DM: I2C: Introduce 'u-boot, i2c-transaction-bytes' property

[oweals/u-boot.git] / drivers / i2c / i2c-uclass.c

diff --git a/drivers/i2c/i2c-uclass.c b/drivers/i2c/i2c-uclass.c
index 49e23a0a4bf20d1662abfecf30cfe90c843bed59..e47abf18333f4452b31c8662e4160358ab4b575f 100644 (file)
--- a/drivers/i2c/i2c-uclass.c
+++ b/drivers/i2c/i2c-uclass.c
@@ -593,6 +593,29 @@ int i2c_chip_ofdata_to_platdata(struct udevice *dev, struct dm_i2c_chip *chip)
 }
 #endif
 
+static int i2c_pre_probe(struct udevice *dev)
+{
+#if CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)
+       struct dm_i2c_bus *i2c = dev_get_uclass_priv(dev);
+       unsigned int max = 0;
+       ofnode node;
+       int ret;
+
+       i2c->max_transaction_bytes = 0;
+       dev_for_each_subnode(node, dev) {
+               ret = ofnode_read_u32(node,
+                                     "u-boot,i2c-transaction-bytes",
+                                     &max);
+               if (!ret && max > i2c->max_transaction_bytes)
+                       i2c->max_transaction_bytes = max;
+       }
+
+       debug("%s: I2C bus: %s max transaction bytes: %d\n", __func__,
+             dev->name, i2c->max_transaction_bytes);
+#endif
+       return 0;
+}
+
 static int i2c_post_probe(struct udevice *dev)
 {
 #if CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)
@@ -674,6 +697,7 @@ UCLASS_DRIVER(i2c) = {
        .post_bind      = i2c_post_bind,
        .init           = i2c_uclass_init,
        .priv_auto_alloc_size = sizeof(struct i2c_priv),
+       .pre_probe      = i2c_pre_probe,
        .post_probe     = i2c_post_probe,
        .per_device_auto_alloc_size = sizeof(struct dm_i2c_bus),
        .per_child_platdata_auto_alloc_size = sizeof(struct dm_i2c_chip),