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Message-ID: <53CC3683.9090101@gmx.de> Date: Sun, 20 Jul 2014 23:37:07 +0200 From: Hartmut Knaack <knaack.h@....de> To: Arnd Bergmann <arnd@...db.de>, linux-arm-kernel@...ts.infradead.org CC: Chanwoo Choi <cw00.choi@...sung.com>, jic23@...nel.org, ch.naveen@...sung.com, mark.rutland@....com, devicetree@...r.kernel.org, kgene.kim@...sung.com, pawel.moll@....com, ijc+devicetree@...lion.org.uk, linux-iio@...r.kernel.org, t.figa@...sung.com, rdunlap@...radead.org, linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org, linux-samsung-soc@...r.kernel.org, kyungmin.park@...sung.com, robh+dt@...nel.org, galak@...eaurora.org, heiko.stuebner@...com, Ben Dooks <ben-linux@...ff.org> Subject: Re: [PATCH 1/2] iio: exynos-adc: add support for s3c64xx adc Arnd Bergmann schrieb: > 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@...db.de> > --- There are some style issues, see the comments inline. > [In reply to Exynos3250 ADC support, adding Heiko and Ben] > > I spent way too much time this week trying to clean up the > old plat-samsung/adc.c driver as preparation for s3c64xx multiplatform > support. Eventually I figured out that all that code is much simpler > done using the new driver. This adds support for s3c64xx in > samsung-adc.c, similar code changes can be done to support the > various s3c24xx variants as well. > > This first patch should be fairly straightforward but is not tested > yet. The second patch is more tricky. > > Both are based on the exynos3250 patches sent by Chanwoo Choi. > > diff --git a/Documentation/devicetree/bindings/arm/samsung/exynos-adc.txt b/Documentation/devicetree/bindings/arm/samsung/exynos-adc.txt > index 26232f98d8c5..f84e9250429b 100644 > --- a/Documentation/devicetree/bindings/arm/samsung/exynos-adc.txt > +++ b/Documentation/devicetree/bindings/arm/samsung/exynos-adc.txt > @@ -11,11 +11,21 @@ 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-v2" 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,s3c2440-adc" for > + the ADC in s3c2440 and compatibles > + Must be "samsung,s3c2443-adc" for > + the ADC in s3c2443 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 b63e88247eb2..5f95638513d2 100644 > --- a/drivers/iio/adc/exynos_adc.c > +++ b/drivers/iio/adc/exynos_adc.c > @@ -39,12 +39,16 @@ > #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_TSC(x) ((x) + 0x04) > #define ADC_V1_DLY(x) ((x) + 0x08) > #define ADC_V1_DATX(x) ((x) + 0x0C) > +#define ADC_V1_DATY(x) ((x) + 0x10) > +#define ADC_V1_UPDN(x) ((x) + 0x14) > #define ADC_V1_INTCLR(x) ((x) + 0x18) > #define ADC_V1_MUX(x) ((x) + 0x1c) > +#define ADC_V1_CLRINTPNDNUP(x) ((x) + 0x20) > > /* Future ADC_V2 registers definitions */ > #define ADC_V2_CON1(x) ((x) + 0x00) > @@ -60,6 +64,30 @@ > #define ADC_V1_CON_PRSCLV(x) (((x) & 0xFF) << 6) > #define ADC_V1_CON_STANDBY (1u << 2) > Leave a whitespace around operators below. > +#define ADC_S3C2410_CON_SELMUX(x) (((x)&0x7)<<3) > + > +/* ADCTSC Register Bits */ > +#define ADC_S3C2443_TSC_UD_SEN (1<<8) > +#define ADC_S3C2410_TSC_YM_SEN (1<<7) > +#define ADC_S3C2410_TSC_YP_SEN (1<<6) > +#define ADC_S3C2410_TSC_XM_SEN (1<<5) > +#define ADC_S3C2410_TSC_XP_SEN (1<<4) > +#define ADC_S3C2410_TSC_PULL_UP_DISABLE (1<<3) > +#define ADC_S3C2410_TSC_AUTO_PST (1<<2) > +#define ADC_S3C2410_TSC_XY_PST(x) (((x)&0x3)<<0) > + > +#define ADC_TSC_WAIT4INT (ADC_S3C2410_TSC_YM_SEN | \ > + ADC_S3C2410_TSC_YP_SEN | \ > + ADC_S3C2410_TSC_XP_SEN | \ > + ADC_S3C2410_TSC_XY_PST(3)) > + > +#define ADC_TSC_AUTOPST (ADC_S3C2410_TSC_YM_SEN | \ > + ADC_S3C2410_TSC_YP_SEN | \ > + ADC_S3C2410_TSC_XP_SEN | \ > + ADC_S3C2410_TSC_AUTO_PST | \ > + ADC_S3C2410_TSC_XY_PST(0)) > + > + > /* Bit definitions for ADC_V2 */ > #define ADC_V2_CON1_SOFT_RESET (1u << 2) > > @@ -195,6 +223,26 @@ static void exynos_adc_v1_clear_irq(struct exynos_adc *info) > writel(1, ADC_V1_INTCLR(info->regs)); > } > > +static void exynos_adc_s3c64xx_start_conv(struct exynos_adc *info, > + unsigned long addr) This indention could be a bit better. > +{ > + u32 con1; > + > + con1 = readl(ADC_V1_CON(info->regs)); > + con1 &= ~ADC_S3C2410_CON_SELMUX(7); > + 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_v1_start_conv(struct exynos_adc *info, > unsigned long addr) > { > @@ -280,6 +328,9 @@ static struct exynos_adc_data const exynos3250_adc_v2_data = { > > static const struct of_device_id exynos_adc_match[] = { > { > + .compatible = "samsung,s3c64100-adc", > + .data = &exynos_adc_s3c64xx_data, > + }, { > .compatible = "samsung,exynos-adc-v1", > .data = (void *)&exynos_adc_v1_data, > }, { > > -- > To unsubscribe from this list: send the line "unsubscribe linux-iio" in > the body of a message to majordomo@...r.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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