From: Neil Armstrong <narmstrong@baylibre.com>
Date: Thu, 8 Nov 2018 12:50:09 +0000 (-0500)
Subject: media: cxd2880-spi: Add optional vcc regulator
X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=cb496cd472af3ec922063c14fd71a72db4467f6f;p=openwrt%2Fstaging%2Fblogic.git

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@baylibre.com>
Acked-by: Yasunari Takiguchi <Yasunari.Takiguchi@sony.com>
Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
---

diff --git a/drivers/media/spi/cxd2880-spi.c b/drivers/media/spi/cxd2880-spi.c
index c43730977f53..d5c433e20d4a 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");