Re: MCP2515 DTS support

[Marc Kleine-Budde <mkl@pengutronix.de>]

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On 02/26/2014 06:36 PM, Lucas Zampar Bernardi wrote:
> You are right Alexander!
> The CONFIG_COMMON_CLK hasn't enable!
> But for all SOC AT91_SAM9x5 still uses old clock style (AT91_USE_OLD_CLK):
> 
> config SOC_AT91SAM9X5
>         bool "AT91SAM9x5 family"
>         select HAVE_AT91_DBGU0
>         select HAVE_FB_ATMEL
>         select SOC_AT91SAM9
>         select AT91_USE_OLD_CLK
>         select HAVE_AT91_UTMI
>         select HAVE_AT91_SMD
>         select HAVE_AT91_USB_CLK
> 
> and one of dependencies for COMMON_CLK_AT91 is don't be AT91_USE_OLD_CLK
> 
> config COMMON_CLK_AT91
>         bool
>        default AT91_PMC_UNIT && USE_OF && !AT91_USE_OLD_CLK
>         select COMMON_CLK
> 
> config OLD_CLK_AT91
>         bool
>         default AT91_PMC_UNIT && AT91_USE_OLD_CLK
> 
> 
> 
> 
> Now came my question: Can I use CONFIG_COMMON_CLK without my ARCH
> support? If not, how we will support devices that need CONFIG_COMMON_CLK?

You probably have to wait for common clock support. However you can
still hook platform data to your spi device. For a mxs add this to
arch/arm/mach-mxs/mach-mxs.c:

static int abc_spi_notifier_call(struct notifier_block *nb,
					unsigned long event, void *data)
{
	struct device *dev = data;

	if (event == BUS_NOTIFY_BIND_DRIVER)
		if (strcmp(dev_name(dev), "spi32766.0") == 0)
			dev->platform_data = &abc_pdata;

	return NOTIFY_OK;
}

static struct notifier_block abc_spi_nb = {
	.notifier_call = abc_spi_notifier_call,
};

static void __init abc_post_init(void)
{
	bus_register_notifier(&spi_bus_type, &abc_spi_nb);
}

static void __init mxs_machine_init(void)
{

	of_platform_populate(NULL, of_default_bus_match_table,
			     mxs_auxdata_lookup, NULL);

	if (of_machine_is_compatible("123,abc"))
		abc_post_init();
}

Marc

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