[rtc-linux] [PATCH v3 4/4] mfd: cros_ec: add RTC as mfd subdevice

[Enric Balletbo i Serra <enric.balletbo@collabora.com>]

From: Stephen Barber <smbarber@chromium.org>

If the EC supports RTC host commands, expose an RTC device.

Signed-off-by: Stephen Barber <smbarber@chromium.org>
Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Acked-by: Benson Leung <bleung@chromium.org>
---
Changes since v2:
 - Acked by Benson Leung
Changes since v1:
 - none

 drivers/platform/chrome/cros_ec_dev.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/drivers/platform/chrome/cros_ec_dev.c b/drivers/platform/chrome/cros_ec_dev.c
index 47268ec..ebe029d 100644
--- a/drivers/platform/chrome/cros_ec_dev.c
+++ b/drivers/platform/chrome/cros_ec_dev.c
@@ -383,6 +383,24 @@ static void cros_ec_sensors_register(struct cros_ec_dev *ec)
 	kfree(msg);
 }
 
+static const struct mfd_cell cros_ec_rtc_devs[] = {
+	{
+		.name = "cros-ec-rtc",
+		.id   = -1,
+	},
+};
+
+static void cros_ec_rtc_register(struct cros_ec_dev *ec)
+{
+	int ret;
+
+	ret = mfd_add_devices(ec->dev, 0, cros_ec_rtc_devs,
+			      ARRAY_SIZE(cros_ec_rtc_devs),
+			      NULL, 0, NULL);
+	if (ret)
+		dev_err(ec->dev, "failed to add cros-ec-rtc device: %d\n", ret);
+}
+
 static int ec_device_probe(struct platform_device *pdev)
 {
 	int retval = -ENOMEM;
@@ -441,6 +459,10 @@ static int ec_device_probe(struct platform_device *pdev)
 	if (cros_ec_check_features(ec, EC_FEATURE_MOTION_SENSE))
 		cros_ec_sensors_register(ec);
 
+	/* check whether this EC instance has RTC host command support */
+	if (cros_ec_check_features(ec, EC_FEATURE_RTC))
+		cros_ec_rtc_register(ec);
+
 	return 0;
 
 dev_reg_failed:
-- 
2.9.3

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