[PATCH v2 4/4] mfd: cros_ec: add RTC as mfd subdevice

[Enric Balletbo i Serra]

From: Stephen Barber <smbar...@chromium.org>

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

Signed-off-by: Stephen Barber <smbar...@chromium.org>
Signed-off-by: Enric Balletbo i Serra <enric.balle...@collabora.com>
---
 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