[U-Boot] [PATCH v2 17/28] dm: i2c: Add a command to adjust the offset length

[Christophe Ricard <christophe.ricard@gmail.com>]

Hi Simon,

This one is fine with me.

Acked-by: Christophe Ricard<christophe-h.ricard@st.com>

Best Regards
Christophe

On 23/08/2015 02:31, Simon Glass wrote:
> I2C chips can support a register offset, with registers accessible by
> sending this offset as the first part of any read or write transaction.
> Most I2C chips have a single byte offset, thus the offset length is 1.
> This provides access for up 256 registers.
>
> However other offset lengths are supported, including 0.
>
> Add a command to provide access to the offset length from the command
> line. This allows the offset length to be read or written.
>
> Signed-off-by: Simon Glass <sjg@chromium.org>
> ---
>
> Changes in v2: None
>
>   common/cmd_i2c.c | 33 +++++++++++++++++++++++++++++++++
>   1 file changed, 33 insertions(+)
>
> diff --git a/common/cmd_i2c.c b/common/cmd_i2c.c
> index 1bc0db8..864b259 100644
> --- a/common/cmd_i2c.c
> +++ b/common/cmd_i2c.c
> @@ -453,6 +453,37 @@ static int do_i2c_flags(cmd_tbl_t *cmdtp, int flag, int argc,
>   
>   	return 0;
>   }
> +
> +static int do_i2c_olen(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
> +{
> +	struct udevice *dev;
> +	uint olen;
> +	int chip;
> +	int ret;
> +
> +	if (argc < 2)
> +		return CMD_RET_USAGE;
> +
> +	chip = simple_strtoul(argv[1], NULL, 16);
> +	ret = i2c_get_cur_bus_chip(chip, &dev);
> +	if (ret)
> +		return i2c_report_err(ret, I2C_ERR_READ);
> +
> +	if (argc > 2) {
> +		olen = simple_strtoul(argv[2], NULL, 16);
> +		ret = i2c_set_chip_offset_len(dev, olen);
> +	} else  {
> +		ret = i2c_get_chip_offset_len(dev);
> +		if (ret >= 0) {
> +			printf("%x\n", ret);
> +			ret = 0;
> +		}
> +	}
> +	if (ret)
> +		return i2c_report_err(ret, I2C_ERR_READ);
> +
> +	return 0;
> +}
>   #endif
>   
>   /**
> @@ -1903,6 +1934,7 @@ static cmd_tbl_t cmd_i2c_sub[] = {
>   	U_BOOT_CMD_MKENT(write, 6, 0, do_i2c_write, "", ""),
>   #ifdef CONFIG_DM_I2C
>   	U_BOOT_CMD_MKENT(flags, 2, 1, do_i2c_flags, "", ""),
> +	U_BOOT_CMD_MKENT(olen, 2, 1, do_i2c_olen, "", ""),
>   #endif
>   	U_BOOT_CMD_MKENT(reset, 0, 1, do_i2c_reset, "", ""),
>   #if defined(CONFIG_CMD_SDRAM)
> @@ -1971,6 +2003,7 @@ static char i2c_help_text[] =
>   	"          to I2C; the -s option selects bulk write in a single transaction\n"
>   #ifdef CONFIG_DM_I2C
>   	"i2c flags chip [flags] - set or get chip flags\n"
> +	"i2c olen chip [offset_length] - set or get chip offset length\n"
>   #endif
>   	"i2c reset - re-init the I2C Controller\n"
>   #if defined(CONFIG_CMD_SDRAM)