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

[Ahmad Fatoum]

On 09.08.23 09:26, Marc Kleine-Budde wrote:
> Add a small helper to read a single page of EEPROM data.
> 
> Signed-off-by: Marc Kleine-Budde <mkl at pengutronix.de>

Reviewed-by: Ahmad Fatoum <a.fatoum at 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
> 

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