Message-ID: <VI1PR04MB4015E5BA7BE9763A105AD47D95A20@VI1PR04MB4015.eurprd04.prod.outlook.com>
Date:   Thu, 29 Aug 2019 07:47:32 +0000
From:   Ashish Kumar <ashish.kumar@....com>
To:     "Tudor.Ambarus@...rochip.com" <Tudor.Ambarus@...rochip.com>,
        "marek.vasut@...il.com" <marek.vasut@...il.com>,
        "dwmw2@...radead.org" <dwmw2@...radead.org>,
        "computersforpeace@...il.com" <computersforpeace@...il.com>,
        "miquel.raynal@...tlin.com" <miquel.raynal@...tlin.com>,
        "richard@....at" <richard@....at>,
        "vigneshr@...com" <vigneshr@...com>,
        "linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>
CC:     Kuldeep Singh <kuldeep.singh@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [EXT] Re: [Patch v3] drivers: mtd: spi-nor: Add flash property
 for mt25qu512a and mt35xu02g



> -----Original Message-----
> From: linux-mtd <linux-mtd-bounces@...ts.infradead.org> On Behalf Of
> Tudor.Ambarus@...rochip.com
> Sent: Tuesday, August 27, 2019 5:34 PM
> To: Ashish Kumar <ashish.kumar@....com>; marek.vasut@...il.com;
> dwmw2@...radead.org; computersforpeace@...il.com;
> miquel.raynal@...tlin.com; richard@....at; vigneshr@...com; linux-
> mtd@...ts.infradead.org
> Cc: Kuldeep Singh <kuldeep.singh@....com>; linux-kernel@...r.kernel.org
> Subject: [EXT] Re: [Patch v3] drivers: mtd: spi-nor: Add flash property for
> mt25qu512a and mt35xu02g
> 
> Caution: EXT Email
> 
> Hi, Ashish,
> 
> On 08/13/2019 01:38 PM, Ashish Kumar wrote:
> > External E-Mail
> >
> >
> > mt25qu512a is rebranded after its spinoff from STM, so it is different
> > only in term of operating frequency, initial JEDEC id is same as that
> > of n25q512a. In order to avoid any confussion with respect to name new
> > entry is added.
> > This flash is tested for Single I/O and QUAD I/O mode on LS1046FRWY.
> >
> > mt35xu02g is Octal flash supporting Single I/O and QCTAL I/O and it
> > has been tested on LS1028ARDB
> >
> > Signed-off-by: Kuldeep Singh <kuldeep.singh@....com>
> > Signed-off-by: Ashish Kumar <ashish.kumar@....com>
> > ---
> > v3:
> > -Reword commits msg
> > -rebase to top of mtd-linux spi-nor/next
> > v2:
> > Incorporate review comments from Vignesh
> >
> >  drivers/mtd/spi-nor/spi-nor.c | 9 +++++++++
> >  1 file changed, 9 insertions(+)
> >
> > diff --git a/drivers/mtd/spi-nor/spi-nor.c
> > b/drivers/mtd/spi-nor/spi-nor.c index 03cc788..97d3de8 100644
> > --- a/drivers/mtd/spi-nor/spi-nor.c
> > +++ b/drivers/mtd/spi-nor/spi-nor.c
> > @@ -1988,6 +1988,12 @@ static const struct flash_info spi_nor_ids[] = {
> >       { "n25q128a13",  INFO(0x20ba18, 0, 64 * 1024,  256, SECT_4K |
> SPI_NOR_QUAD_READ) },
> >       { "n25q256a",    INFO(0x20ba19, 0, 64 * 1024,  512, SECT_4K |
> SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ) },
> >       { "n25q256ax1",  INFO(0x20bb19, 0, 64 * 1024,  512, SECT_4K |
> > SPI_NOR_QUAD_READ) },
> > +
> > +     /* Micron */
> > +     { "mt25qu512a", INFO6(0x20bb20, 0x104400, 64 * 1024, 1024, SECT_4K |
> > +                             USE_FSR | SPI_NOR_DUAL_READ |
> > +                             SPI_NOR_QUAD_READ | SPI_NOR_4B_OPCODES)
> > + },
> 
> I'm looking at the following datasheets: mt25qu512a [1] and n25q512a [2].
> Both flashes have the same Extended Device ID data. What will happen, is
> that you'll always hit the first valid entry, so "mt25qu512a", and you'll indicate
> a 'wrong' flash name for n25q512a. If there is nothing that differentiate
> between the two, maybe you can add a comment in the code that says that
> "n25q512a" was re-branded to "mt25qu512a" after the STM spin-off.
> Whatever solution will be, it will be better if you do it in a separate patch.
Hi Tudor,
Considering both are same, should I rename to mt25qu51a, and add SPI_NOR_4B_OPCODES or
Keep n25q512a, and comment about mt25qu51a  and add SPI_NOR_4B_OPCODES.

For separate patch comment you mean split mt25qu512a and mt35xu02g into 2 patch.

> 
> [1]
> https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fstatic
> 6.arrow.com%2Faropdfconversion%2F1a8b08cb08427821f166137d064c4837e
> ca70f15%2F12682797700728481268266842945946mt25q_qlkt_u_512_abb_0.p
> df.pdf&amp;data=02%7C01%7Cashish.kumar%40nxp.com%7C26e59cbcfac14
> 8e5218c08d72ae6c46b%7C686ea1d3bc2b4c6fa92cd99c5c301635%7C0%7C1%7
> C637025042940681828&amp;sdata=gWBeML98ws80FAnwA7nvB4qvVbFWUa
> YTyr8PV6IUP3A%3D&amp;reserved=0
> 
> [2]
> https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww
> .google.com%2Furl%3Fsa%3Dt%26rct%3Dj%26q%3D%26esrc%3Ds%26source
> %3Dweb%26cd%3D1%26cad%3Drja%26uact%3D8%26ved%3D2ahUKEwjZlJ_
> M_KLkAhWB66QKHV6WAX4QFjAAegQIAhAC%26url%3Dhttps%253A%252F%
> 252Fwww.micron.com%252F-
> %252Fmedia%252Fdocuments%252Fproducts%252Fdata-sheet%252Fnor-
> flash%252Fserial-
> nor%252Fn25q%252Fn25q_512mb_1_8v_65nm.pdf%26usg%3DAOvVaw3BSi
> UIfTgikFZ0FZ7O_D61&amp;data=02%7C01%7Cashish.kumar%40nxp.com%7C
> 26e59cbcfac148e5218c08d72ae6c46b%7C686ea1d3bc2b4c6fa92cd99c5c30163
> 5%7C0%7C1%7C637025042940681828&amp;sdata=0bbEjEbOWQJfVYhDjBx55
> d6YkDzgR2fP2XBurJvDrMU%3D&amp;reserved=0
> 
> > +
> >       { "n25q512a",    INFO(0x20bb20, 0, 64 * 1024, 1024, SECT_4K | USE_FSR |
> SPI_NOR_QUAD_READ) },
> >       { "n25q512ax3",  INFO(0x20ba20, 0, 64 * 1024, 1024, SECT_4K | USE_FSR
> | SPI_NOR_QUAD_READ) },
> >       { "n25q00",      INFO(0x20ba21, 0, 64 * 1024, 2048, SECT_4K | USE_FSR |
> SPI_NOR_QUAD_READ | NO_CHIP_ERASE) },
> > @@ -2003,6 +2009,9 @@ static const struct flash_info spi_nor_ids[] = {
> >                       SECT_4K | USE_FSR | SPI_NOR_OCTAL_READ |
> >                       SPI_NOR_4B_OPCODES)
> >       },
> > +     { "mt35xu02g",  INFO(0x2c5b1c, 0, 128 * 1024, 2048,
> > +                     SECT_4K | USE_FSR | SPI_NOR_OCTAL_READ |
> > +                     SPI_NOR_4B_OPCODES) },
> 
> Is there a public datasheet for this flash?
No,  data sheet in under NDA, I have asked micron FAE for public data sheet, will resend after the same is published. 

Regards
Ashish 
> 
> Cheers,
> ta
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