Re: [EXT] Re: [PATCH v6 5/5] arm64: dts: freescale: add support for i.MX8DXL EVK board

[Shawn Guo <shawnguo@kernel.org>]

On Mon, Sep 12, 2022 at 02:35:18PM +0000, Shenwei Wang wrote:
> 
> 
> > -----Original Message-----
> > From: Shawn Guo <shawnguo@kernel.org>
> > Sent: Monday, September 12, 2022 3:17 AM
> > To: Shenwei Wang <shenwei.wang@nxp.com>
> > Cc: Rob Herring <robh+dt@kernel.org>; Krzysztof Kozlowski
> > <krzysztof.kozlowski+dt@linaro.org>; Sascha Hauer <s.hauer@pengutronix.de>;
> > Pengutronix Kernel Team <kernel@pengutronix.de>; Peng Fan
> > <peng.fan@nxp.com>; devicetree@vger.kernel.org; linux-arm-
> > kernel@lists.infradead.org; imx@lists.linux.dev; dl-linux-imx <linux-
> > imx@nxp.com>
> > > > > +
> > > > > +     reg_fec1_sel: regulator-1 {
> > > > > +             compatible = "regulator-fixed";
> > > > > +             regulator-name = "fec1_supply";
> > > > > +             regulator-min-microvolt = <3300000>;
> > > > > +             regulator-max-microvolt = <3300000>;
> > > > > +             gpio = <&pca6416_1 11 GPIO_ACTIVE_HIGH>;
> > > >
> > > > Missing enable-active-high?
> > >
> > > No. Enabling this regulator to select the fec1 interface instead of usdhc2.
> > Pulling this GPIO pin to low is to use FEC1 interface.
> > 
> > Then the polarity cell should be GPIO_ACTIVE_LOW rather than
> > GPIO_ACTIVE_HIGH?
> > 
> 
> That doesn't matter since any GPIO phandle flags are ignored in the node of "regulator-fixed".  The final flag is only determined by the property of "enable-active-high".  If there is a "enable-active-high", the GPIO line works as active high. If no such a property, it works as active low by default. Right?
> 

Well, we are talking about the correctness of DT (hardware description),
not how kernel driver works with DT.

Shawn