linux-kernel - Re: [PATCH 2/2] mtd: spi-nor: macronix: Add support for mx66lm1g45g

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Message-ID: <3c848db7-dc76-5d7b-3131-b6b857230d7f@microchip.com>
Date:   Thu, 9 Dec 2021 17:23:15 +0000
From:   <Tudor.Ambarus@...rochip.com>
To:     <p.yadav@...com>, <michael@...le.cc>
CC:     <vigneshr@...com>, <miquel.raynal@...tlin.com>, <richard@....at>,
        <linux-mtd@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        <Nicolas.Ferre@...rochip.com>, <zhengxunli@...c.com.tw>,
        <jaimeliao@...c.com.tw>
Subject: Re: [PATCH 2/2] mtd: spi-nor: macronix: Add support for mx66lm1g45g

On 12/9/21 7:21 PM, Tudor Ambarus wrote:
> mx66lm1g45g supports just 1-1-1, 8-8-8 and 8d-8d-8d modes. There are
> versions of mx66lm1g45g which do not support SFDP, thus use
> SPI_NOR_SKIP_SFDP. The RDID command issued through the octal peripheral
> interface outputs data always in STR mode for whatever reason. Since
> 8d-8d-8s is not common, avoid reading the ID when enabling the octal dtr
> mode. Instead, read back the CR2 to check if the switch was successful.
> Tested in 1-1-1 and 8d-8d-8d modes using sama7g5 QSPI IP.
> 
> Signed-off-by: Tudor Ambarus <tudor.ambarus@...rochip.com>
> ---
>

# cat /sys/devices/platform/soc/e080c000.spi/spi_master/spi1/spi1.0/spi-nor/jedec_id
c2853b
# cat /sys/devices/platform/soc/e080c000.spi/spi_master/spi1/spi1.0/spi-nor/manufacturer
macronix
# cat /sys/devices/platform/soc/e080c000.spi/spi_master/spi1/spi1.0/spi-nor/partname
mx66lm1g45g
# cat /sys/devices/platform/soc/e080c000.spi/spi_master/spi1/spi1.0/spi-nor/sfdp
cat: can't open '/sys/devices/platform/soc/e080c000.spi/spi_master/spi1/spi1.0/spi-nor/sfdp': No such file or directory