| Message ID | 1629907.fyghANjlk9@diego (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
Heiko Stübner schrieb, Am 11.09.2014 00:22: > Older Rockchip SoCs, at least the rk3066, used a slightly modified saradc > for temperature measurements. This so called tsadc does not contain any > active parts like temperature interrupts and only supports polling the > current temperature. The returned voltage can then be converted by a > suitable thermal driver to and actual temperature and used for thermal > handling. > Looking over it again, I have a two more comments inline. > Signed-off-by: Heiko Stuebner <heiko@sntech.de> > --- > changes since v1: > - use GENMASK instead of creating the mask manually > as suggested by Hartmut Knaack > > I've also opted for simply keeping the indent mismatch in > struct rockchip_saradc, as I don't think it's worth the churn > it produces > > .../bindings/iio/adc/rockchip-saradc.txt | 2 +- > drivers/iio/adc/rockchip_saradc.c | 62 +++++++++++++++++----- > 2 files changed, 50 insertions(+), 14 deletions(-) > > diff --git a/Documentation/devicetree/bindings/iio/adc/rockchip-saradc.txt b/Documentation/devicetree/bindings/iio/adc/rockchip-saradc.txt > index 5d3ec1d..a9a5fe1 100644 > --- a/Documentation/devicetree/bindings/iio/adc/rockchip-saradc.txt > +++ b/Documentation/devicetree/bindings/iio/adc/rockchip-saradc.txt > @@ -1,7 +1,7 @@ > Rockchip Successive Approximation Register (SAR) A/D Converter bindings > > Required properties: > -- compatible: Should be "rockchip,saradc" > +- compatible: Should be "rockchip,saradc" or "rockchip,rk3066-tsadc" > - reg: physical base address of the controller and length of memory mapped > region. > - interrupts: The interrupt number to the cpu. The interrupt specifier format > diff --git a/drivers/iio/adc/rockchip_saradc.c b/drivers/iio/adc/rockchip_saradc.c > index e074a0b..99200b7 100644 > --- a/drivers/iio/adc/rockchip_saradc.c > +++ b/drivers/iio/adc/rockchip_saradc.c > @@ -18,13 +18,13 @@ > #include <linux/interrupt.h> > #include <linux/io.h> > #include <linux/of.h> > +#include <linux/of_device.h> > #include <linux/clk.h> > #include <linux/completion.h> > #include <linux/regulator/consumer.h> > #include <linux/iio/iio.h> > > #define SARADC_DATA 0x00 > -#define SARADC_DATA_MASK 0x3ff > > #define SARADC_STAS 0x04 > #define SARADC_STAS_BUSY BIT(0) > @@ -38,15 +38,22 @@ > #define SARADC_DLY_PU_SOC 0x0c > #define SARADC_DLY_PU_SOC_MASK 0x3f > > -#define SARADC_BITS 10 > #define SARADC_TIMEOUT msecs_to_jiffies(100) > > +struct rockchip_saradc_data { > + int num_bits; > + const struct iio_chan_spec *channels; > + int num_channels; > + unsigned long clk_rate; > +}; > + > struct rockchip_saradc { > void __iomem *regs; > struct clk *pclk; > struct clk *clk; > struct completion completion; > struct regulator *vref; > + const struct rockchip_saradc_data *data; > u16 last_val; > }; > > @@ -90,7 +97,7 @@ static int rockchip_saradc_read_raw(struct iio_dev *indio_dev, > } > > *val = ret / 1000; > - *val2 = SARADC_BITS; > + *val2 = info->data->num_bits; > return IIO_VAL_FRACTIONAL_LOG2; > default: > return -EINVAL; > @@ -103,7 +110,7 @@ static irqreturn_t rockchip_saradc_isr(int irq, void *dev_id) > > /* Read value */ > info->last_val = readl_relaxed(info->regs + SARADC_DATA); > - info->last_val &= SARADC_DATA_MASK; > + info->last_val &= GENMASK(info->data->num_bits - 1, 0); > > /* Clear irq & power down adc */ > writel_relaxed(0, info->regs + SARADC_CTRL); > @@ -133,12 +140,44 @@ static const struct iio_chan_spec rockchip_saradc_iio_channels[] = { > ADC_CHANNEL(2, "adc2"), > }; > > +static const struct rockchip_saradc_data saradc_data = { > + .num_bits = 10, > + .channels = rockchip_saradc_iio_channels, > + .num_channels = ARRAY_SIZE(rockchip_saradc_iio_channels), > + .clk_rate = 1000000, > +}; > + > +static const struct iio_chan_spec rockchip_rk3066_tsadc_iio_channels[] = { > + ADC_CHANNEL(0, "adc0"), > + ADC_CHANNEL(1, "adc1"), > +}; > + > +static const struct rockchip_saradc_data rk3066_tsadc_data = { > + .num_bits = 12, > + .channels = rockchip_rk3066_tsadc_iio_channels, > + .num_channels = ARRAY_SIZE(rockchip_rk3066_tsadc_iio_channels), > + .clk_rate = 50000, > +}; > + > +static const struct of_device_id rockchip_saradc_match[] = { > + { > + .compatible = "rockchip,saradc", > + .data = &saradc_data, > + }, { > + .compatible = "rockchip,rk3066-tsadc", > + .data = &rk3066_tsadc_data, > + }, > + {}, > +}; > +MODULE_DEVICE_TABLE(of, rockchip_saradc_match); > + > static int rockchip_saradc_probe(struct platform_device *pdev) > { > struct rockchip_saradc *info = NULL; > struct device_node *np = pdev->dev.of_node; > struct iio_dev *indio_dev = NULL; > struct resource *mem; > + const struct of_device_id *match; > int ret; > int irq; > > @@ -152,6 +191,9 @@ static int rockchip_saradc_probe(struct platform_device *pdev) > } > info = iio_priv(indio_dev); > > + match = of_match_device(rockchip_saradc_match, &pdev->dev); Is it 100% safe to go on without checking match for validity? > + info->data = match->data; > + > mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); > info->regs = devm_ioremap_resource(&pdev->dev, mem); > if (IS_ERR(info->regs)) > @@ -195,7 +237,7 @@ static int rockchip_saradc_probe(struct platform_device *pdev) > * Use a default of 1MHz for the converter clock. > * This may become user-configurable in the future. > */ This comment becomes invalid and should be adjusted or droped. > - ret = clk_set_rate(info->clk, 1000000); > + ret = clk_set_rate(info->clk, info->data->clk_rate); > if (ret < 0) { > dev_err(&pdev->dev, "failed to set adc clk rate, %d\n", ret); > return ret; > @@ -227,8 +269,8 @@ static int rockchip_saradc_probe(struct platform_device *pdev) > indio_dev->info = &rockchip_saradc_iio_info; > indio_dev->modes = INDIO_DIRECT_MODE; > > - indio_dev->channels = rockchip_saradc_iio_channels; > - indio_dev->num_channels = ARRAY_SIZE(rockchip_saradc_iio_channels); > + indio_dev->channels = info->data->channels; > + indio_dev->num_channels = info->data->num_channels; > > ret = iio_device_register(indio_dev); > if (ret) > @@ -296,12 +338,6 @@ static int rockchip_saradc_resume(struct device *dev) > static SIMPLE_DEV_PM_OPS(rockchip_saradc_pm_ops, > rockchip_saradc_suspend, rockchip_saradc_resume); > > -static const struct of_device_id rockchip_saradc_match[] = { > - { .compatible = "rockchip,saradc" }, > - {}, > -}; > -MODULE_DEVICE_TABLE(of, rockchip_saradc_match); > - > static struct platform_driver rockchip_saradc_driver = { > .probe = rockchip_saradc_probe, > .remove = rockchip_saradc_remove, >
Am Sonntag, 14. September 2014, 00:53:55 schrieb Hartmut Knaack: > Heiko Stübner schrieb, Am 11.09.2014 00:22: > > Older Rockchip SoCs, at least the rk3066, used a slightly modified saradc > > for temperature measurements. This so called tsadc does not contain any > > active parts like temperature interrupts and only supports polling the > > current temperature. The returned voltage can then be converted by a > > suitable thermal driver to and actual temperature and used for thermal > > handling. > > Looking over it again, I have a two more comments inline. > > > Signed-off-by: Heiko Stuebner <heiko@sntech.de> > > --- > > changes since v1: > > - use GENMASK instead of creating the mask manually > > > > as suggested by Hartmut Knaack > > > > I've also opted for simply keeping the indent mismatch in > > struct rockchip_saradc, as I don't think it's worth the churn > > it produces > > > > .../bindings/iio/adc/rockchip-saradc.txt | 2 +- > > drivers/iio/adc/rockchip_saradc.c | 62 > > +++++++++++++++++----- 2 files changed, 50 insertions(+), 14 > > deletions(-) > > > > diff --git a/Documentation/devicetree/bindings/iio/adc/rockchip-saradc.txt > > b/Documentation/devicetree/bindings/iio/adc/rockchip-saradc.txt index > > 5d3ec1d..a9a5fe1 100644 > > --- a/Documentation/devicetree/bindings/iio/adc/rockchip-saradc.txt > > +++ b/Documentation/devicetree/bindings/iio/adc/rockchip-saradc.txt > > @@ -1,7 +1,7 @@ > > > > Rockchip Successive Approximation Register (SAR) A/D Converter bindings > > > > Required properties: > > -- compatible: Should be "rockchip,saradc" > > +- compatible: Should be "rockchip,saradc" or "rockchip,rk3066-tsadc" > > > > - reg: physical base address of the controller and length of memory > > mapped > > > > region. > > > > - interrupts: The interrupt number to the cpu. The interrupt specifier > > format> > > diff --git a/drivers/iio/adc/rockchip_saradc.c > > b/drivers/iio/adc/rockchip_saradc.c index e074a0b..99200b7 100644 > > --- a/drivers/iio/adc/rockchip_saradc.c > > +++ b/drivers/iio/adc/rockchip_saradc.c > > @@ -18,13 +18,13 @@ > > > > #include <linux/interrupt.h> > > #include <linux/io.h> > > #include <linux/of.h> > > > > +#include <linux/of_device.h> > > > > #include <linux/clk.h> > > #include <linux/completion.h> > > #include <linux/regulator/consumer.h> > > #include <linux/iio/iio.h> > > > > #define SARADC_DATA 0x00 > > > > -#define SARADC_DATA_MASK 0x3ff > > > > #define SARADC_STAS 0x04 > > #define SARADC_STAS_BUSY BIT(0) > > > > @@ -38,15 +38,22 @@ > > > > #define SARADC_DLY_PU_SOC 0x0c > > #define SARADC_DLY_PU_SOC_MASK 0x3f > > > > -#define SARADC_BITS 10 > > > > #define SARADC_TIMEOUT msecs_to_jiffies(100) > > > > +struct rockchip_saradc_data { > > + int num_bits; > > + const struct iio_chan_spec *channels; > > + int num_channels; > > + unsigned long clk_rate; > > +}; > > + > > > > struct rockchip_saradc { > > > > void __iomem *regs; > > struct clk *pclk; > > struct clk *clk; > > struct completion completion; > > struct regulator *vref; > > > > + const struct rockchip_saradc_data *data; > > > > u16 last_val; > > > > }; > > > > @@ -90,7 +97,7 @@ static int rockchip_saradc_read_raw(struct iio_dev > > *indio_dev,> > > } > > > > *val = ret / 1000; > > > > - *val2 = SARADC_BITS; > > + *val2 = info->data->num_bits; > > > > return IIO_VAL_FRACTIONAL_LOG2; > > > > default: > > return -EINVAL; > > > > @@ -103,7 +110,7 @@ static irqreturn_t rockchip_saradc_isr(int irq, void > > *dev_id)> > > /* Read value */ > > info->last_val = readl_relaxed(info->regs + SARADC_DATA); > > > > - info->last_val &= SARADC_DATA_MASK; > > + info->last_val &= GENMASK(info->data->num_bits - 1, 0); > > > > /* Clear irq & power down adc */ > > writel_relaxed(0, info->regs + SARADC_CTRL); > > > > @@ -133,12 +140,44 @@ static const struct iio_chan_spec > > rockchip_saradc_iio_channels[] = {> > > ADC_CHANNEL(2, "adc2"), > > > > }; > > > > +static const struct rockchip_saradc_data saradc_data = { > > + .num_bits = 10, > > + .channels = rockchip_saradc_iio_channels, > > + .num_channels = ARRAY_SIZE(rockchip_saradc_iio_channels), > > + .clk_rate = 1000000, > > +}; > > + > > +static const struct iio_chan_spec rockchip_rk3066_tsadc_iio_channels[] = > > { > > + ADC_CHANNEL(0, "adc0"), > > + ADC_CHANNEL(1, "adc1"), > > +}; > > + > > +static const struct rockchip_saradc_data rk3066_tsadc_data = { > > + .num_bits = 12, > > + .channels = rockchip_rk3066_tsadc_iio_channels, > > + .num_channels = ARRAY_SIZE(rockchip_rk3066_tsadc_iio_channels), > > + .clk_rate = 50000, > > +}; > > + > > +static const struct of_device_id rockchip_saradc_match[] = { > > + { > > + .compatible = "rockchip,saradc", > > + .data = &saradc_data, > > + }, { > > + .compatible = "rockchip,rk3066-tsadc", > > + .data = &rk3066_tsadc_data, > > + }, > > + {}, > > +}; > > +MODULE_DEVICE_TABLE(of, rockchip_saradc_match); > > + > > > > static int rockchip_saradc_probe(struct platform_device *pdev) > > { > > > > struct rockchip_saradc *info = NULL; > > struct device_node *np = pdev->dev.of_node; > > struct iio_dev *indio_dev = NULL; > > struct resource *mem; > > > > + const struct of_device_id *match; > > > > int ret; > > int irq; > > > > @@ -152,6 +191,9 @@ static int rockchip_saradc_probe(struct > > platform_device *pdev)> > > } > > info = iio_priv(indio_dev); > > > > + match = of_match_device(rockchip_saradc_match, &pdev->dev); > > Is it 100% safe to go on without checking match for validity? In this case yes :-) The very first check in _probe is against (!np), so at this point we're sure we were already matched against one of the entries in the match-table. > > > + info->data = match->data; > > + > > > > mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); > > info->regs = devm_ioremap_resource(&pdev->dev, mem); > > if (IS_ERR(info->regs)) > > > > @@ -195,7 +237,7 @@ static int rockchip_saradc_probe(struct > > platform_device *pdev)> > > * Use a default of 1MHz for the converter clock. > > * This may become user-configurable in the future. > > */ > > This comment becomes invalid and should be adjusted or droped. I'll adapt it and send a v3 Heiko > > > - ret = clk_set_rate(info->clk, 1000000); > > + ret = clk_set_rate(info->clk, info->data->clk_rate); > > > > if (ret < 0) { > > > > dev_err(&pdev->dev, "failed to set adc clk rate, %d\n", ret); > > return ret; > > > > @@ -227,8 +269,8 @@ static int rockchip_saradc_probe(struct > > platform_device *pdev)> > > indio_dev->info = &rockchip_saradc_iio_info; > > indio_dev->modes = INDIO_DIRECT_MODE; > > > > - indio_dev->channels = rockchip_saradc_iio_channels; > > - indio_dev->num_channels = ARRAY_SIZE(rockchip_saradc_iio_channels); > > + indio_dev->channels = info->data->channels; > > + indio_dev->num_channels = info->data->num_channels; > > > > ret = iio_device_register(indio_dev); > > if (ret) > > > > @@ -296,12 +338,6 @@ static int rockchip_saradc_resume(struct device *dev) > > > > static SIMPLE_DEV_PM_OPS(rockchip_saradc_pm_ops, > > > > rockchip_saradc_suspend, rockchip_saradc_resume); > > > > -static const struct of_device_id rockchip_saradc_match[] = { > > - { .compatible = "rockchip,saradc" }, > > - {}, > > -}; > > -MODULE_DEVICE_TABLE(of, rockchip_saradc_match); > > - > > > > static struct platform_driver rockchip_saradc_driver = { > > > > .probe = rockchip_saradc_probe, > > .remove = rockchip_saradc_remove,
diff --git a/Documentation/devicetree/bindings/iio/adc/rockchip-saradc.txt b/Documentation/devicetree/bindings/iio/adc/rockchip-saradc.txt index 5d3ec1d..a9a5fe1 100644 --- a/Documentation/devicetree/bindings/iio/adc/rockchip-saradc.txt +++ b/Documentation/devicetree/bindings/iio/adc/rockchip-saradc.txt @@ -1,7 +1,7 @@ Rockchip Successive Approximation Register (SAR) A/D Converter bindings Required properties: -- compatible: Should be "rockchip,saradc" +- compatible: Should be "rockchip,saradc" or "rockchip,rk3066-tsadc" - reg: physical base address of the controller and length of memory mapped region. - interrupts: The interrupt number to the cpu. The interrupt specifier format diff --git a/drivers/iio/adc/rockchip_saradc.c b/drivers/iio/adc/rockchip_saradc.c index e074a0b..99200b7 100644 --- a/drivers/iio/adc/rockchip_saradc.c +++ b/drivers/iio/adc/rockchip_saradc.c @@ -18,13 +18,13 @@ #include <linux/interrupt.h> #include <linux/io.h> #include <linux/of.h> +#include <linux/of_device.h> #include <linux/clk.h> #include <linux/completion.h> #include <linux/regulator/consumer.h> #include <linux/iio/iio.h> #define SARADC_DATA 0x00 -#define SARADC_DATA_MASK 0x3ff #define SARADC_STAS 0x04 #define SARADC_STAS_BUSY BIT(0) @@ -38,15 +38,22 @@ #define SARADC_DLY_PU_SOC 0x0c #define SARADC_DLY_PU_SOC_MASK 0x3f -#define SARADC_BITS 10 #define SARADC_TIMEOUT msecs_to_jiffies(100) +struct rockchip_saradc_data { + int num_bits; + const struct iio_chan_spec *channels; + int num_channels; + unsigned long clk_rate; +}; + struct rockchip_saradc { void __iomem *regs; struct clk *pclk; struct clk *clk; struct completion completion; struct regulator *vref; + const struct rockchip_saradc_data *data; u16 last_val; }; @@ -90,7 +97,7 @@ static int rockchip_saradc_read_raw(struct iio_dev *indio_dev, } *val = ret / 1000; - *val2 = SARADC_BITS; + *val2 = info->data->num_bits; return IIO_VAL_FRACTIONAL_LOG2; default: return -EINVAL; @@ -103,7 +110,7 @@ static irqreturn_t rockchip_saradc_isr(int irq, void *dev_id) /* Read value */ info->last_val = readl_relaxed(info->regs + SARADC_DATA); - info->last_val &= SARADC_DATA_MASK; + info->last_val &= GENMASK(info->data->num_bits - 1, 0); /* Clear irq & power down adc */ writel_relaxed(0, info->regs + SARADC_CTRL); @@ -133,12 +140,44 @@ static const struct iio_chan_spec rockchip_saradc_iio_channels[] = { ADC_CHANNEL(2, "adc2"), }; +static const struct rockchip_saradc_data saradc_data = { + .num_bits = 10, + .channels = rockchip_saradc_iio_channels, + .num_channels = ARRAY_SIZE(rockchip_saradc_iio_channels), + .clk_rate = 1000000, +}; + +static const struct iio_chan_spec rockchip_rk3066_tsadc_iio_channels[] = { + ADC_CHANNEL(0, "adc0"), + ADC_CHANNEL(1, "adc1"), +}; + +static const struct rockchip_saradc_data rk3066_tsadc_data = { + .num_bits = 12, + .channels = rockchip_rk3066_tsadc_iio_channels, + .num_channels = ARRAY_SIZE(rockchip_rk3066_tsadc_iio_channels), + .clk_rate = 50000, +}; + +static const struct of_device_id rockchip_saradc_match[] = { + { + .compatible = "rockchip,saradc", + .data = &saradc_data, + }, { + .compatible = "rockchip,rk3066-tsadc", + .data = &rk3066_tsadc_data, + }, + {}, +}; +MODULE_DEVICE_TABLE(of, rockchip_saradc_match); + static int rockchip_saradc_probe(struct platform_device *pdev) { struct rockchip_saradc *info = NULL; struct device_node *np = pdev->dev.of_node; struct iio_dev *indio_dev = NULL; struct resource *mem; + const struct of_device_id *match; int ret; int irq; @@ -152,6 +191,9 @@ static int rockchip_saradc_probe(struct platform_device *pdev) } info = iio_priv(indio_dev); + match = of_match_device(rockchip_saradc_match, &pdev->dev); + info->data = match->data; + mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); info->regs = devm_ioremap_resource(&pdev->dev, mem); if (IS_ERR(info->regs)) @@ -195,7 +237,7 @@ static int rockchip_saradc_probe(struct platform_device *pdev) * Use a default of 1MHz for the converter clock. * This may become user-configurable in the future. */ - ret = clk_set_rate(info->clk, 1000000); + ret = clk_set_rate(info->clk, info->data->clk_rate); if (ret < 0) { dev_err(&pdev->dev, "failed to set adc clk rate, %d\n", ret); return ret; @@ -227,8 +269,8 @@ static int rockchip_saradc_probe(struct platform_device *pdev) indio_dev->info = &rockchip_saradc_iio_info; indio_dev->modes = INDIO_DIRECT_MODE; - indio_dev->channels = rockchip_saradc_iio_channels; - indio_dev->num_channels = ARRAY_SIZE(rockchip_saradc_iio_channels); + indio_dev->channels = info->data->channels; + indio_dev->num_channels = info->data->num_channels; ret = iio_device_register(indio_dev); if (ret) @@ -296,12 +338,6 @@ static int rockchip_saradc_resume(struct device *dev) static SIMPLE_DEV_PM_OPS(rockchip_saradc_pm_ops, rockchip_saradc_suspend, rockchip_saradc_resume); -static const struct of_device_id rockchip_saradc_match[] = { - { .compatible = "rockchip,saradc" }, - {}, -}; -MODULE_DEVICE_TABLE(of, rockchip_saradc_match); - static struct platform_driver rockchip_saradc_driver = { .probe = rockchip_saradc_probe, .remove = rockchip_saradc_remove,
Older Rockchip SoCs, at least the rk3066, used a slightly modified saradc for temperature measurements. This so called tsadc does not contain any active parts like temperature interrupts and only supports polling the current temperature. The returned voltage can then be converted by a suitable thermal driver to and actual temperature and used for thermal handling. Signed-off-by: Heiko Stuebner <heiko@sntech.de> --- changes since v1: - use GENMASK instead of creating the mask manually as suggested by Hartmut Knaack I've also opted for simply keeping the indent mismatch in struct rockchip_saradc, as I don't think it's worth the churn it produces .../bindings/iio/adc/rockchip-saradc.txt | 2 +- drivers/iio/adc/rockchip_saradc.c | 62 +++++++++++++++++----- 2 files changed, 50 insertions(+), 14 deletions(-)