linux-kernel - Re: [PATCH V4] mtd: spi-nor: winbond: Add support for winbond chip

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Date:   Thu, 20 Jan 2022 15:42:21 +0530
From:   Pratyush Yadav <p.yadav@...com>
To:     Shaik Sajida Bhanu <quic_c_sbhanu@...cinc.com>
CC:     <dianders@...omium.org>, <tudor.ambarus@...rochip.com>,
        <michael@...le.cc>, <miquel.raynal@...tlin.com>, <richard@....at>,
        <vigneshr@...com>, <linux-mtd@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <stummala@...eaurora.org>,
        <vbadigan@...eaurora.org>, <quic_rampraka@...cinc.com>,
        <quic_pragalla@...cinc.com>, <sartgarg@...eaurora.org>
Subject: Re: [PATCH V4] mtd: spi-nor: winbond: Add support for winbond chip

Hi,

On 20/01/22 03:24PM, Shaik Sajida Bhanu wrote:
> Add support for winbond W25Q512NW-IM chip.
> 
> Signed-off-by: Shaik Sajida Bhanu <quic_c_sbhanu@...cinc.com>
> Reviewed-by: Doug Anderson <dianders@...omium.org>
> ---
> 
> Changes since V1:
> 	- Added space before name of the flash part as suggested by Doug.
> 
> Changes since V2:
> 	- Updated chip name as w25q512nwm as suggested by Doug.
> 
> Changes since V3:
> 	- Updated flash_info flags passing according to below patch
> 	 https://lore.kernel.org/all/20211207140254.87681-7-tudor.ambarus@microchip.com/
> 	 As suggested by Tudor Ambarus.
> ---
>  drivers/mtd/spi-nor/winbond.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/mtd/spi-nor/winbond.c b/drivers/mtd/spi-nor/winbond.c
> index 675f32c..c4be225 100644
> --- a/drivers/mtd/spi-nor/winbond.c
> +++ b/drivers/mtd/spi-nor/winbond.c
> @@ -124,6 +124,10 @@ static const struct flash_info winbond_parts[] = {
>  	{ "w25m512jv", INFO(0xef7119, 0, 64 * 1024, 1024)
>  		NO_SFDP_FLAGS(SECT_4K | SPI_NOR_QUAD_READ |
>  			      SPI_NOR_DUAL_READ) },
> +	{ "w25q512nwm", INFO(0xef8020, 0, 64 * 1024, 1024)
> +		FLAGS(SPI_NOR_HAS_LOCK | SPI_NOR_HAS_TB)
> +		NO_SFDP_FLAGS(SECT_4K | SPI_NOR_DUAL_READ |
> +			      SPI_NOR_QUAD_READ) },

This way is for "legacy" flash code and is not recommended anymore. Does 
the flash support SFDP? In that case just add PARSE_SFDP and let the 
SFDP parser discover these capabilities. You can keep the "FLAGS" part 
since those are not discoverable via SFDP.

>  	{ "w25q512jvq", INFO(0xef4020, 0, 64 * 1024, 1024)
>  		NO_SFDP_FLAGS(SECT_4K | SPI_NOR_DUAL_READ |
>  			      SPI_NOR_QUAD_READ) },
> -- 
> QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member 
> of Code Aurora Forum, hosted by The Linux Foundation
> 

-- 
Regards,
Pratyush Yadav
Texas Instruments Inc.