Check whether this EC instance has RTC host command support and instatiate
the RTC driver as a subdevice in such case.

Signed-off-by: Enric Balletbo i Serra <enric.balle...@collabora.com>
---
 drivers/mfd/cros_ec_dev.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/drivers/mfd/cros_ec_dev.c b/drivers/mfd/cros_ec_dev.c
index e4fafdd96e5e..e0c604ab380f 100644
--- a/drivers/mfd/cros_ec_dev.c
+++ b/drivers/mfd/cros_ec_dev.c
@@ -389,6 +389,10 @@ static void cros_ec_sensors_register(struct cros_ec_dev 
*ec)
        kfree(msg);
 }
 
+static const struct mfd_cell cros_ec_rtc_cell = {
+       .name = "cros-ec-rtc",
+};
+
 static int ec_device_probe(struct platform_device *pdev)
 {
        int retval = -ENOMEM;
@@ -437,6 +441,16 @@ 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)) {
+               retval = mfd_add_devices(ec->dev, PLATFORM_DEVID_AUTO,
+                                        &cros_ec_rtc_cell, 1, NULL, 0, NULL);
+               if (retval)
+                       dev_err(ec->dev,
+                               "failed to add cros-ec-rtc device: %d\n",
+                               retval);
+       }
+
        /* Take control of the lightbar from the EC. */
        lb_manual_suspend_ctrl(ec, 1);
 
-- 
2.16.1

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