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Thu, 02 Apr 2026 03:53:01 -0700 (PDT) Received: from hu-anupkulk-hyd.qualcomm.com ([202.46.22.19]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-35dd368f538sm3464203a91.14.2026.04.02.03.52.57 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 02 Apr 2026 03:53:00 -0700 (PDT) From: Anup Kulkarni To: andersson@kernel.org, konradybcio@kernel.org, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Cc: mukesh.savaliya@oss.qualcomm.com, viken.dadhaniya@oss.qualcomm.com, Anup Kulkarni Subject: [PATCH v1] arm64: dts: qcom: Enable CAN RX via GPIO expander Date: Thu, 2 Apr 2026 16:22:53 +0530 Message-Id: <20260402105253.3009382-1-anup.kulkarni@oss.qualcomm.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNDAyMDA5NyBTYWx0ZWRfX0O6+brRgfnFJ C2jTyjR2UCiS/k3UozNf5ulgxpxC55NCbgs6z+2Yf2yxxGS8qbRnZDB3VoAwW5PYpqs5at7XLaC svcK9qEDQSSWYd/E3Srkd3bfa+qE+l7I6M8MESGqQRPlAV9/d/Nk9S7+0tp5uBcxYZyT0V2PiJn P40H4JHKlBelt8GUbBeUO3OePKHDZ6vi4v3f7YcTitVetWgNeOkXZErKP+TMnJLHU55rgkhQx6y Sbyy7fG3vCCK1VEZMvwOoP182/g6hBj5EK6cKkxtcvRIwjNxSoV5qSwskTyHXsNwQw4pmb7DUOh J3whHyq0p6oBPL7oxxnoMcAyEVlK+5blh7jPK38+nnx2h65rKBe2eXRcPrXSXeHRYJnGQDHkKhG GxFZVhEYdclDYKccfODkyZohXKwd7kZOHGunog+lOlszCpygficWWmwKwJJ5q7ngw+pO7NmNu90 3YC6ZSXa5F4X1qRjkkA== X-Authority-Analysis: v=2.4 cv=DJSCIiNb c=1 sm=1 tr=0 ts=69ce4a8e cx=c_pps a=UNFcQwm+pnOIJct1K4W+Mw==:117 a=fChuTYTh2wq5r3m49p7fHw==:17 a=A5OVakUREuEA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=gowsoOTTUOVcmtlkKump:22 a=EUspDBNiAAAA:8 a=HURNEOczjUzzROzEHuAA:9 a=uKXjsCUrEbL0IQVhDsJ9:22 X-Proofpoint-ORIG-GUID: YbyJtAb0L9n6uXHW5KMlRlZVix7yHbtO X-Proofpoint-GUID: YbyJtAb0L9n6uXHW5KMlRlZVix7yHbtO 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=2026-04-02_01,2026-04-02_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 suspectscore=0 bulkscore=0 clxscore=1011 malwarescore=0 adultscore=0 impostorscore=0 spamscore=0 lowpriorityscore=0 phishscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2603050001 definitions=main-2604020097 Few CAN controllers, part of RTSS sub-system on LeMans, route their RX signal through a I2C GPIO expander at address 0x3b. RTSS subsystem is an MCU like sub-system on LeMans with independent booting capability through OSPI interface and supports peripherals like RGMII, CAN-FD, UART, I2C, SPI etc. Describe this hardware wiring by configuring the expander GPIO 4 pin as hog with output-high, asserting the selected line during boot. Signed-off-by: Anup Kulkarni --- arch/arm64/boot/dts/qcom/lemans-evk.dts | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/arch/arm64/boot/dts/qcom/lemans-evk.dts b/arch/arm64/boot/dts/qcom/lemans-evk.dts index a1ef4eba2a20..b8371bdf9933 100644 --- a/arch/arm64/boot/dts/qcom/lemans-evk.dts +++ b/arch/arm64/boot/dts/qcom/lemans-evk.dts @@ -615,6 +615,13 @@ expander3: gpio@3b { interrupts-extended = <&tlmm 39 IRQ_TYPE_LEVEL_LOW>; pinctrl-0 = <&expander3_int>; pinctrl-names = "default"; + + rtss-can-sel-hog { + gpio-hog; + gpios = <4 GPIO_ACTIVE_HIGH>; + output-high; + line-name = "rtss-can-sel"; + }; }; eeprom@50 { -- 2.34.1