[PATCH 4/4] arm64: dts: imx8mp-evk: enable HDMI

[Laurent Pinchart]

On Thu, May 25, 2023 at 12:26:28PM +0200, Luca Ceresoli wrote:
> On Thu, 2 Mar 2023 16:35:25 +0100 Luca Ceresoli wrote:
> > On Fri, 26 Aug 2022 21:29:32 +0200 Lucas Stach wrote:
> > 
> > > Enable the DT nodes for HDMI TX and PHY and add the pinctrl for the few
> > > involved pins that are configurable.
> > > 
> > > Signed-off-by: Lucas Stach <l.stach at pengutronix.de>  
> 
> Any updates to these patches? I haven't found any v2 on the list.

This is the last patch in the series that hasn't made it upstream It
would be really nice to get a new version that could be merged in v6.11.
Pretty please :-)

> > I'm joining late to this party... Is this the latest version of this
> > series? I haven't found any more recent, but if it is not the case
> > would you point me to the most recent one please?
> > 
> > > +	pinctrl_hdmi: hdmigrp {
> > > +		fsl,pins = <
> > > +			MX8MP_IOMUXC_HDMI_DDC_SCL__HDMIMIX_HDMI_SCL	0x1c3
> > > +			MX8MP_IOMUXC_HDMI_DDC_SDA__HDMIMIX_HDMI_SDA	0x1c3  
> > 
> > Is the low nibble (0x3) right?BIT(0) is reserved according too the
> > reference manual.
> > 
> > Also, all the non-reserved bits in that nibble are bits 1 and 2, which
> > set the drive strength. For an I2C line it seems that the minimum drive
> > strength (0x0) should be enough for an I2C line: with any drive
> > strength setting the supported frequency is >= 65 MHz.
> > 
> > > +			MX8MP_IOMUXC_HDMI_HPD__HDMIMIX_HDMI_HPD		0x19
> > > +			MX8MP_IOMUXC_HDMI_CEC__HDMIMIX_HDMI_CEC		0x19  
> > 
> > Here as well, bits 0 and 3 are reserved.
> 
> About these pinctrls, I am using these settings on the MSC SM2-MB-EP1
> board and they appear to be working just as those you are using (but I
> haven't tested CEC):
> 
>   MX8MP_IOMUXC_HDMI_DDC_SCL__HDMIMIX_HDMI_SCL     0x1c2
>   MX8MP_IOMUXC_HDMI_DDC_SDA__HDMIMIX_HDMI_SDA     0x1c2
>   MX8MP_IOMUXC_HDMI_CEC__HDMIMIX_HDMI_CEC         0x10
>   MX8MP_IOMUXC_HDMI_HPD__HDMIMIX_HDMI_HPD         0x10

-- 
Regards,

Laurent Pinchart