[PATCH 3/5] arm64: dts: renesas: r8a77995: Add LVDS support

[Ulrich Hecht]

> On August 1, 2018 at 12:35 PM jacopo mondi <jacopo at jmondi.org> wrote:
> 
> 
> Hi Ulrich,
>    I know this series needs to be re-spin when the D3/E3 LVDS PLL
> support will be added, but since I need it for testing on D3 the LVDS
> interface reset support, I noticed a small issue which I thought it is
> worth reporting.
> 
> On Tue, May 15, 2018 at 02:20:38PM +0200, Ulrich Hecht wrote:
> > From: Kieran Bingham <kieran.bingham+renesas at ideasonboard.com>
> >
> > The r8a77995 D3 platform has 2 LVDS channels connected to the DU.
> >
> > Signed-off-by: Kieran Bingham <kieran.bingham+renesas at ideasonboard.com>
> > [uli: moved lvds* into the soc node, added PM domains, resets]
> > Signed-off-by: Ulrich Hecht <ulrich.hecht+renesas at gmail.com>
> > ---
> >  arch/arm64/boot/dts/renesas/r8a77995.dtsi | 56 +++++++++++++++++++++++++++++++
> >  1 file changed, 56 insertions(+)
> >
> > diff --git a/arch/arm64/boot/dts/renesas/r8a77995.dtsi b/arch/arm64/boot/dts/renesas/r8a77995.dtsi
> > index ba98865..8e78110d 100644
> > --- a/arch/arm64/boot/dts/renesas/r8a77995.dtsi
> > +++ b/arch/arm64/boot/dts/renesas/r8a77995.dtsi
> > @@ -757,12 +757,68 @@
> >  				port at 1 {
> >  					reg = <1>;
> >  					du_out_lvds0: endpoint {
> > +						remote-endpoint = <&lvds0_in>;
> >  					};
> >  				};
> >
> >  				port at 2 {
> >  					reg = <2>;
> >  					du_out_lvds1: endpoint {
> > +						remote-endpoint = <&lvds1_in>;
> > +					};
> > +				};
> > +			};
> > +		};
> > +
> > +		lvds0: lvds-encoder at feb90000 {
> > +			compatible = "renesas,r8a77995-lvds";
> > +			reg = <0 0xfeb90000 0 0x20>;
> > +			clocks = <&cpg CPG_MOD 727>;
> > +			power-domains = <&sysc R8A77995_PD_ALWAYS_ON>;
> > +			resets = <&cpg 727>;
> > +			status = "disabled";
> > +
> > +			ports {
> > +				#address-cells = <1>;
> > +				#size-cells = <0>;
> > +
> > +				port at 0 {
> > +					reg = <0>;
> > +					lvds0_in: endpoint {
> > +						remote-endpoint = <&du_out_lvds0>;
> > +					};
> > +				};
> > +
> > +				port at 1 {
> > +					reg = <1>;
> > +					lvds0_out: endpoint {
> > +					};
> > +				};
> > +			};
> > +		};
> > +
> > +		lvds1: lvds-encoder at feb90100 {
> > +			compatible = "renesas,r8a77995-lvds";
> > +			reg = <0 0xfeb90100 0 0x20>;
> > +			clocks = <&cpg CPG_MOD 727>;
> > +			power-domains = <&sysc R8A77995_PD_ALWAYS_ON>;
> > +			resets = <&cpg 727>;
> 
> The LVDS-IF1 CPG reset is SRCR7[26], this I think this should be
> <&cpg 726>
> 
> Please note that the most recent chip manual release has probably an
> error at page 3180, section 37-32
> 
> 5. When display on in the LVDS0-IF, it is necessary to reset (SRCR7[27]) and reset clearing (SRSTCLR7[27])
> LVDS0-IF module.
> When display on in the LVDS1-IF, it is necessary to reset (SRCR7[26]) and reset clearing (SRSTCLR7[26])
> LVDS0-IF module
>     ^- This should probablt be LVDS1-IF
> 

Thanks for the hint, I will keep this in mind.

CU
Uli