Re: [PATCH v2 02/18] arm64: dts: qcom: Add SM6350 device tree

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Hi,

On 8/28/2021 9:52 PM, Konrad Dybcio wrote:
+
+        tcsr_mutex: hwlock@1f40000 {
+            compatible = "qcom,tcsr-mutex";
+            reg = <0x0 0x01f40000 0x0 0x40000>;
+            #hwlock-cells = <1>;
+        };
+
+        pdc: interrupt-controller@b220000 {
+            compatible = "qcom,sm6350-pdc", "qcom,pdc";
+            reg = <0 0x0b220000 0 0x30000>, <0 0x17c000f0 0 0x64>;
The second reg  0x17c000f0 is neither documented nor used in PDC irq chip driver. can you please remove it?

Thanks,
Maulik

Wouldn't it make more sense to keep it (like in other PDC-enabled SoCs' device trees) so that there's no

need to add it back when the driver gains support for spi_configure_type (I believe that's what it's used for)?
The second reg in some of the PDC enabled SoCs' went in since it may have slipped throgh code reviews when using downstream
patch as is on upstream.
Also the bindings document for PDC is still in txt, so yaml check could not catch the extra register which is not documented.

An attempt to add support for spi_configure_type [1] & [2] had suggestion either to access second reg via mailbox or add another level of irqchip hierarchy between PDC to GIC to configure SPI type. Unless both [1] and [2] patch can go in as PDC irqchip driver won't gain support to use it. (using mailbox approch will have mailbox driver to access this register and PDC node may mention which mailbox to use).

[1] https://patchwork.kernel.org/project/linux-arm-msm/patch/1568411962-1022-7-git-send-email-ilina@xxxxxxxxxxxxxx/

[2] https://patchwork.kernel.org/project/linux-arm-msm/patch/1568411962-1022-8-git-send-email-ilina@xxxxxxxxxxxxxx/

Thanks,
Maulik



Konrad

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