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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: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNTA3MDExOCBTYWx0ZWRfX5yrlwPtXX6+o Jy/v4/e0wYGd6cc6Nt7mKwW7JbTGhfJE0wurD+vM9/FXhO4bRHz6AH+Zbj5Z7aSlB/LBZSSoM3n WyD0TLyWKfYxy/8KK8LiPzgHV6C+3Y6Rwh8u5MnUZNszymSU6740M7rKg4kWKR2I4oLfqk/rynC fYriJQEMfJL84u6K7dfMeW7txlKPjfYboAGolE9go8YI2gwNfAkLR83/vV4L0k559CiZ926oArL bbkuRXGkhFSk7TCbAWc1IXi2UQ7gLLETIaLbeahZYHGUsdFvYvqtxzITe5EuXDz1ww3OTnwTsJs 7PBwzp+XM+wqe6fkY0mnNFqqun3ncQizBN92CZhpsFP7UOEQdW53T9qvflfMJ9hkegMP1A/QLeM Wbqc1OTjYD/kDCriuQKkwojVLDqHkurALiEI68a/weZWAX0VZ2Gs0OPWyTJG8DCcAdp5A7FXZdA KPT3jx1MyLdJ97o99gw== X-Proofpoint-ORIG-GUID: 7KnUXFuIOKZIWPlTDPvHl2VlWvkAib4S X-Proofpoint-GUID: 7KnUXFuIOKZIWPlTDPvHl2VlWvkAib4S X-Authority-Analysis: v=2.4 cv=ZZ4t8MVA c=1 sm=1 tr=0 ts=69fc7d4f cx=c_pps a=WW5sKcV1LcKqjgzy2JUPuA==:117 a=fChuTYTh2wq5r3m49p7fHw==:17 a=NGcC8JguVDcA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=YMgV9FUhrdKAYTUUvYB2:22 a=EUspDBNiAAAA:8 a=HURNEOczjUzzROzEHuAA:9 a=OpyuDcXvxspvyRM73sMx: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=2026-05-06_02,2026-05-06_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 suspectscore=0 spamscore=0 priorityscore=1501 bulkscore=0 phishscore=0 clxscore=1015 impostorscore=0 malwarescore=0 adultscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2604200000 definitions=main-2605070118 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 = <&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