linux-kernel - Re: [PATCH RESEND v2 2/4] mfd: intel_soc

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Date:	Fri, 23 May 2014 18:53:12 +0100
From:	Mark Brown <broonie@...nel.org>
To:	"Zhu, Lejun" <lejun.zhu@...ux.intel.com>
Cc:	lee.jones@...aro.org, sameo@...ux.intel.com,
	linux-kernel@...r.kernel.org, jacob.jun.pan@...ux.intel.com,
	bin.yang@...el.com
Subject: Re: [PATCH RESEND v2 2/4] mfd: intel_soc_pmic: I2C interface

On Fri, May 23, 2014 at 08:40:27AM +0800, Zhu, Lejun wrote:

> +static int pmic_i2c_lookup_gpio(struct device *dev, int acpi_index)
> +{
> +	struct gpio_desc *desc;
> +	int gpio;
> +
> +	desc = gpiod_get_index(dev, KBUILD_MODNAME, acpi_index);
> +	if (IS_ERR(desc))
> +		return PTR_ERR(desc);
> +
> +	gpio = desc_to_gpio(desc);
> +
> +	gpiod_put(desc);
> +
> +	return gpio;
> +}

Why not just have the driver work with the gpiod API, is there any real
need to convert to a GPIO number?

> +static const struct i2c_device_id pmic_i2c_id[] = {
> +	{ "crystal_cove", (kernel_ulong_t)&crystal_cove_pmic},
> +	{ "INT33FD", (kernel_ulong_t)&crystal_cove_pmic},
> +	{ "INT33FD:00", (kernel_ulong_t)&crystal_cove_pmic},
> +	{ }
> +};
> +MODULE_DEVICE_TABLE(i2c, pmic_i2c_id);

The INT33FD ones here look like they should only be in the ACPI table.

> +static int __init pmic_i2c_init(void)
> +{
> +	int ret;
> +
> +	ret = i2c_add_driver(&pmic_i2c_driver);
> +	if (ret != 0)
> +		pr_err("Failed to register pmic I2C driver: %d\n", ret);
> +
> +	return ret;
> +}
> +subsys_initcall(pmic_i2c_init);

module_i2c_driver() - you shouldn't need subsys_initcall().

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