linux-kernel - Re: [PATCH 6/6] mtd: spi-nor: sysfs: print JEDEC ID for generic flash driver

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Date:   Fri, 29 Jul 2022 10:25:19 +0900
From:   Takahiro Kuwano <tkuw584924@...il.com>
To:     Michael Walle <michael@...le.cc>,
        Tudor Ambarus <tudor.ambarus@...rochip.com>,
        Pratyush Yadav <p.yadav@...com>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>
Cc:     linux-kernel@...r.kernel.org, linux-mtd@...ts.infradead.org
Subject: Re: [PATCH 6/6] mtd: spi-nor: sysfs: print JEDEC ID for generic flash
 driver

On 5/13/2022 10:35 PM, Michael Walle wrote:
> We don't have a database entry for the generic SPI-NOR flash driver and
> thus we don't have a JEDEC ID to print. Print the (cached) JEDEC ID
> instead.
> 
> Signed-off-by: Michael Walle <michael@...le.cc>
> ---
>  drivers/mtd/spi-nor/sysfs.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/mtd/spi-nor/sysfs.c b/drivers/mtd/spi-nor/sysfs.c
> index 20563c1926f4..c09bb832b3b9 100644
> --- a/drivers/mtd/spi-nor/sysfs.c
> +++ b/drivers/mtd/spi-nor/sysfs.c
> @@ -35,8 +35,10 @@ static ssize_t jedec_id_show(struct device *dev,
>  	struct spi_device *spi = to_spi_device(dev);
>  	struct spi_mem *spimem = spi_get_drvdata(spi);
>  	struct spi_nor *nor = spi_mem_get_drvdata(spimem);
> +	const u8 *id = nor->info->id_len ? nor->info->id : nor->id;
> +	u8 id_len = nor->info->id_len ?: SPI_NOR_MAX_ID_LEN;
>  
> -	return sysfs_emit(buf, "%*phN\n", nor->info->id_len, nor->info->id);
> +	return sysfs_emit(buf, "%*phN\n", id_len, id);
>  }
>  static DEVICE_ATTR_RO(jedec_id);
>  
> @@ -76,7 +78,7 @@ static umode_t spi_nor_sysfs_is_visible(struct kobject *kobj,
>  
>  	if (attr == &dev_attr_manufacturer.attr && !nor->manufacturer)
>  		return 0;
> -	if (attr == &dev_attr_jedec_id.attr && !nor->info->id_len)
> +	if (attr == &dev_attr_jedec_id.attr && !nor->info->id_len && !nor->id)
>  		return 0;
>  
>  	return 0444;

Reviewed-by: Takahiro Kuwano <Takahiro.Kuwano@...ineon.com>