mfd: cros_ec: Instantiate sub-devices from device tree

If the EC device tree node has sub-nodes, try to instantiate them as
MFD sub-devices.  We can configure the EC features provided by the board.

Signed-off-by: Todd Broch <tbroch@chromium.org>
Signed-off-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk>
Reviewed-by: Gwendal Grignou <gwendal@chromium.org>
Tested-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

diff --git a/drivers/mfd/cros_ec.c b/drivers/mfd/cros_ec.c
index c4aecc6..1574a93 100644 (file)
--- a/drivers/mfd/cros_ec.c
+++ b/drivers/mfd/cros_ec.c
@@ -17,6 +17,7 @@
  * battery charging and regulator control, firmware update.
  */
 
+#include <linux/of_platform.h>
 #include <linux/interrupt.h>
 #include <linux/slab.h>
 #include <linux/module.h>
@@ -109,18 +110,8 @@ EXPORT_SYMBOL(cros_ec_cmd_xfer);
 
 static const struct mfd_cell cros_devs[] = {
        {
-               .name = "cros-ec-keyb",
-               .id = 1,
-               .of_compatible = "google,cros-ec-keyb",
-       },
-       {
-               .name = "cros-ec-i2c-tunnel",
-               .id = 2,
-               .of_compatible = "google,cros-ec-i2c-tunnel",
-       },
-       {
                .name = "cros-ec-ctl",
-               .id = 3,
+               .id = PLATFORM_DEVID_AUTO,
        },
 };
 
@@ -150,6 +141,15 @@ int cros_ec_register(struct cros_ec_device *ec_dev)
                return err;
        }
 
+       if (IS_ENABLED(CONFIG_OF) && dev->of_node) {
+               err = of_platform_populate(dev->of_node, NULL, NULL, dev);
+               if (err) {
+                       mfd_remove_devices(dev);
+                       dev_err(dev, "Failed to register sub-devices\n");
+                       return err;
+               }
+       }
+
        dev_info(dev, "Chrome EC device registered\n");
 
        return 0;