From: Todd Broch <tbroch@xxxxxxxxxxxx>
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@xxxxxxxxxxxx>
---
drivers/mfd/cros_ec.c | 40 ++++++++++++++++++++++++++++++----------
1 file changed, 30 insertions(+), 10 deletions(-)
diff --git a/drivers/mfd/cros_ec.c b/drivers/mfd/cros_ec.c
index 634c434..96c926c 100644
--- a/drivers/mfd/cros_ec.c
+++ b/drivers/mfd/cros_ec.c
@@ -21,6 +21,7 @@
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/mfd/core.h>
+#include <linux/of_platform.h>
#include <linux/mfd/cros_ec.h>
#include <linux/mfd/cros_ec_commands.h>
#include <linux/delay.h>
@@ -109,22 +110,16 @@ int cros_ec_cmd_xfer(struct cros_ec_device *ec_dev,
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",
- },
};
int cros_ec_register(struct cros_ec_device *ec_dev)
{
struct device *dev = ec_dev->dev;
int err = 0;
+#ifdef CONFIG_OF
+ struct device_node *node;
+ int id = ARRAY_SIZE(cros_devs);
+#endif
if (ec_dev->din_size) {
ec_dev->din = devm_kzalloc(dev, ec_dev->din_size, GFP_KERNEL);
@@ -146,6 +141,31 @@ int cros_ec_register(struct cros_ec_device *ec_dev)
dev_err(dev, "failed to add mfd devices\n");
return err;
}
+#ifdef CONFIG_OF
+ /*
+ * Add sub-devices declared in the device tree. NOTE they should NOT be
+ * declared in cros_devs
+ */
+ for_each_child_of_node(dev->of_node, node) {
+ char name[128];
+ struct mfd_cell cell = {
+ .id = 0,
+ .name = name,
+ };
+
+ if (of_modalias_node(node, name, sizeof(name)) < 0) {
+ dev_err(dev, "modalias failure on %s\n",
+ node->full_name);
+ continue;
+ }
+ dev_dbg(dev, "adding MFD sub-device %s\n", node->name);
+ cell.of_compatible = of_get_property(node, "compatible", NULL);
+ err = mfd_add_devices(dev, ++id, &cell, 1, NULL, ec_dev->irq,
+ NULL);
+ if (err)
+ dev_err(dev, "fail to add %s\n", node->full_name);
+ }
+#endif
dev_info(dev, "Chrome EC device registered\n");
--
2.0.0.rc2
--
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