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| author | Arnd Bergmann <arnd@arndb.de> | 2014-07-28 13:44:00 +0100 |
|---|---|---|
| committer | Jonathan Cameron <jic23@kernel.org> | 2014-08-07 17:36:55 +0100 |
| commit | 249535d894216f5dcd922accfb435d32d417d56f (patch) | |
| tree | dc996287bf5603197828ce4725a04d500914bac1 /drivers/iio | |
| parent | 44d6f2ef94f9825e6eb9072f1611e0ea4cd81fa1 (diff) | |
| download | lwn-249535d894216f5dcd922accfb435d32d417d56f.tar.gz lwn-249535d894216f5dcd922accfb435d32d417d56f.zip | |
iio: adc: exynos_adc: add support for s3c64xx adc
The ADC in s3c64xx is almost the same as exynosv1, but
has a different 'select' method. Adding this here will be
helpful to move over the existing s3c64xx platform from the
legacy plat-samsung/adc driver to the new exynos-adc.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Diffstat (limited to 'drivers/iio')
| -rw-r--r-- | drivers/iio/adc/exynos_adc.c | 28 |
1 files changed, 27 insertions, 1 deletions
diff --git a/drivers/iio/adc/exynos_adc.c b/drivers/iio/adc/exynos_adc.c index fc9dfc23ecb7..62631a778b1f 100644 --- a/drivers/iio/adc/exynos_adc.c +++ b/drivers/iio/adc/exynos_adc.c @@ -40,7 +40,7 @@ #include <linux/iio/machine.h> #include <linux/iio/driver.h> -/* EXYNOS4412/5250 ADC_V1 registers definitions */ +/* S3C/EXYNOS4412/5250 ADC_V1 registers definitions */ #define ADC_V1_CON(x) ((x) + 0x00) #define ADC_V1_DLY(x) ((x) + 0x08) #define ADC_V1_DATX(x) ((x) + 0x0C) @@ -61,6 +61,9 @@ #define ADC_V1_CON_PRSCLV(x) (((x) & 0xFF) << 6) #define ADC_V1_CON_STANDBY (1u << 2) +/* Bit definitions for S3C2410 ADC */ +#define ADC_S3C2410_CON_SELMUX(x) (((x) & 7) << 3) + /* Bit definitions for ADC_V2 */ #define ADC_V2_CON1_SOFT_RESET (1u << 2) @@ -217,6 +220,26 @@ static const struct exynos_adc_data exynos_adc_v1_data = { .start_conv = exynos_adc_v1_start_conv, }; +static void exynos_adc_s3c64xx_start_conv(struct exynos_adc *info, + unsigned long addr) +{ + u32 con1; + + con1 = readl(ADC_V1_CON(info->regs)); + con1 &= ~ADC_S3C2410_CON_SELMUX(0x7); + con1 |= ADC_S3C2410_CON_SELMUX(addr); + writel(con1 | ADC_CON_EN_START, ADC_V1_CON(info->regs)); +} + +static struct exynos_adc_data const exynos_adc_s3c64xx_data = { + .num_channels = MAX_ADC_V1_CHANNELS, + + .init_hw = exynos_adc_v1_init_hw, + .exit_hw = exynos_adc_v1_exit_hw, + .clear_irq = exynos_adc_v1_clear_irq, + .start_conv = exynos_adc_s3c64xx_start_conv, +}; + static void exynos_adc_v2_init_hw(struct exynos_adc *info) { u32 con1, con2; @@ -285,6 +308,9 @@ static const struct exynos_adc_data exynos3250_adc_data = { static const struct of_device_id exynos_adc_match[] = { { + .compatible = "samsung,s3c6410-adc", + .data = &exynos_adc_s3c64xx_data, + }, { .compatible = "samsung,exynos-adc-v1", .data = &exynos_adc_v1_data, }, { |