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

Tudor.Ambarus
2019-08-25T13:02:53Z

On 08/25/2019 02:38 PM, Boris Brezillon wrote:
> External E-Mail
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>
> On Fri, 23 Aug 2019 15:53:33 +0000
> <Tudor.Ambarus@microchip.com> wrote:
>
>> From: Tudor Ambarus <tudor.ambarus@microchip.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(-)
>>
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