linux-kernel - Re: [PATCH v2 6/6] can: sja1000: of: add reg-io-width property for 8, 16 and 32-bit register access

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Date:	Fri, 31 Jan 2014 13:28:42 +0100
From:	Marc Kleine-Budde <mkl@...gutronix.de>
To:	Florian Vaussard <florian.vaussard@...l.ch>,
	Wolfgang Grandegger <wg@...ndegger.com>
CC:	linux-can@...r.kernel.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 6/6] can: sja1000: of: add reg-io-width property for
 8, 16 and 32-bit register access

On 01/31/2014 11:35 AM, Florian Vaussard wrote:
> Add the 'reg-io-width' property for 8, 16 and 32-bit access, like
> what is currently done with IORESOURCE_MEM_{8,16,32}BIT for non-OF
> boot.
> 
> Signed-off-by: Florian Vaussard <florian.vaussard@...l.ch>
> ---
>  drivers/net/can/sja1000/sja1000_platform.c | 13 +++++++++++--
>  1 file changed, 11 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/can/sja1000/sja1000_platform.c b/drivers/net/can/sja1000/sja1000_platform.c
> index 96a92a1..62ebc3d 100644
> --- a/drivers/net/can/sja1000/sja1000_platform.c
> +++ b/drivers/net/can/sja1000/sja1000_platform.c
> @@ -103,8 +103,17 @@ static void sp_populate_of(struct sja1000_priv *priv, struct device_node *of)
>  	int err;
>  	u32 prop;
>  
> -	priv->read_reg = sp_read_reg8;
> -	priv->write_reg = sp_write_reg8;
> +	of_property_read_u32(of, "reg-io-width", &prop);

The new property might not be available in the DT, please check the
return value of of_property_read_u32(). Use 8 bit wide as default.

> +	if (prop == 4) {
> +		priv->read_reg = sp_read_reg32;
> +		priv->write_reg = sp_write_reg32;
> +	} else if (prop == 2) {
> +		priv->read_reg = sp_read_reg16;
> +		priv->write_reg = sp_write_reg16;
> +	} else {
> +		priv->read_reg = sp_read_reg8;
> +		priv->write_reg = sp_write_reg8;
> +	}
>  
>  	err = of_property_read_u32(of, "nxp,external-clock-frequency", &prop);
>  	if (!err)
> 

Marc

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