linux-kernel - Re: [PATCH v2 19/21] arm64: dts: allwinner: Add Allwinner H616 .dtsi file

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Message-ID: <20201214141209.xky5dn42dkrv4vvm@gilmour>
Date:   Mon, 14 Dec 2020 15:12:09 +0100
From:   Maxime Ripard <maxime@...no.tech>
To:     Andre Przywara <andre.przywara@....com>
Cc:     Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        Icenowy Zheng <icenowy@...c.xyz>,
        Linus Walleij <linus.walleij@...aro.org>,
        Rob Herring <robh@...nel.org>,
        Clément Péron <peron.clem@...il.com>,
        Shuosheng Huang <huangshuosheng@...winnertech.com>,
        Yangtao Li <tiny.windzz@...il.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-sunxi@...glegroups.com, devicetree@...r.kernel.org
Subject: Re: [PATCH v2 19/21] arm64: dts: allwinner: Add Allwinner H616 .dtsi
 file

On Mon, Dec 14, 2020 at 12:53:43PM +0000, Andre Przywara wrote:
> On Mon, 14 Dec 2020 10:58:31 +0100
> Maxime Ripard <maxime@...no.tech> wrote:
> > On Fri, Dec 11, 2020 at 01:19:32AM +0000, Andre Przywara wrote:
> > > +	reserved-memory {
> > > +		#address-cells = <2>;
> > > +		#size-cells = <2>;
> > > +		ranges;
> > > +
> > > +		/* 512KiB reserved for ARM Trusted Firmware (BL31)
> > > */
> > > +		secmon_reserved: secmon@...00000 {
> > > +			reg = <0x0 0x40000000 0x0 0x80000>;
> > > +			no-map;
> > > +		};
> > > +	};  
> > 
> > This should still be set by the firmware
> > 
> > > +		mmc0: mmc@...0000 {
> > > +			compatible = "allwinner,sun50i-h616-mmc",
> > > +				     "allwinner,sun50i-a100-mmc";
> > > +			reg = <0x04020000 0x1000>;
> > > +			clocks = <&ccu CLK_BUS_MMC0>, <&ccu
> > > CLK_MMC0>;
> > > +			clock-names = "ahb", "mmc";
> > > +			resets = <&ccu RST_BUS_MMC0>;
> > > +			reset-names = "ahb";
> > > +			interrupts = <GIC_SPI 35
> > > IRQ_TYPE_LEVEL_HIGH>;
> > > +			pinctrl-names = "default";
> > > +			pinctrl-0 = <&mmc0_pins>;
> > > +			status = "disabled";
> > > +			#address-cells = <1>;
> > > +			#size-cells = <0>;
> > > +		};  
> > 
> > Somewhat related: we shouldn't set the MMC speed flags in the drivers.
> > This is biting us on the already supported SoCs, so it would be great
> > to not repeat the same mistake with the new ones
> 
> Do you mean to list the "sd-uhs-sdr50" and friends properties here in
> the DT?
> What is the best practice here in terms putting them in the .dts vs.
> the .dtsi? Surely the controller has limits, but bad traces on a board
> could impose further restrictions, right?
>
> Though that's probably rare, so it sounds like a lot of churn to list
> them in every board DT. So can we list everything in here (.dtsi), then
> delete in those affected boards only?

Yeah, I completely agree :)

Maxime

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