Subject: Re: [RFC] ARM: Add SMSC911X support to Overo platform

From: Kevin Hilman <[email-masked]>
Date: Fri, 30 Jan 2009 14:18:10 -0800

Steve Sakoman <[email-masked]> writes:

> Gumstix will soon be shipping a variant of their Summit board that
> includes an SMSC9221 ethernet interface.  This patch is intended to
> provide support via the smsc911x driver when enabled in defconfig.
> The final submission of course will also include an updated defconfig.
>
> Signed-off-by: Steve Sakoman <[email-masked]>
> ---
> diff --git a/arch/arm/mach-omap2/board-overo.c
> b/arch/arm/mach-omap2/board-overo.c
> index 9995ac2..97d95a4 100644
> --- a/arch/arm/mach-omap2/board-overo.c
> +++ b/arch/arm/mach-omap2/board-overo.c
> @@ -55,6 +55,63 @@
>  #define GPMC_CS0_BASE  0x60
>  #define GPMC_CS_SIZE   0x30
>
> +#if defined(CONFIG_SMSC911X) || defined(CONFIG_SMSC911X_MODULE)
> +
> +#include <linux/smsc911x.h>
> +
> +static struct resource overo_smsc911x_resources[] = {
> +	{
> +		.name	= "smsc911x-memory",
> +		.flags	= IORESOURCE_MEM,
> +	},
> +	{
> +		.flags	= IORESOURCE_IRQ | IORESOURCE_IRQ_LOWLEVEL,
> +	},
> +};
> +
> +static struct smsc911x_platform_config overo_smsc911x_config = {
> +	.irq_polarity	= SMSC911X_IRQ_POLARITY_ACTIVE_LOW,
> +	.irq_type	= SMSC911X_IRQ_TYPE_OPEN_DRAIN,
> +	.flags		= SMSC911X_USE_32BIT ,
> +	.phy_interface	= PHY_INTERFACE_MODE_MII,
> +};
> +
> +static struct platform_device overo_smsc911x_device = {
> +	.name		= "smsc911x",
> +	.id		= -1,
> +	.num_resources	= ARRAY_SIZE(overo_smsc911x_resources),
> +	.resource	= &overo_smsc911x_resources,
> +	.dev		= {
> +		.platform_data = &overo_smsc911x_config,
> +	},
> +};
> +
> +static inline void __init overo_init_smsc911x(void)
> +{
> +	unsigned long cs_mem_base;
> +
> +	if (gpmc_cs_request(OVERO_SMSC911X_CS, SZ_16M, &cs_mem_base) < 0) {
> +		printk(KERN_ERR "Failed request for GPMC mem for smsc911x\n");
> +		return;
> +	}
> +
> +	overo_smsc911x_resources[0].start = cs_mem_base + 0x0;
> +	overo_smsc911x_resources[0].end   = cs_mem_base + 0xff;
> +
> +	if ((gpio_request(OVERO_SMSC911X_GPIO, "SMSC911X IRQ") == 0) &&
> +	    (gpio_direction_input(OVERO_SMSC911X_GPIO) == 0)) {
> +		gpio_export(OVERO_SMSC911X_GPIO, 0);
> +	} else {
> +		printk(KERN_ERR "could not obtain gpio for SMSC911X IRQ\n");
> +		return;
> +	}
> +
> +	overo_smsc911x_resources[1].start = OMAP_GPIO_IRQ(OVERO_SMSC911X_GPIO),
> +	overo_smsc911x_resources[1].end	  = OMAP_GPIO_IRQ(OVERO_SMSC911X_GPIO),

I would put the 'platform_device_register(&overo_smsc911x_device)' here.

> +}
> +

Then here, add:

#else
static inline void __init overo_init_smsc911x(void) { return; }

This allows you to drop the #ifdefs below and have it look a little
cleaner.

Other than that, looks OK to me.

Kevin

> +#endif
> +
>  static struct mtd_partition overo_nand_partitions[] = {
>  	{
>  		.name           = "xloader",
> @@ -187,6 +244,9 @@ static void __init overo_init_irq(void)
>  	omap2_init_common_hw(mt46h32m32lf6_sdrc_params);
>  	omap_init_irq();
>  	omap_gpio_init();
> +#if defined(CONFIG_SMSC911X) || defined(CONFIG_SMSC911X_MODULE)
> +	overo_init_smsc911x();
> +#endif
>  }
>
>  static struct platform_device overo_lcd_device = {
> @@ -204,6 +264,9 @@ static struct omap_board_config_kernel
> overo_config[] __initdata = {
>  };
>
>  static struct platform_device *overo_devices[] __initdata = {
> +#if defined(CONFIG_SMSC911X) || defined(CONFIG_SMSC911X_MODULE)
> +	&overo_smsc911x_device,
> +#endif
>  	&overo_lcd_device,
>  };
>
> diff --git a/arch/arm/plat-omap/include/mach/board-overo.h
> b/arch/arm/plat-omap/include/mach/board-overo.h
> index 7ecae66..8635171 100644
> --- a/arch/arm/plat-omap/include/mach/board-overo.h
> +++ b/arch/arm/plat-omap/include/mach/board-overo.h
> @@ -22,5 +22,8 @@
>  #define OVERO_GPIO_USBH_CPEN	168
>  #define OVERO_GPIO_USBH_NRESET	183
>
> +#define OVERO_SMSC911X_CS	5
> +#define OVERO_SMSC911X_GPIO	176
> +
>  #endif /* ____ASM_ARCH_OVERO_H */
> --
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