linux-kernel - Re: [PATCH v2 1/3] mtd: spinand: Add #define-s for page-read ops with three-byte addresses

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Date:   Wed, 15 May 2019 06:49:12 +0000
From:   Schrempf Frieder <frieder.schrempf@...tron.de>
To:     Marek Vasut <marek.vasut@...il.com>,
        Jeff Kletsky <lede@...ycomm.com>,
        Boris Brezillon <bbrezillon@...nel.org>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        "David Woodhouse" <dwmw2@...radead.org>,
        Brian Norris <computersforpeace@...il.com>
CC:     "linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 1/3] mtd: spinand: Add #define-s for page-read ops with
 three-byte addresses

On 15.05.19 08:17, Marek Vasut wrote:
> On 5/14/19 11:53 PM, Jeff Kletsky wrote:
>> From: Jeff Kletsky <git-commits@...ycomm.com>
> 
> That #define in $subject is called a macro.
> 
> Seems this patch adds a lot of almost duplicate code, can it be somehow
> de-duplicated ?

We could add another parameter naddr or addrlen to the 
SPINAND_PAGE_READ_FROM_CACHE_XX_OPs and pass the value 2 for all 
existing chips except for GD5F1GQ4UFxxG which needs 3 bytes address length.

This would cause one more argument to each of the macro calls in all 
chip drivers. As long as there are only two flavors (2 and 3 bytes) I'm 
not sure if this really would make things easier and also this is "only" 
preprocessor code.

So anyways, I would be fine with both approaches, Jeff's current one or 
one with another parameter for the address length.

By the way: Jeff, you didn't carry my Reviewed-by tag to v2. So I will 
just reply again to add the tags.

> 
>> The GigaDevice GD5F1GQ4UFxxG SPI NAND utilizes three-byte addresses
>> for its page-read ops.
>>
>> http://www.gigadevice.com/datasheet/gd5f1gq4xfxxg/
>>
>> Signed-off-by: Jeff Kletsky <git-commits@...ycomm.com>
>> ---
>>   include/linux/mtd/spinand.h | 30 ++++++++++++++++++++++++++++++
>>   1 file changed, 30 insertions(+)
>>
>> diff --git a/include/linux/mtd/spinand.h b/include/linux/mtd/spinand.h
>> index b92e2aa955b6..05fe98eebe27 100644
>> --- a/include/linux/mtd/spinand.h
>> +++ b/include/linux/mtd/spinand.h
>> @@ -68,30 +68,60 @@
>>   		   SPI_MEM_OP_DUMMY(ndummy, 1),				\
>>   		   SPI_MEM_OP_DATA_IN(len, buf, 1))
>>   
>> +#define SPINAND_PAGE_READ_FROM_CACHE_OP_3A(fast, addr, ndummy, buf, len) \
>> +	SPI_MEM_OP(SPI_MEM_OP_CMD(fast ? 0x0b : 0x03, 1),		\
>> +		   SPI_MEM_OP_ADDR(3, addr, 1),				\
>> +		   SPI_MEM_OP_DUMMY(ndummy, 1),				\
>> +		   SPI_MEM_OP_DATA_IN(len, buf, 1))
>> +
>>   #define SPINAND_PAGE_READ_FROM_CACHE_X2_OP(addr, ndummy, buf, len)	\
>>   	SPI_MEM_OP(SPI_MEM_OP_CMD(0x3b, 1),				\
>>   		   SPI_MEM_OP_ADDR(2, addr, 1),				\
>>   		   SPI_MEM_OP_DUMMY(ndummy, 1),				\
>>   		   SPI_MEM_OP_DATA_IN(len, buf, 2))
>>   
>> +#define SPINAND_PAGE_READ_FROM_CACHE_X2_OP_3A(addr, ndummy, buf, len)	\
>> +	SPI_MEM_OP(SPI_MEM_OP_CMD(0x3b, 1),				\
>> +		   SPI_MEM_OP_ADDR(3, addr, 1),				\
>> +		   SPI_MEM_OP_DUMMY(ndummy, 1),				\
>> +		   SPI_MEM_OP_DATA_IN(len, buf, 2))
>> +
>>   #define SPINAND_PAGE_READ_FROM_CACHE_X4_OP(addr, ndummy, buf, len)	\
>>   	SPI_MEM_OP(SPI_MEM_OP_CMD(0x6b, 1),				\
>>   		   SPI_MEM_OP_ADDR(2, addr, 1),				\
>>   		   SPI_MEM_OP_DUMMY(ndummy, 1),				\
>>   		   SPI_MEM_OP_DATA_IN(len, buf, 4))
>>   
>> +#define SPINAND_PAGE_READ_FROM_CACHE_X4_OP_3A(addr, ndummy, buf, len)	\
>> +	SPI_MEM_OP(SPI_MEM_OP_CMD(0x6b, 1),				\
>> +		   SPI_MEM_OP_ADDR(3, addr, 1),				\
>> +		   SPI_MEM_OP_DUMMY(ndummy, 1),				\
>> +		   SPI_MEM_OP_DATA_IN(len, buf, 4))
>> +
>>   #define SPINAND_PAGE_READ_FROM_CACHE_DUALIO_OP(addr, ndummy, buf, len)	\
>>   	SPI_MEM_OP(SPI_MEM_OP_CMD(0xbb, 1),				\
>>   		   SPI_MEM_OP_ADDR(2, addr, 2),				\
>>   		   SPI_MEM_OP_DUMMY(ndummy, 2),				\
>>   		   SPI_MEM_OP_DATA_IN(len, buf, 2))
>>   
>> +#define SPINAND_PAGE_READ_FROM_CACHE_DUALIO_OP_3A(addr, ndummy, buf, len) \
>> +	SPI_MEM_OP(SPI_MEM_OP_CMD(0xbb, 1),				\
>> +		   SPI_MEM_OP_ADDR(3, addr, 2),				\
>> +		   SPI_MEM_OP_DUMMY(ndummy, 2),				\
>> +		   SPI_MEM_OP_DATA_IN(len, buf, 2))
>> +
>>   #define SPINAND_PAGE_READ_FROM_CACHE_QUADIO_OP(addr, ndummy, buf, len)	\
>>   	SPI_MEM_OP(SPI_MEM_OP_CMD(0xeb, 1),				\
>>   		   SPI_MEM_OP_ADDR(2, addr, 4),				\
>>   		   SPI_MEM_OP_DUMMY(ndummy, 4),				\
>>   		   SPI_MEM_OP_DATA_IN(len, buf, 4))
>>   
>> +#define SPINAND_PAGE_READ_FROM_CACHE_QUADIO_OP_3A(addr, ndummy, buf, len) \
>> +	SPI_MEM_OP(SPI_MEM_OP_CMD(0xeb, 1),				\
>> +		   SPI_MEM_OP_ADDR(3, addr, 4),				\
>> +		   SPI_MEM_OP_DUMMY(ndummy, 4),				\
>> +		   SPI_MEM_OP_DATA_IN(len, buf, 4))
>> +
>>   #define SPINAND_PROG_EXEC_OP(addr)					\
>>   	SPI_MEM_OP(SPI_MEM_OP_CMD(0x10, 1),				\
>>   		   SPI_MEM_OP_ADDR(3, addr, 1),				\
>>
> 
>