[PATCH v4 1/3] i2c: add <pbl/eeprom.h> for PBL use

[Marc Kleine-Budde <mkl@pengutronix.de>]

Add a small helper to read a single page of EEPROM data.

Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
---
 include/pbl/eeprom.h | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)

diff --git a/include/pbl/eeprom.h b/include/pbl/eeprom.h
new file mode 100644
index 000000000000..df868b1a37fb
--- /dev/null
+++ b/include/pbl/eeprom.h
@@ -0,0 +1,34 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __PBL_EEPROM_H_
+#define __PBL_EEPROM_H_
+
+#include <common.h>
+#include <pbl/i2c.h>
+
+static inline void eeprom_read(struct pbl_i2c *i2c, u16 client_addr, u32 addr, void *buf, u16 count)
+{
+	u8 msgbuf[2];
+	struct i2c_msg msg[] = {
+		{
+			.addr = client_addr,
+			.buf = msgbuf,
+		}, {
+			.addr = client_addr,
+			.flags = I2C_M_RD,
+			.buf = buf,
+			.len = count,
+		},
+	};
+	int ret, i = 0;
+
+	if (addr & I2C_ADDR_16_BIT)
+		msgbuf[i++] = addr >> 8;
+	msgbuf[i++] = addr;
+	msg[0].len = i;
+
+	ret = pbl_i2c_xfer(i2c, msg, ARRAY_SIZE(msg));
+	if (ret != ARRAY_SIZE(msg))
+		pr_err("Failed to read from eeprom@%x: %d\n", client_addr, ret);
+}
+
+#endif

-- 
2.40.1