[PATCH 4/9] ASoC: mediatek: mt2701: add optional HDMI audio path clocks

[Daniel Golle]

The HDMI audio output path on MT2701/MT7623N is rooted in HADDS2PLL
and gated by the audio_hdmi, audio_spdf and audio_apll power gates.
Acquire these four clocks from device tree using devm_clk_get_optional
so that existing platforms which do not wire up HDMI audio keep
probing unchanged. Actual clock enable/prepare is deferred to the
upcoming HDMI DAI startup path.

Signed-off-by: Daniel Golle <daniel at makrotopia.org>
---
 .../mediatek/mt2701/mt2701-afe-clock-ctrl.c   | 22 +++++++++++++++++++
 sound/soc/mediatek/mt2701/mt2701-afe-common.h |  4 ++++
 2 files changed, 26 insertions(+)

diff --git a/sound/soc/mediatek/mt2701/mt2701-afe-clock-ctrl.c b/sound/soc/mediatek/mt2701/mt2701-afe-clock-ctrl.c
index ae620890bb3ac..5a2bcf027b4fb 100644
--- a/sound/soc/mediatek/mt2701/mt2701-afe-clock-ctrl.c
+++ b/sound/soc/mediatek/mt2701/mt2701-afe-clock-ctrl.c
@@ -95,6 +95,28 @@ int mt2701_init_clock(struct mtk_base_afe *afe)
 		afe_priv->mrgif_ck = NULL;
 	}
 
+	/*
+	 * Optional HDMI audio clocks. Platforms that do not wire up the
+	 * HDMI output (e.g. MT2701 devkits using only the I2S BE DAIs)
+	 * may omit these; in that case the HDMI BE DAI simply cannot be
+	 * enabled, but the rest of the AFE still probes.
+	 */
+	afe_priv->hadds2pll_ck = devm_clk_get_optional(afe->dev, "hadds2pll_294m");
+	if (IS_ERR(afe_priv->hadds2pll_ck))
+		return PTR_ERR(afe_priv->hadds2pll_ck);
+
+	afe_priv->audio_hdmi_ck = devm_clk_get_optional(afe->dev, "audio_hdmi_pd");
+	if (IS_ERR(afe_priv->audio_hdmi_ck))
+		return PTR_ERR(afe_priv->audio_hdmi_ck);
+
+	afe_priv->audio_spdf_ck = devm_clk_get_optional(afe->dev, "audio_spdf_pd");
+	if (IS_ERR(afe_priv->audio_spdf_ck))
+		return PTR_ERR(afe_priv->audio_spdf_ck);
+
+	afe_priv->audio_apll_ck = devm_clk_get_optional(afe->dev, "audio_apll_pd");
+	if (IS_ERR(afe_priv->audio_apll_ck))
+		return PTR_ERR(afe_priv->audio_apll_ck);
+
 	return 0;
 }
 
diff --git a/sound/soc/mediatek/mt2701/mt2701-afe-common.h b/sound/soc/mediatek/mt2701/mt2701-afe-common.h
index 32bef5e2a56d9..7b15283d6351e 100644
--- a/sound/soc/mediatek/mt2701/mt2701-afe-common.h
+++ b/sound/soc/mediatek/mt2701/mt2701-afe-common.h
@@ -90,6 +90,10 @@ struct mt2701_afe_private {
 	struct mt2701_i2s_path *i2s_path;
 	struct clk *base_ck[MT2701_BASE_CLK_NUM];
 	struct clk *mrgif_ck;
+	struct clk *hadds2pll_ck;
+	struct clk *audio_hdmi_ck;
+	struct clk *audio_spdf_ck;
+	struct clk *audio_apll_ck;
 	bool mrg_enable[MTK_STREAM_NUM];
 
 	const struct mt2701_soc_variants *soc;
-- 
2.53.0