From: Bastian Krause <bst@xxxxxxxxxxxxxx> Add a common PMIC read function to PBL which allows easy porting of U-Boot's pmic_reg_read() in lowlevel board code. Signed-off-by: Bastian Krause <bst@xxxxxxxxxxxxxx> Reviewed-by: Ahmad Fatoum <a.fatoum@xxxxxxxxxxxxxx> Link: https://lore.barebox.org/20231220104739.10700-1-bst@xxxxxxxxxxxxxx Signed-off-by: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx> --- include/pbl/pmic.h | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) diff --git a/include/pbl/pmic.h b/include/pbl/pmic.h index 695e47a564..91c5be3ff3 100644 --- a/include/pbl/pmic.h +++ b/include/pbl/pmic.h @@ -9,6 +9,27 @@ struct pmic_config { u8 val; }; +static inline void pmic_reg_read8(struct pbl_i2c *i2c, int addr, u8 reg, u8 *val) +{ + int ret; + struct i2c_msg msg[] = { + { + .addr = addr, + .buf = ®, + .len = 1, + }, { + .addr = addr, + .flags = I2C_M_RD, + .buf = val, + .len = 1, + }, + }; + + ret = pbl_i2c_xfer(i2c, msg, ARRAY_SIZE(msg)); + if (ret != ARRAY_SIZE(msg)) + pr_err("Failed to read from pmic@%x: %d\n", addr, ret); +} + static void pmic_reg_write8(struct pbl_i2c *i2c, int addr, u8 reg, u8 val) { int ret; -- 2.39.2