mfd: madera: Add support for requesting the supply clocks

Add the ability to get the clock for each clock input pin of the chip
and enable MCLK2 since that is expected to be a permanently enabled
32kHz clock.

Signed-off-by: Charles Keepax <[e-mail]>
Signed-off-by: Lee Jones <[e-mail]>

drivers/mfd/madera-core.c

···
 		       sizeof(madera->pdata));
 	}
 
+	madera->mclk[MADERA_MCLK1].id = "mclk1";
+	madera->mclk[MADERA_MCLK2].id = "mclk2";
+	madera->mclk[MADERA_MCLK3].id = "mclk3";
+
+	ret = devm_clk_bulk_get_optional(madera->dev, ARRAY_SIZE(madera->mclk),
+					 madera->mclk);
+	if (ret) {
+		dev_err(madera->dev, "Failed to get clocks: %d\n", ret);
+		return ret;
+	}
+
+	/* Not using devm_clk_get to prevent breakage of existing DTs */
+	if (!madera->mclk[MADERA_MCLK2].clk)
+		dev_warn(madera->dev, "Missing MCLK2, requires 32kHz clock\n");
+
 	ret = madera_get_reset_gpio(madera);
 	if (ret)
 		return ret;
···
 	}
 
 	/* Init 32k clock sourced from MCLK2 */
+	ret = clk_prepare_enable(madera->mclk[MADERA_MCLK2].clk);
+	if (ret) {
+		dev_err(madera->dev, "Failed to enable 32k clock: %d\n", ret);
+		goto err_reset;
+	}
+
 	ret = regmap_update_bits(madera->regmap,
 			MADERA_CLOCK_32K_1,
 			MADERA_CLK_32K_ENA_MASK | MADERA_CLK_32K_SRC_MASK,
 			MADERA_CLK_32K_ENA | MADERA_32KZ_MCLK2);
 	if (ret) {
 		dev_err(madera->dev, "Failed to init 32k clock: %d\n", ret);
-		goto err_reset;
+		goto err_clock;
 	}
 
 	pm_runtime_set_active(madera->dev);
···
 
 err_pm_runtime:
 	pm_runtime_disable(madera->dev);
+err_clock:
+	clk_disable_unprepare(madera->mclk[MADERA_MCLK2].clk);
 err_reset:
 	madera_enable_hard_reset(madera);
 	regulator_disable(madera->dcvdd);
···
 	 * removing the children, and prevent PM runtime from turning it back on
 	 */
 	pm_runtime_disable(madera->dev);
+
+	clk_disable_unprepare(madera->mclk[MADERA_MCLK2].clk);
 
 	regulator_disable(madera->dcvdd);
 	regulator_put(madera->dcvdd);

include/linux/mfd/madera/core.h

···
 #ifndef MADERA_CORE_H
 #define MADERA_CORE_H
 
+#include <linux/clk.h>
 #include <linux/gpio/consumer.h>
 #include <linux/interrupt.h>
 #include <linux/mfd/madera/pdata.h>
···
 	WM1840 = 7,
 	CS47L15 = 8,
 	CS42L92 = 9,
+};
+
+enum {
+	MADERA_MCLK1,
+	MADERA_MCLK2,
+	MADERA_MCLK3,
+	MADERA_NUM_MCLK
 };
 
 #define MADERA_MAX_CORE_SUPPLIES	2
···
  * @irq_dev:		the irqchip child driver device
  * @irq_data:		pointer to irqchip data for the child irqchip driver
  * @irq:		host irq number from SPI or I2C configuration
+ * @mclk:		Structure holding clock supplies
  * @out_clamp:		indicates output clamp state for each analogue output
  * @out_shorted:	indicates short circuit state for each analogue output
  * @hp_ena:		bitflags of enable state for the headphone outputs
···
 	struct device *irq_dev;
 	struct regmap_irq_chip_data *irq_data;
 	int irq;
+
+	struct clk_bulk_data mclk[MADERA_NUM_MCLK];
 
 	unsigned int num_micbias;
 	unsigned int num_childbias[MADERA_MAX_MICBIAS];