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SubjectRe: [PATCH 07/12] arm64: dts: allwinner: orange-pi-3: Enable ethernet
On Tue, Apr 09, 2019 at 01:22:32AM +0200, Ondřej Jirman wrote:
> On Mon, Apr 08, 2019 at 09:40:42AM +0200, Maxime Ripard wrote:
> > On Sat, Apr 06, 2019 at 01:45:09AM +0200, megous@megous.com wrote:
> > > From: Ondrej Jirman <megous@megous.com>
> > >
> > > Orange Pi 3 has two regulators that power the Realtek RTL8211E.
> > > According to the phy datasheet, both regulators need to be enabled
> > > at the same time, but we can only specify a single phy-supply in
> > > the DT.
> > >
> > > This can be achieved by making one regulator depedning on the
> > > other via vin-supply. While it's not a technically correct
> > > description of the hardware, it achieves the purpose.
> > >
> > > All values of RX/TX delay were tested exhaustively and a middle
> > > one of the working values was chosen.
> > >
> > > Signed-off-by: Ondrej Jirman <megous@megous.com>
> > > ---
> > > .../dts/allwinner/sun50i-h6-orangepi-3.dts | 44 +++++++++++++++++++
> > > 1 file changed, 44 insertions(+)
> > >
> > > diff --git a/arch/arm64/boot/dts/allwinner/sun50i-h6-orangepi-3.dts b/arch/arm64/boot/dts/allwinner/sun50i-h6-orangepi-3.dts
> > > index 644946749088..5270142527f5 100644
> > > --- a/arch/arm64/boot/dts/allwinner/sun50i-h6-orangepi-3.dts
> > > +++ b/arch/arm64/boot/dts/allwinner/sun50i-h6-orangepi-3.dts
> > > @@ -15,6 +15,7 @@
> > >
> > > aliases {
> > > serial0 = &uart0;
> > > + ethernet0 = &emac;
> > > };
> > >
> > > chosen {
> > > @@ -64,6 +65,27 @@
> > > regulator-max-microvolt = <5000000>;
> > > regulator-always-on;
> > > };
> > > +
> > > + /*
> > > + * The board uses 2.5V RGMII signalling. Power sequence
> > > + * to enable the phy is to enable GMAC-2V5 and GMAC-3V3 (aldo2)
> > > + * power rails at the same time and to wait 100ms.
> > > + */
> > > + reg_gmac_2v5: gmac-2v5 {
> > > + compatible = "regulator-fixed";
> > > + regulator-name = "gmac-2v5";
> > > + regulator-min-microvolt = <2500000>;
> > > + regulator-max-microvolt = <2500000>;
> > > + startup-delay-us = <100000>;
> > > + enable-active-high;
> > > + gpio = <&pio 3 6 GPIO_ACTIVE_HIGH>; /* PD6 */
> >
> > Is enable-active-high still needed? It's redundant with the
> > GPIO_ACTIVE_HIGH flag.
>
> Looking at the code, use/non-use of enable-active-high inhibits
> flags specified in gpio property. So the GPIO_ACTIVE_HIGH flag
> is ignored here (had GPIO_ACTIVE_LOW been used, the kernel would
> ignore it too and print a warning).
>
> So enable-active-high is still necessary here.

Too bad :/

> See comment in gpiolib-of.c where this is handled:
>
> /*
> * The regulator GPIO handles are specified such that the
> * presence or absence of "enable-active-high" solely controls
> * the polarity of the GPIO line. Any phandle flags must
> * be actively ignored.
> */

Thanks for digging this out

Maxime

--
Maxime Ripard, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com
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