Re: [PATCH 05/10] mtd: rawnand: fsl_upm: Use platform_get_resource() + devm_ioremap_resource()

[Miquel Raynal <miquel.raynal@bootlin.com>]

Boris Brezillon <boris.brezillon@collabora.com> wrote on Wed,  3 Jun
2020 15:49:17 +0200:

> Replace the of_address_to_resource() + devm_ioremap() calls by
> platform_get_resource() + devm_ioremap_resource() ones which allows us
> to get rid of one error message since devm_ioremap_resource() already
> takes care of that.
> 
> Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
> ---
>  drivers/mtd/nand/raw/fsl_upm.c | 23 +++++++----------------
>  1 file changed, 7 insertions(+), 16 deletions(-)
> 
> diff --git a/drivers/mtd/nand/raw/fsl_upm.c b/drivers/mtd/nand/raw/fsl_upm.c
> index a3e3a968891d..54851e9ea784 100644
> --- a/drivers/mtd/nand/raw/fsl_upm.c
> +++ b/drivers/mtd/nand/raw/fsl_upm.c
> @@ -14,7 +14,6 @@
>  #include <linux/mtd/nand_ecc.h>
>  #include <linux/mtd/partitions.h>
>  #include <linux/mtd/mtd.h>
> -#include <linux/of_address.h>
>  #include <linux/of_platform.h>
>  #include <linux/of_gpio.h>
>  #include <linux/io.h>
> @@ -197,7 +196,7 @@ static int fun_chip_init(struct fsl_upm_nand *fun,
>  static int fun_probe(struct platform_device *ofdev)
>  {
>  	struct fsl_upm_nand *fun;
> -	struct resource io_res;
> +	struct resource *io_res;
>  	const __be32 *prop;
>  	int rnb_gpio;
>  	int ret;
> @@ -208,13 +207,12 @@ static int fun_probe(struct platform_device *ofdev)
>  	if (!fun)
>  		return -ENOMEM;
>  
> -	ret = of_address_to_resource(ofdev->dev.of_node, 0, &io_res);
> -	if (ret) {
> -		dev_err(&ofdev->dev, "can't get IO base\n");
> -		return ret;
> -	}
> +	io_res = platform_get_resource(ofdev, IORESOURCE_MEM, 0);
> +	fun->io_base = devm_ioremap_resource(&ofdev->dev, io_res);

Why not even using devm_platform_ioremap_resource() resource directly?