Hi Peter,

Peter Cai peter@typeblog.net 于2022年2月5日周六 21:49写道：

Mirroring commit 97ab802aa36f ("adc: meson-saradc: add support for getting reference voltage value") for meson-saradc, this adds support for getting the "vref-supply" regulator and register it as the ADC's reference voltage regulator, so clients can translate sampled ADC values to voltage.

Signed-off-by: Peter Cai peter@typeblog.net Reviewed-by: John Keeping john@metanate.com Tested-by: John Keeping john@metanate.com Cc: Simon Glass sjg@chromium.org Cc: Philipp Tomsich philipp.tomsich@vrull.eu Cc: Kever Yang kever.yang@rock-chips.com

Reviewed-by: Kever Yang kever.yang@rock-chips.com

Thanks, - Kever

---

Changes in v2:

• Reordered local variables in `rockchip_saradc_probe`.

---

drivers/adc/rockchip-saradc.c | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+)

diff --git a/drivers/adc/rockchip-saradc.c b/drivers/adc/rockchip-saradc.c index e464d33f2267..4007188133c8 100644 --- a/drivers/adc/rockchip-saradc.c +++ b/drivers/adc/rockchip-saradc.c @@ -13,6 +13,7 @@ #include <asm/io.h> #include <linux/bitops.h> #include <linux/err.h> +#include <power/regulator.h>

#define SARADC_CTRL_CHN_MASK GENMASK(2, 0) #define SARADC_CTRL_POWER_CTRL BIT(3) @@ -100,8 +101,11 @@ int rockchip_saradc_stop(struct udevice *dev)

int rockchip_saradc_probe(struct udevice *dev) {

•   struct adc_uclass_plat *uc_pdata = dev_get_uclass_plat(dev);
    struct rockchip_saradc_priv *priv = dev_get_priv(dev);
  

•   struct udevice *vref;
    struct clk clk;
  

•   int vref_uv;
    int ret;
  
    ret = clk_get_by_index(dev, 0, &clk);
  

@@ -114,6 +118,23 @@ int rockchip_saradc_probe(struct udevice *dev)

    priv->active_channel = -1;

•   ret = device_get_supply_regulator(dev, "vref-supply", &vref);
  

•   if (ret) {
  

•           printf("can't get vref-supply: %d\n", ret);
  

•           return ret;
  

•   }
  

•   vref_uv = regulator_get_value(vref);
  

•   if (vref_uv < 0) {
  

•           printf("can't get vref-supply value: %d\n", vref_uv);
  

•           return vref_uv;
  

•   }
  

•   /* VDD supplied by common vref pin */
  

•   uc_pdata->vdd_supply = vref;
  

•   uc_pdata->vdd_microvolts = vref_uv;
  

•   uc_pdata->vss_microvolts = 0;
  

•   return 0;
  

}

-- 2.35.1