linux-kernel - Re: [PATCH 1/7] spi: add slave device size in spi

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Message-ID: <20180831135807.22255bce@karo-electronics.de>
Date:   Fri, 31 Aug 2018 13:58:07 +0200
From:   Lothar Waßmann <LW@...O-electronics.de>
To:     Yogesh Gaur <yogeshnarayan.gaur@....com>
Cc:     linux-mtd@...ts.infradead.org, boris.brezillon@...tlin.com,
        marek.vasut@...il.com, linux-spi@...r.kernel.org,
        devicetree@...r.kernel.org, mark.rutland@....com, robh@...nel.org,
        linux-kernel@...r.kernel.org, frieder.schrempf@...eet.de,
        computersforpeace@...il.com, shawnguo@...nel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 1/7] spi: add slave device size in spi_device struct

Hi,

On Fri, 31 Aug 2018 15:59:58 +0530 Yogesh Gaur wrote:
> Add 'size' data variable in spi_device struct.
> This is to save the size of the connected slave device.
> 
> After slave device scan, spi_nor_scan, size being assigned to this
> from MTD layer.
> 
> SFDP read is being requested before completion of spi_nor_scan()
> routine, thus populate device size before making read request
> to the SPI controller.
> 
> Signed-off-by: Yogesh Gaur <yogeshnarayan.gaur@....com>
> ---
>  drivers/mtd/devices/m25p80.c  | 6 ++++++
>  drivers/mtd/spi-nor/spi-nor.c | 2 ++
>  include/linux/spi/spi.h       | 2 ++
>  3 files changed, 10 insertions(+)
> 
> diff --git a/drivers/mtd/devices/m25p80.c b/drivers/mtd/devices/m25p80.c
> index fe260cc..6c7ad86 100644
> --- a/drivers/mtd/devices/m25p80.c
> +++ b/drivers/mtd/devices/m25p80.c
> @@ -124,6 +124,10 @@ static ssize_t m25p80_read(struct spi_nor *nor, loff_t from, size_t len,
>  	/* convert the dummy cycles to the number of bytes */
>  	op.dummy.nbytes = (nor->read_dummy * op.dummy.buswidth) / 8;
>  
> +	/* for case of SFDP header read commands, populate spi device size */
> +	if (flash->spimem->spi->size == 0)
> +		flash->spimem->spi->size = nor->mtd.size;
> +
If the 'size' is an spimem specific variable it should be added to the
spi_mem struct rather than the spi_device struct.


Lothar Waßmann