[PATCH 2/2] mfd: madera: Add support for requesting the supply clocks

From: Charles Keepax
Date: Tue Aug 06 2019 - 11:13:32 EST


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 <ckeepax@xxxxxxxxxxxxxxxxxxxxx>
---
drivers/mfd/madera-core.c | 24 +++++++++++++++++++++++-
include/linux/mfd/madera/core.h | 11 +++++++++++
2 files changed, 34 insertions(+), 1 deletion(-)

diff --git a/drivers/mfd/madera-core.c b/drivers/mfd/madera-core.c
index 29540cbf75934..8d7ab1c7bf9f7 100644
--- a/drivers/mfd/madera-core.c
+++ b/drivers/mfd/madera-core.c
@@ -428,6 +428,7 @@ static void madera_set_micbias_info(struct madera *madera)

int madera_dev_init(struct madera *madera)
{
+ static const char * const mclk_name[] = { "mclk1", "mclk2", "mclk3" };
struct device *dev = madera->dev;
unsigned int hwid;
int (*patch_fn)(struct madera *) = NULL;
@@ -450,6 +451,17 @@ int madera_dev_init(struct madera *madera)
sizeof(madera->pdata));
}

+ BUILD_BUG_ON(ARRAY_SIZE(madera->mclk) != ARRAY_SIZE(mclk_name));
+ for (i = 0; i < ARRAY_SIZE(madera->mclk); i++) {
+ madera->mclk[i] = devm_clk_get_optional(madera->dev,
+ mclk_name[i]);
+ if (IS_ERR(madera->mclk[i])) {
+ dev_warn(madera->dev, "Failed to get %s: %ld\n",
+ mclk_name[i], PTR_ERR(madera->mclk[i]));
+ madera->mclk[i] = NULL;
+ }
+ }
+
ret = madera_get_reset_gpio(madera);
if (ret)
return ret;
@@ -660,13 +672,19 @@ int madera_dev_init(struct madera *madera)
}

/* Init 32k clock sourced from MCLK2 */
+ ret = clk_prepare_enable(madera->mclk[MADERA_MCLK2]);
+ if (ret != 0) {
+ 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);
@@ -687,6 +705,8 @@ int madera_dev_init(struct madera *madera)

err_pm_runtime:
pm_runtime_disable(madera->dev);
+err_clock:
+ clk_disable_unprepare(madera->mclk[MADERA_MCLK2]);
err_reset:
madera_enable_hard_reset(madera);
regulator_disable(madera->dcvdd);
@@ -713,6 +733,8 @@ int madera_dev_exit(struct madera *madera)
*/
pm_runtime_disable(madera->dev);

+ clk_disable_unprepare(madera->mclk[MADERA_MCLK2]);
+
regulator_disable(madera->dcvdd);
regulator_put(madera->dcvdd);

diff --git a/include/linux/mfd/madera/core.h b/include/linux/mfd/madera/core.h
index 7ffa696cce7ca..2b6c83fe221dc 100644
--- a/include/linux/mfd/madera/core.h
+++ b/include/linux/mfd/madera/core.h
@@ -8,6 +8,7 @@
#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>
@@ -29,6 +30,13 @@ enum madera_type {
CS42L92 = 9,
};

+enum {
+ MADERA_MCLK1,
+ MADERA_MCLK2,
+ MADERA_MCLK3,
+ MADERA_NUM_MCLK
+};
+
#define MADERA_MAX_CORE_SUPPLIES 2
#define MADERA_MAX_GPIOS 40

@@ -155,6 +163,7 @@ struct snd_soc_dapm_context;
* @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: pointers to 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
@@ -184,6 +193,8 @@ struct madera {
struct regmap_irq_chip_data *irq_data;
int irq;

+ struct clk *mclk[MADERA_NUM_MCLK];
+
unsigned int num_micbias;
unsigned int num_childbias[MADERA_MAX_MICBIAS];

--
2.11.0