linux-kernel - Re: [PATCH 4/4] ARM: dts: sun7i: Use syscon-based implementation for gmac

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Message-ID: <20200420132331.GB18522@plaes.org>
Date:   Mon, 20 Apr 2020 13:23:31 +0000
From:   Priit Laes <plaes@...es.org>
To:     Maxime Ripard <maxime@...no.tech>
Cc:     Chen-Yu Tsai <wens@...e.org>, Rob Herring <robh+dt@...nel.org>,
        linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-sunxi@...glegroups.com
Subject: Re: [PATCH 4/4] ARM: dts: sun7i: Use syscon-based implementation for
 gmac

On Mon, Apr 20, 2020 at 02:59:19PM +0200, Maxime Ripard wrote:
> On Sat, Apr 18, 2020 at 01:17:30AM +0300, Priit Laes wrote:
> > Use syscon-based approach to access gmac clock configuration
> > register, instead of relying on a custom clock driver.
> > 
> > As a bonus, we can now drop the custom clock implementation
> > and dummy clocks making sun7i fully CCU-compatible.
> > 
> > Signed-off-by: Priit Laes <plaes@...es.org>
> > ---
> >  arch/arm/boot/dts/sun7i-a20.dtsi | 36 +++-----------------------------
> >  1 file changed, 3 insertions(+), 33 deletions(-)
> > 
> > diff --git a/arch/arm/boot/dts/sun7i-a20.dtsi b/arch/arm/boot/dts/sun7i-a20.dtsi
> > index ffe1d10a1a84..750962a94fad 100644
> > --- a/arch/arm/boot/dts/sun7i-a20.dtsi
> > +++ b/arch/arm/boot/dts/sun7i-a20.dtsi
> > @@ -219,37 +219,6 @@ osc32k: clk-32k {
> >  			clock-frequency = <32768>;
> >  			clock-output-names = "osc32k";
> >  		};
> > -
> > -		/*
> > -		 * The following two are dummy clocks, placeholders
> > -		 * used in the gmac_tx clock. The gmac driver will
> > -		 * choose one parent depending on the PHY interface
> > -		 * mode, using clk_set_rate auto-reparenting.
> > -		 *
> > -		 * The actual TX clock rate is not controlled by the
> > -		 * gmac_tx clock.
> > -		 */
> > -		mii_phy_tx_clk: clk-mii-phy-tx {
> > -			#clock-cells = <0>;
> > -			compatible = "fixed-clock";
> > -			clock-frequency = <25000000>;
> > -			clock-output-names = "mii_phy_tx";
> > -		};
> > -
> > -		gmac_int_tx_clk: clk-gmac-int-tx {
> > -			#clock-cells = <0>;
> > -			compatible = "fixed-clock";
> > -			clock-frequency = <125000000>;
> > -			clock-output-names = "gmac_int_tx";
> > -		};
> > -
> > -		gmac_tx_clk: clk@...0164 {
> > -			#clock-cells = <0>;
> > -			compatible = "allwinner,sun7i-a20-gmac-clk";
> > -			reg = <0x01c20164 0x4>;
> > -			clocks = <&mii_phy_tx_clk>, <&gmac_int_tx_clk>;
> > -			clock-output-names = "gmac_tx";
> > -		};
> >  	};
> >  
> >  
> > @@ -1511,11 +1480,12 @@ mali: gpu@...0000 {
> >  
> >  		gmac: ethernet@...0000 {
> >  			compatible = "allwinner,sun7i-a20-gmac";
> > +			syscon = <&ccu>;
> >  			reg = <0x01c50000 0x10000>;
> >  			interrupts = <GIC_SPI 85 IRQ_TYPE_LEVEL_HIGH>;
> >  			interrupt-names = "macirq";
> > -			clocks = <&ccu CLK_AHB_GMAC>, <&gmac_tx_clk>;
> > -			clock-names = "stmmaceth", "allwinner_gmac_tx";
> > +			clocks = <&ccu CLK_AHB_GMAC>;
> > +			clock-names = "stmmaceth";
> 
> I guess you also need to update the binding so that it considers it valid?

Yes, will do it in the next round.

> 
> Maxime