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

[Yangtao Li]

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.win...@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