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iio: adc: exynos_adc: Add support for exynos7
The ADC on exynos7 is quite similar to ADCv2. The differences are as follows: - exynos7-adc has 8 input channels (as against 10 in ADCv2). - exynos7 does not include an ADC PHY control register. - Some ADC_CON2 register bits being used in ADCv2 are listed as reserved in exynos7-adc. This results in a different init_hw function for exynos7. Signed-off-by: Abhilash Kesavan <a.kesavan@samsung.com> Reviewed-by: Chanwoo Choi <cw00.choi@samsung.com> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
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@ -16,6 +16,8 @@ Required properties:
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future controllers.
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Must be "samsung,exynos3250-adc" for
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controllers compatible with ADC of Exynos3250.
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Must be "samsung,exynos7-adc" for
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the ADC in Exynos7 and compatibles
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Must be "samsung,s3c2410-adc" for
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the ADC in s3c2410 and compatibles
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Must be "samsung,s3c2416-adc" for
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@ -390,6 +390,35 @@ static const struct exynos_adc_data exynos3250_adc_data = {
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.start_conv = exynos_adc_v2_start_conv,
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};
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static void exynos_adc_exynos7_init_hw(struct exynos_adc *info)
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{
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u32 con1, con2;
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if (info->data->needs_adc_phy)
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regmap_write(info->pmu_map, info->data->phy_offset, 1);
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con1 = ADC_V2_CON1_SOFT_RESET;
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writel(con1, ADC_V2_CON1(info->regs));
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con2 = readl(ADC_V2_CON2(info->regs));
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con2 &= ~ADC_V2_CON2_C_TIME(7);
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con2 |= ADC_V2_CON2_C_TIME(0);
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writel(con2, ADC_V2_CON2(info->regs));
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/* Enable interrupts */
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writel(1, ADC_V2_INT_EN(info->regs));
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}
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static const struct exynos_adc_data exynos7_adc_data = {
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.num_channels = MAX_ADC_V1_CHANNELS,
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.mask = ADC_DATX_MASK, /* 12 bit ADC resolution */
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.init_hw = exynos_adc_exynos7_init_hw,
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.exit_hw = exynos_adc_v2_exit_hw,
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.clear_irq = exynos_adc_v2_clear_irq,
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.start_conv = exynos_adc_v2_start_conv,
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};
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static const struct of_device_id exynos_adc_match[] = {
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{
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.compatible = "samsung,s3c2410-adc",
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@ -415,6 +444,9 @@ static const struct of_device_id exynos_adc_match[] = {
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}, {
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.compatible = "samsung,exynos3250-adc",
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.data = &exynos3250_adc_data,
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}, {
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.compatible = "samsung,exynos7-adc",
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.data = &exynos7_adc_data,
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},
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{},
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};
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