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Date: Sun, 14 Sep 2014 00:53:55 +0200
From: Hartmut Knaack <knaack.h@....de>
To: Heiko Stübner <heiko@...ech.de>,
Jonathan Cameron <jic23@...nel.org>
CC: linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
linux-iio@...r.kernel.org, linux-rockchip@...ts.infradead.org,
devicetree@...r.kernel.org
Subject: Re: [PATCH v2] iio: adc: rockchip_saradc: add support for rk3066-tsadc
variant
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@...ech.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,
>
--
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