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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: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com> Signed-off-by: Ludovic Desroches <ludovic.desroches@atmel.com> Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
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parent
47be16b668
commit
e748783c55
2 changed files with 11 additions and 9 deletions
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@ -25,6 +25,7 @@ Optional properties:
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- atmel,adc-use-res: String corresponding to an identifier from
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atmel,adc-res-names property. If not specified, the highest
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resolution will be used.
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- atmel,adc-sleep-mode: Boolean to enable sleep mode when no conversion
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Optional trigger Nodes:
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- Required properties:
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@ -52,6 +52,7 @@ struct at91_adc_state {
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void __iomem *reg_base;
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struct at91_adc_reg_desc *registers;
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u8 startup_time;
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bool sleep_mode;
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struct iio_trigger **trig;
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struct at91_adc_trigger *trigger_list;
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u32 trigger_number;
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@ -455,6 +456,8 @@ static int at91_adc_probe_dt(struct at91_adc_state *st,
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}
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st->num_channels = prop;
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st->sleep_mode = of_property_read_bool(node, "atmel,adc-sleep-mode");
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if (of_property_read_u32(node, "atmel,adc-startup-time", &prop)) {
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dev_err(&idev->dev, "Missing adc-startup-time property in the DT.\n");
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ret = -EINVAL;
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@ -580,6 +583,7 @@ static int at91_adc_probe(struct platform_device *pdev)
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struct iio_dev *idev;
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struct at91_adc_state *st;
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struct resource *res;
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u32 reg;
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idev = iio_device_alloc(sizeof(struct at91_adc_state));
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if (idev == NULL) {
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@ -687,16 +691,13 @@ static int at91_adc_probe(struct platform_device *pdev)
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*/
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ticks = round_up((st->startup_time * adc_clk /
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1000000) - 1, 8) / 8;
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reg = AT91_ADC_PRESCAL_(prsc) & AT91_ADC_PRESCAL;
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reg |= AT91_ADC_STARTUP_(ticks) & AT91_ADC_STARTUP;
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if (st->low_res)
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at91_adc_writel(st, AT91_ADC_MR,
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AT91_ADC_LOWRES |
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(AT91_ADC_PRESCAL_(prsc) & AT91_ADC_PRESCAL) |
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(AT91_ADC_STARTUP_(ticks) & AT91_ADC_STARTUP));
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else
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at91_adc_writel(st, AT91_ADC_MR,
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(AT91_ADC_PRESCAL_(prsc) & AT91_ADC_PRESCAL) |
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(AT91_ADC_STARTUP_(ticks) & AT91_ADC_STARTUP));
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reg |= AT91_ADC_LOWRES;
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if (st->sleep_mode)
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reg |= AT91_ADC_SLEEP;
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at91_adc_writel(st, AT91_ADC_MR, reg);
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/* Setup the ADC channels available on the board */
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ret = at91_adc_channel_init(idev);
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