Hi Geert-san, Kieran-san,
> -----Original Message-----
> From: Kieran Bingham
> Sent: Monday, October 2, 2017 5:45 PM
>
> Hi Geert, Shimoda-san,
>
> On 02/10/17 09:20, Geert Uytterhoeven wrote:
> > Hi Shimoda-san,
> >
> > On Mon, Oct 2, 2017 at 8:29 AM, Yoshihiro Shimoda
> > <yoshihiro.shimoda.uh@xxxxxxxxxxx> wrote:
> >> This patch enables the USB2.0 phy channel 3. R-Car H3 ES2.0 has
> >> this channel and we can use it on the Salvator-XS.
> >>
> >> Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>
> >
> > Reviewed-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
> >
> >> --- a/arch/arm64/boot/dts/renesas/r8a7795-salvator-xs.dts
> >> +++ b/arch/arm64/boot/dts/renesas/r8a7795-salvator-xs.dts
> >> @@ -99,6 +99,11 @@
> >> groups = "usb2";
> >> function = "usb2";
> >> };
> >> +
> >> + usb2_ch3_pins: usb2_ch3 {
> >> + groups = "usb2_ch3";
> >> + function = "usb2_ch3";
> >> + };
> >> };
> >
> > Using these pins requires changing SW31, disabling the interrupt capabilities
> > of the ADV7482? Does the ADV7482 still work after that?
Oops, I missed the usb2.0 pins are connected to ADV7482's interruption pins.
But,
> The ADV7482 is currently working without interrupts at the moment. However, I do
> have hotplug and interrupt handling on my todo list, and infact I have already
> started a patch adding interrupt support.
>
>
> The DT currently specifies the following interrupts for the ADV7482,
>
> + video-receiver@70 {
> + compatible = "adi,adv7482";
> + interrupt-parent = <&gpio6>;
> + interrupt-names = "intrq1", "intrq2";
> + interrupts = <30 IRQ_TYPE_LEVEL_LOW>,
> + <31 IRQ_TYPE_LEVEL_LOW>;
It seems Kieran-san is using non-conflict pins with usb2.0 ch3 :)
According to the board datasheet, GP6_30 and GP6_31 are initial setting for ADV7482 and
it doesn't conflict with USB 2.0 ch3 (USB2.0 ch3 pins are GP6_04 and GP6_21).
So, I think we can use both usb 2.0 ch3 and ADV7482 if we don't change the SW31 from initial setting.
However, to avoid any trouble, should we explain this SW31 setting in the dts file?
Best regards,
Yoshihiro Shimoda
> And the start of interrupt handling looks like: (this is not integrated, nor
> finished):
>
> https://git.kernel.org/pub/scm/linux/kernel/git/kbingham/rcar.git/commit/?h=adv748x/dev&id=82c7d0100edd28fa429c3811c
> 575bad7a4d92cfd
>
> This purely registers the interrupts currently; so if I need to do anything
> differently to handle the USB2 conflict, please let me know.
> As for going forwards, I believe that the ADV7482 can actually configure what
> interrupts are triggered on either interrupt source, (INTRQ1/INTRQ2) and
> therefore we could potentially get by with only INTRQ1, (INT 30) if we needed
> to; however it would be good to handle this conflict in a generic way.
>
>
> Regards
>
> Kieran
>
> > Gr{oetje,eeting}s,
> >
> > Geert
> >
> > --
> > Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx
> >
> > In personal conversations with technical people, I call myself a hacker. But
> > when I'm talking to journalists I just say "programmer" or something like that.
> > -- Linus Torvalds
> >
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