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Thu, 07 May 2026 04:53:50 -0700 (PDT) Received: from hu-anupkulk-hyd.qualcomm.com ([202.46.22.19]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-83965646254sm8976072b3a.10.2026.05.07.04.53.46 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 07 May 2026 04:53:49 -0700 (PDT) From: Anup Kulkarni To: andersson@kernel.org, dmitry.baryshkov@oss.qualcomm.com, konradybcio@kernel.org Cc: 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, mukesh.savaliya@oss.qualcomm.com, viken.dadhaniya@oss.qualcomm.com, Anup Kulkarni Subject: [PATCH v2] arm64: dts: qcom: Enable CAN RX via GPIO expander Date: Thu, 7 May 2026 17:23:24 +0530 Message-Id: <20260507115324.1814329-1-anup.kulkarni@oss.qualcomm.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Proofpoint-ORIG-GUID: Unljfyz1uJmGBq3PlNeIwUUnpt6eABI3 X-Authority-Analysis: v=2.4 cv=caHiaHDM c=1 sm=1 tr=0 ts=69fc7d4f cx=c_pps a=rEQLjTOiSrHUhVqRoksmgQ==:117 a=fChuTYTh2wq5r3m49p7fHw==:17 a=NGcC8JguVDcA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=yOCtJkima9RkubShWh1s:22 a=EUspDBNiAAAA:8 a=HURNEOczjUzzROzEHuAA:9 a=2VI0MkxyNR6bbpdq8BZq:22 X-Proofpoint-GUID: Unljfyz1uJmGBq3PlNeIwUUnpt6eABI3 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNTA3MDExOCBTYWx0ZWRfX7/41tBBj6X7M j5VXLZjJlgrND0bUJKrAm6TTInSDqn9NWih7Ctl4UWC739aXwRW5kjNqKobz+DlCDrQ3jeC5CvM j5+cQSkWg8FxJPaWanHDjbVpfHan79e3OFD8Hm47x5hcAFCkPbCAVgfxD+jwfVg8asPtWnNZrla ipJB+sxDY9xh4o1a/M6Pa5/7Ms8kWgXJQXNS8GGP2Z2+qlD7ZPEQTYocbv3CWRQLvin0tVxqJMB NsyNR9YHeUuQI5o9OWTLmAxC44NYzv6aNWXKNQG13pmY03yoSq73UiWmvSjjHdTyx6ov63Ppr1k leEcFetO/MZzbaHLSwFjAdTX1dqSiABx0xUkatxwNHZsYhN7U7xkZzVE7WXk6A9WoibUqz3Utzc TWRwPSsZ9TUCgZ+Bwc8jbh9ykASTf6itEkHVwhD8UchF5z90+anreK3dKhNVhCgi3kBns8UeplF vPmdhOrbneSdmWd+a7g== 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=2026-05-06_02,2026-05-06_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 clxscore=1015 suspectscore=0 bulkscore=0 priorityscore=1501 adultscore=0 lowpriorityscore=0 impostorscore=0 spamscore=0 phishscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2604200000 definitions=main-2605070118 Content-Type: text/plain; charset="utf-8" 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 LeMans EVK 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 --- v1->v2 - Fixed commit text to include platform name. --- 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 c665db6a4595..34dfc8d22b6a 100644 --- a/arch/arm64/boot/dts/qcom/lemans-evk.dts +++ b/arch/arm64/boot/dts/qcom/lemans-evk.dts @@ -616,6 +616,13 @@ expander3: gpio@3b { interrupts-extended =3D <&tlmm 39 IRQ_TYPE_LEVEL_LOW>; pinctrl-0 =3D <&expander3_int>; pinctrl-names =3D "default"; + + rtss-can-sel-hog { + gpio-hog; + gpios =3D <4 GPIO_ACTIVE_HIGH>; + output-high; + line-name =3D "rtss-can-sel"; + }; }; =20 eeprom@50 { --=20 2.34.1