[U-Boot] [RFC PATCH v2 09/11] sf_mtd: Simply mtd operations

[Boris Brezillon <boris.brezillon@bootlin.com>]

On Tue, 4 Dec 2018 17:56:57 +0530
Vignesh R <vigneshr@ti.com> wrote:

> Now that there is new SPI NOR framework, simplify mtd device
> registration and read/write/erase operations.
> 
> Signed-off-by: Vignesh R <vigneshr@ti.com>
> ---
>  drivers/mtd/spi/sf_internal.h |  2 +-
>  drivers/mtd/spi/sf_mtd.c      | 39 ++++++++++++-----------------------
>  drivers/mtd/spi/sf_probe.c    |  2 +-
>  3 files changed, 15 insertions(+), 28 deletions(-)
> 
> diff --git a/drivers/mtd/spi/sf_internal.h b/drivers/mtd/spi/sf_internal.h
> index 7e7d400cdbdf..8b445bb0b506 100644
> --- a/drivers/mtd/spi/sf_internal.h
> +++ b/drivers/mtd/spi/sf_internal.h
> @@ -99,6 +99,6 @@ int spi_flash_cmd_get_sw_write_prot(struct spi_flash *flash);
>  
>  #ifdef CONFIG_SPI_FLASH_MTD
>  int spi_flash_mtd_register(struct spi_flash *flash);
> -void spi_flash_mtd_unregister(void);
> +void spi_flash_mtd_unregister(struct spi_flash *flash);
>  #endif
>  #endif /* _SF_INTERNAL_H_ */
> diff --git a/drivers/mtd/spi/sf_mtd.c b/drivers/mtd/spi/sf_mtd.c
> index 58d7e4439903..9c07ba3cadf7 100644
> --- a/drivers/mtd/spi/sf_mtd.c
> +++ b/drivers/mtd/spi/sf_mtd.c
> @@ -9,17 +9,15 @@
>  #include <linux/mtd/mtd.h>
>  #include <spi_flash.h>
>  
> -static struct mtd_info sf_mtd_info;
>  static char sf_mtd_name[8];
>  
>  static int spi_flash_mtd_erase(struct mtd_info *mtd, struct erase_info *instr)
>  {
> -	struct spi_flash *flash = mtd->priv;
>  	int err;
>  
>  	instr->state = MTD_ERASING;
>  
> -	err = spi_flash_erase(flash, instr->addr, instr->len);
> +	err = mtd->_erase(mtd, instr);

Please don't dereference mtd hooks directly. I'm pretty sure the
mtd_erase() overhead is negligible, and if it's not, you can
implement dummy wrappers for the SPL case to reduce it to zero.