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Commit 678a0222 authored by Roland Stigge's avatar Roland Stigge Committed by Arnd Bergmann
Browse files

ARM: LPC32xx: ADC support for mach-lpc32xx 



This patch adds the mach specific support for the LPC32XX ADC driver (the
latter being already in staging/iio)

Signed-off-by: default avatarRoland Stigge <stigge@antcom.de>
Acked-by: default avatarJonathan Cameron <jic23@kernel.org>
Acked-by: default avatarWolfram Sang <w.sang@pengutronix.de>
Signed-off-by: default avatarArnd Bergmann <arnd@arndb.de>
parent b01543df

arch/arm/mach-lpc32xx/clock.c

+36 −0
Original line number Diff line number Diff line
@@ -719,6 +719,41 @@ static struct clk clk_tsc = { 
	.get_rate	= local_return_parent_rate,

};



static int adc_onoff_enable(struct clk *clk, int enable)

{

	u32 tmp;

	u32 divider;



	/* Use PERIPH_CLOCK */

	tmp = __raw_readl(LPC32XX_CLKPWR_ADC_CLK_CTRL_1);

	tmp |= LPC32XX_CLKPWR_ADCCTRL1_PCLK_SEL;

	/*

	 * Set clock divider so that we have equal to or less than

	 * 4.5MHz clock at ADC

	 */

	divider = clk->get_rate(clk) / 4500000 + 1;

	tmp |= divider;

	__raw_writel(tmp, LPC32XX_CLKPWR_ADC_CLK_CTRL_1);



	/* synchronize rate of this clock w/ actual HW setting */

	clk->rate = clk->get_rate(clk->parent) / divider;



	if (enable == 0)

		__raw_writel(0, clk->enable_reg);

	else

		__raw_writel(clk->enable_mask, clk->enable_reg);



	return 0;

}



static struct clk clk_adc = {

	.parent		= &clk_pclk,

	.enable		= adc_onoff_enable,

	.enable_reg	= LPC32XX_CLKPWR_ADC_CLK_CTRL,

	.enable_mask	= LPC32XX_CLKPWR_ADC32CLKCTRL_CLK_EN,

	.get_rate	= local_return_parent_rate,

};



static int mmc_onoff_enable(struct clk *clk, int enable)

{

	u32 tmp;
@@ -1075,6 +1110,7 @@ static struct clk_lookup lookups[] = { 
	_REGISTER_CLOCK("dev:ssp1", NULL, clk_ssp1)

	_REGISTER_CLOCK("lpc32xx_keys.0", NULL, clk_kscan)

	_REGISTER_CLOCK("lpc32xx-nand.0", "nand_ck", clk_nand)

	_REGISTER_CLOCK("lpc32xx-adc", NULL, clk_adc)

	_REGISTER_CLOCK("tbd", "i2s0_ck", clk_i2s0)

	_REGISTER_CLOCK("tbd", "i2s1_ck", clk_i2s1)

	_REGISTER_CLOCK("ts-lpc32xx", NULL, clk_tsc)

arch/arm/mach-lpc32xx/common.c

+22 −0
Original line number Diff line number Diff line
@@ -137,6 +137,28 @@ struct platform_device lpc32xx_rtc_device = { 
	.resource = lpc32xx_rtc_resources,

};



/*

 * ADC support

 */

static struct resource adc_resources[] = {

	{

		.start = LPC32XX_ADC_BASE,

		.end = LPC32XX_ADC_BASE + SZ_4K - 1,

		.flags = IORESOURCE_MEM,

	}, {

		.start = IRQ_LPC32XX_TS_IRQ,

		.end = IRQ_LPC32XX_TS_IRQ,

		.flags = IORESOURCE_IRQ,

	},

};



struct platform_device lpc32xx_adc_device = {

	.name =  "lpc32xx-adc",

	.id = -1,

	.num_resources = ARRAY_SIZE(adc_resources),

	.resource = adc_resources,

};



/*

 * Returns the unique ID for the device

 */

arch/arm/mach-lpc32xx/common.h

+1 −0
Original line number Diff line number Diff line
@@ -29,6 +29,7 @@ extern struct platform_device lpc32xx_i2c0_device; 
extern struct platform_device lpc32xx_i2c1_device;

extern struct platform_device lpc32xx_i2c2_device;

extern struct platform_device lpc32xx_tsc_device;

extern struct platform_device lpc32xx_adc_device;

extern struct platform_device lpc32xx_rtc_device;



/*

arch/arm/mach-lpc32xx/phy3250.c

+1 −0
Original line number Diff line number Diff line
@@ -276,6 +276,7 @@ static struct platform_device *phy3250_devs[] __initdata = { 
	&lpc32xx_i2c2_device,

	&lpc32xx_watchdog_device,

	&lpc32xx_gpio_led_device,

	&lpc32xx_adc_device,

};



static struct amba_device *amba_devs[] __initdata = {