On Tue, Oct 28, 2014 at 03:28:52PM +0530, Lokesh Vutla wrote: > Certain SoCs such as DRA7, RTC is an independent voltage domain of it's own > and on platforms such as DRA7-evm, this may be supplied by individual > regulator on it's own. > So make the OMAP RTC driver support a power regulator. > > Signed-off-by: Lokesh Vutla <lokeshvu...@ti.com> > --- > - Dropped the Reviewed-by tags as this patch is changed from previous version. > Documentation/devicetree/bindings/rtc/rtc-omap.txt | 6 ++++ > drivers/rtc/rtc-omap.c | 41 > +++++++++++++++++++++- > 2 files changed, 46 insertions(+), 1 deletion(-) > > diff --git a/Documentation/devicetree/bindings/rtc/rtc-omap.txt > b/Documentation/devicetree/bindings/rtc/rtc-omap.txt > index 750efd4..c1d84ac 100644 > --- a/Documentation/devicetree/bindings/rtc/rtc-omap.txt > +++ b/Documentation/devicetree/bindings/rtc/rtc-omap.txt > @@ -15,6 +15,9 @@ Required properties: > Optional properties: > - ti,system-power-controller: whether the rtc is controlling the system power > through pmic_power_en > +- vrtc-supply: phandle to the regulator device tree node. > +- vrtc-minuV: Minimum required voltage in uV, If default voltage needs to be > changed > +- vrtc-maxuV: Maximum acceptable voltage in uV, If default voltage needs to > be changed
huh ? minuV and maxuV is already part of the regulator binding itself.
> @@ -514,6 +516,37 @@ static int omap_rtc_probe(struct platform_device *pdev)
> if (IS_ERR(rtc->base))
> return PTR_ERR(rtc->base);
>
> + rtc->supply = devm_regulator_get_optional(&pdev->dev, "vrtc");
I'm not sure if this is optional either, it's just that many of our
current DTS don't really pass a regulator to RTC, right ?
> + if (IS_ERR(rtc->supply)) {
> + if (PTR_ERR(rtc->supply) == -EPROBE_DEFER)
> + return -EPROBE_DEFER;
> +
> + rtc->supply = NULL;
> + }
> +
> + if (rtc->supply) {
> + of_property_read_u32(pdev->dev.of_node, "vrtc-minuV",
> + &vrtc_minuV);
> + of_property_read_u32(pdev->dev.of_node, "vrtc-maxuV",
> + &vrtc_maxuV);
> + if (vrtc_minuV && vrtc_maxuV) {
> + ret = regulator_set_voltage(rtc->supply,
> + vrtc_minuV, vrtc_maxuV);
> + if (ret) {
> + dev_err(&pdev->dev, "failed to set volt %d\n",
> + ret);
> + return ret;
> + }
> + }
I'd really like to Mark's comments here but I was under the impression
that if the binding already gives min_microvolt == max_microvolt then
driver shouldn't really care about a set_voltage. Mark ?
> +
> + ret = regulator_enable(rtc->supply);
> + if (ret) {
> + dev_err(&pdev->dev, "regulator enable failed %d\n",
> + ret);
> + return ret;
> + }
> + }
> +
> platform_set_drvdata(pdev, rtc);
>
> /* Enable the clock/module so that we can access the registers */
> @@ -624,6 +657,9 @@ err:
> pm_runtime_put_sync(&pdev->dev);
> pm_runtime_disable(&pdev->dev);
>
> + if (rtc->supply)
> + regulator_disable(rtc->supply);
> +
> return ret;
> }
>
> @@ -649,6 +685,9 @@ static int __exit omap_rtc_remove(struct platform_device
> *pdev)
> pm_runtime_put_sync(&pdev->dev);
> pm_runtime_disable(&pdev->dev);
>
> + if (rtc->supply)
> + regulator_disable(rtc->supply);
> +
> return 0;
> }
>
> --
> 1.9.1
>
--
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