Re: [PATCH v5 1/8] mmc: sdhci-of-dwcmshc: add common bulk optional clocks support

[Adrian Hunter <adrian.hunter@intel.com>]

On 19/07/24 11:45, Chen Wang wrote:
> From: Chen Wang <unicorn_wang@outlook.com>
> 
> In addition to the required core clock and optional
> bus clock, the soc will expand its own clocks, so
> the bulk clock mechanism is abstracted.
> 
> Note, I call the bulk clocks as "other clocks" due
> to the bus clock has been called as "optional".
> 
> Signed-off-by: Chen Wang <unicorn_wang@outlook.com>
> ---
>  drivers/mmc/host/sdhci-of-dwcmshc.c | 91 ++++++++++++++++-------------
>  1 file changed, 49 insertions(+), 42 deletions(-)
> 
> diff --git a/drivers/mmc/host/sdhci-of-dwcmshc.c b/drivers/mmc/host/sdhci-of-dwcmshc.c
> index e79aa4b3b6c3..fb4076c19ed5 100644
> --- a/drivers/mmc/host/sdhci-of-dwcmshc.c
> +++ b/drivers/mmc/host/sdhci-of-dwcmshc.c
> @@ -108,7 +108,6 @@
>  #define DLL_LOCK_WO_TMOUT(x) \
>  	((((x) & DWCMSHC_EMMC_DLL_LOCKED) == DWCMSHC_EMMC_DLL_LOCKED) && \
>  	(((x) & DWCMSHC_EMMC_DLL_TIMEOUT) == 0))
> -#define RK35xx_MAX_CLKS 3
>  
>  /* PHY register area pointer */
>  #define DWC_MSHC_PTR_PHY_R	0x300
> @@ -199,23 +198,54 @@ enum dwcmshc_rk_type {
>  };
>  
>  struct rk35xx_priv {
> -	/* Rockchip specified optional clocks */
> -	struct clk_bulk_data rockchip_clks[RK35xx_MAX_CLKS];
>  	struct reset_control *reset;
>  	enum dwcmshc_rk_type devtype;
>  	u8 txclk_tapnum;
>  };
>  
> +#define DWCMSHC_MAX_OTHER_CLKS 3
> +
>  struct dwcmshc_priv {
>  	struct clk	*bus_clk;
>  	int vendor_specific_area1; /* P_VENDOR_SPECIFIC_AREA1 reg */
>  	int vendor_specific_area2; /* P_VENDOR_SPECIFIC_AREA2 reg */
>  
> +	int num_other_clks;
> +	struct clk_bulk_data other_clks[DWCMSHC_MAX_OTHER_CLKS];
> +
>  	void *priv; /* pointer to SoC private stuff */
>  	u16 delay_line;
>  	u16 flags;
>  };
>  
> +static int dwcmshc_get_enable_other_clks(struct device *dev,
> +					 struct dwcmshc_priv *priv,
> +					 int num_clks,
> +					 const char * const clk_ids[])
> +{
> +	int err;
> +
> +	if (num_clks > DWCMSHC_MAX_OTHER_CLKS)
> +		return -EINVAL;
> +
> +	for (int i = 0; i < num_clks; i++)
> +		priv->other_clks[i].id = clk_ids[i];
> +
> +	err = devm_clk_bulk_get_optional(dev, num_clks, priv->other_clks);
> +	if (err) {
> +		dev_err(dev, "failed to get clocks %d\n", err);
> +		return err;
> +	}
> +
> +	err = clk_bulk_prepare_enable(num_clks, priv->other_clks);
> +	if (err)
> +		dev_err(dev, "failed to enable clocks %d\n", err);
> +
> +	priv->num_other_clks = num_clks;
> +
> +	return err;
> +}
> +
>  /*
>   * If DMA addr spans 128MB boundary, we split the DMA transfer into two
>   * so that each DMA transfer doesn't exceed the boundary.
> @@ -1036,8 +1066,9 @@ static void dwcmshc_cqhci_init(struct sdhci_host *host, struct platform_device *
>  
>  static int dwcmshc_rk35xx_init(struct sdhci_host *host, struct dwcmshc_priv *dwc_priv)
>  {
> -	int err;
> +	static const char * const clk_ids[] = {"axi", "block", "timer"};
>  	struct rk35xx_priv *priv = dwc_priv->priv;
> +	int err;
>  
>  	priv->reset = devm_reset_control_array_get_optional_exclusive(mmc_dev(host->mmc));
>  	if (IS_ERR(priv->reset)) {
> @@ -1046,21 +1077,10 @@ static int dwcmshc_rk35xx_init(struct sdhci_host *host, struct dwcmshc_priv *dwc
>  		return err;
>  	}
>  
> -	priv->rockchip_clks[0].id = "axi";
> -	priv->rockchip_clks[1].id = "block";
> -	priv->rockchip_clks[2].id = "timer";
> -	err = devm_clk_bulk_get_optional(mmc_dev(host->mmc), RK35xx_MAX_CLKS,
> -					 priv->rockchip_clks);
> -	if (err) {
> -		dev_err(mmc_dev(host->mmc), "failed to get clocks %d\n", err);
> -		return err;
> -	}
> -
> -	err = clk_bulk_prepare_enable(RK35xx_MAX_CLKS, priv->rockchip_clks);
> -	if (err) {
> -		dev_err(mmc_dev(host->mmc), "failed to enable clocks %d\n", err);
> +	err = dwcmshc_get_enable_other_clks(mmc_dev(host->mmc), dwc_priv,
> +					    ARRAY_SIZE(clk_ids), clk_ids);
> +	if (err)
>  		return err;
> -	}
>  
>  	if (of_property_read_u8(mmc_dev(host->mmc)->of_node, "rockchip,txclk-tapnum",
>  				&priv->txclk_tapnum))
> @@ -1280,9 +1300,8 @@ static int dwcmshc_probe(struct platform_device *pdev)
>  err_clk:
>  	clk_disable_unprepare(pltfm_host->clk);
>  	clk_disable_unprepare(priv->bus_clk);
> -	if (rk_priv)
> -		clk_bulk_disable_unprepare(RK35xx_MAX_CLKS,
> -					   rk_priv->rockchip_clks);
> +	if (priv->num_other_clks)

'if (priv->num_other_clks)' is not necessary. clk_bulk_disable_unprepare()
does nothing if the number of clks is zero.

> +		clk_bulk_disable_unprepare(priv->num_other_clks, priv->other_clks);
>  free_pltfm:
>  	sdhci_pltfm_free(pdev);
>  	return err;
> @@ -1304,7 +1323,6 @@ static void dwcmshc_remove(struct platform_device *pdev)
>  	struct sdhci_host *host = platform_get_drvdata(pdev);
>  	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
>  	struct dwcmshc_priv *priv = sdhci_pltfm_priv(pltfm_host);
> -	struct rk35xx_priv *rk_priv = priv->priv;
>  
>  	pm_runtime_get_sync(&pdev->dev);
>  	pm_runtime_disable(&pdev->dev);
> @@ -1316,9 +1334,7 @@ static void dwcmshc_remove(struct platform_device *pdev)
>  
>  	clk_disable_unprepare(pltfm_host->clk);
>  	clk_disable_unprepare(priv->bus_clk);
> -	if (rk_priv)
> -		clk_bulk_disable_unprepare(RK35xx_MAX_CLKS,
> -					   rk_priv->rockchip_clks);
> +	clk_bulk_disable_unprepare(priv->num_other_clks, priv->other_clks);
>  	sdhci_pltfm_free(pdev);
>  }
>  
> @@ -1328,7 +1344,6 @@ static int dwcmshc_suspend(struct device *dev)
>  	struct sdhci_host *host = dev_get_drvdata(dev);
>  	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
>  	struct dwcmshc_priv *priv = sdhci_pltfm_priv(pltfm_host);
> -	struct rk35xx_priv *rk_priv = priv->priv;
>  	int ret;
>  
>  	pm_runtime_resume(dev);
> @@ -1347,9 +1362,7 @@ static int dwcmshc_suspend(struct device *dev)
>  	if (!IS_ERR(priv->bus_clk))
>  		clk_disable_unprepare(priv->bus_clk);
>  
> -	if (rk_priv)
> -		clk_bulk_disable_unprepare(RK35xx_MAX_CLKS,
> -					   rk_priv->rockchip_clks);
> +	clk_bulk_disable_unprepare(priv->num_other_clks, priv->other_clks);
>  
>  	return ret;
>  }
> @@ -1359,7 +1372,6 @@ static int dwcmshc_resume(struct device *dev)
>  	struct sdhci_host *host = dev_get_drvdata(dev);
>  	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
>  	struct dwcmshc_priv *priv = sdhci_pltfm_priv(pltfm_host);
> -	struct rk35xx_priv *rk_priv = priv->priv;
>  	int ret;
>  
>  	ret = clk_prepare_enable(pltfm_host->clk);
> @@ -1372,29 +1384,24 @@ static int dwcmshc_resume(struct device *dev)
>  			goto disable_clk;
>  	}
>  
> -	if (rk_priv) {
> -		ret = clk_bulk_prepare_enable(RK35xx_MAX_CLKS,
> -					      rk_priv->rockchip_clks);
> -		if (ret)
> -			goto disable_bus_clk;
> -	}
> +	ret = clk_bulk_prepare_enable(priv->num_other_clks, priv->other_clks);
> +	if (ret)
> +		goto disable_bus_clk;
>  
>  	ret = sdhci_resume_host(host);
>  	if (ret)
> -		goto disable_rockchip_clks;
> +		goto disable_other_clks;
>  
>  	if (host->mmc->caps2 & MMC_CAP2_CQE) {
>  		ret = cqhci_resume(host->mmc);
>  		if (ret)
> -			goto disable_rockchip_clks;
> +			goto disable_other_clks;
>  	}
>  
>  	return 0;
>  
> -disable_rockchip_clks:
> -	if (rk_priv)
> -		clk_bulk_disable_unprepare(RK35xx_MAX_CLKS,
> -					   rk_priv->rockchip_clks);
> +disable_other_clks:
> +	clk_bulk_disable_unprepare(priv->num_other_clks, priv->other_clks);
>  disable_bus_clk:
>  	if (!IS_ERR(priv->bus_clk))
>  		clk_disable_unprepare(priv->bus_clk);