dm: i2c: Add a message debug function
Add a way to dump the contents of an I2C message for debugging purposes.
Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: Heiko Schocher <hs@denx.de>
diff --git a/drivers/i2c/i2c-uclass.c b/drivers/i2c/i2c-uclass.c
index eaba965..42d6e89 100644
--- a/drivers/i2c/i2c-uclass.c
+++ b/drivers/i2c/i2c-uclass.c
@@ -18,6 +18,22 @@
#define I2C_MAX_OFFSET_LEN 4
+/* Useful debugging function */
+void i2c_dump_msgs(struct i2c_msg *msg, int nmsgs)
+{
+ int i;
+
+ for (i = 0; i < nmsgs; i++) {
+ struct i2c_msg *m = &msg[i];
+
+ printf(" %s %x len=%x", m->flags & I2C_M_RD ? "R" : "W",
+ msg->addr, msg->len);
+ if (!(m->flags & I2C_M_RD))
+ printf(": %x", m->buf[0]);
+ printf("\n");
+ }
+}
+
/**
* i2c_setup_offset() - Set up a new message with a chip offset
*
diff --git a/include/i2c.h b/include/i2c.h
index 9300d97..a5498a3 100644
--- a/include/i2c.h
+++ b/include/i2c.h
@@ -473,6 +473,16 @@
int i2c_chip_ofdata_to_platdata(const void *blob, int node,
struct dm_i2c_chip *chip);
+/**
+ * i2c_dump_msgs() - Dump a list of I2C messages
+ *
+ * This may be useful for debugging.
+ *
+ * @msg: Message list to dump
+ * @nmsgs: Number of messages
+ */
+void i2c_dump_msgs(struct i2c_msg *msg, int nmsgs);
+
#ifndef CONFIG_DM_I2C
/*