Re: [Qemu-riscv] [PATCH] hw/riscv/virt: re-add machine-specific compatible string to /soc/ node

["Auer, Lukas" <lukas.auer@aisec.fraunhofer.de>]

On Tue, 2019-03-19 at 05:19 -0700, Palmer Dabbelt wrote:
> On Sun, 10 Feb 2019 12:17:26 PST (-0800), 
> lukas.auer@aisec.fraunhofer.de wrote:
> > Re-add the previous compatible string "riscv-virtio-soc" to the soc
> > device tree node to allow U-Boot and Linux to bind machine-specific
> > drivers to it. The current compatible string "simple-bus" is
> > retained.
> > 
> > This is required by U-Boot to bind devices early, as part of the
> > pre-relocation driver model.
> > 
> > Fixes: 53f54508dae6("hw/riscv/virtio: Set the soc device tree node
> > as a
> > simple-bus")
> > Signed-off-by: Lukas Auer <lukas.auer@aisec.fraunhofer.de>
> 
> I still had this at the top of my patch queue, but from looking at
> the thread 
> it appears the resolution here is to drop this in favor of generic
> support.  
> LMK if I missed something.

Yes, you are right. We are going to fix this from the U-Boot side, so
this patch can be dropped.

Thanks,
Lukas

> 
> > ---
> > 
> >  hw/riscv/virt.c | 3 ++-
> >  1 file changed, 2 insertions(+), 1 deletion(-)
> > 
> > diff --git a/hw/riscv/virt.c b/hw/riscv/virt.c
> > index 3e8b19c668..c53bb905ff 100644
> > --- a/hw/riscv/virt.c
> > +++ b/hw/riscv/virt.c
> > @@ -157,6 +157,7 @@ static void *create_fdt(RISCVVirtState *s,
> > const struct MemmapEntry *memmap,
> >      char *nodename;
> >      uint32_t plic_phandle, phandle = 1;
> >      int i;
> > +    const char soc_compat[] = "riscv-virtio-soc\0simple-bus";
> > 
> >      fdt = s->fdt = create_device_tree(&s->fdt_size);
> >      if (!fdt) {
> > @@ -171,7 +172,7 @@ static void *create_fdt(RISCVVirtState *s,
> > const struct MemmapEntry *memmap,
> > 
> >      qemu_fdt_add_subnode(fdt, "/soc");
> >      qemu_fdt_setprop(fdt, "/soc", "ranges", NULL, 0);
> > -    qemu_fdt_setprop_string(fdt, "/soc", "compatible", "simple-
> > bus");
> > +    qemu_fdt_setprop(fdt, "/soc", "compatible", soc_compat,
> > sizeof(soc_compat));
> >      qemu_fdt_setprop_cell(fdt, "/soc", "#size-cells", 0x2);
> >      qemu_fdt_setprop_cell(fdt, "/soc", "#address-cells", 0x2);