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Date: Sat, 8 Jun 2024 18:02:27 +0300
From: Laurent Pinchart <laurent.pinchart@...asonboard.com>
To: Christopher Obbard <chris.obbard@...labora.com>
Cc: Kieran Bingham <kieran.bingham@...asonboard.com>,
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
On Mon, Apr 15, 2024 at 06:07:24PM +0100, Christopher Obbard wrote:
> 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:
> > > 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).
I'd like to get this merged in v6.11. If you don't have time to send a
v2, I'm happy resending our version of the patch instead :-)
> > > > pinctrl_i2c1: i2c1grp {
> > > > fsl,pins = <
> > > >
> > > > MX8MP_IOMUXC_I2C1_SCL__I2C1_SCL
> > > > 0x400001c2
--
Regards,
Laurent Pinchart
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