linux-kernel - Re: [PATCH 3/3] arm: dts: mt2701: Add display subsystem related nodes for MT2701

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Message-ID: <1496996562.2343.3.camel@pengutronix.de>
Date:   Fri, 09 Jun 2017 10:22:42 +0200
From:   Philipp Zabel <p.zabel@...gutronix.de>
To:     Matthias Brugger <matthias.bgg@...il.com>
Cc:     Erin Lo <erin.lo@...iatek.com>, srv_heupstream@...iatek.com,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-mediatek@...ts.infradead.org,
        YT Shen <yt.shen@...iatek.com>
Subject: Re: [PATCH 3/3] arm: dts: mt2701: Add display subsystem related
 nodes for MT2701

Hi Matthias,

On Fri, 2017-06-09 at 10:14 +0200, Matthias Brugger wrote:
> 
> On 01/06/17 08:08, Erin Lo wrote:
> > From: YT Shen <yt.shen@...iatek.com>
> > 
> > This patch adds the device nodes for the DISP function blocks for MT2701
> > 
> > Signed-off-by: YT Shen <yt.shen@...iatek.com>
> > Signed-off-by: Erin Lo <erin.lo@...iatek.com>
> > ---
> >   arch/arm/boot/dts/mt2701.dtsi | 84 +++++++++++++++++++++++++++++++++++++++++++
> >   1 file changed, 84 insertions(+)
> > 
> > diff --git a/arch/arm/boot/dts/mt2701.dtsi b/arch/arm/boot/dts/mt2701.dtsi
> > index 4f110d5..e20b65c 100644
> > --- a/arch/arm/boot/dts/mt2701.dtsi
> > +++ b/arch/arm/boot/dts/mt2701.dtsi
> > @@ -17,6 +17,7 @@
> >   #include <dt-bindings/interrupt-controller/irq.h>
> >   #include <dt-bindings/interrupt-controller/arm-gic.h>
> >   #include <dt-bindings/reset/mt2701-resets.h>
> > +#include <dt-bindings/memory/mt2701-larb-port.h>
> >   #include "skeleton64.dtsi"
> >   #include "mt2701-pinfunc.h"
> >   
> > @@ -24,6 +25,11 @@
> >   	compatible = "mediatek,mt2701";
> >   	interrupt-parent = <&sysirq>;
> >   
> > +	aliases {
> > +		rdma0 = &rdma0;
> > +		rdma1 = &rdma1;
> > +	};
> > +
> 
> I know we have this alias in mt8173.dtsi, but I don't understand what 
> they are for. Do you know?

The mtk_disp_rdma platform driver uses mtk_ddp_comp_get_id() to identify
the specific RDMA instance, which calls of_alias_get_id(). The core code
needs to know which RDMA is which to correctly set up the display data
paths.

regards
Philipp