linux-kernel - Re: [PATCH] mtd: spi-nor: core: Check read CR support

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Message-ID: <87frcucy3p.fsf@bootlin.com>
Date: Wed, 10 Sep 2025 14:04:42 +0200
From: Miquel Raynal <miquel.raynal@...tlin.com>
To: Jakub Czapiga <czapiga@...gle.com>
Cc: Tudor Ambarus <tudor.ambarus@...aro.org>,  Pratyush Yadav
 <pratyush@...nel.org>,  Michael Walle <mwalle@...nel.org>,  Richard
 Weinberger <richard@....at>,  Vignesh Raghavendra <vigneshr@...com>,
  linux-mtd@...ts.infradead.org,  linux-kernel@...r.kernel.org,  Konrad
 Adamczyk <konrada@...gle.com>,  Adeel Arshad <adeel.arshad@...el.com>,
  Mika Westerberg <mika.westerberg@...ux.intel.com>
Subject: Re: [PATCH] mtd: spi-nor: core: Check read CR support

Hi Jakub,

> diff --git a/drivers/mtd/spi-nor/core.c b/drivers/mtd/spi-nor/core.c
> index ac4b960101cc..79deee3a50d3 100644
> --- a/drivers/mtd/spi-nor/core.c
> +++ b/drivers/mtd/spi-nor/core.c
> @@ -2608,6 +2608,10 @@ static int spi_nor_setup(struct spi_nor *nor,
>  		}
>  	}
>  
> +	/* Some SPI controllers might not support CR read opcode. */
> +	if (spi_nor_read_cr(nor, nor->bouncebuf) == -EOPNOTSUPP)

There is a spi_nor_spimem_check_op() helper which might be better suited
for this purpose?

Thanks,
Miquèl