[PATCH v2 14/15] arm64: dts: qcom: Add initial Milos dtsi

[Luca Weiss]

Hi Konrad,

On Thu Jul 17, 2025 at 10:29 AM CEST, Luca Weiss wrote:
> On Mon Jul 14, 2025 at 1:06 PM CEST, Konrad Dybcio wrote:
>> On 7/13/25 10:05 AM, Luca Weiss wrote:
>>> Add a devicetree description for the Milos SoC, which is for example
>>> Snapdragon 7s Gen 3 (SM7635).
>>> 
>>> Signed-off-by: Luca Weiss <luca.weiss at fairphone.com>
>>> ---
>>
>> [...]
>>> +
>>> +		spmi_bus: spmi at c400000 {
>>> +			compatible = "qcom,spmi-pmic-arb";
>>
>> There's two bus instances on this platform, check out the x1e binding
>
> Will do

One problem: If we make the labels spmi_bus0 and spmi_bus1 then we can't
reuse the existing PMIC dtsi files since they all reference &spmi_bus.

On FP6 everything's connected to PMIC_SPMI0_*, and PMIC_SPMI1_* is not
connected to anything so just adding the label spmi_bus on spmi_bus0
would be fine.

Can I add this to the device dts? Not going to be pretty though...

diff --git a/arch/arm64/boot/dts/qcom/milos-fairphone-fp6.dts b/arch/arm64/boot/dts/qcom/milos-fairphone-fp6.dts
index d12eaa585b31..69605c9ed344 100644
--- a/arch/arm64/boot/dts/qcom/milos-fairphone-fp6.dts
+++ b/arch/arm64/boot/dts/qcom/milos-fairphone-fp6.dts
@@ -11,6 +11,9 @@
 #include <dt-bindings/pinctrl/qcom,pmic-gpio.h>
 #include <dt-bindings/regulator/qcom,rpmh-regulator.h>
 #include "milos.dtsi"
+
+spmi_bus: &spmi_bus0 {};
+
 #include "pm7550.dtsi"
 #include "pm8550vs.dtsi"
 #include "pmiv0104.dtsi" /* PMIV0108 */

Or I can add a second label for the spmi_bus0 as 'spmi_bus'. Not sure
other designs than SM7635 recommend using spmi_bus1 for some stuff.

But I guess longer term we'd need to figure out a solution to this, how
to place a PMIC on a given SPMI bus, if reference designs start to
recommend putting different PMIC on the separate busses.

Regards
Luca