linux-kernel - Re: [PATCH 0/5] mtd: spi-nor: move manuf out of the core

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Date:   Sun, 25 Aug 2019 13:02:38 +0000
From:   <Tudor.Ambarus@...rochip.com>
To:     <boris.brezillon@...labora.com>
CC:     <marek.vasut@...il.com>, <vigneshr@...com>,
        <miquel.raynal@...tlin.com>, <richard@....at>,
        <linux-mtd@...ts.infradead.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/5] mtd: spi-nor: move manuf out of the core - batch 0



On 08/25/2019 02:38 PM, Boris Brezillon wrote:
> External E-Mail
> 
> 
> On Fri, 23 Aug 2019 15:53:33 +0000
> <Tudor.Ambarus@...rochip.com> wrote:
> 
>> From: Tudor Ambarus <tudor.ambarus@...rochip.com>
>>
>> This series is a prerequisite for the effort of moving the
>> manufacturer specific code out of the SPI NOR core.
>>
>> The scope is to move all [FLASH-SPECIFIC] parameters and settings
>> from 'struct spi_nor' to 'struct spi_nor_flash_parameter'. We will
>> have a clear separation between the SPI NOR layer and the flash
>> parameters and settings.
>>
>> 'struct spi_nor_flash_parameter' describes the hardware capabilities
>> and associated settings of the SPI NOR flash memory. It includes
>> legacy flash parameters and settings that can be overwritten by the
>> spi_nor_fixups hooks, or dynamically when parsing the JESD216
>> Serial Flash Discoverable Parameters (SFDP) tables. All SFDP params
>> and settings will fit inside 'struct spi_nor_flash_parameter'.
> 
> While we're at moving things around, I think it'd make sense to move
> all '[DRIVER SPECIFIC]' fields (which are actually SPI NOR controller
> driver specific fields) to a separate struct:
> 
> struct spi_nor_controller_ops {
> 	int (*prepare)(struct spi_nor *nor, enum spi_nor_ops ops);
> 	void (*unprepare)(struct spi_nor *nor, enum spi_nor_ops ops);
> 	int (*read_reg)(struct spi_nor *nor, u8 opcode, u8 *buf, int len);
> 	int (*write_reg)(struct spi_nor *nor, u8 opcode, u8 *buf, int len);
> 	ssize_t (*read)(struct spi_nor *nor, loff_t from,
> 			size_t len, u_char *read_buf);
> 	ssize_t (*write)(struct spi_nor *nor, loff_t to,
> 			size_t len, const u_char *write_buf);
> 	int (*erase)(struct spi_nor *nor, loff_t offs);
> };
> 
> struct spi_nor {
> ...
> 	const struct spi_nor_controller_ops *controller_ops;
> ...
> };

Yep, this is a good idea. I'll make a patch and add your Suggested-by tag.

Thanks!

> 
>>
>> Tested uniform and non-uniform erase on sst26vf064b flash using the
>> atmel-quadspi driver.
>>
>> In order to test this, you'll have to merge v5.3-rc5 in spi-nor/next.
>> This patch depends on
>> 'commit 834de5c1aa76 ("mtd: spi-nor: Fix the disabling of write protection at init")
>>
>> Tudor Ambarus (5):
>>   mtd: spi-nor: Regroup flash parameter and settings
>>   mtd: spi-nor: Use nor->params
>>   mtd: spi-nor: Drop quad_enable() from 'struct spi-nor'
>>   mtd: spi-nor: Move clear_sr_bp() to 'struct spi_nor_flash_parameter'
>>   mtd: spi-nor: Move erase_map to 'struct spi_nor_flash_parameter'
>>
>>  drivers/mtd/spi-nor/spi-nor.c | 236 ++++++++++++++++-----------------------
>>  include/linux/mtd/spi-nor.h   | 254 ++++++++++++++++++++++++++++--------------
>>  2 files changed, 269 insertions(+), 221 deletions(-)
>>
> 
> 
>