linux-kernel - Re: [PATCH v3 04/15] mtd: rawnand: sunxi: introduce reg_user_data in sunxi_nfc

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Message-ID: <f076f6a6-372a-41ff-a78a-48d1af4ec33d@bootlin.com>
Date: Fri, 24 Oct 2025 09:20:58 +0200
From: Richard GENOUD <richard.genoud@...tlin.com>
To: Miquel Raynal <miquel.raynal@...tlin.com>
Cc: Richard Weinberger <richard@....at>, Vignesh Raghavendra
 <vigneshr@...com>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
 Jernej Skrabec <jernej.skrabec@...il.com>,
 Samuel Holland <samuel@...lland.org>,
 Uwe Kleine-König <u.kleine-koenig@...libre.com>,
 Wentao Liang <vulab@...as.ac.cn>, Johan Hovold <johan@...nel.org>,
 Maxime Ripard <mripard@...nel.org>,
 Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
 linux-mtd@...ts.infradead.org, devicetree@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-sunxi@...ts.linux.dev,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 04/15] mtd: rawnand: sunxi: introduce reg_user_data in
 sunxi_nfc_caps

Hi,
Le 22/10/2025 à 10:54, Miquel Raynal a écrit :
> Hi Richard,
> 
> On 20/10/2025 at 12:13:00 +02, Richard Genoud <richard.genoud@...tlin.com> wrote:
> 
>> The H6/H616 USER_DATA register is not at the same offset as the
>> A10/A23 one, so move its offset into sunxi_nfc_caps
>>
>> No functional change.
>>
>> Signed-off-by: Richard Genoud <richard.genoud@...tlin.com>
>> ---
>>   drivers/mtd/nand/raw/sunxi_nand.c | 13 +++++++++----
>>   1 file changed, 9 insertions(+), 4 deletions(-)
>>
>> diff --git a/drivers/mtd/nand/raw/sunxi_nand.c b/drivers/mtd/nand/raw/sunxi_nand.c
>> index 0285e4d0ca7f..8f5d8df19e33 100644
>> --- a/drivers/mtd/nand/raw/sunxi_nand.c
>> +++ b/drivers/mtd/nand/raw/sunxi_nand.c
>> @@ -48,7 +48,8 @@
>>   #define NFC_REG_DEBUG		0x003C
>>   #define NFC_REG_A10_ECC_ERR_CNT	0x0040
>>   #define NFC_REG_ECC_ERR_CNT(nfc, x)	((nfc->caps->reg_ecc_err_cnt + (x)) & ~0x3)
>> -#define NFC_REG_USER_DATA(x)	(0x0050 + ((x) * 4))
>> +#define NFC_REG_A10_USER_DATA	0x0050
>> +#define NFC_REG_USER_DATA(nfc, x)	(nfc->caps->reg_user_data + ((x) * 4))
>>   #define NFC_REG_SPARE_AREA	0x00A0
>>   #define NFC_REG_PAT_ID		0x00A4
>>   #define NFC_REG_MDMA_ADDR	0x00C0
>> @@ -214,6 +215,7 @@ static inline struct sunxi_nand_chip *to_sunxi_nand(struct nand_chip *nand)
>>    *			through MBUS on A23/A33 needs extra configuration.
>>    * @reg_io_data:	I/O data register
>>    * @reg_ecc_err_cnt:	ECC error counter register
>> + * @reg_user_data:	User data register
>>    * @dma_maxburst:	DMA maxburst
>>    * @ecc_strengths:	Available ECC strengths array
>>    * @nstrengths:		Size of @ecc_strengths
>> @@ -222,6 +224,7 @@ struct sunxi_nfc_caps {
>>   	bool has_mdma;
>>   	unsigned int reg_io_data;
>>   	unsigned int reg_ecc_err_cnt;
>> +	unsigned int reg_user_data;
>>   	unsigned int dma_maxburst;
>>   	const u8 *ecc_strengths;
>>   	unsigned int nstrengths;
>> @@ -723,8 +726,8 @@ static void sunxi_nfc_hw_ecc_get_prot_oob_bytes(struct nand_chip *nand, u8 *oob,
>>   {
>>   	struct sunxi_nfc *nfc = to_sunxi_nfc(nand->controller);
>>   
>> -	sunxi_nfc_user_data_to_buf(readl(nfc->regs + NFC_REG_USER_DATA(step)),
>> -				   oob);
>> +	sunxi_nfc_user_data_to_buf(readl(nfc->regs +
>> +					 NFC_REG_USER_DATA(nfc, step)),
>> oob);
> 
> Minor nit, column limit is 100 now, so typically for this kind of
> situation everything would fit on a single line.
Indeed, the 80 column limit has been loosened (but braille displays are 
still 80 cells max AFAIK).
Anyway, you're right, the 80-rule could be bent here for readability.

> 
> Don't respin just for that if there is nothing else later, but if a v4
> is needed you can change it.
> 
> Looks neat otherwise so far.
> 
> Thanks,
> Miquèl

Thanks!


-- 
Richard Genoud, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com