From: Arnd Bergmann <arnd@xxxxxxxx>
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@xxxxxxxx>
Signed-off-by: Chanwoo Choi <cw00.choi@xxxxxxxxxxx>
---
.../devicetree/bindings/arm/samsung/exynos-adc.txt | 2 ++
drivers/iio/adc/exynos_adc.c | 28 +++++++++++++++++++++-
2 files changed, 29 insertions(+), 1 deletion(-)
diff --git a/Documentation/devicetree/bindings/arm/samsung/exynos-adc.txt b/Documentation/devicetree/bindings/arm/samsung/exynos-adc.txt
index adc61b0..d3dad46 100644
--- a/Documentation/devicetree/bindings/arm/samsung/exynos-adc.txt
+++ b/Documentation/devicetree/bindings/arm/samsung/exynos-adc.txt
@@ -16,6 +16,8 @@ Required properties:
future controllers.
Must be "samsung,exynos3250-adc" for
controllers compatible with ADC of Exynos3250.
+ Must be "samsung,s3c6410-adc" for
+ the ADC in s3c6410 and compatibles
- reg: Contains ADC register address range (base address and
length) and the address of the phy enable register.
- interrupts: Contains the interrupt information for the timer. The
diff --git a/drivers/iio/adc/exynos_adc.c b/drivers/iio/adc/exynos_adc.c
index 87e0895..ed9e4c8 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 const 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 const 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,
}, {
--
1.8.0
--
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