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From: Anson Huang <anson.huang@nxp.com>
To: Fabio Estevam <festevam@gmail.com>
Cc: Shawn Guo <shawnguo@kernel.org>,
	Sascha Hauer <kernel@pengutronix.de>,
	Fabio Estevam <fabio.estevam@nxp.com>,
	Rob Herring <robh+dt@kernel.org>,
	Mark Rutland <mark.rutland@arm.com>,
	dl-linux-imx <linux-imx@nxp.com>,
	"moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE"
	<linux-arm-kernel@lists.infradead.org>,
	"open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS"
	<devicetree@vger.kernel.org>,
	linux-kernel <linux-kernel@vger.kernel.org>,
	Andy Duan <fugang.duan@nxp.com>
Subject: RE: [PATCH 4/5] ARM: dts: imx6sx-sabreauto: add fec support
Date: Fri, 27 Apr 2018 01:37:19 +0000	[thread overview]
Message-ID: <AM3PR04MB1315F80C9B5190F4E26DC723F58D0@AM3PR04MB1315.eurprd04.prod.outlook.com> (raw)
In-Reply-To: <CAOMZO5Df__UpcLXVUrW0sT24g=Kmu2132QeQSBE9aZrjcyqsCw@mail.gmail.com>



Anson Huang
Best Regards!


> -----Original Message-----
> From: Fabio Estevam [mailto:festevam@gmail.com]
> Sent: Friday, April 27, 2018 1:29 AM
> To: Anson Huang <anson.huang@nxp.com>
> Cc: Shawn Guo <shawnguo@kernel.org>; Sascha Hauer
> <kernel@pengutronix.de>; Fabio Estevam <fabio.estevam@nxp.com>; Rob
> Herring <robh+dt@kernel.org>; Mark Rutland <mark.rutland@arm.com>;
> dl-linux-imx <linux-imx@nxp.com>; moderated list:ARM/FREESCALE IMX / MXC
> ARM ARCHITECTURE <linux-arm-kernel@lists.infradead.org>; open list:OPEN
> FIRMWARE AND FLATTENED DEVICE TREE BINDINGS
> <devicetree@vger.kernel.org>; linux-kernel <linux-kernel@vger.kernel.org>;
> Andy Duan <fugang.duan@nxp.com>
> Subject: Re: [PATCH 4/5] ARM: dts: imx6sx-sabreauto: add fec support
> 
> On Thu, Apr 26, 2018 at 3:57 AM, Anson Huang <anson.huang@nxp.com>
> wrote:
> 
> > The 'phy-supply' is for enabling/disabling phy regulator, but here the
> > MAX7322 IO0 is NOT for enabling/disabling PHY regulator, it is for IO
> > voltage switch between 1.5V and 1.8V, our ENET IO can work with both 1.5V
> and 1.8V, so any config is OK for ENET function.
> 
> Thanks for the clarification.
> 
> > The 1.5V/1.8V selection is a one time setting thing, that means we
> > only need to config it once during boot up, most of i.MX platforms
> > does NOT provide such voltage switch function for ENET IO, on this 6SX
> > sabre auto board, it is more like a backup or validation purpose. With default
> settings, ENET's function is NOT impacted at all.
> >
> > I think we can add a gpio regulator for it and let the regulator
> > initialization set the GPIO Level for fec, such below, with "
> > enable-active-high " present, GPIO will be at LOW and voltage is 1.5V, without
> this property, GPIO will be HIGH and voltage will be 1.8V.
> > +               reg_fec: fec_io_supply {
> > +                       compatible = "regulator-gpio";
> > +                       regulator-name = "1.8V_1.5V_FEC";
> > +                       regulator-min-microvolt = <1500000>;
> > +                       regulator-max-microvolt = <1800000>;
> > +                       states = <1500000 0x0 1800000 0x1>;
> > +                       enable-gpio = <&max7322 0
> GPIO_ACTIVE_HIGH>;
> > +                       vin-supply = <&sw2_reg>;
> > +                       enable-active-high;
> 
> If there is no consumer for this regulator, the regulator API will disable it.
> 
> It seems you need a 'regulator-always-on;'.

GPIO regulator is slight different when regulator framework try to disable
those unused regulator in late phase, in _regulator_do_disable, the GPIO
regulator only got disabled when it is explicitly enabled before (ena_gpio_state
is set when regulator is enabled), but this reg_fec is NOT getting enabled, since
it only has voltage switch function. But I agree that we can anyway add 'regulator-always-on'
to avoid any confusion, will send out new patch, thanks!
 
         if (rdev->ena_pin) {
                 if (rdev->ena_gpio_state) {
                         ret = regulator_ena_gpio_ctrl(rdev, false);


Anson.

> 
> 
> > +               };
> > +
> >
> > Anson.
> >

  reply	other threads:[~2018-04-27  1:37 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-04-23  3:46 [PATCH 1/5] ARM: dts: imx6sx-sabreauto: add PMIC support Anson Huang
2018-04-23  3:46 ` [PATCH 2/5] ARM: dts: imx6sx-sabreauto: add max7322 IO expander support Anson Huang
2018-04-23  3:46 ` [PATCH 3/5] ARM: dts: imx6sx-sabreauto: add IO expander max7310 support Anson Huang
2018-04-23  3:46 ` [PATCH 4/5] ARM: dts: imx6sx-sabreauto: add fec support Anson Huang
2018-04-23 11:08   ` Fabio Estevam
2018-04-24  2:09     ` Anson Huang
2018-04-24 12:22       ` Fabio Estevam
2018-04-25  3:30         ` Anson Huang
2018-04-25  5:36           ` Anson Huang
2018-04-25 13:46             ` Fabio Estevam
2018-04-26  6:57               ` Anson Huang
2018-04-26 17:28                 ` Fabio Estevam
2018-04-27  1:37                   ` Anson Huang [this message]
2018-04-27  2:12                     ` Anson Huang
2018-05-04  8:45                 ` Shawn Guo
2018-04-23  3:46 ` [PATCH 5/5] ARM: dts: imx6sx-sabreauto: add wdog external reset support Anson Huang

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