[U-Boot] [PATCH 08/12] sandbox: i2c: search child emul dev and check its uclass id

[Przemyslaw Marczak]

The function get_emul() in sandbox i2c bus driver, always returns
first child as i2c emul device. This may only work for i2c devices
with a single child, which is an only i2c emul device.

In case when i2c device has more than one child (e.g. PMIC), and
one is i2c emul, then the function should search it by check uclass
id for each child. This patch add this change to the get_emul().

Signed-off-by: Przemyslaw Marczak <p.marczak at samsung.com>
Cc: Simon Glass <sjg at chromium.org>
---
 drivers/i2c/sandbox_i2c.c | 20 +++++++++++++++++---
 1 file changed, 17 insertions(+), 3 deletions(-)

diff --git a/drivers/i2c/sandbox_i2c.c b/drivers/i2c/sandbox_i2c.c
index d6adc0f..d4b543d 100644
--- a/drivers/i2c/sandbox_i2c.c
+++ b/drivers/i2c/sandbox_i2c.c
@@ -26,6 +26,7 @@ static int get_emul(struct udevice *dev, struct udevice **devp,
 		    struct dm_i2c_ops **opsp)
 {
 	struct dm_i2c_chip *plat;
+	struct udevice *child;
 	int ret;
 
 	*devp = NULL;
@@ -37,9 +38,22 @@ static int get_emul(struct udevice *dev, struct udevice **devp,
 		if (ret)
 			return ret;
 
-		ret = device_get_child(dev, 0, &plat->emul);
-		if (ret)
-			return ret;
+		for (device_find_first_child(dev, &child); child;
+		     device_find_next_child(&child)) {
+			if (device_get_uclass_id(child) != UCLASS_I2C_EMUL)
+				continue;
+
+			ret = device_probe(child);
+			if (ret)
+				return ret;
+
+			break;
+		}
+
+		if (child)
+			plat->emul = child;
+		else
+			return -ENODEV;
 	}
 	*devp = plat->emul;
 	*opsp = i2c_get_ops(plat->emul);
-- 
1.9.1