Hi Fabrice,
On 23 July 2018 at 06:35, Fabrice Gasnier fabrice.gasnier@st.com wrote:
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().
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
drivers/adc/adc-uclass.c | 21 +++++++++++++-------- 1 file changed, 13 insertions(+), 8 deletions(-)
The original code doesn't look right to me.
Reading from the DT should happen in the ofdata_to_platdata() method, except (as here) where we need to probe another device, iwc we can use the probe() method.
So can you move this code into a new probe() method, so it just happens once, when the device is probed?
diff --git a/drivers/adc/adc-uclass.c b/drivers/adc/adc-uclass.c index 17c1a4e..70f4cde 100644 --- a/drivers/adc/adc-uclass.c +++ b/drivers/adc/adc-uclass.c @@ -264,10 +264,13 @@ 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) {/* Only get vdd_supply once */ret = device_get_supply_regulator(dev, "vdd-supply",&uc_pdata->vdd_supply);if (ret)return ret;} ret = regulator_get_value(uc_pdata->vdd_supply); if (ret < 0)@@ -283,10 +286,12 @@ 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) {ret = device_get_supply_regulator(dev, "vss-supply",&uc_pdata->vss_supply);if (ret)return ret;} ret = regulator_get_value(uc_pdata->vss_supply); if (ret < 0)-- 1.9.1
Regards, Simon