linux-kernel - Re: [PATCH v2 11/25] mtd: nand: qcom: support for NAND controller properties

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Date:   Fri, 4 Aug 2017 14:39:54 +0200
From:   Boris Brezillon <boris.brezillon@...e-electrons.com>
To:     Abhishek Sahu <absahu@...eaurora.org>
Cc:     dwmw2@...radead.org, computersforpeace@...il.com,
        marek.vasut@...il.com, richard@....at, cyrille.pitchen@...ev4u.fr,
        robh+dt@...nel.org, mark.rutland@....com,
        linux-mtd@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        andy.gross@...aro.org, architt@...eaurora.org,
        sricharan@...eaurora.org
Subject: Re: [PATCH v2 11/25] mtd: nand: qcom: support for NAND controller
 properties

On Wed, 19 Jul 2017 17:17:59 +0530
Abhishek Sahu <absahu@...eaurora.org> wrote:

> Currently driver data is being assigned directly with ECC modes.
> Now, the plan is to add more NAND controller versions, so
> reorganized the current driver data assignment by creating NAND
> controller properties structure.  This will contain all
> properties specific to NAND controller.
> 
> Signed-off-by: Abhishek Sahu <absahu@...eaurora.org>
> ---
>  drivers/mtd/nand/qcom_nandc.c | 23 +++++++++++++++++------
>  1 file changed, 17 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/mtd/nand/qcom_nandc.c b/drivers/mtd/nand/qcom_nandc.c
> index 8f9e86c..3b0ae91 100644
> --- a/drivers/mtd/nand/qcom_nandc.c
> +++ b/drivers/mtd/nand/qcom_nandc.c
> @@ -235,7 +235,7 @@ struct nandc_regs {
>   *				writes. contains the register values to be
>   *				written to controller
>   * @cmd1/vld:			some fixed controller register values
> - * @ecc_modes:			supported ECC modes by the current controller,
> + * @props:			properties of current NAND controller IP,
>   *				initialized via DT match data
>   */
>  struct qcom_nand_controller {
> @@ -266,7 +266,7 @@ struct qcom_nand_controller {
>  	struct nandc_regs *regs;
>  
>  	u32 cmd1, vld;
> -	u32 ecc_modes;
> +	const struct qcom_props *props;
>  };
>  
>  /*
> @@ -319,6 +319,15 @@ struct qcom_nand_host {
>  	u32 clrreadstatus;
>  };
>  
> +/*
> + * This data type corresponds to the nand controller properties which varies
> + * among different NAND controller IP's.
> + * @ecc_modes - ecc mode for NAND
> + */
> +struct qcom_props {
> +	u32 ecc_modes;
> +};
> +
>  static inline struct qcom_nand_host *to_qcom_nand_host(struct nand_chip *chip)
>  {
>  	return container_of(chip, struct qcom_nand_host, chip);
> @@ -1820,7 +1829,7 @@ static int qcom_nand_host_setup(struct qcom_nand_host *host)
>  		 * uses lesser bytes for ECC. If RS is used, the ECC bytes is
>  		 * always 10 bytes
>  		 */
> -		if (nandc->ecc_modes & ECC_BCH_4BIT) {
> +		if (nandc->props->ecc_modes & ECC_BCH_4BIT) {
>  			/* BCH */
>  			host->bch_enabled = true;
>  			ecc_mode = 0;
> @@ -2165,7 +2174,7 @@ static int qcom_nandc_probe(struct platform_device *pdev)
>  		return -ENODEV;
>  	}
>  
> -	nandc->ecc_modes = (unsigned long)dev_data;
> +	nandc->props = dev_data;
>  
>  	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>  	nandc->base = devm_ioremap_resource(dev, res);
> @@ -2234,7 +2243,9 @@ static int qcom_nandc_remove(struct platform_device *pdev)
>  	return 0;
>  }
>  
> -#define EBI2_NANDC_ECC_MODES	(ECC_RS_4BIT | ECC_BCH_8BIT)
> +static const struct qcom_props ebi2_nandc_data = {
> +	.ecc_modes = (ECC_RS_4BIT | ECC_BCH_8BIT),

Just a nit: parenthesis are unneeded here.

> +};
>  
>  /*
>   * data will hold a struct pointer containing more differences once we support
> @@ -2242,7 +2253,7 @@ static int qcom_nandc_remove(struct platform_device *pdev)
>   */
>  static const struct of_device_id qcom_nandc_of_match[] = {
>  	{	.compatible = "qcom,ebi2-nandc",
> -		.data = (void *)EBI2_NANDC_ECC_MODES,
> +		.data = &ebi2_nandc_data,
>  	},
>  	{}
>  };