[PATCH] mtd: spi-nor: add support for GigaDevice GD25D05

Koen Vandeputte koen.vandeputte at ncentric.com
Tue Jan 14 01:13:52 PST 2020


On 11.01.20 16:52, Tudor.Ambarus at microchip.com wrote:
> Hi, Koen,
>
> On Monday, January 6, 2020 2:46:24 PM EET Koen Vandeputte wrote:
>> Tested on a MikroTik RB912UAG-5HPnD r2
>>
>> [    0.641714] m25p80 spi0.0: found gd25d05, expected m25p80
>> [    0.649916] m25p80 spi0.0: gd25d05 (64 Kbytes)
>> [    0.655122] Creating 4 MTD partitions on "spi0.0":
>> [    0.660164] 0x000000000000-0x00000000c000 : "routerboot"
>> [    0.667782] 0x00000000c000-0x00000000d000 : "hard_config"
>> [    0.675073] 0x00000000d000-0x00000000e000 : "bios"
>> [    0.682613] 0x00000000e000-0x00000000f000 : "soft_config"
> I'm afraid that this is not enough. You'll have to test all the flags that you
> advertised. Typically one should do a read, erase, write, read-back test, and
> then to exercise the lock and unlock features. If you want to be exhaustive,
> you can force the controller to do the reads in single, dual or quad modes,
> but if you choose to test just the best supported read mode, it is fine too.
> Please specify in the commit message what you tested.
>
> Cheers,
> ta
Hi Tudor,

Thanks for the guidance here as it's my first patch towards this part of 
the kernel.

I've not only went through the datasheet of this device, but also the 
datasheet from another very similar GD chip carrying the same specs
All features as indicated by the flags are clearly described in both 
datasheets. (like, Single, Dual, Quad modes)

The only delta is the amount of advertised blocks, and some other chip 
package details out-of-scope from electrical performance.

Is this clarification enough to send a V2 with a modified commit msg?

Please advice,
Thanks again,

Koen
>> Signed-off-by: Koen Vandeputte <koen.vandeputte at ncentric.com>
>> Cc: Miquel Raynal <miquel.raynal at bootlin.com>
>> Cc: Richard Weinberger <richard at nod.at>
>> Cc: Tudor Ambarus <tudor.ambarus at microchip.com>
>> Cc: Vignesh Raghavendra <vigneshr at ti.com>
>> ---
>>   drivers/mtd/spi-nor/spi-nor.c | 5 +++++
>>   1 file changed, 5 insertions(+)
>>
>> diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
>> index f4afe123e9dc..a34fa42d47a2 100644
>> --- a/drivers/mtd/spi-nor/spi-nor.c
>> +++ b/drivers/mtd/spi-nor/spi-nor.c
>> @@ -2346,6 +2346,11 @@ static const struct flash_info spi_nor_ids[] = {
>>   	{ "mb85rs1mt", INFO(0x047f27, 0, 128 * 1024, 1, SPI_NOR_NO_ERASE)
> },
>>   	/* GigaDevice */
>> +	{
>> +		"gd25d05", INFO(0xc84010, 0, 64 * 1024,  1,
>> +			SECT_4K | SPI_NOR_DUAL_READ |
> SPI_NOR_QUAD_READ |
>> +			SPI_NOR_HAS_LOCK | SPI_NOR_HAS_TB)
>> +	},
>>   	{
>>   		"gd25q16", INFO(0xc84015, 0, 64 * 1024,  32,
>>   			SECT_4K | SPI_NOR_DUAL_READ |
> SPI_NOR_QUAD_READ |
>
>
>



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