linux-kernel - Re: [PATCH 19 4/5] Convert PowerPC MPC i2c to of_platform_driver from platform

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Date:	Sat, 12 Jan 2008 15:07:14 +1100
From:	Stephen Rothwell <sfr@...b.auug.org.au>
To:	Jon Smirl <jonsmirl@...il.com>
Cc:	i2c@...sensors.org, linuxppc-dev@...abs.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 19 4/5] Convert PowerPC MPC i2c to of_platform_driver
 from platform_driver

Hi Jon,

On Fri, 11 Jan 2008 21:47:46 -0500 Jon Smirl <jonsmirl@...il.com> wrote:
>
> +++ b/drivers/i2c/busses/i2c-mpc.c

> +static void of_register_i2c_devices(struct i2c_adapter *adap, struct device_node *adap_node)
> +{
> +	struct device_node *node = NULL;
> +
> +	while ((node = of_get_next_child(adap_node, node))) {

We have for_each_child_of_node(adap_node, node) now for this (and it
means you don't need to initialize the "node" above).

> +		struct i2c_board_info info;
> +		const u32 *addr;
> +		const char *compatible;
> +		int len;
> +
> +		addr = of_get_property(node, "reg", &len);
> +		if (!addr || len < sizeof(int) || *addr > (1 << 10) - 1) {
> +			printk(KERN_ERR "i2c-mpc.c: invalid entry, missing reg attribute\n");
> +			continue;
> +		}
> +
> +		info.irq = irq_of_parse_and_map(node, 0);
> +		if (info.irq == NO_IRQ)
> +			info.irq = -1;
> +
> +		compatible = of_get_property(node, "compatible", &len);
> +		if (!compatible) {
> +			printk(KERN_ERR "i2c-mpc.c: invalid entry, missing compatible attribute\n");
> +			continue;

You may need to clean up from the irq_of_pase_and_map().

> +		}
> +		
> +		/* need full alias i2c:NOF,vendor,device */
> +		strcpy(info.type, I2C_OF_MODULE_PREFIX);
> +		strncat(info.type, compatible, sizeof(info.type));
> +		request_module(info.type);
> +		
> +		/* need module alias OF,vendor,device */
> +		strcpy(info.type, OF_I2C_PREFIX);
> +		strncat(info.type, compatible, sizeof(info.type));
> +		
> +		info.driver_name[0] = '\0';
> +		info.platform_data = NULL;
> +		info.addr = *addr;
> +
> +		if (!i2c_new_device(adap, &info)) {
> +			printk(KERN_ERR "i2c-mpc.c: Failed to load driver for %s\n", info.type);
> +			continue;

And again.

> +		}
> +	}
> +}
> +
> +static int mpc_i2c_probe(struct of_device *op, const struct of_device_id *match)
> +{

> +	dev_set_drvdata(&op->dev, i2c);
> +
> +	i2c->adap = mpc_ops;
> +	i2c_set_adapdata(&i2c->adap, i2c);
> +	i2c->adap.dev.parent = &op->dev;
> +
> +	result = i2c_add_adapter(&i2c->adap);
> +	if (result < 0) {
> +		printk(KERN_ERR "i2c-mpc - failed to add adapter\n");
> +		goto fail_add;
> +	}
> +
> +	of_register_i2c_devices(&i2c->adap, op->node);
> +
> +	return result;
> +
> +fail_add:

	dev_set_dvdata(&op->dev, NULL);

> +	free_irq(i2c->irq, i2c);
> +fail_request:
> +	irq_dispose_mapping(i2c->irq);
> +fail_irq:
> +	iounmap(i2c->base);
> +fail_map:
> +	kfree(i2c);
> +	return result;
> +};

> +static struct of_device_id mpc_i2c_of_match[] = {

const, please.

-- 
Cheers,
Stephen Rothwell                    sfr@...b.auug.org.au
http://www.canb.auug.org.au/~sfr/

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