linux-kernel - Re: [PATCH v2 2/2] arm64: dts: qcom: db845c: Enable gpi

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Date:   Wed, 2 Dec 2020 09:55:48 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     linux-arm-msm@...r.kernel.org, Andy Gross <agross@...nel.org>,
        Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/2] arm64: dts: qcom: db845c: Enable gpi_dma0 node

On 01-12-20, 19:06, Bjorn Andersson wrote:
> On Mon 30 Nov 22:25 CST 2020, Vinod Koul wrote:
> 
> > gpi_dma0 can be used for spi and i2c transfers on db845c, so enable it
> > 
> > Signed-off-by: Vinod Koul <vkoul@...nel.org>
> > ---
> >  arch/arm64/boot/dts/qcom/sdm845-db845c.dts | 4 ++++
> >  1 file changed, 4 insertions(+)
> > 
> > diff --git a/arch/arm64/boot/dts/qcom/sdm845-db845c.dts b/arch/arm64/boot/dts/qcom/sdm845-db845c.dts
> > index 7cc236575ee2..0653468f26ce 100644
> > --- a/arch/arm64/boot/dts/qcom/sdm845-db845c.dts
> > +++ b/arch/arm64/boot/dts/qcom/sdm845-db845c.dts
> > @@ -418,6 +418,10 @@ &gcc {
> >  			   <GCC_QSPI_CNOC_PERIPH_AHB_CLK>;
> >  };
> >  
> > +&gpi_dma0 {
> > +	status = "okay";
> > +};
> > +
> 
> But you're only enabling the gpi, you don't have anything wired to it,
> so why enable it?
> 
> I took a look downstream and they have all the i2c and spi nodes with
> their dmas filled out - and the two gpis enabled at all times
> (sdm845.dtsi). Can/should we do the same?

So dma is merged and in linux-next but support for spi/i2c is not as
that is dependent upon dmaengine interface introduced for this.

I was planning to post spi/i2c after rc1 and also the dts enabling them

-- 
~Vinod