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SubjectRe: [PATCH 3/5] arm64: dts: qcom: Add base SC8380XP dtsi and the QCP dts
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On 10/25/23 16:24, Sibi Sankar wrote:
> From: Rajendra Nayak <quic_rjendra@quicinc.com>
>
> Add base dtsi and QCP board (Qualcomm Compute Platform) dts file for
> SC8380XP SoC, describing the CPUs, GCC and RPMHCC clock controllers,
> geni UART, interrupt controller, TLMM, reserved memory, interconnects,
> SMMU and LLCC nodes.
>
> Co-developed-by: Abel Vesa <abel.vesa@linaro.org>
> Signed-off-by: Abel Vesa <abel.vesa@linaro.org>
> Signed-off-by: Rajendra Nayak <quic_rjendra@quicinc.com>
> Co-developed-by: Sibi Sankar <quic_sibis@quicinc.com>
> Signed-off-by: Sibi Sankar <quic_sibis@quicinc.com>
> ---
[...]

> +&tlmm {
> + gpio-reserved-ranges = <33 3>, <44 4>, <238 1>;
It would be really cool if you added an explanation on why these
GPIOs need to be reserved, especially since you can see what's
connected on there on schematics. So, like:

gpio-reserved-ranges = <33 3>, /* something */
<44 4>, /* something else (fp scanner?)
<238 1>; /* UFS reset? */


[...]

> + compatible = "qcom,oryon";
Again, this compatible won't fly unless all of these cores
are totally identical and Oryon is only a name for this
generation on this SoC (which I believe not to be the case).

> + reg = <0x0 0x0>;
> + enable-method = "psci";
> + next-level-cache = <&L1_0>;
> +
> + L1_0: l1-cache {
> + compatible = "cache";
I'm not sure if L1 is supposed to be described in the DT,
Krzysztof should know.

> + next-level-cache = <&L2_0>;
> +
> + L2_0: l2-cache-0 {
> + compatible = "cache";
cache-level?
cache-unified?

[...]

> + memory@80000000 {
> + device_type = "memory";
> + /* We expect the bootloader to fill in the size */
> + reg = <0 0x80000000 0 0x80000000>;
That contradicts the comment you made above. Plus, 2 GiB seems a
bit low for this SoC :D

[...]

> + gunyah_hyp_mem: gunyah-hyp-region@80000000 {
you can probably strip the "-region" part, as this is implied by
being a child of /reserved-memory

> + pld_pep_mem: pld-pep-region@81f30000 {
What's PLD?

What's this region used for? PEP is a Windows invention.

[...]

> + av1_encoder_mem: av1-encoder-region@8e900000 {
Is AV1enc hardware separate from iris?

[...]

> + gcc: clock-controller@100000 {
> + compatible = "qcom,sc8380xp-gcc";
> + reg = <0 0x100000 0 0x200000>;
The address part of reg should be padded to 8 hex digits.

> +
> + interconnects = <&clk_virt MASTER_QUP_CORE_2 0 &clk_virt SLAVE_QUP_CORE_2 0>,
QCOM_ICC_TAG_ALWAYS would be nicer than 0 (see sa8775p)

[...]

> +
> + interrupts = <GIC_SPI 65 IRQ_TYPE_LEVEL_HIGH>,
One space after and before '='

Konrad

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