linux-kernel - Re: [PATCH 09/21] arm64: dts: allwinner: a64: Add HDMI support

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Date:   Mon, 14 May 2018 16:01:15 +0530
From:   Jagan Teki <jagan@...rulasolutions.com>
To:     Maxime Ripard <maxime.ripard@...tlin.com>
Cc:     Chen-Yu Tsai <wens@...e.org>, Icenowy Zheng <icenowy@...c.io>,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        David Airlie <airlied@...ux.ie>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        linux-clk <linux-clk@...r.kernel.org>,
        Michael Trimarchi <michael@...rulasolutions.com>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        devicetree <devicetree@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-sunxi <linux-sunxi@...glegroups.com>
Subject: Re: [PATCH 09/21] arm64: dts: allwinner: a64: Add HDMI support

On Mon, May 14, 2018 at 2:10 PM, Maxime Ripard
<maxime.ripard@...tlin.com> wrote:
> On Mon, May 14, 2018 at 02:03:36PM +0530, Jagan Teki wrote:
>> On Wed, May 2, 2018 at 5:04 PM, Maxime Ripard <maxime.ripard@...tlin.com> wrote:
>> > Hi,
>> >
>> > On Mon, Apr 30, 2018 at 05:10:46PM +0530, Jagan Teki wrote:
>> >> +             hdmi_phy: hdmi-phy@...0000 {
>> >> +                     compatible = "allwinner,sun50i-a64-hdmi-phy",
>> >> +                                  "allwinner,sun8i-h3-hdmi-phy";
>> >> +                     reg = <0x01ef0000 0x10000>;
>> >> +                     clocks = <&ccu CLK_BUS_HDMI>, <&ccu CLK_HDMI_DDC>,
>> >> +                              <&ccu CLK_PLL_VIDEO1>;
>> >
>> > You were discussing that the PLL0 could also be used to clock the PHY,
>> > has that been figured out?
>>
>> This is what I understand from Fig: 3-3. Module Clock Diagram, both
>> tcon0 and tcon1 are using HDMI. I'm thinking based on the tcon
>> configuration we need use proper PLL or some logic to get common PLL
>> don't know yet. Since this series adding tcon1 I've attached PLL1.
>
> You're not describing the TCON node here though, but the HDMI one, and
> the HDMI block is listed in both the PLL video 0 and 1.

So how can we attach particular PLL with particular HDMI(PLL0 to HDMI0
and so-on) or do we need to attached both the PLL's any suggestion?