linux-kernel - Re: [PATCH] mfd: syscon: set regmap max_register in of_syscon

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Date:	Fri, 29 Jan 2016 11:15:14 +0000
From:	Lee Jones <lee.jones@...aro.org>
To:	Philipp Zabel <p.zabel@...gutronix.de>
Cc:	Arnd Bergmann <arnd@...db.de>, linux-kernel@...r.kernel.org,
	kernel@...gutronix.de
Subject: Re: [PATCH] mfd: syscon: set regmap max_register in
 of_syscon_register

On Fri, 29 Jan 2016, Philipp Zabel wrote:

> Determine the regmap max_register configuration from the io resource size
> and the reg-io-width device tree property.
> 
> Signed-off-by: Philipp Zabel <p.zabel@...gutronix.de>
> ---
>  drivers/mfd/syscon.c | 9 ++++++++-
>  1 file changed, 8 insertions(+), 1 deletion(-)

Applied, thanks.

> diff --git a/drivers/mfd/syscon.c b/drivers/mfd/syscon.c
> index b730071..2f2225e 100644
> --- a/drivers/mfd/syscon.c
> +++ b/drivers/mfd/syscon.c
> @@ -50,6 +50,7 @@ static struct syscon *of_syscon_register(struct device_node *np)
>  	u32 reg_io_width;
>  	int ret;
>  	struct regmap_config syscon_config = syscon_regmap_config;
> +	struct resource res;
>  
>  	if (!of_device_is_compatible(np, "syscon"))
>  		return ERR_PTR(-EINVAL);
> @@ -58,7 +59,12 @@ static struct syscon *of_syscon_register(struct device_node *np)
>  	if (!syscon)
>  		return ERR_PTR(-ENOMEM);
>  
> -	base = of_iomap(np, 0);
> +	if (of_address_to_resource(np, 0, &res)) {
> +		ret = -ENOMEM;
> +		goto err_map;
> +	}
> +
> +	base = ioremap(res.start, resource_size(&res));
>  	if (!base) {
>  		ret = -ENOMEM;
>  		goto err_map;
> @@ -81,6 +87,7 @@ static struct syscon *of_syscon_register(struct device_node *np)
>  
>  	syscon_config.reg_stride = reg_io_width;
>  	syscon_config.val_bits = reg_io_width * 8;
> +	syscon_config.max_register = resource_size(&res) - reg_io_width;
>  
>  	regmap = regmap_init_mmio(NULL, base, &syscon_config);
>  	if (IS_ERR(regmap)) {

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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