lkml.org 
[lkml]   [2017]   [Aug]   [24]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 1/3] ARM: dts: sun8i: Add basic dtsi file for Allwinner R40
On Wed, Aug 23, 2017 at 11:13:04PM +0800, icenowy@aosc.io wrote:
> 在 2017-08-23 22:35,Maxime Ripard 写道:
> > On Wed, Aug 23, 2017 at 07:56:29PM +0800, icenowy@aosc.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@1c81000 {
> > > > > + 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
[unhandled content-type:application/pgp-signature]
\
 
 \ /
  Last update: 2017-08-24 08:07    [W:0.066 / U:21.368 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site