ASoC: cs35l45: Support for GPIO pins configuration.

Adds device tree configuration for cs35l45 GPIOs
Signed-off-by: Vlad Karpovich <vkarpovi@opensource.cirrus.com>
Link: https://lore.kernel.org/r/20230315154722.3911463-1-vkarpovi@opensource.cirrus.comSigned-off-by: Mark Brown <broonie@kernel.org>

include/dt-bindings/sound/cs35l45.h

@@ -17,4 +17,61 @@
 #define CS35L45_ASP_TX_HIZ_UNUSED	0x1
 #define CS35L45_ASP_TX_HIZ_DISABLED	0x2
 
+/*
+ * Optional GPIOX Sub-nodes:
+ *  The cs35l45 node can have up to three "cirrus,gpio-ctrlX" ('X' = [1,2,3])
+ *  sub-nodes for configuring the GPIO pins.
+ *
+ * - gpio-dir : GPIO pin direction. Valid only when 'gpio-ctrl'
+ *   is 1.
+ *    0 = Output
+ *    1 = Input (Default)
+ *
+ * - gpio-lvl : GPIO level. Valid only when 'gpio-ctrl' is 1 and 'gpio-dir' is 0.
+ *
+ *    0 = Low (Default)
+ *    1 = High
+ *
+ * - gpio-op-cfg : GPIO output configuration. Valid only when 'gpio-ctrl' is 1
+ *   and 'gpio-dir' is 0.
+ *
+ *    0 = CMOS (Default)
+ *    1 = Open Drain
+ *
+ * - gpio-pol : GPIO output polarity select. Valid only when 'gpio-ctrl' is 1
+ *   and 'gpio-dir' is 0.
+ *
+ *    0 = Non-inverted, Active High (Default)
+ *    1 = Inverted, Active Low
+ *
+ * - gpio-invert : Defines the polarity of the GPIO pin if configured
+ *   as input.
+ *
+ *    0 = Not inverted (Default)
+ *    1 = Inverted
+ *
+ * - gpio-ctrl : Defines the function of the GPIO pin.
+ *
+ * GPIO1:
+ *   0 = High impedance input (Default)
+ *   1 = Pin acts as a GPIO, direction controlled by 'gpio-dir'
+ *   2 = Pin acts as MDSYNC, direction controlled by MDSYNC
+ *   3-7 = Reserved
+ *
+ * GPIO2:
+ *   0 = High impedance input (Default)
+ *   1 = Pin acts as a GPIO, direction controlled by 'gpio-dir'
+ *   2 = Pin acts as open drain INT
+ *   3 = Reserved
+ *   4 = Pin acts as push-pull output INT. Active low.
+ *   5 = Pin acts as push-pull output INT. Active high.
+ *   6,7 = Reserved
+ *
+ * GPIO3:
+ *   0 = High impedance input (Default)
+ *   1 = Pin acts as a GPIO, direction controlled by 'gpio-dir'
+ *   2-7 = Reserved
+ */
+#define CS35L45_NUM_GPIOS	0x3
+
 #endif /* DT_CS35L45_H */

sound/soc/codecs/cs35l45-tables.c

@@ -43,6 +43,9 @@ EXPORT_SYMBOL_NS_GPL(cs35l45_apply_patch, SND_SOC_CS35L45);
 static const struct reg_default cs35l45_defaults[] = {
 	{ CS35L45_BLOCK_ENABLES,		0x00003323 },
 	{ CS35L45_BLOCK_ENABLES2,		0x00000010 },
+	{ CS35L45_SYNC_GPIO1,			0x00000007 },
+	{ CS35L45_INTB_GPIO2_MCLK_REF,		0x00000005 },
+	{ CS35L45_GPIO3,			0x00000005 },
 	{ CS35L45_REFCLK_INPUT,			0x00000510 },
 	{ CS35L45_GLOBAL_SAMPLE_RATE,		0x00000003 },
 	{ CS35L45_ASP_ENABLES1,			0x00000000 },
@@ -61,6 +64,9 @@ static const struct reg_default cs35l45_defaults[] = {
 	{ CS35L45_ASPTX4_INPUT,			0x00000028 },
 	{ CS35L45_ASPTX5_INPUT,			0x00000048 },
 	{ CS35L45_AMP_PCM_CONTROL,		0x00100000 },
+	{ CS35L45_GPIO1_CTRL1,			0x81000001 },
+	{ CS35L45_GPIO2_CTRL1,			0x81000001 },
+	{ CS35L45_GPIO3_CTRL1,			0x81000001 },
 };
 
 static bool cs35l45_readable_reg(struct device *dev, unsigned int reg)
@@ -72,6 +78,9 @@ static bool cs35l45_readable_reg(struct device *dev, unsigned int reg)
 	case CS35L45_BLOCK_ENABLES:
 	case CS35L45_BLOCK_ENABLES2:
 	case CS35L45_ERROR_RELEASE:
+	case CS35L45_SYNC_GPIO1:
+	case CS35L45_INTB_GPIO2_MCLK_REF:
+	case CS35L45_GPIO3:
 	case CS35L45_REFCLK_INPUT:
 	case CS35L45_GLOBAL_SAMPLE_RATE:
 	case CS35L45_ASP_ENABLES1:
@@ -92,6 +101,10 @@ static bool cs35l45_readable_reg(struct device *dev, unsigned int reg)
 	case CS35L45_AMP_PCM_CONTROL:
 	case CS35L45_AMP_PCM_HPF_TST:
 	case CS35L45_IRQ1_EINT_4:
+	case CS35L45_GPIO_STATUS1:
+	case CS35L45_GPIO1_CTRL1:
+	case CS35L45_GPIO2_CTRL1:
+	case CS35L45_GPIO3_CTRL1:
 		return true;
 	default:
 		return false;
@@ -107,6 +120,7 @@ static bool cs35l45_volatile_reg(struct device *dev, unsigned int reg)
 	case CS35L45_ERROR_RELEASE:
 	case CS35L45_AMP_PCM_HPF_TST:	/* not cachable */
 	case CS35L45_IRQ1_EINT_4:
+	case CS35L45_GPIO_STATUS1:
 		return true;
 	default:
 		return false;

sound/soc/codecs/cs35l45.c

@@ -536,7 +536,63 @@ static int __maybe_unused cs35l45_runtime_resume(struct device *dev)
 
 static int cs35l45_apply_property_config(struct cs35l45_private *cs35l45)
 {
+	struct device_node *node = cs35l45->dev->of_node;
+	unsigned int gpio_regs[] = {CS35L45_GPIO1_CTRL1, CS35L45_GPIO2_CTRL1,
+				    CS35L45_GPIO3_CTRL1};
+	unsigned int pad_regs[] = {CS35L45_SYNC_GPIO1,
+				   CS35L45_INTB_GPIO2_MCLK_REF, CS35L45_GPIO3};
+	struct device_node *child;
 	unsigned int val;
+	char of_name[32];
+	int ret, i;
+
+	if (!node)
+		return 0;
+
+	for (i = 0; i < CS35L45_NUM_GPIOS; i++) {
+		sprintf(of_name, "cirrus,gpio-ctrl%d", i + 1);
+		child = of_get_child_by_name(node, of_name);
+		if (!child)
+			continue;
+
+		ret = of_property_read_u32(child, "gpio-dir", &val);
+		if (!ret)
+			regmap_update_bits(cs35l45->regmap, gpio_regs[i],
+					   CS35L45_GPIO_DIR_MASK,
+					   val << CS35L45_GPIO_DIR_SHIFT);
+
+		ret = of_property_read_u32(child, "gpio-lvl", &val);
+		if (!ret)
+			regmap_update_bits(cs35l45->regmap, gpio_regs[i],
+					   CS35L45_GPIO_LVL_MASK,
+					   val << CS35L45_GPIO_LVL_SHIFT);
+
+		ret = of_property_read_u32(child, "gpio-op-cfg", &val);
+		if (!ret)
+			regmap_update_bits(cs35l45->regmap, gpio_regs[i],
+					   CS35L45_GPIO_OP_CFG_MASK,
+					   val << CS35L45_GPIO_OP_CFG_SHIFT);
+
+		ret = of_property_read_u32(child, "gpio-pol", &val);
+		if (!ret)
+			regmap_update_bits(cs35l45->regmap, gpio_regs[i],
+					   CS35L45_GPIO_POL_MASK,
+					   val << CS35L45_GPIO_POL_SHIFT);
+
+		ret = of_property_read_u32(child, "gpio-ctrl", &val);
+		if (!ret)
+			regmap_update_bits(cs35l45->regmap, pad_regs[i],
+					   CS35L45_GPIO_CTRL_MASK,
+					   val << CS35L45_GPIO_CTRL_SHIFT);
+
+		ret = of_property_read_u32(child, "gpio-invert", &val);
+		if (!ret)
+			regmap_update_bits(cs35l45->regmap, pad_regs[i],
+					   CS35L45_GPIO_INVERT_MASK,
+					   val << CS35L45_GPIO_INVERT_SHIFT);
+
+		of_node_put(child);
+	}
 
 	if (device_property_read_u32(cs35l45->dev,
 				     "cirrus,asp-sdout-hiz-ctrl", &val) == 0) {

sound/soc/codecs/cs35l45.h

@@ -14,6 +14,7 @@
 #include <linux/pm_runtime.h>
 #include <linux/regmap.h>
 #include <linux/regulator/consumer.h>
+#include <dt-bindings/sound/cs35l45.h>
 
 #define CS35L45_DEVID				0x00000000
 #define CS35L45_REVID				0x00000004
@@ -24,6 +25,9 @@
 #define CS35L45_BLOCK_ENABLES			0x00002018
 #define CS35L45_BLOCK_ENABLES2			0x0000201C
 #define CS35L45_ERROR_RELEASE			0x00002034
+#define CS35L45_SYNC_GPIO1			0x00002430
+#define CS35L45_INTB_GPIO2_MCLK_REF		0x00002434
+#define CS35L45_GPIO3				0x00002438
 #define CS35L45_REFCLK_INPUT			0x00002C04
 #define CS35L45_GLOBAL_SAMPLE_RATE		0x00002C0C
 #define CS35L45_BOOST_CCM_CFG			0x00003808
@@ -48,8 +52,11 @@
 #define CS35L45_AMP_PCM_CONTROL			0x00007000
 #define CS35L45_AMP_PCM_HPF_TST			0x00007004
 #define CS35L45_IRQ1_EINT_4			0x0000E01C
-#define CS35L45_LASTREG				0x0000E01C
-
+#define CS35L45_GPIO_STATUS1			0x0000F000
+#define CS35L45_GPIO1_CTRL1			0x0000F008
+#define CS35L45_GPIO2_CTRL1			0x0000F00C
+#define CS35L45_GPIO3_CTRL1			0x0000F010
+#define CS35L45_LASTREG			0x0000F010
 /* SFT_RESET */
 #define CS35L45_SOFT_RESET_TRIGGER		0x5A000000
 
@@ -165,6 +172,22 @@
 #define CS35L45_OTP_BOOT_DONE_STS_MASK		BIT(1)
 #define CS35L45_OTP_BUSY_MASK			BIT(0)
 
+/* GPIOX_CTRL1 */
+#define CS35L45_GPIO_DIR_SHIFT			31
+#define CS35L45_GPIO_DIR_MASK			BIT(31)
+#define CS35L45_GPIO_LVL_SHIFT			15
+#define CS35L45_GPIO_LVL_MASK			BIT(15)
+#define CS35L45_GPIO_OP_CFG_SHIFT		14
+#define CS35L45_GPIO_OP_CFG_MASK		BIT(14)
+#define CS35L45_GPIO_POL_SHIFT			12
+#define CS35L45_GPIO_POL_MASK			BIT(12)
+
+/* SYNC_GPIO1, INTB_GPIO2_MCLK_REF, GPIO3 */
+#define CS35L45_GPIO_CTRL_SHIFT		20
+#define CS35L45_GPIO_CTRL_MASK			GENMASK(22, 20)
+#define CS35L45_GPIO_INVERT_SHIFT		19
+#define CS35L45_GPIO_INVERT_MASK		BIT(19)
+
 /* Mixer sources */
 #define CS35L45_PCM_SRC_MASK			0x7F
 #define CS35L45_PCM_SRC_ZERO			0x00