linux-kernel - Re: [PATCH v3 1/3] can: sja1000: of: add per-compatible init hook

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Message-ID: <5696332A.7000806@pengutronix.de>
Date:	Wed, 13 Jan 2016 12:21:14 +0100
From:	Marc Kleine-Budde <mkl@...gutronix.de>
To:	Damien Riegel <damien.riegel@...oirfairelinux.com>,
	linux-kernel@...r.kernel.org, linux-can@...r.kernel.org,
	netdev@...r.kernel.org
Cc:	Rob Herring <robh+dt@...nel.org>, Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Wolfgang Grandegger <wg@...ndegger.com>,
	kernel@...oirfairelinux.com
Subject: Re: [PATCH v3 1/3] can: sja1000: of: add per-compatible init hook

On 01/12/2016 11:31 PM, Damien Riegel wrote:
> This commit adds the capability to allocate and init private data
> embedded in the sja1000_priv structure on a per-compatible basis. The
> device node is passed as a parameter of the init callback to allow
> parsing of custom device tree properties.
> 
> Signed-off-by: Damien Riegel <damien.riegel@...oirfairelinux.com>
> ---
>  drivers/net/can/sja1000/sja1000_platform.c | 28 +++++++++++++++++++++-------
>  1 file changed, 21 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/net/can/sja1000/sja1000_platform.c b/drivers/net/can/sja1000/sja1000_platform.c
> index 0552ed4..ea4e18b 100644
> --- a/drivers/net/can/sja1000/sja1000_platform.c
> +++ b/drivers/net/can/sja1000/sja1000_platform.c
> @@ -40,6 +40,11 @@ MODULE_DESCRIPTION("Socket-CAN driver for SJA1000 on the platform bus");
>  MODULE_ALIAS("platform:" DRV_NAME);
>  MODULE_LICENSE("GPL v2");
>  
> +struct sja1000_of_data {
> +	size_t  priv_sz;
> +	int     (*init)(struct sja1000_priv *priv, struct device_node *of);
> +};
> +
>  static u8 sp_read_reg8(const struct sja1000_priv *priv, int reg)
>  {
>  	return ioread8(priv->reg_base + reg);
> @@ -154,6 +159,12 @@ static void sp_populate_of(struct sja1000_priv *priv, struct device_node *of)
>  		priv->cdr |= CDR_CBP; /* default */
>  }
>  
> +static const struct of_device_id sp_of_table[] = {
> +	{.compatible = "nxp,sja1000"},
> +	{},
> +};
> +MODULE_DEVICE_TABLE(of, sp_of_table);
> +
>  static int sp_probe(struct platform_device *pdev)
>  {
>  	int err, irq = 0;
> @@ -163,6 +174,9 @@ static int sp_probe(struct platform_device *pdev)
>  	struct resource *res_mem, *res_irq = NULL;
>  	struct sja1000_platform_data *pdata;
>  	struct device_node *of = pdev->dev.of_node;
> +	const struct of_device_id *id = of_match_node(sp_of_table, of);

Have you tested this with of == NULL? I think it should work as
__of_find_property returns NULL if np is NULL.

> +	const struct sja1000_of_data *of_data = id ? id->data : NULL; 
> +	size_t priv_sz = of_data ? of_data->priv_sz : 0; 

I've move the code a bit around to get rid of the ? operator. I'll send
a new series.

Marc

-- 
Pengutronix e.K.                  | Marc Kleine-Budde           |
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