RE: [PATCHv5 3/3] mmc: dw_mmc: Use phandle to get SDR timing values from sys-mgr

[Seungwon Jeon <tgih.jun@samsung.com>]

On Saturday, August 24, 2013, Dinh Nguyen wrote:
> From: Dinh Nguyen <dinguyen@altera.com>
> 
> Update the driver to get the system manager node from a phandle. Also, the
> driver can get the correct clock value from the common clock API, thus the
> "altr,dw-mshc-ciu-div" binding is not needed at all.
> 
> Signed-off-by: Dinh Nguyen <dinguyen@altera.com>
> Cc: Jaehoon Chung <jh80.chung@samsung.com>
> Cc: Seungwon Jeon <tgih.jun@samsung.com>
> Cc: Rob Herring <rob.herring@calxeda.com>
> Cc: Pawel Moll <pawel.moll@arm.com>
> Cc: Mark Rutland <mark.rutland@arm.com>
> Cc: Stephen Warren <swarren@wwwdotorg.org>
> Cc: Ian Campbell <ian.campbell@citrix.com>
> Cc: Chris Ball <cjb@laptop.org>
> Cc: devicetree@vger.kernel.org
> Cc: linux-mmc@vger.kernel.org
> CC: linux-arm-kernel@lists.infradead.org
> 
> v2:
> - Use "altr,ciu-clk-offset" to get the correct CIU clock values to be
>   set in the system manager.
> ---
>  drivers/mmc/host/dw_mmc-socfpga.c |   33 +++++++++++++++------------------
>  1 file changed, 15 insertions(+), 18 deletions(-)
> 
> diff --git a/drivers/mmc/host/dw_mmc-socfpga.c b/drivers/mmc/host/dw_mmc-socfpga.c
> index 14b5961..cfd67e1 100644
> --- a/drivers/mmc/host/dw_mmc-socfpga.c
> +++ b/drivers/mmc/host/dw_mmc-socfpga.c
> @@ -24,21 +24,20 @@
>  #include "dw_mmc.h"
>  #include "dw_mmc-pltfm.h"
> 
> -#define SYSMGR_SDMMCGRP_CTRL_OFFSET		0x108
> -#define DRV_CLK_PHASE_SHIFT_SEL_MASK	0x7
> -#define SYSMGR_SDMMC_CTRL_SET(smplsel, drvsel)          \
> -	((((smplsel) & 0x7) << 3) | (((drvsel) & 0x7) << 0))
> +#define DRV_CLK_PHASE_SHIFT_SEL_MASK   0x7
> 
>  /* SOCFPGA implementation specific driver private data */
>  struct dw_mci_socfpga_priv_data {
> -	u8	ciu_div; /* card interface unit divisor */
>  	u32	hs_timing; /* bitmask for CIU clock phase shift */
>  	struct regmap   *sysreg; /* regmap for system manager register */
> +	/* Offset for the ciu clock setting register inside the system manager.*/
> +	u32     ciu_clk_offset;
>  };
> 
>  static int dw_mci_socfpga_priv_init(struct dw_mci *host)
>  {
>  	struct dw_mci_socfpga_priv_data *priv;
> +	struct device_node *np = host->dev->of_node;
> 
>  	priv = devm_kzalloc(host->dev, sizeof(*priv), GFP_KERNEL);
>  	if (!priv) {
> @@ -46,9 +45,9 @@ static int dw_mci_socfpga_priv_init(struct dw_mci *host)
>  		return -ENOMEM;
>  	}
> 
> -	priv->sysreg = syscon_regmap_lookup_by_compatible("altr,sys-mgr");
> +	priv->sysreg = syscon_regmap_lookup_by_phandle(np, "altr,sysmgr");
>  	if (IS_ERR(priv->sysreg)) {
> -		dev_err(host->dev, "regmap for altr,sys-mgr lookup failed.\n");
> +		dev_err(host->dev, "No sysmgr phandle specified!\n");
>  		return PTR_ERR(priv->sysreg);
>  	}
>  	host->priv = priv;
> @@ -61,11 +60,8 @@ static int dw_mci_socfpga_setup_clock(struct dw_mci *host)
>  	struct dw_mci_socfpga_priv_data *priv = host->priv;
> 
>  	clk_disable_unprepare(host->ciu_clk);
> -	regmap_write(priv->sysreg, SYSMGR_SDMMCGRP_CTRL_OFFSET,
> -		priv->hs_timing);
> +	regmap_write(priv->sysreg, priv->ciu_clk_offset, priv->hs_timing);
>  	clk_prepare_enable(host->ciu_clk);
> -
> -	host->bus_hz /= (priv->ciu_div + 1);
>  	return 0;
>  }
> 
> @@ -82,20 +78,21 @@ static int dw_mci_socfpga_parse_dt(struct dw_mci *host)
>  	struct dw_mci_socfpga_priv_data *priv = host->priv;
>  	struct device_node *np = host->dev->of_node;
>  	u32 timing[2];
> -	u32 div = 0;
> +	u32 offset[3];
>  	int ret;
> 
> -	ret = of_property_read_u32(np, "altr,dw-mshc-ciu-div", &div);
> -	if (ret)
> -		dev_info(host->dev, "No dw-mshc-ciu-div specified, assuming 1");
> -	priv->ciu_div = div;
> -
>  	ret = of_property_read_u32_array(np,
>  			"altr,dw-mshc-sdr-timing", timing, 2);
>  	if (ret)
>  		return ret;
> 
> -	priv->hs_timing = SYSMGR_SDMMC_CTRL_SET(timing[0], timing[1]);
> +	ret = of_property_read_u32_array(np, "altr,ciu-clk-offset", offset, 3);
> +	if (ret)
> +		return ret;
> +
> +	priv->ciu_clk_offset = offset[0];
> +	priv->hs_timing =
> +		((((timing[0]) & 0x7) << offset[2]) | (((timing[1]) & 0x7) << offset[1]));
offset should be gotten from DT?
These are variable?

Thanks,
Seungwon Jeon

>  	return 0;
>  }
> 
> --
> 1.7.9.5
> 
> 
> --
> To unsubscribe from this list: send the line "unsubscribe linux-mmc" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html