[U-Boot] [PATCH] sunxi: axp209: fix incorrect limits on ldo3

[Hans de Goede]

Hi,

On 25-03-15 17:03, Iain Paton wrote:
> board/sunxi/board.c tries to set ldo3 to 2.8v however drivers/power/axp209.c
> contains an incorrect limit on ldo3 of 2.275v
>
> The origin of the incorrect limit seems likely due to some inconsistencies
> in the axp209 datasheet. ldo3 is described with different limits in
> different sections. register 0x29 uses 7 bits for voltage configuration
> while the 2.275v limit would apply if only 6 bits were used.
> Probably this is a cut&paste error from register 0x23
>
> The linux kernel driver has the correct limit and operation up to the 2.8v
> required by my board has been physically verified with a multimeter.
>
> Signed-off-by: Iain Paton <ipaton0 at gmail.com>

Thanks, I've merged this into u-boot-sunxi/master and added this
in a small fixed pull-req which I've just send.

Regards,

Hans

> ---
>   drivers/power/axp209.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/power/axp209.c b/drivers/power/axp209.c
> index 4565398..f8c9b77 100644
> --- a/drivers/power/axp209.c
> +++ b/drivers/power/axp209.c
> @@ -119,7 +119,7 @@ int axp209_set_ldo3(int mvolt)
>   	if (mvolt == -1)
>   		cfg = 0x80;	/* determined by LDO3IN pin */
>   	else
> -		cfg = axp209_mvolt_to_cfg(mvolt, 700, 2275, 25);
> +		cfg = axp209_mvolt_to_cfg(mvolt, 700, 3500, 25);
>
>   	return axp209_write(AXP209_LDO3_VOLTAGE, cfg);
>   }
>