netdev - Re: [PATCH v3 5/5] can: sja1000: of: add reg-io-width property for 8, 16 and 32-bit register access

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Message-ID: <52EBAE41.8060403@cogentembedded.com>
Date:	Fri, 31 Jan 2014 18:08:01 +0400
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	Florian Vaussard <florian.vaussard@...l.ch>,
	Wolfgang Grandegger <wg@...ndegger.com>,
	Marc Kleine-Budde <mkl@...gutronix.de>
CC:	Andreas Larsson <andreas@...sler.com>, linux-can@...r.kernel.org,
	netdev@...r.kernel.org, sparclinux@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 5/5] can: sja1000: of: add reg-io-width property for
 8, 16 and 32-bit register access

Hello.

On 31-01-2014 17:34, 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 | 16 ++++++++++++++--
>   1 file changed, 14 insertions(+), 2 deletions(-)

> diff --git a/drivers/net/can/sja1000/sja1000_platform.c b/drivers/net/can/sja1000/sja1000_platform.c
> index 50dece8..25122bf 100644
> --- a/drivers/net/can/sja1000/sja1000_platform.c
> +++ b/drivers/net/can/sja1000/sja1000_platform.c
> @@ -102,8 +102,20 @@ 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;
> +	err = of_property_read_u32(of, "reg-io-width", &prop);
> +	if (err)
> +		prop = 1;
> +
> +	if (prop == 4) {

    This is asking to be a *switch* statement instead.

> +		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;
> +	}

WBR, Sergei

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