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Subject[PATCH v2 07/16] iio: adc: sun4i-gpadc-iio: rework: support nvmem calibration data
Date
This patch reworks the driver to support nvmem calibration cells.
The driver checks if the nvmem calibration is supported and reads out
the nvmem.

Signed-off-by: Philipp Rossak <embed3d@gmail.com>
---
drivers/iio/adc/sun4i-gpadc-iio.c | 44 +++++++++++++++++++++++++++++++++++++++
1 file changed, 44 insertions(+)

diff --git a/drivers/iio/adc/sun4i-gpadc-iio.c b/drivers/iio/adc/sun4i-gpadc-iio.c
index ac9ad2f8232f..74eeb5cd5218 100644
--- a/drivers/iio/adc/sun4i-gpadc-iio.c
+++ b/drivers/iio/adc/sun4i-gpadc-iio.c
@@ -27,6 +27,7 @@
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/module.h>
+#include <linux/nvmem-consumer.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
@@ -74,6 +75,7 @@ struct gpadc_data {
bool has_bus_rst;
bool has_mod_clk;
int sensor_count;
+ bool supports_nvmem;
};

static const struct gpadc_data sun4i_gpadc_data = {
@@ -87,6 +89,7 @@ static const struct gpadc_data sun4i_gpadc_data = {
.sample_start = sun4i_gpadc_sample_start,
.sample_end = sun4i_gpadc_sample_end,
.sensor_count = 1,
+ .supports_nvmem = false,
};

static const struct gpadc_data sun5i_gpadc_data = {
@@ -100,6 +103,7 @@ static const struct gpadc_data sun5i_gpadc_data = {
.sample_start = sun4i_gpadc_sample_start,
.sample_end = sun4i_gpadc_sample_end,
.sensor_count = 1,
+ .supports_nvmem = false,
};

static const struct gpadc_data sun6i_gpadc_data = {
@@ -113,6 +117,7 @@ static const struct gpadc_data sun6i_gpadc_data = {
.sample_start = sun4i_gpadc_sample_start,
.sample_end = sun4i_gpadc_sample_end,
.sensor_count = 1,
+ .supports_nvmem = false,
};

static const struct gpadc_data sun8i_a33_gpadc_data = {
@@ -123,6 +128,7 @@ static const struct gpadc_data sun8i_a33_gpadc_data = {
.sample_start = sun4i_gpadc_sample_start,
.sample_end = sun4i_gpadc_sample_end,
.sensor_count = 1,
+ .supports_nvmem = false,
};

struct sun4i_gpadc_iio {
@@ -141,6 +147,8 @@ struct sun4i_gpadc_iio {
struct clk *mod_clk;
struct reset_control *reset;
int sensor_id;
+ u32 calibration_data[2];
+ bool has_calibration_data[2];
/* prevents concurrent reads of temperature and ADC */
struct mutex mutex;
struct thermal_zone_device *tzd;
@@ -561,6 +569,9 @@ static int sun4i_gpadc_probe_dt(struct platform_device *pdev,
struct resource *mem;
void __iomem *base;
int ret;
+ struct nvmem_cell *cell;
+ ssize_t cell_size;
+ u64 *cell_data;

info->data = of_device_get_match_data(&pdev->dev);
if (!info->data)
@@ -575,6 +586,39 @@ static int sun4i_gpadc_probe_dt(struct platform_device *pdev,
if (IS_ERR(base))
return PTR_ERR(base);

+ info->has_calibration_data[0] = false;
+ info->has_calibration_data[1] = false;
+
+ if (!info->data->supports_nvmem)
+ goto no_nvmem;
+
+ cell = nvmem_cell_get(&pdev->dev, "calibration");
+ if (IS_ERR(cell)) {
+ if (PTR_ERR(cell) == -EPROBE_DEFER)
+ return PTR_ERR(cell);
+ goto no_nvmem;
+ }
+
+ cell_data = (u64 *)nvmem_cell_read(cell, &cell_size);
+ nvmem_cell_put(cell);
+ switch (cell_size) {
+ case 8:
+ case 6:
+ info->has_calibration_data[1] = true;
+ info->calibration_data[1] = be32_to_cpu(
+ upper_32_bits(cell_data[0]));
+ case 4:
+ case 2:
+ info->has_calibration_data[0] = true;
+ info->calibration_data[0] = be32_to_cpu(
+ lower_32_bits(cell_data[0]));
+ break;
+ default:
+ break;
+ }
+
+no_nvmem:
+
info->regmap = devm_regmap_init_mmio(&pdev->dev, base,
&sun4i_gpadc_regmap_config);
if (IS_ERR(info->regmap)) {
--
2.11.0
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