linux-kernel - Re: [PATCH 1/3] ARM: dts: sun8i: Add basic dtsi file for Allwinner R40

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Date:   Thu, 24 Aug 2017 08:07:09 +0200
From:   Maxime Ripard <maxime.ripard@...e-electrons.com>
To:     icenowy@...c.io
Cc:     Chen-Yu Tsai <wens@...e.org>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-sunxi@...glegroups.com
Subject: Re: [PATCH 1/3] ARM: dts: sun8i: Add basic dtsi file for Allwinner
 R40

On Wed, Aug 23, 2017 at 11:13:04PM +0800, icenowy@...c.io wrote:
> 在 2017-08-23 22:35，Maxime Ripard 写道：
> > On Wed, Aug 23, 2017 at 07:56:29PM +0800, icenowy@...c.io wrote:
> > > > > +			reg = <0x01c0f000 0x1000>;
> > > > > +			clocks = <&ccu CLK_BUS_MMC0>, <&ccu CLK_MMC0>;
> > > > > +			clock-names = "ahb", "mmc";
> > > > > +			resets = <&ccu RST_BUS_MMC0>;
> > > > > +			reset-names = "ahb";
> > > > > +			pinctrl-0 = <&mmc0_pins>;
> > > > > +			pinctrl-names = "default";
> > > > > +			interrupts = <GIC_SPI 32 IRQ_TYPE_LEVEL_HIGH>;
> > > > > +			max-frequency = <150000000>;
> > > >
> > > > have you tested that frequency?
> > > 
> > > I think the frequency should be kept here, although my cards cannot
> > > reach this frequency.
> > > 
> > > The numbers are same as the corresponding controllers in A64.
> > > 
> > > Maybe I should add a comment saying it's educated guess?
> > 
> > I'd rather have it tested by someone, and then add the proper
> > frequencies. It took quite a while to figure out how these modes were
> > supposed to be working on the A64, so it's not obvious that they're
> > just going to work.
> 
> Should I add my results here?
> 
> MMC0: 25MHz
> MMC1: 50MHz
> MMC2: 52MHz
> MMC3: not wired :-(
> 
> I think it's conservative enough and works well ;-)

And that's my point. You didn't test HS200, SDR50 or SDR104 for
example. So you have no idea whether the frequencies from 50MHz to
150MHz are actually working or not.

> 
> > 
> > > > > +		gic: interrupt-controller@...1000 {
> > > > > +			compatible = "arm,gic-400";
> > > > > +			reg = <0x01c81000 0x1000>,
> > > > > +			      <0x01c82000 0x1000>,
> > > > > +			      <0x01c84000 0x2000>,
> > > > > +			      <0x01c86000 0x2000>;
> > > > > +			interrupt-controller;
> > > > > +			#interrupt-cells = <3>;
> > > > > +			interrupts = <GIC_PPI 9 (GIC_CPU_MASK_SIMPLE(4) |
> > > > > IRQ_TYPE_LEVEL_HIGH)>;
> > > > > +		};
> > > > > +	};
> > > > > +
> > > > > +	timer {
> > > > > +		compatible = "arm,armv7-timer";
> > > > > +		interrupts = <GIC_PPI 13 (GIC_CPU_MASK_SIMPLE(4) |
> > > > > IRQ_TYPE_LEVEL_LOW)>,
> > > > > +			     <GIC_PPI 14 (GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_LOW)>,
> > > > > +			     <GIC_PPI 11 (GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_LOW)>,
> > > > > +			     <GIC_PPI 10 (GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_LOW)>;
> > > >
> > > > Those masks are wrong.
> > > 
> > > I compared it with other sun8i SoCs' device tree.
> > > 
> > > Where's wrong?
> > 
> > It's supposed to be a mask of the CPUs in your system. Since you just
> > have one of them, it shouldn't be 4.
> 
> R40 has 4 cores...
> 
> Or I didn't understand this?

Gah, sorry, I mistook this for the V3s for some reason...

Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

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