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[PATCH 1/2] media: cxd2880-spi: Add optional vcc regulator




This patchset adds an optional VCC regulator to the driver probe function to
make sure power is enabled to the module before starting attaching to
the device.

Signed-off-by: Neil Armstrong <narmstrong@xxxxxxxxxxxx>
---
 drivers/media/spi/cxd2880-spi.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/drivers/media/spi/cxd2880-spi.c b/drivers/media/spi/cxd2880-spi.c
index c437309..d5c433e 100644
--- a/drivers/media/spi/cxd2880-spi.c
+++ b/drivers/media/spi/cxd2880-spi.c
@@ -10,6 +10,7 @@
 #define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__
 
 #include <linux/spi/spi.h>
+#include <linux/regulator/consumer.h>
 #include <linux/ktime.h>
 
 #include <media/dvb_demux.h>
@@ -51,6 +52,7 @@ struct cxd2880_dvb_spi {
 	struct mutex spi_mutex; /* For SPI access exclusive control */
 	int feed_count;
 	int all_pid_feed_count;
+	struct regulator *vcc_supply;
 	u8 *ts_buf;
 	struct cxd2880_pid_filter_config filter_config;
 };
@@ -518,6 +520,17 @@ cxd2880_spi_probe(struct spi_device *spi)
 	if (!dvb_spi)
 		return -ENOMEM;
 
+	dvb_spi->vcc_supply = devm_regulator_get_optional(&spi->dev, "vcc");
+	if (IS_ERR(dvb_spi->vcc_supply)) {
+		if (PTR_ERR(dvb_spi->vcc_supply) == -EPROBE_DEFER)
+			return -EPROBE_DEFER;
+		dvb_spi->vcc_supply = NULL;
+	} else {
+		ret = regulator_enable(dvb_spi->vcc_supply);
+		if (ret)
+			return ret;
+	}
+
 	dvb_spi->spi = spi;
 	mutex_init(&dvb_spi->spi_mutex);
 	dev_set_drvdata(&spi->dev, dvb_spi);
@@ -631,6 +644,9 @@ cxd2880_spi_remove(struct spi_device *spi)
 	dvb_frontend_detach(&dvb_spi->dvb_fe);
 	dvb_unregister_adapter(&dvb_spi->adapter);
 
+	if (dvb_spi->vcc_supply)
+		regulator_disable(dvb_spi->vcc_supply);
+
 	kfree(dvb_spi);
 	pr_info("cxd2880_spi remove ok.\n");
 
-- 
2.7.4