Re: [PATCH v7 09/11] OMAP2+: GPIO: device registration

["Cousson, Benoit" <b-cousson@ti.com>]

On 11/23/2010 3:56 PM, Varadarajan, Charulatha wrote:
> Use omap_device_build() API to do platform_device_register of
> GPIO devices. For OMAP2+ chips, the device specific data defined
> in the centralized hwmod database will be used.
>
> gpio_init needs to be done before machine_init functions access
> gpio APIs. Hence gpio_init is made as a postcore_initcall.
>
> Signed-off-by: Charulatha V<charu@ti.com>
> Reviewed-by: Basak, Partha<p-basak2@ti.com>

Acked-by: Benoit Cousson <b-cousson@ti.com>

> ---
>   arch/arm/mach-omap2/gpio.c |  103 ++++++++++++++++++++++++++++++++++++++++++++
>   1 files changed, 103 insertions(+), 0 deletions(-)
>   create mode 100644 arch/arm/mach-omap2/gpio.c
>
> diff --git a/arch/arm/mach-omap2/gpio.c b/arch/arm/mach-omap2/gpio.c
> new file mode 100644
> index 0000000..e5c9b6a
> --- /dev/null
> +++ b/arch/arm/mach-omap2/gpio.c
> @@ -0,0 +1,104 @@
> +/*
> + * OMAP2+ specific gpio initialization
> + *
> + * Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com/
> + *
> + * Author:
> + *	Charulatha V<charu@ti.com>
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License as
> + * published by the Free Software Foundation version 2.
> + *
> + * This program is distributed "as is" WITHOUT ANY WARRANTY of any
> + * kind, whether express or implied; without even the implied warranty
> + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + */
> +
> +#include<linux/gpio.h>
> +#include<linux/err.h>
> +#include<linux/slab.h>
> +#include<linux/interrupt.h>
> +
> +#include<plat/omap_hwmod.h>
> +#include<plat/omap_device.h>
> +
> +static struct omap_device_pm_latency omap_gpio_latency[] = {
> +	[0] = {
> +		.deactivate_func = omap_device_idle_hwmods,
> +		.activate_func   = omap_device_enable_hwmods,
> +		.flags		 = OMAP_DEVICE_LATENCY_AUTO_ADJUST,
> +	},
> +};
> +
> +static int omap2_gpio_dev_init(struct omap_hwmod *oh, void *unused)
> +{
> +	struct omap_device *od;
> +	struct omap_gpio_platform_data *pdata;
> +	struct omap_gpio_dev_attr *dev_attr;
> +	char *name = "omap_gpio";
> +	int id;
> +
> +	/*
> +	 * extract the device id from name field available in the
> +	 * hwmod database and use the same for constructing ids for
> +	 * gpio devices.
> +	 * CAUTION: Make sure the name in the hwmod database does
> +	 * not change. If changed, make corresponding change here
> +	 * or make use of static variable mechanism to handle this.
> +	 */
> +	sscanf(oh->name, "gpio%d",&id);
> +
> +	pdata = kzalloc(sizeof(struct omap_gpio_platform_data), GFP_KERNEL);
> +	if (!pdata) {
> +		pr_err("gpio%d: Memory allocation failed\n", id);
> +		return -ENOMEM;
> +	}
> +
> +	dev_attr = (struct omap_gpio_dev_attr *)oh->dev_attr;
> +	pdata->bank_width = dev_attr->bank_width;
> +	pdata->dbck_flag = dev_attr->dbck_flag;
> +	pdata->virtual_irq_start = IH_GPIO_BASE + 32 * (id - 1);
> +
> +	switch (oh->class->rev) {
> +	case 0:
> +	case 1:
> +		pdata->bank_type = METHOD_GPIO_24XX;
> +		break;
> +	case 2:
> +		pdata->bank_type = METHOD_GPIO_44XX;
> +		break;
> +	default:
> +		WARN(1, "Invalid gpio bank_type\n");
> +		kfree(pdata);
> +		return -EINVAL;
> +	}
> +
> +	od = omap_device_build(name, id - 1, oh, pdata,
> +				sizeof(*pdata),	omap_gpio_latency,
> +				ARRAY_SIZE(omap_gpio_latency),
> +				false);
> +	kfree(pdata);
> +
> +	if (IS_ERR(od)) {
> +		WARN(1, "Cant build omap_device for %s:%s.\n",
> +					name, oh->name);
> +		return PTR_ERR(od);
> +	}
> +
> +	gpio_bank_count++;
> +	return 0;
> +}
> +
> +/*
> + * gpio_init needs to be done before
> + * machine_init functions access gpio APIs.
> + * Hence gpio_init is a postcore_initcall.
> + */
> +static int __init omap2_gpio_init(void)
> +{
> +	return omap_hwmod_for_each_by_class("gpio", omap2_gpio_dev_init,
> +						NULL);
> +}
> +postcore_initcall(omap2_gpio_init);