Re: [PATCH v2 6/6] arm64: dts: qcom: rb3gen2: add Industrial BT UART overlay

[Rahul Samana <rahul.samana@oss.qualcomm.com>]

On 29-07-2026 18:01, Konrad Dybcio wrote:
> On 7/27/26 5:45 PM, Rahul Samana wrote:
>> The reworked RB3 Gen 2 Industrial mezzanine keeps the common Industrial
>> mezzanine hardware description but routes QCC2072 Bluetooth over UART4
>> instead of the default Bluetooth-over-USB path.
>>
>> Build this variant by applying the common Industrial mezzanine overlay
>> first, followed by the BT UART overlay. The overlay models the M.2 E-key
>> connector graph endpoints for PCIe and UART, and disables the on-board
>> WCN6750 PMU and UART7 path so the M.2 QCC2072 Bluetooth controller can be
>> used instead.
> 
> So is the onboard module disabled? Can we not just use two in parallel?
> 

The Industrial mezzanine variants do not support the on-board WCN6750
wireless path. The common Industrial mezzanine overlay already disables
the on-board Wi-Fi node.

I will move the on-board BT UART/PMU disablement to the same common
Industrial mezzanine overlay in v3, so the BT UART overlay only models
the reworked M.2 UART wiring.

> [...]
> 
>> +&pcie0_m2_e {
>> +	port {
>> +		pcie0_m2_e_ep: endpoint {
>> +			remote-endpoint = <&m2_e_pcie_ep>;
>> +		};
>> +	};
>> +};
>> +
>> +&uart4 {
>> +	interrupts-extended = <&intc GIC_SPI 605 IRQ_TYPE_LEVEL_HIGH>,
>> +			      <&tlmm 19 IRQ_TYPE_EDGE_FALLING>;
>> +	pinctrl-names = "default", "sleep";
>> +	pinctrl-1 = <&qup_uart4_sleep_cts>, <&qup_uart4_sleep_rts>,
>> +		    <&qup_uart4_sleep_tx>, <&qup_uart4_sleep_rx>;
>> +
>> +	status = "okay";
>> +
>> +	port {
>> +		uart4_m2_e_ep: endpoint {
>> +			remote-endpoint = <&m2_e_uart_ep>;
>> +		};
>> +	};
> 
> Let's define both PCIe and UART endpoint sin the SoC DTSI. And don't
> mention "m2" in their labels.
> 
> Just pcie0_port0_ep and uart4_ep respectively.
>

Okay. I will move the PCIe and UART graph endpoints to the common SoC DTSI
with those generic labels in v3, and keep only the connector-side wiring
in the overlay.

Thanks,
Rahul

> Konrad