[PATCH v3] iio: adc: rockchip_saradc: add support for rk3066-tsadc variant
Jonathan Cameron
jic23 at kernel.org
Sun Sep 21 05:40:50 PDT 2014
On 16/09/14 23:08, Hartmut Knaack wrote:
> Heiko Stübner schrieb, Am 15.09.2014 23:47:
>> 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 at sntech.de>
> Acked-by: Hartmut Knaack <knaack.h at gmx.de>
Applied to the togreg branch of iio.git -initially pushed out as testing
for the autobuilders to play.
Thanks,
Jonathan
>> ---
>> changes since v2:
>> - adapt message about the clk rate
>> changes since v1:
>> - use GENMASK instead of creating the mask manually
>> as suggested by Hartmut Knaack
>>
>> .../bindings/iio/adc/rockchip-saradc.txt | 2 +-
>> drivers/iio/adc/rockchip_saradc.c | 64 +++++++++++++++++-----
>> 2 files changed, 51 insertions(+), 15 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..b546bc1 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))
>> @@ -192,10 +234,10 @@ static int rockchip_saradc_probe(struct platform_device *pdev)
>> }
>>
>> /*
>> - * Use a default of 1MHz for the converter clock.
>> + * Use a default value 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,
>>
>
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