linux-kernel - Re: [PATCH v4 2/3] mtd: spi-nor: Move m25p80 code in spi-nor.c

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Message-ID: <cdc6268d-16c7-82ad-53e0-9ec9352d0400@ti.com>
Date:   Mon, 5 Aug 2019 18:01:42 +0530
From:   Vignesh Raghavendra <vigneshr@...com>
To:     <Tudor.Ambarus@...rochip.com>, <miquel.raynal@...tlin.com>,
        <richard@....at>
CC:     <marek.vasut@...il.com>, <linux-mtd@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <tmaimon77@...il.com>,
        <bbrezillon@...nel.org>
Subject: Re: [PATCH v4 2/3] mtd: spi-nor: Move m25p80 code in spi-nor.c



On 05/08/19 5:21 PM, Tudor.Ambarus@...rochip.com wrote:
> 
> 
> On 08/05/2019 02:10 PM, Vignesh Raghavendra wrote:
>> External E-Mail
>>
>>
>>
>> On 05/08/19 3:55 PM, Tudor.Ambarus@...rochip.com wrote:
>>>
>>>
>>> On 08/01/2019 07:22 PM, Vignesh Raghavendra wrote:
>>>
>>>> diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
>>>> index e02376e1127b..866962c715b4 100644
>>>> --- a/drivers/mtd/spi-nor/spi-nor.c
>>>> +++ b/drivers/mtd/spi-nor/spi-nor.c
>>>> @@ -19,6 +19,7 @@
>>>
> 
>>>>  
>>>> @@ -688,6 +1003,16 @@ static int spi_nor_erase_sector(struct spi_nor *nor, u32 addr)
>>>>  	if (nor->erase)
>>>>  		return nor->erase(nor, addr);
>>>>  
>>>> +	if (nor->spimem) {
>>>> +		struct spi_mem_op op =
>>>> +			SPI_MEM_OP(SPI_MEM_OP_CMD(nor->erase_opcode, 1),
>>>> +				   SPI_MEM_OP_ADDR(nor->addr_width, addr, 1),
>>>> +				   SPI_MEM_OP_NO_DUMMY,
>>>> +				   SPI_MEM_OP_NO_DATA);
>>>> +
>>>> +		return spi_mem_exec_op(nor->spimem, &op);
>>>> +	}
>>>> +
>>>
>>> this should be done below in the function, after masking the address.
>>
>> Nope. It would have been true if addr been sent as part of op.data.buf.out. 
>> But since addr is being send as part of op.addr.val, spi-mem.c takes care of this for spi_transfer(s)
>>
> 
> Is this valid also for the controllers that implement the ctlr->mem_ops?

Nope, address conversion logic is not required if ctlr->mem_ops is
implemented. spi-mem drivers should be able to handle address field as
is and there is no need to be converted to SPI bus order.

Regards
Vignesh

> 
>>>
>>> You add a double space after return in:
>>>> +	return  nor->read_reg(nor, SPINOR_OP_RDSR2, sr2, 1);
>>>
>>
>> Ah, Will fix
>>
>>> There are some checkpatch warnings that we can fix now.
>>>
>>
>> I did see warnings like:
>>>
>>> WARNING: line over 80 characters
>>> #1023: FILE: drivers/mtd/spi-nor/spi-nor.c:2554:
>>> +				   SPI_MEM_OP_DATA_IN(SPI_NOR_MAX_ID_LEN, id, 1));
>>
>> I think its okay to overshoot 80 char limit for better readability. 
> 
> ok
> 
>> Let me know if you think otherwise> 
>>> ERROR: space required after that ',' (ctx:VxV)
>>> #1270: FILE: drivers/mtd/spi-nor/spi-nor.c:4846:
>>> +	{"mx25l25635e"},{"mx66l51235l"},
>>> 	               ^
>>
>> This and similar warnings can be fixed, but will throw off alignment wrt previous lines.
>> Therefore I let them be as is.
> 
> ok
> 
> Cheers,ta
> 

-- 
Regards
Vignesh