linux-kernel - Re: [PATCH v2] mtd: spi-nor: atmel: add at25sf321 entry

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Message-ID: <7a370586-203d-4e3b-827c-82e4306ae69d@linaro.org>
Date: Tue, 29 Oct 2024 13:35:03 +0000
From: Tudor Ambarus <tudor.ambarus@...aro.org>
To: Marcus Folkesson <marcus.folkesson@...il.com>
Cc: Pratyush Yadav <pratyush@...nel.org>, Michael Walle <mwalle@...nel.org>,
 Miquel Raynal <miquel.raynal@...tlin.com>,
 Richard Weinberger <richard@....at>, Vignesh Raghavendra <vigneshr@...com>,
 Nicolas Ferre <nicolas.ferre@...rochip.com>,
 Alexandre Belloni <alexandre.belloni@...tlin.com>,
 Claudiu Beznea <claudiu.beznea@...on.dev>, linux-mtd@...ts.infradead.org,
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] mtd: spi-nor: atmel: add at25sf321 entry



On 10/29/24 1:16 PM, Marcus Folkesson wrote:
> Hi Tudor,
> 

Hi!

> On Tue, Oct 29, 2024 at 11:36:17AM +0000, Tudor Ambarus wrote:
>>
>>
>> On 10/29/24 11:23 AM, Marcus Folkesson wrote:
>>> Add entry for the at25sf321 32Mbit SPI flash.
>>>
>>> This flash is populated on a custom board and was tested at
>>> 10MHz frequency using the "ti,da830-spi" SPI controller.
>>>
>>
>> no sfdp for this one?
> 
> No SFDP for this one!
>>
>>> Link:
>>> https://www.renesas.com/en/document/dst/at25sf321-datasheet?r=1608801
>>>
>>> Signed-off-by: Marcus Folkesson <marcus.folkesson@...il.com>
>>> ---
> 
> [...]
> 
>>> diff --git a/drivers/mtd/spi-nor/atmel.c b/drivers/mtd/spi-nor/atmel.c
>>> index 45d1153a04a07b7c61f46b117311b24ab695038f..8285a16b253d54ae8c4a5302850244d2248aa755 100644
>>> --- a/drivers/mtd/spi-nor/atmel.c
>>> +++ b/drivers/mtd/spi-nor/atmel.c
>>> @@ -238,6 +238,11 @@ static const struct flash_info atmel_nor_parts[] = {
>>>  		.flags = SPI_NOR_HAS_LOCK,
>>>  		.no_sfdp_flags = SECT_4K,
>>>  		.fixups = &at25fs_nor_fixups
>>> +	}, {
>>> +		.id = SNOR_ID(0x1f, 0x87, 0x01),
>>> +		.name = "at25sf321",
>>> +		.size = SZ_4M,
>>> +		.no_sfdp_flags = SECT_4K,
>>
>> it seems this flash supports dual and quad reads. Do you care to
>> add/test these modes?
>>
>> you'll need mtd-utils
> 
> Sure, not sure how I test it though.
> I've added mtd-utils but I do not see any good parameters to set mode?

Ah, you can't specify the width at runtime.

In SPI NOR you need to update your flash entry to contain:
	.no_sfdp_flags = SECT_4K | SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ,

then in your device tree you can set dual mode by doing
spi-tx-bus-width = <2>;
spi-rx-bus-width = <2>;

For quad you set the tx/rx widths to 4.

Do a cat /sys/kernel/debug/spi-nor/spi0.0/params to see what params get
set. You need to do the tests from
https://docs.kernel.org/driver-api/mtd/spi-nor.html, starting with
section "3 Dump debugfs data", for each of the dual/quad modes.

Cheers,
ta