Hi Prabhakar,

> +#define RPCIF_PHYADD		0x0070	/* R/W available on R-Car E3/D3/V3M and RZ/G2{E,L} */
> +#define RPCIF_PHYWR		0x0074	/* R/W available on R-Car E3/D3/V3M and RZ/G2{E,L} */

Nice detailed research, thanks! Minor nit: Keep the sorting
alphabetical: D3, E3, V3M.

> +static void rpcif_rzg2l_timing_adjust_sdr(struct rpcif *rpc)
> +{
> +	u32 data;
> +
> +	regmap_write(rpc->regmap, RPCIF_PHYWR, 0xa5390000);
> +	regmap_write(rpc->regmap, RPCIF_PHYADD, 0x80000000);
> +	regmap_write(rpc->regmap, RPCIF_PHYWR, 0x00008080);
> +	regmap_write(rpc->regmap, RPCIF_PHYADD, 0x80000022);
> +	regmap_write(rpc->regmap, RPCIF_PHYWR, 0x00008080);
> +	regmap_write(rpc->regmap, RPCIF_PHYADD, 0x80000024);
> +
> +	regmap_read(rpc->regmap, RPCIF_PHYCNT, &data);
> +	regmap_write(rpc->regmap, RPCIF_PHYCNT, data | RPCIF_PHYCNT_CKSEL(3));
> +	regmap_write(rpc->regmap, RPCIF_PHYWR, 0x00000030);
> +	regmap_write(rpc->regmap, RPCIF_PHYADD, 0x80000032);
> +}

Still magic values here. Don't you have them explained in your Gen3
documentation? It is tables 62.16 and 62.17 in my versions.

Other than these, looks good.

Thanks,

   Wolfram