Re: [PATCH 3/8] arm64: dts: morello: Add support for common functionalities

Vincenzo Frascino
2024-12-19T17:16:11Z

On 14/12/2024 10:11, Krzysztof Kozlowski wrote:
> On 13/12/2024 17:32, Vincenzo Frascino wrote:
>> The Morello architecture is an experimental extension to Armv8.2-A,
>> which extends the AArch64 state with the principles proposed in
>> version 7 of the Capability Hardware Enhanced RISC Instructions
>> (CHERI) ISA.
>>
>> The Morello Platform (soc) and the Fixed Virtual Platfom (fvp) share
>> some functionalities that have conveniently been included in
>> morello.dtsi to avoid duplication.
>>
>> Introduce morello.dtsi.
>>
>> Note: Morello fvp will be introduced with a future patch series.
>>
>> Cc: Sudeep Holla <sudeep.holla@arm.com>
>> Cc: Rob Herring <robh@kernel.org>
>> Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
>> ---
>> arch/arm64/boot/dts/arm/morello.dtsi | 112 +++++++++++++++++++++++++++
>> 1 file changed, 112 insertions(+)
>> create mode 100644 arch/arm64/boot/dts/arm/morello.dtsi
>>
>> diff --git a/arch/arm64/boot/dts/arm/morello.dtsi b/arch/arm64/boot/dts/arm/morello.dtsi
>> new file mode 100644
>> index 000000000000..9d84a0840c5b
>> --- /dev/null
>> +++ b/arch/arm64/boot/dts/arm/morello.dtsi
>> @@ -0,0 +1,112 @@
>> +// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
>> +/*
>> + * Copyright (c) 2020-2024, Arm Limited. All rights reserved.
>> + */
>> +
>> +#include <dt-bindings/interrupt-controller/arm-gic.h>
>> +
>> +/ {
>> + compatible = "arm,morello";
>> +
>> + interrupt-parent = <&gic>;
>> + #address-cells = <2>;
>> + #size-cells = <2>;
>> +
>> + aliases {
>> + serial0 = &soc_uart0;
>> + };
>> +
>> + gic: interrupt-controller@2c010000 {
>> + compatible = "arm,gic-v3";
>> + #address-cells = <2>;
>> + #interrupt-cells = <3>;
>> + #size-cells = <2>;
>> + ranges;
>> + interrupt-controller;
>> + };
>> +
>> + pmu {
>> + compatible = "arm,armv8-pmuv3";
>> + interrupts = <GIC_PPI 7 IRQ_TYPE_LEVEL_HIGH>;
>> + };
>> +
>> + spe-pmu {
>> + compatible = "arm,statistical-profiling-extension-v1";
>> + interrupts = <GIC_PPI 5 IRQ_TYPE_LEVEL_HIGH>;
>> + };
>> +
>> + psci {
>> + compatible = "arm,psci-0.2";
>> + method = "smc";
>> + };
>> +
>> + timer {
>> + compatible = "arm,armv8-timer";
>> + interrupts = <GIC_PPI 13 IRQ_TYPE_LEVEL_LOW>,
>> + <GIC_PPI 14 IRQ_TYPE_LEVEL_LOW>,
>> + <GIC_PPI 11 IRQ_TYPE_LEVEL_LOW>,
>> + <GIC_PPI 10 IRQ_TYPE_LEVEL_LOW>;
>> + };
>> +
>> + mailbox: mhu@45000000 {
>
>
> You cannot have MMIO nodes outside of soc.
>

Ok, I will move it to morello.dtsi.

>> + compatible = "arm,mhu-doorbell", "arm,primecell";
>> + reg = <0x0 0x45000000 0x0 0x1000>;
>> + interrupts = <GIC_SPI 318 IRQ_TYPE_LEVEL_HIGH>,
>> + <GIC_SPI 316 IRQ_TYPE_LEVEL_HIGH>;
>> + interrupt-names = "mhu-lpri-rx",
>> + "mhu-hpri-rx";
>> + #mbox-cells = <2>;
>> + mbox-name = "ARM-MHU";
>> + clocks = <&soc_refclk50mhz>;
>> + clock-names = "apb_pclk";
>> + };
>> +
>> + sram: sram@45200000 {
>> + compatible = "mmio-sram";
>> + reg = <0x0 0x06000000 0x0 0x8000>;
>> +
>> + #address-cells = <1>;
>> + #size-cells = <1>;
>> + ranges = <0 0x0 0x06000000 0x8000>;
>> +
>> + cpu_scp_hpri0: scp-sram@0 {
>> + compatible = "arm,scmi-shmem";
>> + reg = <0x0 0x80>;
>> + };
>> +
>> + cpu_scp_hpri1: scp-sram@80 {
>> + compatible = "arm,scmi-shmem";
>> + reg = <0x80 0x80>;
>> + };
>> + };
>> +
>> + soc_refclk50mhz: refclk50mhz {
>
> Please use name for all fixed clocks which matches current format
> recommendation: 'clock-<freq>' (see also the pattern in the binding for
> any other options).
>
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/devicetree/bindings/clock/fixed-clock.yaml?h=v6.11-rc1
>

All right.

>> + compatible = "fixed-clock";
>> + #clock-cells = <0>;
>> + clock-frequency = <50000000>;
>> + clock-output-names = "apb_pclk";
>> + };
>> +
>> + soc_refclk85mhz: refclk85mhz {
>
> Please use name for all fixed clocks which matches current format
> recommendation: 'clock-<freq>' (see also the pattern in the binding for
> any other options).
>
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/devicetree/bindings/clock/fixed-clock.yaml?h=v6.11-rc1
>
>
>> + compatible = "fixed-clock";
>> + #clock-cells = <0>;
>> + clock-frequency = <85000000>;
>> + clock-output-names = "iofpga:aclk";
>> + };
>> +
>> + soc_uartclk: uartclk {
>
>
> Only one space.
>
> Please use name for all fixed clocks which matches current format
> recommendation: 'clock-<freq>' (see also the pattern in the binding for
> any other options).
>
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/devicetree/bindings/clock/fixed-clock.yaml?h=v6.11-rc1
>
>> + compatible = "fixed-clock";
>> + #clock-cells = <0>;
>> + clock-frequency = <50000000>;
>> + clock-output-names = "uartclk";
>> + };
>> +
>> + soc_uart0: serial@2a400000 {
>> + compatible = "arm,pl011", "arm,primecell";
>> + reg = <0x0 0x2a400000 0x0 0x1000>;
>> + interrupts = <GIC_SPI 63 IRQ_TYPE_LEVEL_HIGH>;
>> + clocks = <&soc_uartclk>, <&soc_refclk50mhz>;
>> + clock-names = "uartclk", "apb_pclk";
>> + status = "okay";
>
> Why do you need it? Did you disable it?
>
>> + };
>> +};
>
>
> Best regards,
> Krzysztof

--
Regards,
Vincenzo