linux-kernel - Re: [PATCH v4 3/4] memory: omap-gpmc: Use a compatible match table when checking for NAND controller

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Message-ID: <51b8e895-95e1-0024-1457-ec534985c9f0@kernel.org>
Date:   Tue, 21 Dec 2021 22:01:28 +0200
From:   Roger Quadros <rogerq@...nel.org>
To:     krzysztof.kozlowski@...onical.com, miquel.raynal@...tlin.com,
        tony@...mide.com
Cc:     robh@...nel.org, kishon@...com, nm@...com, vigneshr@...com,
        linux-mtd@...ts.infradead.org, linux-omap@...r.kernel.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v4 3/4] memory: omap-gpmc: Use a compatible match table
 when checking for NAND controller

Hi Miquel,

On 21/12/2021 15:17, Roger Quadros wrote:
> As more compatibles can be added to the GPMC NAND controller driver
> use a compatible match table.
> 
> Cc: Miquel Raynal <miquel.raynal@...tlin.com>
> Signed-off-by: Roger Quadros <rogerq@...nel.org>
> ---
>  drivers/memory/omap-gpmc.c                   | 6 +++++-
>  drivers/mtd/nand/raw/omap2.c                 | 5 +----

Will need your Ack for this one as well. Thanks :)


>  include/linux/platform_data/mtd-nand-omap2.h | 9 ++++++++-
>  3 files changed, 14 insertions(+), 6 deletions(-)

cheers,
-roger

> 
> diff --git a/drivers/memory/omap-gpmc.c b/drivers/memory/omap-gpmc.c
> index 624153048182..d19ffc895e5b 100644
> --- a/drivers/memory/omap-gpmc.c
> +++ b/drivers/memory/omap-gpmc.c
> @@ -2091,6 +2091,7 @@ static int gpmc_probe_generic_child(struct platform_device *pdev,
>  	u32 val;
>  	struct gpio_desc *waitpin_desc = NULL;
>  	struct gpmc_device *gpmc = platform_get_drvdata(pdev);
> +	bool is_nand = false;
>  
>  	if (of_property_read_u32(child, "reg", &cs) < 0) {
>  		dev_err(&pdev->dev, "%pOF has no 'reg' property\n",
> @@ -2183,7 +2184,10 @@ static int gpmc_probe_generic_child(struct platform_device *pdev,
>  		}
>  	}
>  
> -	if (of_device_is_compatible(child, "ti,omap2-nand")) {
> +	if (of_match_node(omap_nand_ids, child))
> +		is_nand = true;
> +
> +	if (is_nand) {
>  		/* NAND specific setup */
>  		val = 8;
>  		of_property_read_u32(child, "nand-bus-width", &val);
> diff --git a/drivers/mtd/nand/raw/omap2.c b/drivers/mtd/nand/raw/omap2.c
> index b26d4947af02..e6dd8b4cf0d2 100644
> --- a/drivers/mtd/nand/raw/omap2.c
> +++ b/drivers/mtd/nand/raw/omap2.c
> @@ -2352,10 +2352,7 @@ static int omap_nand_remove(struct platform_device *pdev)
>  	return ret;
>  }
>  
> -static const struct of_device_id omap_nand_ids[] = {
> -	{ .compatible = "ti,omap2-nand", },
> -	{},
> -};
> +/* omap_nand_ids defined in linux/platform_data/mtd-nand-omap2.h */
>  MODULE_DEVICE_TABLE(of, omap_nand_ids);
>  
>  static struct platform_driver omap_nand_driver = {
> diff --git a/include/linux/platform_data/mtd-nand-omap2.h b/include/linux/platform_data/mtd-nand-omap2.h
> index de6ada739121..92f011805ad4 100644
> --- a/include/linux/platform_data/mtd-nand-omap2.h
> +++ b/include/linux/platform_data/mtd-nand-omap2.h
> @@ -7,6 +7,7 @@
>  #define	_MTD_NAND_OMAP2_H
>  
>  #include <linux/mtd/partitions.h>
> +#include <linux/mod_devicetable.h>
>  
>  #define	GPMC_BCH_NUM_REMAINDER	8
>  
> @@ -61,4 +62,10 @@ struct gpmc_nand_regs {
>  	void __iomem	*gpmc_bch_result5[GPMC_BCH_NUM_REMAINDER];
>  	void __iomem	*gpmc_bch_result6[GPMC_BCH_NUM_REMAINDER];
>  };
> -#endif
> +
> +static const struct of_device_id omap_nand_ids[] = {
> +	{ .compatible = "ti,omap2-nand", },
> +	{},
> +};
> +
> +#endif /* _MTD_NAND_OMAP2_H */
>