The ADC on exynos7 is quite similar to ADCv2. The differences are as follows: - v3 has 8 input channels (10 in v2). - v3 does not include an ADC PHY control register. - Some ADC_CON2 register bits being used in v2 are listed as reserved in v3. This results in a different init_hw function for v3. Signed-off-by: Abhilash Kesavan <a.kesavan@xxxxxxxxxxx> --- - Based on Naveen's "iio: exynos-adc: use syscon instead of ioremap" patchset http://comments.gmane.org/gmane.linux.kernel.iio/13943 .../devicetree/bindings/arm/samsung/exynos-adc.txt | 2 ++ drivers/iio/adc/exynos_adc.c | 32 ++++++++++++++++++++ 2 files changed, 34 insertions(+) diff --git a/Documentation/devicetree/bindings/arm/samsung/exynos-adc.txt b/Documentation/devicetree/bindings/arm/samsung/exynos-adc.txt index c368210..a11e32c 100644 --- a/Documentation/devicetree/bindings/arm/samsung/exynos-adc.txt +++ b/Documentation/devicetree/bindings/arm/samsung/exynos-adc.txt @@ -14,6 +14,8 @@ Required properties: for exynos4412/5250 and s5pv210 controllers. Must be "samsung,exynos-adc-v2" for future controllers. + Must be "samsung,exynos-adc-v3" for + the ADC in Exynos7 and compatibles Must be "samsung,exynos3250-adc" for controllers compatible with ADC of Exynos3250. Must be "samsung,s3c2410-adc" for diff --git a/drivers/iio/adc/exynos_adc.c b/drivers/iio/adc/exynos_adc.c index fe03177..74d0a9d 100644 --- a/drivers/iio/adc/exynos_adc.c +++ b/drivers/iio/adc/exynos_adc.c @@ -390,6 +390,35 @@ static const struct exynos_adc_data exynos3250_adc_data = { .start_conv = exynos_adc_v2_start_conv, }; +static void exynos_adc_v3_init_hw(struct exynos_adc *info) +{ + u32 con1, con2; + + if (info->data->needs_adc_phy) + regmap_write(info->pmu_map, info->data->phy_offset, 1); + + con1 = ADC_V2_CON1_SOFT_RESET; + writel(con1, ADC_V2_CON1(info->regs)); + + con2 = readl(ADC_V2_CON2(info->regs)); + con2 &= ~ADC_V2_CON2_C_TIME(7); + con2 |= ADC_V2_CON2_C_TIME(0); + writel(con2, ADC_V2_CON2(info->regs)); + + /* Enable interrupts */ + writel(1, ADC_V2_INT_EN(info->regs)); +} + +static const struct exynos_adc_data exynos_adc_v3_data = { + .num_channels = MAX_ADC_V1_CHANNELS, + .mask = ADC_DATX_MASK, /* 12 bit ADC resolution */ + + .init_hw = exynos_adc_v3_init_hw, + .exit_hw = exynos_adc_v2_exit_hw, + .clear_irq = exynos_adc_v2_clear_irq, + .start_conv = exynos_adc_v2_start_conv, +}; + static const struct of_device_id exynos_adc_match[] = { { .compatible = "samsung,s3c2410-adc", @@ -413,6 +442,9 @@ static const struct of_device_id exynos_adc_match[] = { .compatible = "samsung,exynos-adc-v2", .data = &exynos_adc_v2_data, }, { + .compatible = "samsung,exynos-adc-v3", + .data = &exynos_adc_v3_data, + }, { .compatible = "samsung,exynos3250-adc", .data = &exynos3250_adc_data, }, -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-iio" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
