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BACKPORT: iio: adc: rockchip_saradc: add voltage notifier so get referenced voltage once at probe

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Add voltage notifier, no need to query regulator voltage for
every saradc read, just get regulator voltage once at probe.

Signed-off-by: David Wu <david.wu@rock-chips.com>
Signed-off-by: Simon Xue <xxm@rock-chips.com>
Reviewed-by: Heiko Stuebner <heiko@sntech.de>
Link: https://lore.kernel.org/r/20210810011007.54066-1-xxm@rock-chips.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
(cherry picked from commit cabd6e9cf2)
Change-Id: I5723398bac6e1349b60f36c0088a49884f0106bb
This commit is contained in:
David Wu
2021-08-10 09:10:07 +08:00
committed by Tao Huang
parent 25a24f5d20
commit 7c9551becd
1 changed files with 36 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

39
drivers/iio/adc/rockchip_saradc.c
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@@ -73,6 +73,7 @@ struct rockchip_saradc {
const struct rockchip_saradc_data *data;
u16 last_val;
const struct iio_chan_spec *last_chan;
struct notifier_block nb;
bool suspended;
#ifdef CONFIG_ROCKCHIP_SARADC_TEST_CHN
bool test;
@@ -499,6 +500,26 @@ out:
return IRQ_HANDLED;
}
static int rockchip_saradc_volt_notify(struct notifier_block *nb,
unsigned long event,
void *data)
{
struct rockchip_saradc *info =
container_of(nb, struct rockchip_saradc, nb);
if (event & REGULATOR_EVENT_VOLTAGE_CHANGE)
info->uv_vref = (unsigned long)data;
return NOTIFY_OK;
}
static void rockchip_saradc_regulator_unreg_notifier(void *data)
{
struct rockchip_saradc *info = data;
regulator_unregister_notifier(info->vref, &info->nb);
}
#ifdef CONFIG_ROCKCHIP_SARADC_TEST_CHN
static ssize_t saradc_test_chn_store(struct device *dev,
struct device_attribute *attr,
@@ -680,13 +701,14 @@ static int rockchip_saradc_probe(struct platform_device *pdev)
return ret;
}
info->uv_vref = regulator_get_voltage(info->vref);
if (info->uv_vref < 0) {
ret = regulator_get_voltage(info->vref);
if (ret < 0) {
dev_err(&pdev->dev, "failed to get voltage\n");
ret = info->uv_vref;
return ret;
}
info->uv_vref = ret;
ret = clk_prepare_enable(info->pclk);
if (ret < 0) {
dev_err(&pdev->dev, "failed to enable pclk\n");
@@ -727,6 +749,17 @@ static int rockchip_saradc_probe(struct platform_device *pdev)
if (ret)
return ret;
info->nb.notifier_call = rockchip_saradc_volt_notify;
ret = regulator_register_notifier(info->vref, &info->nb);
if (ret)
return ret;
ret = devm_add_action_or_reset(&pdev->dev,
rockchip_saradc_regulator_unreg_notifier,
info);
if (ret)
return ret;
#ifdef CONFIG_ROCKCHIP_SARADC_TEST_CHN
info->wq = create_singlethread_workqueue("adc_wq");
INIT_DELAYED_WORK(&info->work, rockchip_saradc_test_work);