[PATCH v4 2/5] clk: rockchip: Support MMC clocks in GRF region

[Heiko Stübner]

Hi,

Am Donnerstag, 17. April 2025, 16:36:44 Mitteleuropäische Sommerzeit schrieb Yao Zi:
> Registers of MMC drive/sample clocks in Rockchip RV1106 and RK3528
> locate in GRF regions. Adjust MMC clock code to support register
> operations through regmap. Also add a helper to ease registration of GRF
> clocks.
> 
> Signed-off-by: Yao Zi <ziyao at disroot.org>

> diff --git a/drivers/clk/rockchip/clk.c b/drivers/clk/rockchip/clk.c
> index cbf93ea119a9..ce2f3323d84e 100644
> --- a/drivers/clk/rockchip/clk.c
> +++ b/drivers/clk/rockchip/clk.c
> @@ -590,6 +590,7 @@ void rockchip_clk_register_branches(struct rockchip_clk_provider *ctx,
>  				list->name,
>  				list->parent_names, list->num_parents,
>  				ctx->reg_base + list->muxdiv_offset,
> +				NULL, 0,
>  				list->div_shift
>  			);
>  			break;
> @@ -619,6 +620,11 @@ void rockchip_clk_register_branches(struct rockchip_clk_provider *ctx,
>  			break;
>  		case branch_linked_gate:
>  			/* must be registered late, fall-through for error message */
> +		case branch_mmc_grf:
> +			/*
> +			 * must be registered through rockchip_clk_register_grf_branches,
> +			 * fall-through for error message
> +			 */
>  			break;

please don't create separate structures for specific clock-types.
Being able to "just define" clock branches is helpful and starting
to require separate blocks just causes issues down the road.

For handling multiple GRF sources, I just merged Nicolas' patches for
handling auxiliary GRFs [0] and GRF-gate clock type [1] .

So ideally, please base off from there.

Thanks a lot
Heiko


[0] https://git.kernel.org/pub/scm/linux/kernel/git/mmind/linux-rockchip.git/commit/?id=70a114daf2077472e58b3cac23ba8998e35352f4
[1] https://git.kernel.org/pub/scm/linux/kernel/git/mmind/linux-rockchip.git/commit/?id=e277168cabe9fd99e647f5dad0bc846d5d6b0093