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[78.88.45.245]) by smtp.gmail.com with ESMTPSA id 4fb4d7f45d1cf-6631448605fsm521124a12.12.2026.03.11.06.07.19 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 11 Mar 2026 06:07:21 -0700 (PDT) Message-ID: Date: Wed, 11 Mar 2026 14:07:18 +0100 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v1] arm64: dts: qcom: hamoa-iot-evk: support Bluetooth over both USB and UART To: Shuai Zhang , Bjorn Andersson , Konrad Dybcio , Rob Herring , Krzysztof Kozlowski , Conor Dooley Cc: linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-bluetooth@vger.kernel.org, cheng.jiang@oss.qualcomm.com, quic_chezhou@quicinc.com, wei.deng@oss.qualcomm.com, jinwang.li@oss.qualcomm.com, mengshi.wu@oss.qualcomm.com References: <20260311090921.1892191-1-shuai.zhang@oss.qualcomm.com> Content-Language: en-US From: Konrad Dybcio In-Reply-To: <20260311090921.1892191-1-shuai.zhang@oss.qualcomm.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMzExMDExMSBTYWx0ZWRfX6J3qJmsf+gs5 S+diW7CNY5wyA8UOYliQz23S3hzL9wdIrKXmna7IhvUJJN3bPNO/7fpOdR4B3ZI392eW7nNJ+o/ JIF4rSlp5S2yTKgDV7VZpbxZYlJSM3IOn7aOG6rK6R4AXlzCemWTdxcq3w798AmgMNaZP47DsdD PZcH8gQpERhNvVH3YKaDq/wogvtEw1f4qNhse7/vAYNo6+SD6ymj2Mi8o9nABq45E01ijQ+kGJj bjkQWWe7yZYuJP67hvClOBn02kaD7UoSAJfN4wf/LAK013sBMGwi+FtzgcWHLlAo6Vgj5lEWDPw QdF14cS1bjBQr3L9cv2yoP+8jedltjoVSfmjqwOmgeA9ARb10fVodY7D2J7Q/7Sw3dKophstMQ0 yelUDm9KjpaMsYFEN3NLw3Yjh7xg2HAuC6j+zkGvWenCJfQSdZR9eXAa+sBLcCyAb8/UjfgXqGK S+pkUprEAbag9G9u0qA== X-Proofpoint-GUID: GRgs5lCdnkUzW0ZdGd1OvAqNxD6E-MYB X-Proofpoint-ORIG-GUID: GRgs5lCdnkUzW0ZdGd1OvAqNxD6E-MYB X-Authority-Analysis: v=2.4 cv=Cq+ys34D c=1 sm=1 tr=0 ts=69b1690c cx=c_pps a=R6oCqFB+Yf/t2GF8e0/dFg==:117 a=FpWmc02/iXfjRdCD7H54yg==:17 a=IkcTkHD0fZMA:10 a=Yq5XynenixoA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=ZpdpYltYx_vBUK5n70dp:22 a=EUspDBNiAAAA:8 a=BgJLFjmsKqNP7uD8e2MA:9 a=QEXdDO2ut3YA:10 a=TD8TdBvy0hsOASGTdmB-:22 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-03-11_01,2026-03-09_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 phishscore=0 bulkscore=0 spamscore=0 lowpriorityscore=0 impostorscore=0 malwarescore=0 priorityscore=1501 clxscore=1015 suspectscore=0 adultscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2602130000 definitions=main-2603110111 On 3/11/26 10:09 AM, Shuai Zhang wrote: > When Bluetooth supports both USB and UART, the BT UART driver is > always loaded, while USB is hot-pluggable. As a result, when Bluetooth > is used over USB, the UART driver still be probed and drive BT_EN low, > which causes the Bluetooth device on USB to be disconnected. Is bluetooth connected over UART *and* USB simultaneously? > Configure BT_EN as a GPIO hog so that it is controlled by the platform What's "the platform"? > instead of the UART driver, preventing BT over USB from being > unintentionally powered down. > > Signed-off-by: Shuai Zhang > --- > arch/arm64/boot/dts/qcom/hamoa-iot-evk.dts | 14 +++++++------- > 1 file changed, 7 insertions(+), 7 deletions(-) > > diff --git a/arch/arm64/boot/dts/qcom/hamoa-iot-evk.dts b/arch/arm64/boot/dts/qcom/hamoa-iot-evk.dts > index 630642baa435..60a0b3ecbc1b 100644 > --- a/arch/arm64/boot/dts/qcom/hamoa-iot-evk.dts > +++ b/arch/arm64/boot/dts/qcom/hamoa-iot-evk.dts > @@ -647,10 +647,9 @@ wcn7850-pmu { > vddrfa1p2-supply = <&vreg_wcn_1p9>; > vddrfa1p8-supply = <&vreg_wcn_1p9>; > > - bt-enable-gpios = <&tlmm 116 GPIO_ACTIVE_HIGH>; What if I want to power down Bluetooth now? > wlan-enable-gpios = <&tlmm 117 GPIO_ACTIVE_HIGH>; > > - pinctrl-0 = <&wcn_bt_en>, <&wcn_wlan_en>; > + pinctrl-0 = <&wcn_wlan_en>; > pinctrl-names = "default"; > > regulators { > @@ -1398,11 +1397,12 @@ wcd_default: wcd-reset-n-active-state { > output-low; > }; > > - wcn_bt_en: wcn-bt-en-state { > - pins = "gpio116"; > - function = "gpio"; > - drive-strength = <2>; > - bias-disable; > + wcn_bt_en_hog: wcn-bt-en-state-hog { This name is illegal (make CHECK_DTBS=1 qcom/hamoa-iot-evk.dtb) > + gpio-hog; > + gpios = <116 GPIO_ACTIVE_HIGH>; > + output-high; > + input-disable; This property is not allowed for TLMM pins > + link-name = "BT_EN"; This property doesn't exist Konrad