Re: [PATCH 2/2] iio: adc: exynos_adc: Add support for S3C24xx ADC

Hartmut Knaack
2014-07-27T20:36:42Z

Chanwoo Choi schrieb:
> This patch add support for s3c2410/s3c2416/s3c2440/s3c2443 ADC. The s3c24xx
> is alomost same as ADCv1. But, There are a little difference as following:
> - ADCMUX register address to select channel
> - ADCDAT mask (10bit or 12bit ADC resolution according to SoC version)
Hi, just some style issues: better separate things like 10bit with a space to 10 bit, there are some instances of this type in your code. Another issue inline.
>
> Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> ---
> .../devicetree/bindings/arm/samsung/exynos-adc.txt | 10 ++-
> drivers/iio/adc/exynos_adc.c | 89 +++++++++++++++++++++-
> 2 files changed, 96 insertions(+), 3 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/arm/samsung/exynos-adc.txt b/Documentation/devicetree/bindings/arm/samsung/exynos-adc.txt
> index b6e3989..fe34c76 100644
> --- a/Documentation/devicetree/bindings/arm/samsung/exynos-adc.txt
> +++ b/Documentation/devicetree/bindings/arm/samsung/exynos-adc.txt
> @@ -11,11 +11,19 @@ New driver handles the following
>
> Required properties:
> - compatible: Must be "samsung,exynos-adc-v1"
> - for exynos4412/5250 controllers.
> + for exynos4412/5250 and s5pv210 controllers.
> Must be "samsung,exynos-adc-v2" for
> future controllers.
> Must be "samsung,exynos3250-adc" for
> controllers compatible with ADC of Exynos3250.
> + Must be "samsung,s3c2410-adc" for
> + the ADC in s3c2410 and compatibles
> + Must be "samsung,s3c2416-adc" for
> + the ADC in s3c2416 and compatibles
> + Must be "samsung,s3c2440-adc" for
> + the ADC in s3c2440 and compatibles
> + Must be "samsung,s3c2443-adc" for
> + the ADC in s3c2443 and compatibles
> Must be "samsung,s3c6410-adc" for
> the ADC in s3c6410 and compatibles
> - reg: Contains ADC register address range (base address and
> diff --git a/drivers/iio/adc/exynos_adc.c b/drivers/iio/adc/exynos_adc.c
> index 05bdd2f12..7d28032 100644
> --- a/drivers/iio/adc/exynos_adc.c
> +++ b/drivers/iio/adc/exynos_adc.c
> @@ -51,6 +51,9 @@
> #define ADC_V1_MUX(x) ((x) + 0x1c)
> #define ADC_V1_CLRINTPNDNUP(x) ((x) + 0x20)
>
> +/* S3C2410 ADC registers definitions */
> +#define ADC_S3C2410_MUX(x) ((x) + 0x18)
> +
> /* Future ADC_V2 registers definitions */
> #define ADC_V2_CON1(x) ((x) + 0x00)
> #define ADC_V2_CON2(x) ((x) + 0x04)
> @@ -67,6 +70,8 @@
>
> /* Bit definitions for S3C2410 ADC */
> #define ADC_S3C2410_CON_SELMUX(x) (((x) & 7) <<3)
> +#define ADC_S3C2410_DATX_MASK 0x3FF
> +#define ADC_S3C2416_CON_RES_SEL (1 << 3)
Since it is done this way in this driver, better use (1u << 3) here.
>
> /* Bit definitions for ADC_V2 */
> #define ADC_V2_CON1_SOFT_RESET (1u << 2)
> @@ -84,6 +89,7 @@
>
> /* Bit definitions common for ADC_V1 and ADC_V2 */
> #define ADC_CON_EN_START (1u << 0)
> +#define ADC_CON_EN_START_MASK (0x3 << 0)
> #define ADC_DATX_MASK 0xFFF
>
> #define EXYNOS_ADC_TIMEOUT (msecs_to_jiffies(100))
> @@ -101,12 +107,14 @@ struct exynos_adc {
> struct completion completion;
>
> u32 value;
> + u32 value2;
> unsigned int version;
> };
>
> struct exynos_adc_data {
> int num_channels;
> bool needs_sclk;
> + u32 mask;
>
> void (*init_hw)(struct exynos_adc *info);
> void (*exit_hw)(struct exynos_adc *info);
> @@ -217,6 +225,17 @@ static void exynos_adc_v1_start_conv(struct exynos_adc *info,
>
> static const struct exynos_adc_data const exynos_adc_v1_data = {
> .num_channels = MAX_ADC_V1_CHANNELS,
> + .mask = ADC_DATX_MASK, /* 12bit ADC resolution */
> +
> + .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_v1_start_conv,
> +};
> +
> +static struct exynos_adc_data const exynos_adc_s3c24xx_data = {
> + .num_channels = MAX_ADC_V1_CHANNELS,
> + .mask = ADC_S3C2410_DATX_MASK, /* 10bit ADC resolution */
>
> .init_hw = exynos_adc_v1_init_hw,
> .exit_hw = exynos_adc_v1_exit_hw,
> @@ -224,6 +243,55 @@ static const struct exynos_adc_data const exynos_adc_v1_data = {
> .start_conv = exynos_adc_v1_start_conv,
> };
>
> +static void exynos_adc_s3c2416_start_conv(struct exynos_adc *info,
> + unsigned long addr)
> +{
> + u32 con1;
> +
> + /* Enable 12bit ADC resolution */
> + con1 = readl(ADC_V1_CON(info->regs));
> + con1 |= ADC_S3C2416_CON_RES_SEL;
> + writel(con1, ADC_V1_CON(info->regs));
> +
> + /* Select channel for S3C2416 */
> + writel(addr, ADC_S3C2410_MUX(info->regs));
> +
> + con1 = readl(ADC_V1_CON(info->regs));
> + writel(con1 | ADC_CON_EN_START, ADC_V1_CON(info->regs));
> +}
> +
> +static struct exynos_adc_data const exynos_adc_s3c2416_data = {
> + .num_channels = MAX_ADC_V1_CHANNELS,
> + .mask = ADC_DATX_MASK, /* 12bit ADC resolution */
> +
> + .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_s3c2416_start_conv,
> +};
> +
> +static void exynos_adc_s3c2443_start_conv(struct exynos_adc *info,
> + unsigned long addr)
> +{
> + u32 con1;
> +
> + /* Select channel for S3C2433 */
> + writel(addr, ADC_S3C2410_MUX(info->regs));
> +
> + con1 = readl(ADC_V1_CON(info->regs));
> + writel(con1 | ADC_CON_EN_START, ADC_V1_CON(info->regs));
> +}
> +
> +static struct exynos_adc_data const exynos_adc_s3c2443_data = {
> + .num_channels = MAX_ADC_V1_CHANNELS,
> + .mask = ADC_S3C2410_DATX_MASK, /* 10bit ADC resolution */
> +
> + .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_s3c2443_start_conv,
> +};
> +
> static void exynos_adc_s3c64xx_start_conv(struct exynos_adc *info,
> unsigned long addr)
> {
> @@ -237,6 +305,7 @@ static void exynos_adc_s3c64xx_start_conv(struct exynos_adc *info,
>
> static struct exynos_adc_data const exynos_adc_s3c64xx_data = {
> .num_channels = MAX_ADC_V1_CHANNELS,
> + .mask = ADC_DATX_MASK, /* 12bit ADC resolution */
>
> .init_hw = exynos_adc_v1_init_hw,
> .exit_hw = exynos_adc_v1_exit_hw,
> @@ -293,6 +362,7 @@ static void exynos_adc_v2_start_conv(struct exynos_adc *info,
>
> static const struct exynos_adc_data const exynos_adc_v2_data = {
> .num_channels = MAX_ADC_V2_CHANNELS,
> + .mask = ADC_DATX_MASK, /* 12bit ADC resolution */
>
> .init_hw = exynos_adc_v2_init_hw,
> .exit_hw = exynos_adc_v2_exit_hw,
> @@ -302,6 +372,7 @@ static const struct exynos_adc_data const exynos_adc_v2_data = {
>
> static const struct exynos_adc_data const exynos3250_adc_data = {
> .num_channels = MAX_EXYNOS3250_ADC_CHANNELS,
> + .mask = ADC_DATX_MASK, /* 12bit ADC resolution */
> .needs_sclk = true,
>
> .init_hw = exynos_adc_v2_init_hw,
> @@ -312,6 +383,18 @@ static const struct exynos_adc_data const exynos3250_adc_data = {
>
> static const struct of_device_id exynos_adc_match[] = {
> {
> + .compatible = "samsung,s3c2410-adc",
> + .data = &exynos_adc_s3c24xx_data,
> + }, {
> + .compatible = "samsung,s3c2416-adc",
> + .data = &exynos_adc_s3c2416_data,
> + }, {
> + .compatible = "samsung,s3c2440-adc",
> + .data = &exynos_adc_s3c24xx_data,
> + }, {
> + .compatible = "samsung,s3c2443-adc",
> + .data = &exynos_adc_s3c2443_data,
> + }, {
> .compatible = "samsung,s3c6410-adc",
> .data = &exynos_adc_s3c64xx_data,
> }, {
> @@ -365,7 +448,7 @@ static int exynos_read_raw(struct iio_dev *indio_dev,
> ret = -ETIMEDOUT;
> } else {
> *val = info->value;
> - *val2 = 0;
> + *val2 = info->value2;
> ret = IIO_VAL_INT;
> }
>
> @@ -377,9 +460,11 @@ static int exynos_read_raw(struct iio_dev *indio_dev,
> static irqreturn_t exynos_adc_isr(int irq, void *dev_id)
> {
> struct exynos_adc *info = (struct exynos_adc *)dev_id;
> + u32 mask = info->data->mask;
>
> /* Read value */
> - info->value = readl(ADC_V1_DATX(info->regs)) & ADC_DATX_MASK;
> + info->value = readl(ADC_V1_DATX(info->regs)) & mask;
> + info->value2 = readl(ADC_V1_DATY(info->regs)) & mask;
>
> /* clear irq */
> if (info->data->clear_irq)