Re: [PATCH] drivers: mtd: devices: make m25p80 dt adapted.

[Huang Shijie <shijie8@gmail.com>]

On Fri, Aug 02, 2013 at 12:19:30PM +0530, Sourav Poddar wrote:
> This patch helps gettimg m25p80 probed through dt.
without this patch, we also can get the right SPI NOR type from the
dt entry.

Could you explain why we should get the m25p80 probed though the DT?
or give an example.


thanks
Huang Shijie
> To get the id of the exact flash type supported for dt case,
> data->type is getting parsed from dt entry.
> 
> Signed-off-by: Sourav Poddar <sourav.poddar@ti.com>
> ---
>  drivers/mtd/devices/m25p80.c |   22 +++++++++++++++++++++-
>  1 files changed, 21 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/mtd/devices/m25p80.c b/drivers/mtd/devices/m25p80.c
> index 33098bf..cbfb9b3 100644
> --- a/drivers/mtd/devices/m25p80.c
> +++ b/drivers/mtd/devices/m25p80.c
> @@ -855,6 +855,13 @@ static const struct spi_device_id m25p_ids[] = {
>  };
>  MODULE_DEVICE_TABLE(spi, m25p_ids);
>  
> +#ifdef CONFIG_OF
> +static const struct of_device_id m25p_dt_ids[] = {
> +	{ .compatible = "m25p80", },
> +	{ /* sentinel */ }
> +};
> +#endif
> +
>  static const struct spi_device_id *jedec_probe(struct spi_device *spi)
>  {
>  	int			tmp;
> @@ -909,6 +916,7 @@ static int m25p_probe(struct spi_device *spi)
>  	unsigned			i;
>  	struct mtd_part_parser_data	ppdata;
>  	struct device_node __maybe_unused *np = spi->dev.of_node;
> +	int len;
>  
>  #ifdef CONFIG_MTD_OF_PARTS
>  	if (!of_device_is_available(np))
> @@ -920,7 +928,18 @@ static int m25p_probe(struct spi_device *spi)
>  	 * a chip ID, try the JEDEC id commands; they'll work for most
>  	 * newer chips, even if we don't recognize the particular chip.
>  	 */
> -	data = spi->dev.platform_data;
> +	if (!np) {
> +		data = spi->dev.platform_data;
> +	} else {
> +		data = devm_kzalloc(&spi->dev, sizeof(*data), GFP_KERNEL);
> +		if (!data)
> +			return -ENOMEM;
> +
> +		data->type = (char *) of_get_property(np, "type", &len);
> +		if (!data->type || strlen(data->type) > len)
> +			return -ENODEV;
> +	}
> +
>  	if (data && data->type) {
>  		const struct spi_device_id *plat_id;
>  
> @@ -1098,6 +1117,7 @@ static struct spi_driver m25p80_driver = {
>  	.driver = {
>  		.name	= "m25p80",
>  		.owner	= THIS_MODULE,
> +		.of_match_table = of_match_ptr(m25p_dt_ids),
>  	},
>  	.id_table	= m25p_ids,
>  	.probe	= m25p_probe,
> -- 
> 1.7.1
> 
> 
> ______________________________________________________
> Linux MTD discussion mailing list
> http://lists.infradead.org/mailman/listinfo/linux-mtd/