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

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Date:   Wed, 23 Aug 2017 23:13:04 +0800
From:   icenowy@...c.io
To:     Maxime Ripard <maxime.ripard@...e-electrons.com>
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

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 ;-)

> 
>> > > +		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?

> 
> Maxime