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Message-ID: <525f3c7f7f6613c78ac364c9ce0234cca5e1c710.camel@collabora.com>
Date: Mon, 15 Apr 2024 18:07:24 +0100
From: Christopher Obbard <chris.obbard@...labora.com>
To: Laurent Pinchart <laurent.pinchart@...asonboard.com>, Kieran Bingham
<kieran.bingham@...asonboard.com>
Cc: linux-kernel@...r.kernel.org, Daniel Scally
<dan.scally@...asonboard.com>, kernel@...labora.com, Conor Dooley
<conor+dt@...nel.org>, Fabio Estevam <festevam@...il.com>, Krzysztof
Kozlowski <krzk+dt@...nel.org>, Pengutronix Kernel Team
<kernel@...gutronix.de>, Rob Herring <robh@...nel.org>, Sascha Hauer
<s.hauer@...gutronix.de>, Shawn Guo <shawnguo@...nel.org>,
devicetree@...r.kernel.org, imx@...ts.linux.dev,
linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v1 1/1] arm64: dts: imx8mp-debix-model-a: Add HDMI
output support
Hi Laurent,
On Mon, 2024-04-15 at 19:35 +0300, Laurent Pinchart wrote:
> On Mon, Apr 15, 2024 at 04:08:10PM +0100, Kieran Bingham wrote:
> > Hi Chris,
> >
> >
> > Quoting Christopher Obbard (2024-04-15 12:41:27)
> > > Enable the HDMI output on the Debix Model A SBC, using the HDMI encoder
> > > present in the i.MX8MP SoC.
> >
> > Aha, you beat me to it. I have a commit locally (Dated 2022-09-06) but
> > not sent because I didn't realise the HDMI support finally got upstream
> > \o/
> >
> > > Signed-off-by: Christopher Obbard <chris.obbard@...labora.com>
> > > ---
> > >
> > > .../dts/freescale/imx8mp-debix-model-a.dts | 47 +++++++++++++++++++
> > > 1 file changed, 47 insertions(+)
> > >
> > > diff --git a/arch/arm64/boot/dts/freescale/imx8mp-debix-model-a.dts
> > > b/arch/arm64/boot/dts/freescale/imx8mp-debix-model-a.dts
> > > index 2c19766ebf09..29529c2ecac9 100644
> > > --- a/arch/arm64/boot/dts/freescale/imx8mp-debix-model-a.dts
> > > +++ b/arch/arm64/boot/dts/freescale/imx8mp-debix-model-a.dts
> > > @@ -20,6 +20,18 @@ chosen {
> > > stdout-path = &uart2;
> > > };
> > >
> > > + hdmi-connector {
> > > + compatible = "hdmi-connector";
> > > + label = "hdmi";
> > > + type = "a";
> > > +
> > > + port {
> > > + hdmi_connector_in: endpoint {
> > > + remote-endpoint = <&hdmi_tx_out>;
> > > + };
> > > + };
> > > + };
> > > +
> >
> > Interesting. My patch missed this. But it looks correct.
> >
> > > leds {
> > > compatible = "gpio-leds";
> > > pinctrl-names = "default";
> > > @@ -94,6 +106,28 @@ ethphy0: ethernet-phy@0 { /* RTL8211E */
> > > };
> > > };
> > >
> > > +&hdmi_pvi {
> > > + status = "okay";
> > > +};
> > > +
> > > +&hdmi_tx {
> > > + pinctrl-names = "default";
> > > + pinctrl-0 = <&pinctrl_hdmi>;
> > > + status = "okay";
> > > +
> > > + ports {
> > > + port@1 {
> > > + hdmi_tx_out: endpoint {
> > > + remote-endpoint = <&hdmi_connector_in>;
> > > + };
> > > + };
> > > + };
> > > +};
> > > +
> > > +&hdmi_tx_phy {
> > > + status = "okay";
> > > +};
> > > +
> > > &i2c1 {
> > > clock-frequency = <400000>;
> > > pinctrl-names = "default";
> > > @@ -241,6 +275,10 @@ &i2c6 {
> > > status = "okay";
> > > };
> > >
> > > +&lcdif3 {
> > > + status = "okay";
> > > +};
> > > +
> >
> > Except for the addition of the connector, the above matches my patch to
> > here.
> >
> > > &snvs_pwrkey {
> > > status = "okay";
> > > };
> >
> > But in my patch I have the following hunk here: (I haven't checked to
> > see if this still applies on mainline, so take with a pinch of salt if
> > it's not there!)
> >
> >
> > &iomuxc {
> > pinctrl-names = "default";
> > - pinctrl-0 = <&pinctrl_hog>;
> > -
> > - pinctrl_hog: hoggrp {
> > - fsl,pins = <
> > -
> > MX8MP_IOMUXC_HDMI_DDC_SCL__HDMIMIX_HDMI_SCL 0x400001c3
> > -
> > MX8MP_IOMUXC_HDMI_DDC_SDA__HDMIMIX_HDMI_SDA 0x400001c3
> > -
> > MX8MP_IOMUXC_HDMI_HPD__HDMIMIX_HDMI_HPD 0x40000019
> > -
> > MX8MP_IOMUXC_HDMI_CEC__HDMIMIX_HDMI_CEC 0x40000019
> > - >;
> > - };
> >
> > pinctrl_eqos: eqosgrp {
> > fsl,pins = <
> > MX8MP_IOMUXC_ENET_MDC__ENET_QOS_MDC
> > 0x3
> > MX8MP_IOMUXC_ENET_MDIO__ENET_QOS_MDIO
> > 0x3
> >
> >
> > > @@ -358,6 +396,15 @@
> > > MX8MP_IOMUXC_NAND_READY_B__GPIO3_IO16 0x19
> > > >;
> > > };
> > >
> > > + pinctrl_hdmi: hdmigrp {
> > > + fsl,pins = <
> > > +
> > > MX8MP_IOMUXC_HDMI_DDC_SCL__HDMIMIX_HDMI_SCL
> > > 0x400001c3
> > > +
> > > MX8MP_IOMUXC_HDMI_DDC_SDA__HDMIMIX_HDMI_SDA
> > > 0x400001c3
> > > +
> > > MX8MP_IOMUXC_HDMI_HPD__HDMIMIX_HDMI_HPD
> > > 0x40000019
> > > +
> > > MX8MP_IOMUXC_HDMI_CEC__HDMIMIX_HDMI_CEC
> > > 0x40000019
> > > + >;
> > > + };
> > > +
> >
> > And my addition here is :
> >
> >
> > + pinctrl_hdmi: hdmigrp {
> > + fsl,pins = <
> > + MX8MP_IOMUXC_HDMI_DDC_SCL__HDMIMIX_HDMI_SCL 0
> > x1c3
> > + MX8MP_IOMUXC_HDMI_DDC_SDA__HDMIMIX_HDMI_SDA 0
> > x1c3
> > + MX8MP_IOMUXC_HDMI_HPD__HDMIMIX_HDMI_HPD
> > 0x19
> > + MX8MP_IOMUXC_HDMI_CEC__HDMIMIX_HDMI_CEC
> > 0x19
> > + >;
> > + };
> > +
> >
> >
> > I haven't looked into what the 0x40000000 does yet, but just
> > highlighting the difference from the version I've been using to make use
> > of HDMI so far.
> >
> > Does anyone else know the impact here? Otherwise I'll try to find time
> > to check this later. (For some undefined term of later...)
>
> In drivers/pinctrl/freescale/pinctrl-imx.c,
>
> #define IMX_NO_PAD_CTL 0x80000000 /* no pin config need */
> #define IMX_PAD_SION 0x40000000 /* set SION */
>
> The SION (Software Input ON) bit forces the input path active for the
> pin. This can be used, for instance, to capture through GPIO the value
> of a pin driven by a module. I'm not sure that's needed here.
Thanks for the explanation, makes perfect sense. I will send a v2 without the
SION bit set (e.g exactly per the hunk in Kieran's patch).
Chris
>
> > > pinctrl_i2c1: i2c1grp {
> > > fsl,pins = <
> > >
> > > MX8MP_IOMUXC_I2C1_SCL__I2C1_SCL
> > > 0x400001c2
>
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