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dm: adc: uclass: get reference regulator once

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device_get_supply_regulator() only needs to be called once.
But each time there's call to adc_vxx_value() for instance, it calls
adc_vxx_platdata_update() -> device_get_supply_regulator().

So, move device_get_supply_regulator() to pre_probe() routine.

This also allows vdd_supply/vss_supply to be provided directly from
uc_pdata, e.g dt-binding variant like stm32-adc provide its own
'vref-supply'.

Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Fabrice Gasnier 2018-07-24 16:31:29 +02:00 committed by Tom Rini
parent 1fe243a1e4
commit a4a87f7b74
1 changed files with 17 additions and 18 deletions
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35
drivers/adc/adc-uclass.c
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@ -264,10 +264,8 @@ static int adc_vdd_platdata_update(struct udevice *dev)
* will bind before its supply regulator device, then the below 'get'
* will return an error.
*/
ret = device_get_supply_regulator(dev, "vdd-supply",
&uc_pdata->vdd_supply);
if (ret)
return ret;
if (!uc_pdata->vdd_supply)
return 0;
ret = regulator_get_value(uc_pdata->vdd_supply);
if (ret < 0)
@ -283,10 +281,8 @@ static int adc_vss_platdata_update(struct udevice *dev)
struct adc_uclass_platdata *uc_pdata = dev_get_uclass_platdata(dev);
int ret;
ret = device_get_supply_regulator(dev, "vss-supply",
&uc_pdata->vss_supply);
if (ret)
return ret;
if (!uc_pdata->vss_supply)
return 0;
ret = regulator_get_value(uc_pdata->vss_supply);
if (ret < 0)
@ -302,14 +298,11 @@ int adc_vdd_value(struct udevice *dev, int *uV)
struct adc_uclass_platdata *uc_pdata = dev_get_uclass_platdata(dev);
int ret, value_sign = uc_pdata->vdd_polarity_negative ? -1 : 1;
if (!uc_pdata->vdd_supply)
goto nodev;
/* Update the regulator Value. */
ret = adc_vdd_platdata_update(dev);
if (ret)
return ret;
nodev:
if (uc_pdata->vdd_microvolts == -ENODATA)
return -ENODATA;
@ -323,14 +316,11 @@ int adc_vss_value(struct udevice *dev, int *uV)
struct adc_uclass_platdata *uc_pdata = dev_get_uclass_platdata(dev);
int ret, value_sign = uc_pdata->vss_polarity_negative ? -1 : 1;
if (!uc_pdata->vss_supply)
goto nodev;
/* Update the regulator Value. */
ret = adc_vss_platdata_update(dev);
if (ret)
return ret;
nodev:
if (uc_pdata->vss_microvolts == -ENODATA)
return -ENODATA;
@ -348,7 +338,12 @@ static int adc_vdd_platdata_set(struct udevice *dev)
prop = "vdd-polarity-negative";
uc_pdata->vdd_polarity_negative = dev_read_bool(dev, prop);
ret = adc_vdd_platdata_update(dev);
/* Optionally get regulators */
ret = device_get_supply_regulator(dev, "vdd-supply",
&uc_pdata->vdd_supply);
if (!ret)
return adc_vdd_platdata_update(dev);
if (ret != -ENOENT)
return ret;
@ -368,7 +363,11 @@ static int adc_vss_platdata_set(struct udevice *dev)
prop = "vss-polarity-negative";
uc_pdata->vss_polarity_negative = dev_read_bool(dev, prop);
ret = adc_vss_platdata_update(dev);
ret = device_get_supply_regulator(dev, "vss-supply",
&uc_pdata->vss_supply);
if (!ret)
return adc_vss_platdata_update(dev);
if (ret != -ENOENT)
return ret;