[PATCH 4/7] iio: adc: sun4i-gpadc-iio: support clocks and reset

Yangtao Li
2019-05-03T07:28:55Z

H6 has bus clock and a reset, so introduce something in
gpadc_data/sun4i_gpadc_iio and adds the process of the
clocks and resets.

This is pre-work for supprt it.

Signed-off-by: Yangtao Li <tiny.windzz@gmail.com>
---
drivers/iio/adc/sun4i-gpadc-iio.c | 32 +++++++++++++++++++++++++++++--
1 file changed, 30 insertions(+), 2 deletions(-)

diff --git a/drivers/iio/adc/sun4i-gpadc-iio.c b/drivers/iio/adc/sun4i-gpadc-iio.c
index de6b8556a549..f24eb76d65c0 100644
--- a/drivers/iio/adc/sun4i-gpadc-iio.c
+++ b/drivers/iio/adc/sun4i-gpadc-iio.c
@@ -22,6 +22,7 @@
* shutdown for not being used.
*/

+#include <linux/clk.h>
#include <linux/completion.h>
#include <linux/interrupt.h>
#include <linux/io.h>
@@ -31,6 +32,7 @@
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/regmap.h>
+#include <linux/reset.h>
#include <linux/thermal.h>
#include <linux/delay.h>

@@ -52,6 +54,8 @@ static unsigned int sun6i_gpadc_chan_select(unsigned int chan)
struct sun4i_gpadc_iio;

struct gpadc_data {
+ bool has_bus_clk;
+ bool has_bus_rst;
int temp_offset;
int temp_scale;
unsigned int tp_mode_en;
@@ -140,6 +144,8 @@ struct sun4i_gpadc_iio {
struct mutex mutex;
struct sun4i_sensor_tzd tzds[MAX_SENSOR_COUNT];
struct device *sensor_device;
+ struct clk *bus_clk;
+ struct reset_control *reset;
};

#define SUN4I_GPADC_ADC_CHANNEL(_channel, _name) { \
@@ -564,14 +570,36 @@ static int sun4i_gpadc_probe_dt(struct platform_device *pdev,
if (IS_ERR(base))
return PTR_ERR(base);

- info->regmap = devm_regmap_init_mmio(&pdev->dev, base,
- &sun4i_gpadc_regmap_config);
+ if (info->data->has_bus_clk)
+ info->regmap = devm_regmap_init_mmio_clk(&pdev->dev, "bus",
+ base,
+ &sun4i_gpadc_regmap_config);
+ else
+ info->regmap = devm_regmap_init_mmio(&pdev->dev, base,
+ &sun4i_gpadc_regmap_config);
+
if (IS_ERR(info->regmap)) {
ret = PTR_ERR(info->regmap);
dev_err(&pdev->dev, "failed to init regmap: %d\n", ret);
return ret;
}

+ if (info->data->has_bus_rst) {
+ info->reset = devm_reset_control_get(&pdev->dev, "bus");
+ if (IS_ERR(info->reset)) {
+ ret = PTR_ERR(info->reset);
+ return ret;
+ }
+ }
+
+ if (info->data->has_bus_clk) {
+ info->bus_clk = devm_clk_get(&pdev->dev, "bus");
+ if (IS_ERR(info->bus_clk)) {
+ ret = PTR_ERR(info->bus_clk);
+ return ret;
+ }
+ }
+
if (IS_ENABLED(CONFIG_THERMAL_OF))
info->sensor_device = &pdev->dev;

--
2.17.1