[PATCH 3/4] i2c: sun8i_rsb: Initialize chips in .child_pre_probe

[Andre Przywara]

On Thu, 17 Mar 2022 23:52:35 -0500
Samuel Holland <samuel at sholland.org> wrote:

Hi,

> Chips attached to the RSB bus require an initialization command before
> they can be used. (Specifically, this command programs the chip's
> runtime address.) The driver does this in its .probe_chip hook, under
> the assumption that .probe_chip is called during child probe. This is
> not the case; .probe_chip is only called by dm_i2c_probe, which is
> intended for use by board-level code, not for chips with OF nodes.
> 
> Since this initialization command must be run before a child chip can be
> used, do it before probing each child.
> 
> Signed-off-by: Samuel Holland <samuel at sholland.org>

Same as for patch 1/4:
currently that code path is not called by any sunxi code, so without
looking too deep or having the ability to test this, it looks alright to
me:

Acked-by: Andre Przywara <andre.przywara at arm.com>

Cheers,
Andre

> ---
> 
>  drivers/i2c/sun8i_rsb.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/i2c/sun8i_rsb.c b/drivers/i2c/sun8i_rsb.c
> index 716b245a00..0681e398f7 100644
> --- a/drivers/i2c/sun8i_rsb.c
> +++ b/drivers/i2c/sun8i_rsb.c
> @@ -252,11 +252,12 @@ static int sun8i_rsb_probe(struct udevice *bus)
>  static int sun8i_rsb_child_pre_probe(struct udevice *child)
>  {
>  	struct dm_i2c_chip *chip = dev_get_parent_plat(child);
> +	struct udevice *bus = child->parent;
>  
>  	/* Ensure each transfer is for a single register. */
>  	chip->flags |= DM_I2C_CHIP_RD_ADDRESS | DM_I2C_CHIP_WR_ADDRESS;
>  
> -	return 0;
> +	return sun8i_rsb_probe_chip(bus, chip->chip_addr, 0);
>  }
>  
>  static const struct dm_i2c_ops sun8i_rsb_ops = {