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From:   Neil Armstrong <narmstrong@baylibre.com>
To:     jbrunet@baylibre.com, broonie@kernel.org
Cc:     alsa-devel@alsa-project.org, linux-amlogic@lists.infradead.org,
        linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org,
        Neil Armstrong <narmstrong@baylibre.com>
Subject: [PATCH v3 1/2] ASoC: meson: g12a-toacodec: use regmap fields to prepare SM1 support
Date:   Tue, 11 May 2021 09:48:28 +0200
Message-Id: <20210511074829.4110036-2-narmstrong@baylibre.com>
In-Reply-To: <20210511074829.4110036-1-narmstrong@baylibre.com>
References: <20210511074829.4110036-1-narmstrong@baylibre.com>
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Switch usage to regmap field for bits handled by the g12a_toacodec_mux_put_enum()
function to avoid uselesss code duplication when adding SM1 variant support.

Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
---
 sound/soc/meson/g12a-toacodec.c | 80 +++++++++++++++++++++++++--------
 1 file changed, 62 insertions(+), 18 deletions(-)

diff --git a/sound/soc/meson/g12a-toacodec.c b/sound/soc/meson/g12a-toacodec.c
index 9339fabccb79..6317bd9c86f4 100644
--- a/sound/soc/meson/g12a-toacodec.c
+++ b/sound/soc/meson/g12a-toacodec.c
@@ -21,17 +21,31 @@
 
 #define TOACODEC_CTRL0			0x0
 #define  CTRL0_ENABLE_SHIFT		31
-#define  CTRL0_DAT_SEL_SHIFT		14
-#define  CTRL0_DAT_SEL			(0x3 << CTRL0_DAT_SEL_SHIFT)
+#define  CTRL0_DAT_SEL_MSB		15
+#define  CTRL0_DAT_SEL_LSB		14
 #define  CTRL0_LANE_SEL			12
-#define  CTRL0_LRCLK_SEL		GENMASK(9, 8)
+#define  CTRL0_LRCLK_SEL_MSB		9
+#define  CTRL0_LRCLK_SEL_LSB		8
 #define  CTRL0_BLK_CAP_INV		BIT(7)
 #define  CTRL0_BCLK_O_INV		BIT(6)
-#define  CTRL0_BCLK_SEL			GENMASK(5, 4)
+#define  CTRL0_BCLK_SEL_MSB		5
+#define  CTRL0_BCLK_SEL_LSB		4
 #define  CTRL0_MCLK_SEL			GENMASK(2, 0)
 
 #define TOACODEC_OUT_CHMAX		2
 
+struct g12a_toacodec {
+	struct regmap_field *field_dat_sel;
+	struct regmap_field *field_lrclk_sel;
+	struct regmap_field *field_bclk_sel;
+};
+
+struct g12a_toacodec_match_data {
+	struct reg_field field_dat_sel;
+	struct reg_field field_lrclk_sel;
+	struct reg_field field_bclk_sel;
+};
+
 static const char * const g12a_toacodec_mux_texts[] = {
 	"I2S A", "I2S B", "I2S C",
 };
@@ -41,29 +55,24 @@ static int g12a_toacodec_mux_put_enum(struct snd_kcontrol *kcontrol,
 {
 	struct snd_soc_component *component =
 		snd_soc_dapm_kcontrol_component(kcontrol);
+	struct g12a_toacodec *priv = snd_soc_component_get_drvdata(component);
 	struct snd_soc_dapm_context *dapm =
 		snd_soc_dapm_kcontrol_dapm(kcontrol);
 	struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;
-	unsigned int mux, changed;
+	unsigned int mux, reg;
 
 	mux = snd_soc_enum_item_to_val(e, ucontrol->value.enumerated.item[0]);
-	changed = snd_soc_component_test_bits(component, e->reg,
-					      CTRL0_DAT_SEL,
-					      FIELD_PREP(CTRL0_DAT_SEL, mux));
+	regmap_field_read(priv->field_dat_sel, &reg);
 
-	if (!changed)
+	if (mux == reg)
 		return 0;
 
 	/* Force disconnect of the mux while updating */
 	snd_soc_dapm_mux_update_power(dapm, kcontrol, 0, NULL, NULL);
 
-	snd_soc_component_update_bits(component, e->reg,
-				      CTRL0_DAT_SEL |
-				      CTRL0_LRCLK_SEL |
-				      CTRL0_BCLK_SEL,
-				      FIELD_PREP(CTRL0_DAT_SEL, mux) |
-				      FIELD_PREP(CTRL0_LRCLK_SEL, mux) |
-				      FIELD_PREP(CTRL0_BCLK_SEL, mux));
+	regmap_field_write(priv->field_dat_sel, mux);
+	regmap_field_write(priv->field_lrclk_sel, mux);
+	regmap_field_write(priv->field_bclk_sel, mux);
 
 	/*
 	 * FIXME:
@@ -86,7 +95,7 @@ static int g12a_toacodec_mux_put_enum(struct snd_kcontrol *kcontrol,
 }
 
 static SOC_ENUM_SINGLE_DECL(g12a_toacodec_mux_enum, TOACODEC_CTRL0,
-			    CTRL0_DAT_SEL_SHIFT,
+			    CTRL0_DAT_SEL_LSB,
 			    g12a_toacodec_mux_texts);
 
 static const struct snd_kcontrol_new g12a_toacodec_mux =
@@ -205,19 +214,42 @@ static const struct regmap_config g12a_toacodec_regmap_cfg = {
 	.reg_stride	= 4,
 };
 
+static const struct g12a_toacodec_match_data g12a_toacodec_match_data = {
+	.field_dat_sel	= REG_FIELD(TOACODEC_CTRL0, 14, 15),
+	.field_lrclk_sel = REG_FIELD(TOACODEC_CTRL0, 8, 9),
+	.field_bclk_sel	= REG_FIELD(TOACODEC_CTRL0, 4, 5),
+};
+
 static const struct of_device_id g12a_toacodec_of_match[] = {
-	{ .compatible = "amlogic,g12a-toacodec", },
+	{
+		.compatible = "amlogic,g12a-toacodec",
+		.data = &g12a_toacodec_match_data,
+	},
 	{}
 };
 MODULE_DEVICE_TABLE(of, g12a_toacodec_of_match);
 
 static int g12a_toacodec_probe(struct platform_device *pdev)
 {
+	const struct g12a_toacodec_match_data *data;
 	struct device *dev = &pdev->dev;
+	struct g12a_toacodec *priv;
 	void __iomem *regs;
 	struct regmap *map;
 	int ret;
 
+	data = device_get_match_data(dev);
+	if (!data) {
+		dev_err(dev, "failed to match device\n");
+		return -ENODEV;
+	}
+
+	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, priv);
+
 	ret = device_reset(dev);
 	if (ret)
 		return ret;
@@ -233,6 +265,18 @@ static int g12a_toacodec_probe(struct platform_device *pdev)
 		return PTR_ERR(map);
 	}
 
+	priv->field_dat_sel = devm_regmap_field_alloc(dev, map, data->field_dat_sel);
+	if (IS_ERR(priv->field_dat_sel))
+		return PTR_ERR(priv->field_dat_sel);
+
+	priv->field_lrclk_sel = devm_regmap_field_alloc(dev, map, data->field_lrclk_sel);
+	if (IS_ERR(priv->field_lrclk_sel))
+		return PTR_ERR(priv->field_lrclk_sel);
+
+	priv->field_bclk_sel = devm_regmap_field_alloc(dev, map, data->field_bclk_sel);
+	if (IS_ERR(priv->field_bclk_sel))
+		return PTR_ERR(priv->field_bclk_sel);
+
 	return devm_snd_soc_register_component(dev,
 			&g12a_toacodec_component_drv, g12a_toacodec_dai_drv,
 			ARRAY_SIZE(g12a_toacodec_dai_drv));
-- 
2.25.1