Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
MIME-Version: 1.0
References: <20230719160048.2737423-1-james.hilliard1@gmail.com>
 <20230719160048.2737423-2-james.hilliard1@gmail.com> <CAOMZO5C_BFm+P=9uizL0buSJ9a33PM6hNgG5OcZ3B4YxD=h_6w@mail.gmail.com>
 <CADvTj4piksWhua5W6CMr3ZpkRJcFvR=545hsQhW16KL4gQb4pw@mail.gmail.com>
In-Reply-To: <CADvTj4piksWhua5W6CMr3ZpkRJcFvR=545hsQhW16KL4gQb4pw@mail.gmail.com>
From:   Fabio Estevam <festevam@gmail.com>
Date:   Wed, 19 Jul 2023 22:29:27 -0300
Message-ID: <CAOMZO5Cpf1ejTZTzBWhnchMQOJU6hcLot2Ca+78c2h6LWJNTDg@mail.gmail.com>
Subject: Re: [PATCH 2/2] ARM: dts: imx6q: Add Variscite MX6 Custom board support
To:     James Hilliard <james.hilliard1@gmail.com>
Cc:     devicetree@vger.kernel.org,
        Gregory CLEMENT <gregory.clement@bootlin.com>,
        Arnd Bergmann <arnd@arndb.de>, Olof Johansson <olof@lixom.net>,
        soc@kernel.org, Rob Herring <robh+dt@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Conor Dooley <conor+dt@kernel.org>,
        Shawn Guo <shawnguo@kernel.org>,
        Sascha Hauer <s.hauer@pengutronix.de>,
        Pengutronix Kernel Team <kernel@pengutronix.de>,
        NXP Linux Team <linux-imx@nxp.com>,
        linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
Precedence: bulk

On Wed, Jul 19, 2023 at 7:43=E2=80=AFPM James Hilliard
<james.hilliard1@gmail.com> wrote:

> How would I determine what the value of these should be?
>
> The vendor device trees are using 0x80000000 for these values from
> what I can tell.

0x80000000 means "do not touch the pinctrl, use the value from the bootload=
er".

It's preferable not to rely on the value that comes from the
bootloader and explicitly describe the value in the DT.

For the MX6QDL_PAD_DI0_PIN4__IPU1_DI0_PIN04 pin: look at its
IOMUXC_SW_PAD_CTL register in the i.MX6Q Reference Manual.

It is called IOMUXC_SW_PAD_CTL_PAD_DI0_PIN04 and its reset value is 0x1b0b0=
.

So this entry would become:

MX6QDL_PAD_DI0_PIN4__IPU1_DI0_PIN04             0x1b0b0