Re: [PATCH v3 09/12] arm64: dts: rp1: Add support for RaspberryPi's RP1 device

Andrea della Porta
2024-11-05T14:31:14Z

Hi Stan,

On 15:29 Mon 04 Nov , Stanimir Varbanov wrote:
> Hi Andrea,
>
> On 10/28/24 16:07, Andrea della Porta wrote:
> > RaspberryPi RP1 is a multi function PCI endpoint device that
> > exposes several subperipherals via PCI BAR.
> > Add a dtb overlay that will be compiled into a binary blob
> > and linked in the RP1 driver.
> > This overlay offers just minimal support to represent the
> > RP1 device itself, the sub-peripherals will be added by
> > future patches.
> >
> > Signed-off-by: Andrea della Porta <andrea.porta@suse.com>
> > ---
> > NOTE: this patch should be taken by the same maintainer that will take
> > "[PATCH v3 10/12] misc: rp1: RaspberryPi RP1 misc driver", since they
> > are closely related in terms of compiling.
> >
> > MAINTAINERS | 1 +
> > arch/arm64/boot/dts/broadcom/rp1.dtso | 61 +++++++++++++++++++++++++++
> > 2 files changed, 62 insertions(+)
> > create mode 100644 arch/arm64/boot/dts/broadcom/rp1.dtso
> >
> > diff --git a/MAINTAINERS b/MAINTAINERS
> > index 06277969a522..510a071ede78 100644
> > --- a/MAINTAINERS
> > +++ b/MAINTAINERS
> > @@ -19383,6 +19383,7 @@ F: include/uapi/linux/media/raspberrypi/
> > RASPBERRY PI RP1 PCI DRIVER
> > M: Andrea della Porta <andrea.porta@suse.com>
> > S: Maintained
> > +F: arch/arm64/boot/dts/broadcom/rp1.dtso
> > F: Documentation/devicetree/bindings/clock/raspberrypi,rp1-clocks.yaml
> > F: Documentation/devicetree/bindings/misc/pci1de4,1.yaml
> > F: Documentation/devicetree/bindings/pci/pci-ep-bus.yaml
> > diff --git a/arch/arm64/boot/dts/broadcom/rp1.dtso b/arch/arm64/boot/dts/broadcom/rp1.dtso
> > new file mode 100644
> > index 000000000000..8d1bbf207a30
> > --- /dev/null
> > +++ b/arch/arm64/boot/dts/broadcom/rp1.dtso
> > @@ -0,0 +1,61 @@
> > +// SPDX-License-Identifier: (GPL-2.0 OR MIT)
> > +
> > +#include <dt-bindings/gpio/gpio.h>
> > +#include <dt-bindings/interrupt-controller/irq.h>
> > +#include <dt-bindings/clock/raspberrypi,rp1-clocks.h>
> > +
> > +/dts-v1/;
> > +/plugin/;
> > +
> > +/ {
> > + fragment@0 {
> > + target-path="";
> > + __overlay__ {
> > + compatible = "pci1de4,1";
> > + #address-cells = <3>;
> > + #size-cells = <2>;
> > + interrupt-controller;
> > + #interrupt-cells = <2>;
> > +
> > + pci_ep_bus: pci-ep-bus@1 {
> > + compatible = "simple-bus";
> > + ranges = <0xc0 0x40000000
> > + 0x01 0x00 0x00000000
> > + 0x00 0x00400000>;
> > + dma-ranges = <0x10 0x00000000
> > + 0x43000000 0x10 0x00000000
> > + 0x10 0x00000000>;
> > + #address-cells = <2>;
> > + #size-cells = <2>;
> > +
> > + rp1_clocks: clocks@c040018000 {
> > + compatible = "raspberrypi,rp1-clocks";
> > + reg = <0xc0 0x40018000 0x0 0x10038>;
>
> shouldn't this be:
>
> rp1_clocks: clocks@18000 {
> reg = <0x00 0x00018000 0x0 0x10038>;
> ...
> }
>
> ?
>
> And for other nodes too...

For that to be @18000 instead of @c040018000, you should also change
the "ranges" entry in pci-ep-bus node, as follows:

ranges = <0x00 0x00018000 //This was: 0xc0 0x40000000
0x01 0x00 0x00000000
0x00 0x00400000>;

which is of course feasible, but I prefer to use addresses that
resemble (at least to some extent) the ones in RP1 docs.

Many thanks,
Andrea

>
> ~Stan
>
> > + #clock-cells = <1>;
> > + clocks = <&clk_rp1_xosc>;
> > + clock-names = "xosc";
> > + assigned-clocks = <&rp1_clocks RP1_PLL_SYS_CORE>,
> > + <&rp1_clocks RP1_PLL_SYS>,
> > + <&rp1_clocks RP1_CLK_SYS>;
> > + assigned-clock-rates = <1000000000>, // RP1_PLL_SYS_CORE
> > + <200000000>, // RP1_PLL_SYS
> > + <200000000>; // RP1_CLK_SYS
> > + };
> > +
> > + rp1_gpio: pinctrl@c0400d0000 {
> > + compatible = "raspberrypi,rp1-gpio";
> > + reg = <0xc0 0x400d0000 0x0 0xc000>,
> > + <0xc0 0x400e0000 0x0 0xc000>,
> > + <0xc0 0x400f0000 0x0 0xc000>;
> > + gpio-controller;
> > + #gpio-cells = <2>;
> > + interrupt-controller;
> > + #interrupt-cells = <2>;
> > + interrupts = <0 IRQ_TYPE_LEVEL_HIGH>,
> > + <1 IRQ_TYPE_LEVEL_HIGH>,
> > + <2 IRQ_TYPE_LEVEL_HIGH>;
> > + };
> > + };
> > + };
> > + };
> > +};
>