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Date:	Sun, 27 Jul 2014 22:35:57 +0200
From:	Hartmut Knaack <knaack.h@....de>
To:	Chanwoo Choi <cw00.choi@...sung.com>, jic23@...nel.org
CC:	ch.naveen@...sung.com, arnd@...db.de, kgene.kim@...sung.com,
	kyungmin.park@...sung.com, t.figa@...sung.com,
	linux-iio@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	devicetree@...r.kernel.org, linux-doc@...r.kernel.org
Subject: Re: [PATCH 2/2] iio: adc: exynos_adc: Add support for S3C24xx ADC

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@...sung.com>
> Signed-off-by: Arnd Bergmann <arnd@...db.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)

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