linux-kernel - Re: [PATCH] mtd: spi-nor: add support for Microchip 25LC256

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Message-ID: <d0d9d950-4566-40c6-a471-0ab6e3cc9524@gmail.com>
Date:   Fri, 4 May 2018 19:11:25 +0200
From:   Marek Vasut <marek.vasut@...il.com>
To:     Radu Pirea <radu.pirea@...rochip.com>,
        linux-kernel@...r.kernel.org, linux-mtd@...ts.infradead.org
Cc:     Zhiqiang.Hou@....com, pp@...ix.com, richard@....at,
        boris.brezillon@...tlin.com, computersforpeace@...il.com,
        dwmw2@...radead.org
Subject: Re: [PATCH] mtd: spi-nor: add support for Microchip 25LC256

On 05/04/2018 05:54 PM, Radu Pirea wrote:
> Added geometry description for Microchip 25LC256 memory.

Are you sure this is a SPI NOR ? I don't see any RDID instruction in the
datasheet, only some 6 instructions to read/write the array and lock it.
Isn't the AT25 driver a better fit for this EEPROM ?

> Signed-off-by: Radu Pirea <radu.pirea@...rochip.com>
> ---
>  drivers/mtd/devices/m25p80.c  | 3 +++
>  drivers/mtd/spi-nor/spi-nor.c | 3 +++
>  2 files changed, 6 insertions(+)
> 
> diff --git a/drivers/mtd/devices/m25p80.c b/drivers/mtd/devices/m25p80.c
> index a4e18f6aaa33..1e359d811261 100644
> --- a/drivers/mtd/devices/m25p80.c
> +++ b/drivers/mtd/devices/m25p80.c
> @@ -372,6 +372,9 @@ static const struct spi_device_id m25p_ids[] = {
>  	{ "mr25h10" },  /*   1 Mib, 40 MHz */
>  	{ "mr25h40" },  /*   4 Mib, 40 MHz */
>  
> +	/* Microchip */
> +	{ "25lc256" },
> +
>  	{ },
>  };
>  MODULE_DEVICE_TABLE(spi, m25p_ids);
> diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
> index d445a4d3b770..6341c86be647 100644
> --- a/drivers/mtd/spi-nor/spi-nor.c
> +++ b/drivers/mtd/spi-nor/spi-nor.c
> @@ -1076,6 +1076,9 @@ static const struct flash_info spi_nor_ids[] = {
>  	{ "mx66l1g45g",  INFO(0xc2201b, 0, 64 * 1024, 2048, SECT_4K | SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ) },
>  	{ "mx66l1g55g",  INFO(0xc2261b, 0, 64 * 1024, 2048, SPI_NOR_QUAD_READ) },
>  
> +	/* Microchip */
> +	{ "25lc256", CAT25_INFO(32 * 1024, 1, 64, 2, SPI_NOR_NO_ERASE | SPI_NOR_NO_FR) },
> +
>  	/* Micron */
>  	{ "n25q016a",	 INFO(0x20bb15, 0, 64 * 1024,   32, SECT_4K | SPI_NOR_QUAD_READ) },
>  	{ "n25q032",	 INFO(0x20ba16, 0, 64 * 1024,   64, SPI_NOR_QUAD_READ) },
> 


-- 
Best regards,
Marek Vasut