linux-kernel - Re: [PATCH 14/15] mtd: st_spi_fsm: Provide mask to obtain correct boot device pins

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Date:	Wed, 9 Apr 2014 00:11:05 -0700
From:	Brian Norris <computersforpeace@...il.com>
To:	Lee Jones <lee.jones@...aro.org>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	kernel@...inux.com, linux-mtd@...ts.infradead.org,
	angus.clark@...com, Christophe Kerello <christophe.kerello@...com>,
	devicetree@...r.kernel.org
Subject: Re: [PATCH 14/15] mtd: st_spi_fsm: Provide mask to obtain correct
 boot device pins

+ DT list

On Wed, Mar 26, 2014 at 04:39:28PM +0000, Lee Jones wrote:
> From: Christophe Kerello <christophe.kerello@...com>
> 
> This patch adds a mask to be able to get the right boot device selection.
> 
> For example:
>     for STiH415, value = SYSTEM_STATUS398[4:0]
>     for STiH416, value = SYSTEM_STATUS2598[4:0]
>     for STiH407, value = SYSTEM_STATUS5561[6:2]
> 
> Signed-off-by: Christophe Kerello <christophe.kerello@...com>
> Signed-off-by: Lee Jones <lee.jones@...aro.org>
> ---
>  drivers/mtd/devices/st_spi_fsm.c | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/drivers/mtd/devices/st_spi_fsm.c b/drivers/mtd/devices/st_spi_fsm.c
> index 9e00173..3ab27c8 100644
> --- a/drivers/mtd/devices/st_spi_fsm.c
> +++ b/drivers/mtd/devices/st_spi_fsm.c
> @@ -2159,6 +2159,7 @@ static void stfsm_fetch_platform_configs(struct platform_device *pdev)
>  	struct regmap *regmap;
>  	uint32_t boot_device_reg;
>  	uint32_t boot_device_spi;
> +	uint32_t boot_device_msk;
>  	uint32_t boot_device;     /* Value we read from *boot_device_reg */
>  	int ret;
>  
> @@ -2183,10 +2184,17 @@ static void stfsm_fetch_platform_configs(struct platform_device *pdev)
>  	if (ret)
>  		goto boot_device_fail;
>  
> +	/* Mask to apply on boot_device_reg */
> +	ret = of_property_read_u32(np, "st,boot-device-msk", &boot_device_msk);

You need to document this binding in Documentation/devicetree/bindings/,
and CC the devicetree list.

> +	if (ret)
> +		goto boot_device_fail;
> +
>  	ret = regmap_read(regmap, boot_device_reg, &boot_device);
>  	if (ret)
>  		goto boot_device_fail;
>  
> +	boot_device &= boot_device_msk;
> +
>  	if (boot_device != boot_device_spi)
>  		fsm->booted_from_spi = false;
>  

Brian
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