On Mon, Dec 03, 2018 at 09:23:42AM -0800, Atish Patra wrote: > On 12/3/18 8:55 AM, Sudeep Holla wrote: > > On Thu, Nov 29, 2018 at 03:28:18PM -0800, Atish Patra wrote: > > > cpu-map binding can be used to described cpu topology for both > > > RISC-V & ARM. It makes more sense to move the binding to document > > > to a common place. > > > > > > The relevant discussion can be found here. > > > https://lkml.org/lkml/2018/11/6/19 > > > > > > > Looks good to me apart from a minor query below in the example. > > > > Reviewed-by: Sudeep Holla <sudeep.holla@xxxxxxx> > > > > > Signed-off-by: Atish Patra <atish.patra@xxxxxxx> > > > --- > > > .../{arm/topology.txt => cpu/cpu-topology.txt} | 81 ++++++++++++++++++---- > > > 1 file changed, 67 insertions(+), 14 deletions(-) > > > rename Documentation/devicetree/bindings/{arm/topology.txt => cpu/cpu-topology.txt} (86%) > > > > > > diff --git a/Documentation/devicetree/bindings/arm/topology.txt b/Documentation/devicetree/bindings/cpu/cpu-topology.txt > > > similarity index 86% > > > rename from Documentation/devicetree/bindings/arm/topology.txt > > > rename to Documentation/devicetree/bindings/cpu/cpu-topology.txt > > > index 66848355..1de6fbce 100644 > > > --- a/Documentation/devicetree/bindings/arm/topology.txt > > > +++ b/Documentation/devicetree/bindings/cpu/cpu-topology.txt > > > > [...] > > > > > +Example 3: HiFive Unleashed (RISC-V 64 bit, 4 core system) > > > + > > > +cpus { > > > + #address-cells = <2>; > > > + #size-cells = <2>; > > > + compatible = "sifive,fu540g", "sifive,fu500"; > > > + model = "sifive,hifive-unleashed-a00"; > > > + > > > + ... > > > + > > > + cpu-map { > > > + cluster0 { > > > + core0 { > > > + cpu = <&L12>; > > > + }; > > > + core1 { > > > + cpu = <&L15>; > > > + }; > > > + core2 { > > > + cpu0 = <&L18>; > > > + }; > > > + core3 { > > > + cpu0 = <&L21>; > > > + }; > > > + }; > > > + }; > > > + > > > + L12: cpu@1 { > > > + device_type = "cpu"; > > > + compatible = "sifive,rocket0", "riscv"; > > > + reg = <0x1>; > > > + } > > > + > > > + L15: cpu@2 { > > > + device_type = "cpu"; > > > + compatible = "sifive,rocket0", "riscv"; > > > + reg = <0x2>; > > > + } > > > + L18: cpu@3 { > > > + device_type = "cpu"; > > > + compatible = "sifive,rocket0", "riscv"; > > > + reg = <0x3>; > > > + } > > > + L21: cpu@4 { > > > + device_type = "cpu"; > > > + compatible = "sifive,rocket0", "riscv"; > > > + reg = <0x4>; > > > + } > > > +}; > > > > The labels for the CPUs drew my attention. Is it intentionally random > > (or even specific) or just chosen to show anything can be used as labels ? > > SiFive generates the device tree from RTL directly. So I am not sure if they > assign random numbers or a particular algorithm chooses the label. I tried > to put the exact ones that is available publicly. > > https://github.com/riscv/riscv-device-tree-doc/blob/master/examples/sifive-hifive_unleashed-microsemi.dts Oh, that's really terrible. I wouldn't care as this was just source level stuff, but labels are part of the ABI with overlays. Rob
