linux-kernel - Re: [PATCH V4 3/6] ARM: dts: imx6sx-sabreauto: add IO expander max7310 support

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Date:   Thu, 26 Apr 2018 14:24:26 -0300
From:   Fabio Estevam <festevam@...il.com>
To:     Anson Huang <anson.huang@....com>
Cc:     Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <kernel@...gutronix.de>,
        Fabio Estevam <fabio.estevam@....com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Russell King - ARM Linux <linux@...linux.org.uk>,
        dl-linux-imx <linux-imx@....com>,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V4 3/6] ARM: dts: imx6sx-sabreauto: add IO expander
 max7310 support

On Thu, Apr 26, 2018 at 3:31 AM, Anson Huang <anson.huang@....com> wrote:

> I searched the mail I sent, I can NOT found where I said "MAX7310 controls the ethernet phy"....

Initially you passed:  pinctrl-assert-gpios = <&max7322 0
GPIO_ACTIVE_HIGH> inside the fec1 node.

Then I explained that 'pinctrl-assert-gpios' is not a valid property
in mainline. It only exists in NXP vendor tree.

Then you explained:

"Sorry, I made a mistake here, the MAX7320 IO0 is for adjusting FEC1's voltage"

> There are MAX7310 users, it is just because currently those users are NOT enabled, so I can
> NOT verify them. MAX7310 is an independent I2C device, why we can NOT enable it first?
> I tested it from sysfs interface, we can control the MAX7310's IO output via echo different value
> to GPIO value, that means MAX7310 itself as an IO expander chip is working just fine, similar with PMIC,
> it is a I2C device, can be enabled independently, then consumers can be added later when they are enabled.
> Just my personal opinion, thanks.

Right, but if FEC needs max7322 IO0 at level 1 then better describe it in dts.