_node *codec,
 			     char *prefix,
 			     unsigned int *retfmt);
+int asoc_simple_parse_link_direction(struct device *dev,
+				     struct device_node *node,
+				     char *prefix,
+				     bool *is_playback_only,
+				     bool *is_capture_only);
 int asoc_simple_parse_tdm_width_map(struct device *dev, struct device_node *np,
 				    struct asoc_simple_dai *dai);
 
diff --git a/sound/soc/generic/simple-card-utils.c b/sound/soc/generic/simple-card-utils.c
index 5b18a4af022f..e04d2995cf0b 100644
--- a/sound/soc/generic/simple-card-utils.c
+++ b/sound/soc/generic/simple-card-utils.c
@@ -115,6 +115,33 @@ int asoc_simple_parse_daifmt(struct device *dev,
 }
 EXPORT_SYMBOL_GPL(asoc_simple_parse_daifmt);
 
+int asoc_simple_parse_link_direction(struct device *dev, struct device_node *node, char *prefix,
+				     bool *playback_only, bool *capture_only)
+{
+	bool is_playback_only = false;
+	bool is_capture_only = false;
+
+	if (!prefix)
+		prefix = "";
+
+	if (of_property_read_bool(node, "playback-only"))
+		is_playback_only = true;
+
+	if (of_property_read_bool(node, "capture-only"))
+		is_capture_only = true;
+
+	if (is_playback_only && is_capture_only) {
+		dev_err(dev, "Invalid configuration, both playback-only / capture-only are set\n");
+		return -EINVAL;
+	}
+
+	*playback_only = is_playback_only;
+	*capture_only = is_capture_only;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(asoc_simple_parse_link_direction);
+
 int asoc_simple_parse_tdm_width_map(struct device *dev, struct device_node *np,
 				    struct asoc_simple_dai *dai)
 {
diff --git a/sound/soc/generic/simple-card.c b/sound/soc/generic/simple-card.c
index 190f11366e84..1fb34a51636d 100644
--- a/sound/soc/generic/simple-card.c
+++ b/sound/soc/generic/simple-card.c
@@ -195,6 +195,7 @@ static int simple_link_init(struct asoc_simple_priv *priv,
 {
 	struct device *dev = simple_priv_to_dev(priv);
 	struct snd_soc_dai_link *dai_link = simple_priv_to_link(priv, li->link);
+	bool is_playback_only, is_capture_only;
 	int ret;
 
 	ret = asoc_simple_parse_daifmt(dev, node, codec,
@@ -202,6 +203,15 @@ static int simple_link_init(struct asoc_simple_priv *priv,
 	if (ret < 0)
 		return 0;
 
+	ret = asoc_simple_parse_link_direction(dev, node, prefix,
+					       &is_playback_only,
+					       &is_capture_only);
+	if (ret < 0)
+		return 0;
+
+	dai_link->playback_only = is_playback_only;
+	dai_link->capture_only = is_capture_only;
+
 	dai_link->init			= asoc_simple_dai_init;
 	dai_link->ops			= &simple_ops;
 
-- 
2.25.1

Hi Daniel

Thank you for your patch.
This is not a big deal, but...

> We need this to signal that DAI link supports only 1 direction that
> can only be either playback or capture.
(snip)
> +	if (of_property_read_bool(node, "playback-only"))
> +		is_playback_only = true;
> +
> +	if (of_property_read_bool(node, "capture-only"))
> +		is_capture_only = true;

More simply

	is_playback_only = of_property_read_bool(node, "playback-only");
	is_capture_only  = of_property_read_bool(node, "capture-only");

> +	ret = asoc_simple_parse_link_direction(dev, node, prefix,
> +					       &is_playback_only,
> +					       &is_capture_only);
> +	if (ret < 0)
> +		return 0;
> +
> +	dai_link->playback_only = is_playback_only;
> +	dai_link->capture_only = is_capture_only;

It doesn't overwrite when error case, so
More simply

	ret = asoc_simple_parse_link_direction(dev, node, prefix,
						&dai_link->playback_only,
						&dai_link->capture_only);


Thank you for your help !!

Best regards
---
Kuninori Morimoto

On Wed, Aug 2, 2023 at 2:31 AM Kuninori Morimoto
<kuninori.morimoto.gx@renesas.com> wrote:
>
>
> Hi Daniel
>
> Thank you for your patch.
> This is not a big deal, but...
>
> > We need this to signal that DAI link supports only 1 direction that
> > can only be either playback or capture.
> (snip)
> > +     if (of_property_read_bool(node, "playback-only"))
> > +             is_playback_only = true;
> > +
> > +     if (of_property_read_bool(node, "capture-only"))
> > +             is_capture_only = true;
>
> More simply
>
>         is_playback_only = of_property_read_bool(node, "playback-only");
>         is_capture_only  = of_property_read_bool(node, "capture-only");


Good point. Will fix in v2.

>
> > +     ret = asoc_simple_parse_link_direction(dev, node, prefix,
> > +                                            &is_playback_only,
> > +                                            &is_capture_only);
> > +     if (ret < 0)
> > +             return 0;
> > +
> > +     dai_link->playback_only = is_playback_only;
> > +     dai_link->capture_only = is_capture_only;
>
> It doesn't overwrite when error case, so
> More simply
>
>         ret = asoc_simple_parse_link_direction(dev, node, prefix,
>                                                 &dai_link->playback_only,
>                                                 &dai_link->capture_only);

Can do this because dai_link->playback_only is a bitfield.