linux-kernel - RE: [PATCH 00/14] arm64: dts: imx8mp: correct pad settings

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Date:   Wed, 22 Jun 2022 08:14:30 +0000
From:   Peng Fan <peng.fan@....com>
To:     Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>,
        "Peng Fan (OSS)" <peng.fan@....nxp.com>
CC:     "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "krzysztof.kozlowski+dt@...aro.org" 
        <krzysztof.kozlowski+dt@...aro.org>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        "festevam@...il.com" <festevam@...il.com>,
        dl-linux-imx <linux-imx@....com>,
        "hvilleneuve@...onoff.com" <hvilleneuve@...onoff.com>,
        "l.stach@...gutronix.de" <l.stach@...gutronix.de>,
        "abbaraju.manojsai@...rulasolutions.com" 
        <abbaraju.manojsai@...rulasolutions.com>,
        "jagan@...rulasolutions.com" <jagan@...rulasolutions.com>,
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        "tharvey@...eworks.com" <tharvey@...eworks.com>,
        "t.remmet@...tec.de" <T.remmet@...tec.de>,
        "t.remmet@...tec.deh" <t.remmet@...tec.deh>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 00/14] arm64: dts: imx8mp: correct pad settings

> Subject: Re: [PATCH 00/14] arm64: dts: imx8mp: correct pad settings
> 
> Hello,
> 
> On Wed, Jun 22, 2022 at 02:13:56PM +0800, Peng Fan (OSS) wrote:
> > From: Peng Fan <peng.fan@....com>
> >
> > i.MX8MP iomux pad BIT3 and BIT0 are reserved bits. Writing 1 to the
> > reserved bit will be ignored and reading will still return 0. Although
> > function not broken with reserved bits set, we should not set reserved
> > bits.
> 
> I wonder how you found these. Some time ago I wrote a tool for such issues[1].
> Currently it only supports i.MX25, i.MX6DL and i.MX6Q, but extending it for
> the other SoCs should be only some industious effort.

We have customer has question about the dts pad settings in U-Boot. Since the
dts in U-Boot was synced from Linux kernel tree, and I found
the current settings in kernel dts not match with latest reference manual.

Regards,
Peng.

> 
> Best regards
> Uwe
> 
> [1]
> https://git.pengutronix.de/cgit/tools/dt-utils/tree/src/dtblint-imx-pinmux.c
> 
> 
> --
> Pengutronix e.K.                           | Uwe Kleine-König
> |
> Industrial Linux Solutions                 | https://www.pengutronix.de/
> |