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Commit e748783c authored by Jean-Christophe PLAGNIOL-VILLARD's avatar Jean-Christophe PLAGNIOL-VILLARD Committed by Jonathan Cameron
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iio: at91_adc: add sleep mode support 



The sleep mode will allow to put the adc in sleep between conversion.

Signed-off-by: default avatarJean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: default avatarLudovic Desroches <ludovic.desroches@atmel.com>
Acked-by: default avatarMaxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: default avatarJonathan Cameron <jic23@kernel.org>
parent 47be16b6

Documentation/devicetree/bindings/arm/atmel-adc.txt

+1 −0
Original line number Diff line number Diff line
@@ -25,6 +25,7 @@ Optional properties: 
  - atmel,adc-use-res: String corresponding to an identifier from

		       atmel,adc-res-names property. If not specified, the highest

		       resolution will be used.

  - atmel,adc-sleep-mode: Boolean to enable sleep mode when no conversion

 

Optional trigger Nodes:

  - Required properties:

drivers/iio/adc/at91_adc.c

+10 −9
Original line number Diff line number Diff line
@@ -52,6 +52,7 @@ struct at91_adc_state { 
	void __iomem		*reg_base;

	struct at91_adc_reg_desc *registers;

	u8			startup_time;

	bool			sleep_mode;

	struct iio_trigger	**trig;

	struct at91_adc_trigger	*trigger_list;

	u32			trigger_number;
@@ -455,6 +456,8 @@ static int at91_adc_probe_dt(struct at91_adc_state *st, 
	}

	st->num_channels = prop;



	st->sleep_mode = of_property_read_bool(node, "atmel,adc-sleep-mode");



	if (of_property_read_u32(node, "atmel,adc-startup-time", &prop)) {

		dev_err(&idev->dev, "Missing adc-startup-time property in the DT.\n");

		ret = -EINVAL;
@@ -580,6 +583,7 @@ static int at91_adc_probe(struct platform_device *pdev) 
	struct iio_dev *idev;

	struct at91_adc_state *st;

	struct resource *res;

	u32 reg;



	idev = iio_device_alloc(sizeof(struct at91_adc_state));

	if (idev == NULL) {
@@ -687,16 +691,13 @@ static int at91_adc_probe(struct platform_device *pdev) 
	 */

	ticks = round_up((st->startup_time * adc_clk /

			  1000000) - 1, 8) / 8;



	reg = AT91_ADC_PRESCAL_(prsc) & AT91_ADC_PRESCAL;

	reg |= AT91_ADC_STARTUP_(ticks) & AT91_ADC_STARTUP;

	if (st->low_res)

		at91_adc_writel(st, AT91_ADC_MR,

				AT91_ADC_LOWRES |

				(AT91_ADC_PRESCAL_(prsc) & AT91_ADC_PRESCAL) |

				(AT91_ADC_STARTUP_(ticks) & AT91_ADC_STARTUP));

	else

		at91_adc_writel(st, AT91_ADC_MR,

				(AT91_ADC_PRESCAL_(prsc) & AT91_ADC_PRESCAL) |

				(AT91_ADC_STARTUP_(ticks) & AT91_ADC_STARTUP));

		reg |= AT91_ADC_LOWRES;

	if (st->sleep_mode)

		reg |= AT91_ADC_SLEEP;

	at91_adc_writel(st, AT91_ADC_MR, reg);



	/* Setup the ADC channels available on the board */

	ret = at91_adc_channel_init(idev);