linux-kernel - Re: [PATCH v4 2/7] mtd: spi-nor: sfdp: parse xSPI Profile 1.0 table

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Message-ID: <OF5D2955E6.5ACFFC6F-ON482585A4.00200EDE-482585A4.00204686@mxic.com.tw>
Date:   Mon, 13 Jul 2020 13:52:32 +0800
From:   masonccyang@...c.com.tw
To:     ycllin@...c.com.tw
Cc:     boris.brezillon@...labora.com, broonie@...nel.org,
        juliensu@...c.com.tw, linux-kernel@...r.kernel.org,
        linux-mtd@...ts.infradead.org, linux-spi@...r.kernel.org,
        matthias.bgg@...il.com, miquel.raynal@...tlin.com, p.yadav@...com,
        richard@....at, tudor.ambarus@...rochip.com, vigneshr@...com
Subject: Re: [PATCH v4 2/7] mtd: spi-nor: sfdp: parse xSPI Profile 1.0 table

+ YC Lin in loop,

--
> 
> Subject
> 
> [PATCH v4 2/7] mtd: spi-nor: sfdp: parse xSPI Profile 1.0 table
> 
> JESD251, xSPI profile 1.0 table supports octal DTR mode.
> Extract information like the fast read opcode, dummy cycles for various
> frequencies, the number of dummy cycles needed for a Read Status
> Register command, the number of address bytes needed for a Read
> Status Register command, read volatile register command and write
> volatile register command.
> 
> According to BFPT 20th DWORD of octal maximum speed, driver get it's
> specific dummy cycles from profile 1.0 table and then could update
> it to device by their fixup hooks.
> 
> Since driver get octal DTR read opcode and then set read settings,
> expose spi_nor_set_read_settings() in core.h.
> 
> Signed-off-by: Mason Yang <masonccyang@...c.com.tw>
> ---

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