Re: [PATCH] mmc: sdhci-of-arasan: Use standard mmc_clk_phase_map infrastructure

[Michal Simek <michal.simek@amd.com>]

+Sai,

On 3/17/26 03:17, Shawn Lin wrote:
> Convert the Arasan SDHCI driver to use the mainline standard
> mmc_clk_phase_map infrastructure instead of custom clk_phase_in/out
> arrays as well as arasan_dt_read_clk_phase().
> 
> The phase values for ZynqMP, Versal, and Versal-NET platforms are
> still initialized from the predefined tables, but now follow the
> standard phase_map format with valid flag.
> 
> Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
> ---
> 
>   drivers/mmc/host/sdhci-of-arasan.c | 79 +++++++++-----------------------------
>   1 file changed, 18 insertions(+), 61 deletions(-)
> 
> diff --git a/drivers/mmc/host/sdhci-of-arasan.c b/drivers/mmc/host/sdhci-of-arasan.c
> index caf9723..b97d27c 100644
> --- a/drivers/mmc/host/sdhci-of-arasan.c
> +++ b/drivers/mmc/host/sdhci-of-arasan.c
> @@ -152,8 +152,7 @@ struct sdhci_arasan_clk_ops {
>    * @sdcardclk:		Pointer to normal 'struct clock' for sdcardclk_hw.
>    * @sampleclk_hw:	Struct for the clock we might provide to a PHY.
>    * @sampleclk:		Pointer to normal 'struct clock' for sampleclk_hw.
> - * @clk_phase_in:	Array of Input Clock Phase Delays for all speed modes
> - * @clk_phase_out:	Array of Output Clock Phase Delays for all speed modes
> + * @phase_map:		Struct for mmc_clk_phase_map provided.
>    * @set_clk_delays:	Function pointer for setting Clock Delays
>    * @clk_of_data:	Platform specific runtime clock data storage pointer
>    */
> @@ -162,8 +161,7 @@ struct sdhci_arasan_clk_data {
>   	struct clk      *sdcardclk;
>   	struct clk_hw	sampleclk_hw;
>   	struct clk      *sampleclk;
> -	int		clk_phase_in[MMC_TIMING_MMC_HS400 + 1];
> -	int		clk_phase_out[MMC_TIMING_MMC_HS400 + 1];
> +	struct mmc_clk_phase_map phase_map;
>   	void		(*set_clk_delays)(struct sdhci_host *host);
>   	void		*clk_of_data;
>   };
> @@ -1248,37 +1246,13 @@ static void sdhci_arasan_set_clk_delays(struct sdhci_host *host)
>   	struct sdhci_arasan_data *sdhci_arasan = sdhci_pltfm_priv(pltfm_host);
>   	struct sdhci_arasan_clk_data *clk_data = &sdhci_arasan->clk_data;
>   
> -	clk_set_phase(clk_data->sampleclk,
> -		      clk_data->clk_phase_in[host->timing]);
> -	clk_set_phase(clk_data->sdcardclk,
> -		      clk_data->clk_phase_out[host->timing]);
> -}
> -
> -static void arasan_dt_read_clk_phase(struct device *dev,
> -				     struct sdhci_arasan_clk_data *clk_data,
> -				     unsigned int timing, const char *prop)
> -{
> -	struct device_node *np = dev->of_node;
> -
> -	u32 clk_phase[2] = {0};
> -	int ret;
> -
> -	/*
> -	 * Read Tap Delay values from DT, if the DT does not contain the
> -	 * Tap Values then use the pre-defined values.
> -	 */
> -	ret = of_property_read_variable_u32_array(np, prop, &clk_phase[0],
> -						  2, 0);
> -	if (ret < 0) {
> -		dev_dbg(dev, "Using predefined clock phase for %s = %d %d\n",
> -			prop, clk_data->clk_phase_in[timing],
> -			clk_data->clk_phase_out[timing]);
> +	if (!clk_data->phase_map.phase[host->timing].valid)
>   		return;
> -	}
>   
> -	/* The values read are Input and Output Clock Delays in order */
> -	clk_data->clk_phase_in[timing] = clk_phase[0];
> -	clk_data->clk_phase_out[timing] = clk_phase[1];
> +	clk_set_phase(clk_data->sampleclk,
> +		      clk_data->phase_map.phase[host->timing].in_deg);
> +	clk_set_phase(clk_data->sdcardclk,
> +		      clk_data->phase_map.phase[host->timing].out_deg);
>   }
>   
>   /**
> @@ -1315,8 +1289,9 @@ static void arasan_dt_parse_clk_phases(struct device *dev,
>   		}
>   
>   		for (i = 0; i <= MMC_TIMING_MMC_HS400; i++) {
> -			clk_data->clk_phase_in[i] = zynqmp_iclk_phase[i];
> -			clk_data->clk_phase_out[i] = zynqmp_oclk_phase[i];
> +			clk_data->phase_map.phase[i].in_deg = zynqmp_iclk_phase[i];
> +			clk_data->phase_map.phase[i].out_deg = zynqmp_oclk_phase[i];
> +			clk_data->phase_map.phase[i].valid = true;
>   		}
>   	}
>   
> @@ -1327,8 +1302,9 @@ static void arasan_dt_parse_clk_phases(struct device *dev,
>   			VERSAL_OCLK_PHASE;
>   
>   		for (i = 0; i <= MMC_TIMING_MMC_HS400; i++) {
> -			clk_data->clk_phase_in[i] = versal_iclk_phase[i];
> -			clk_data->clk_phase_out[i] = versal_oclk_phase[i];
> +			clk_data->phase_map.phase[i].in_deg = versal_iclk_phase[i];
> +			clk_data->phase_map.phase[i].out_deg = versal_oclk_phase[i];
> +			clk_data->phase_map.phase[i].valid = true;
>   		}
>   	}
>   	if (of_device_is_compatible(dev->of_node, "xlnx,versal-net-emmc")) {
> @@ -1338,32 +1314,13 @@ static void arasan_dt_parse_clk_phases(struct device *dev,
>   			VERSAL_NET_EMMC_OCLK_PHASE;
>   
>   		for (i = 0; i <= MMC_TIMING_MMC_HS400; i++) {
> -			clk_data->clk_phase_in[i] = versal_net_iclk_phase[i];
> -			clk_data->clk_phase_out[i] = versal_net_oclk_phase[i];
> +			clk_data->phase_map.phase[i].in_deg = versal_net_iclk_phase[i];
> +			clk_data->phase_map.phase[i].out_deg = versal_net_oclk_phase[i];
> +			clk_data->phase_map.phase[i].valid = true;
>   		}
>   	}
> -	arasan_dt_read_clk_phase(dev, clk_data, MMC_TIMING_LEGACY,
> -				 "clk-phase-legacy");
> -	arasan_dt_read_clk_phase(dev, clk_data, MMC_TIMING_MMC_HS,
> -				 "clk-phase-mmc-hs");
> -	arasan_dt_read_clk_phase(dev, clk_data, MMC_TIMING_SD_HS,
> -				 "clk-phase-sd-hs");
> -	arasan_dt_read_clk_phase(dev, clk_data, MMC_TIMING_UHS_SDR12,
> -				 "clk-phase-uhs-sdr12");
> -	arasan_dt_read_clk_phase(dev, clk_data, MMC_TIMING_UHS_SDR25,
> -				 "clk-phase-uhs-sdr25");
> -	arasan_dt_read_clk_phase(dev, clk_data, MMC_TIMING_UHS_SDR50,
> -				 "clk-phase-uhs-sdr50");
> -	arasan_dt_read_clk_phase(dev, clk_data, MMC_TIMING_UHS_SDR104,
> -				 "clk-phase-uhs-sdr104");
> -	arasan_dt_read_clk_phase(dev, clk_data, MMC_TIMING_UHS_DDR50,
> -				 "clk-phase-uhs-ddr50");
> -	arasan_dt_read_clk_phase(dev, clk_data, MMC_TIMING_MMC_DDR52,
> -				 "clk-phase-mmc-ddr52");
> -	arasan_dt_read_clk_phase(dev, clk_data, MMC_TIMING_MMC_HS200,
> -				 "clk-phase-mmc-hs200");
> -	arasan_dt_read_clk_phase(dev, clk_data, MMC_TIMING_MMC_HS400,
> -				 "clk-phase-mmc-hs400");
> +
> +	mmc_of_parse_clk_phase(dev, &clk_data->phase_map);
>   }
>   
>   static const struct sdhci_pltfm_data sdhci_arasan_pdata = {

please take a look at this patch.
I was talking to him yesterday and he needs to finish two things before he has 
time to look at it. That's why please give him some time.

Thanks,
Michal