diff mbox series

[v2,14/17] riscv: dts: microchip: add fpga fabric section to icicle kit

Message ID 20211217093325.30612-15-conor.dooley@microchip.com
State New
Headers show
Series Update the Icicle Kit device tree | expand

Commit Message

Conor Dooley Dec. 17, 2021, 9:33 a.m. UTC
From: Conor Dooley <conor.dooley@microchip.com>

Split the device tree for the Microchip MPFS into two sections by adding
microchip-mpfs-fabric.dtsi, which contains peripherals contained in the
FPGA fabric.

Signed-off-by: Conor Dooley <conor.dooley@microchip.com>
---
 .../boot/dts/microchip/microchip-mpfs-fabric.dtsi   | 13 +++++++++++++
 .../dts/microchip/microchip-mpfs-icicle-kit.dts     |  4 ++++
 arch/riscv/boot/dts/microchip/microchip-mpfs.dtsi   |  1 +
 3 files changed, 18 insertions(+)
 create mode 100644 arch/riscv/boot/dts/microchip/microchip-mpfs-fabric.dtsi

Comments

Geert Uytterhoeven Dec. 17, 2021, 4 p.m. UTC | #1
Hi Conor,

On Fri, Dec 17, 2021 at 4:32 PM <Conor.Dooley@microchip.com> wrote:
> On 17/12/2021 13:43, Geert Uytterhoeven wrote:
> > On Fri, Dec 17, 2021 at 10:33 AM <conor.dooley@microchip.com> wrote:
> >> From: Conor Dooley <conor.dooley@microchip.com>
> >>
> >> Split the device tree for the Microchip MPFS into two sections by adding
> >> microchip-mpfs-fabric.dtsi, which contains peripherals contained in the
> >> FPGA fabric.
> >>
> >> Signed-off-by: Conor Dooley <conor.dooley@microchip.com>
> >
> > Thanks for your patch!
> >
> >> --- /dev/null
> >> +++ b/arch/riscv/boot/dts/microchip/microchip-mpfs-fabric.dtsi
> >> @@ -0,0 +1,13 @@
> >> +// SPDX-License-Identifier: (GPL-2.0 OR MIT)
> >> +/* Copyright (c) 2020-2021 Microchip Technology Inc */
> >> +
> >> +/ {
> >> +       corePWM0: pwm@41000000 {
> >> +               compatible = "microchip,corepwm";
> >> +               reg = <0x0 0x41000000 0x0 0xF0>;
> >> +               microchip,sync-update = /bits/ 8 <0>;
> >> +               #pwm-cells = <2>;
> >> +               clocks = <&clkcfg CLK_FIC3>;
> >> +               status = "disabled";
> >> +       };
> >
> > I'm wondering if these should be grouped under a "fabric" subnode,
> > like we have an "soc" subnode for on-SoC devices? Rob?
> >
> > BTW, do you already have a naming plan for different revisions of
> > FPGA fabric cores?
> Not yet (assuming you mean specifically how we will handle it in the
> device tree) - although i was talking to someone about it yesterday.
> It's possible that we might handle that via a register, but if you have
> a suggestion or some precedence that you're aware of that would be useful.
>
> The actual naming convention of the IP cores themselves, yeah. I will
> dig it up for you on Monday.

I meant what if corepwm is enhanced, and how to detect that?

SiFive uses an integer version number, even for hard cores[1].
OpenCores uses an "-rtlsvnN" suffix (isn't svn dead? ;-)
No idea what e.g. LiteX and Microwatt are planning.

[1] Documentation/devicetree/bindings/sifive/sifive-blocks-ip-versioning.txt


Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
Conor Dooley Jan. 12, 2022, 9:38 a.m. UTC | #2
On 17/12/2021 16:00, Geert Uytterhoeven wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
> 
> Hi Conor,
> 
> On Fri, Dec 17, 2021 at 4:32 PM <Conor.Dooley@microchip.com> wrote:
>> On 17/12/2021 13:43, Geert Uytterhoeven wrote:
>>> On Fri, Dec 17, 2021 at 10:33 AM <conor.dooley@microchip.com> wrote:
>>>> From: Conor Dooley <conor.dooley@microchip.com>
>>>>
>>>> Split the device tree for the Microchip MPFS into two sections by adding
>>>> microchip-mpfs-fabric.dtsi, which contains peripherals contained in the
>>>> FPGA fabric.
>>>>
>>>> Signed-off-by: Conor Dooley <conor.dooley@microchip.com>
>>>
>>> Thanks for your patch!
>>>
>>>> --- /dev/null
>>>> +++ b/arch/riscv/boot/dts/microchip/microchip-mpfs-fabric.dtsi
>>>> @@ -0,0 +1,13 @@
>>>> +// SPDX-License-Identifier: (GPL-2.0 OR MIT)
>>>> +/* Copyright (c) 2020-2021 Microchip Technology Inc */
>>>> +
>>>> +/ {
>>>> +       corePWM0: pwm@41000000 {
>>>> +               compatible = "microchip,corepwm";
>>>> +               reg = <0x0 0x41000000 0x0 0xF0>;
>>>> +               microchip,sync-update = /bits/ 8 <0>;
>>>> +               #pwm-cells = <2>;
>>>> +               clocks = <&clkcfg CLK_FIC3>;
>>>> +               status = "disabled";
>>>> +       };
>>>
>>> I'm wondering if these should be grouped under a "fabric" subnode,
>>> like we have an "soc" subnode for on-SoC devices? Rob?
>>>
>>> BTW, do you already have a naming plan for different revisions of
>>> FPGA fabric cores?
>> Not yet (assuming you mean specifically how we will handle it in the
>> device tree) - although i was talking to someone about it yesterday.
>> It's possible that we might handle that via a register, but if you have
>> a suggestion or some precedence that you're aware of that would be useful.
>>
>> The actual naming convention of the IP cores themselves, yeah. I will
>> dig it up for you on Monday.
> 
> I meant what if corepwm is enhanced, and how to detect that?
> 
Looks like "microchip,core<name>-N" is the plan. More recent IP cores 
have a register from which the version number can be read but that isnt 
(and wont be) the case for all versions.
Where this register does exist, we will use it & if not fall back onto 
the compat. string.
> SiFive uses an integer version number, even for hard cores[1].
> OpenCores uses an "-rtlsvnN" suffix (isn't svn dead? ;-)
At least here, "hardware" people seem to be a fan of it still (sadly?)
> No idea what e.g. LiteX and Microwatt are planning. >
> [1] Documentation/devicetree/bindings/sifive/sifive-blocks-ip-versioning.txt
> 
> 
> Gr{oetje,eeting}s,
> 
>                          Geert
> 
> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
> 
> In personal conversations with technical people, I call myself a hacker. But
> when I'm talking to journalists I just say "programmer" or something like that.
>                                  -- Linus Torvalds
diff mbox series

Patch

diff --git a/arch/riscv/boot/dts/microchip/microchip-mpfs-fabric.dtsi b/arch/riscv/boot/dts/microchip/microchip-mpfs-fabric.dtsi
new file mode 100644
index 000000000000..234c1f9bea40
--- /dev/null
+++ b/arch/riscv/boot/dts/microchip/microchip-mpfs-fabric.dtsi
@@ -0,0 +1,13 @@ 
+// SPDX-License-Identifier: (GPL-2.0 OR MIT)
+/* Copyright (c) 2020-2021 Microchip Technology Inc */
+
+/ {
+	corePWM0: pwm@41000000 {
+		compatible = "microchip,corepwm";
+		reg = <0x0 0x41000000 0x0 0xF0>;
+		microchip,sync-update = /bits/ 8 <0>;
+		#pwm-cells = <2>;
+		clocks = <&clkcfg CLK_FIC3>;
+		status = "disabled";
+	};
+};
diff --git a/arch/riscv/boot/dts/microchip/microchip-mpfs-icicle-kit.dts b/arch/riscv/boot/dts/microchip/microchip-mpfs-icicle-kit.dts
index 6d19ba196f12..174f977c164b 100644
--- a/arch/riscv/boot/dts/microchip/microchip-mpfs-icicle-kit.dts
+++ b/arch/riscv/boot/dts/microchip/microchip-mpfs-icicle-kit.dts
@@ -86,3 +86,7 @@  phy1: ethernet-phy@9 {
 		ti,fifo-depth = <0x01>;
 	};
 };
+
+&corePWM0 {
+	status = "okay";
+};
diff --git a/arch/riscv/boot/dts/microchip/microchip-mpfs.dtsi b/arch/riscv/boot/dts/microchip/microchip-mpfs.dtsi
index ce9151edd1b6..808500be26c3 100644
--- a/arch/riscv/boot/dts/microchip/microchip-mpfs.dtsi
+++ b/arch/riscv/boot/dts/microchip/microchip-mpfs.dtsi
@@ -4,6 +4,7 @@ 
 /dts-v1/;
 #include "dt-bindings/clock/microchip,mpfs-clock.h"
 #include "dt-bindings/interrupt-controller/riscv-hart.h"
+#include "microchip-mpfs-fabric.dtsi"
 
 / {
 	#address-cells = <2>;