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Mon, 18 May 2026 23:50:06 -0700 (PDT) Received: from hu-anupkulk-hyd.qualcomm.com ([202.46.22.19]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2bd5d11d6easm188306675ad.72.2026.05.18.23.50.03 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 18 May 2026 23:50:06 -0700 (PDT) From: Anup Kulkarni To: andersson@kernel.org Cc: 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, mukesh.savaliya@oss.qualcomm.com, viken.dadhaniya@oss.qualcomm.com, Anup Kulkarni Subject: [PATCH v3] arm64: dts: qcom: lemans-evk: Enable CAN RX via I2C GPIO expander Date: Tue, 19 May 2026 12:19:54 +0530 Message-Id: <20260519064954.2759960-1-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-GUID: 2U3-PyrIOuyJV7yY_bZPnjAg7VtfBIAZ X-Proofpoint-ORIG-GUID: 2U3-PyrIOuyJV7yY_bZPnjAg7VtfBIAZ X-Authority-Analysis: v=2.4 cv=a9sAM0SF c=1 sm=1 tr=0 ts=6a0c0820 cx=c_pps a=JL+w9abYAAE89/QcEU+0QA==:117 a=fChuTYTh2wq5r3m49p7fHw==:17 a=NGcC8JguVDcA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=rJkE3RaqiGZ5pbrm-msn:22 a=EUspDBNiAAAA:8 a=l0BCks6i3eRASjQ-E0wA:9 a=324X-CrmTo6CU4MGRt3R:22 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNTE5MDA2NSBTYWx0ZWRfXxLgP1GYcs8d8 pasDoEJ6+HyQDJH55U5KQsoAKY5FBtMfrYrK9GprHzcQTHl6u/Ii0hKcFZWfBXYoYzp7sVhWJwm 0Iw4fJRxbt7RTk1Dc0Dg0jVv0V6VfbM6U6AE3YZxX7IlerrImpHe0xRGyZ1IHutRpnAcjk2TU1E PKVVn6gp9mhqal4tFnu1Af4TOSp0Q4+oECPUT0cI9xLFprYBY4Eyev3LqQFHMSO+iI2XkvLTUDi FeDitT98tBfqxg+PI+a0L2sqaTB1WTBsZu1f1384UU8aSaliueFPDlwBv8NSmgmTk7KOXKY5sJS 80sudZOAo+gRSJcTtiaEvlobyZxoH0wlOcGA+2Wie+uN71g+2Dp4a8cHMNM8AiWeKjyQgUsDHNf b9lgErIQV0UGuTgTxUbmNNTUF/R8IIF2T5VZPrUeThZ/EiRF0zZIxjcj7B0LpwvI0ACwOWnq/Mc 0iT47ciLNn1JT6RzOSA== 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=2026-05-19_02,2026-05-18_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 priorityscore=1501 impostorscore=0 adultscore=0 clxscore=1015 lowpriorityscore=0 bulkscore=0 suspectscore=0 spamscore=0 phishscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2605130000 definitions=main-2605190065 Content-Type: text/plain; charset="utf-8" The LeMans EVK board routes the RX lines of CAN controllers 2, 4, and 6 (part of the RTSS subsystem) through a signal multiplexer controlled by GPIO 4 of the I2C GPIO expander at address 0x3b. The remaining CAN controllers, out of 8 total on RTSS, are wired directly to their transceivers. The multiplexer select pin defaults low on reset, disconnecting CAN 2, 4, and 6 RX lines from their respective transceivers, which results in no data being received on these interfaces. Configure GPIO 4 as output-high to assert the mux select line at boot, connecting the RX signals of CAN 2, 4, and 6 to their transceivers as required by the EVK board wiring. Signed-off-by: Anup Kulkarni Reviewed-by: Dmitry Baryshkov --- v1->v2 - Fixed commit text to include platform name. v2->v3 - Updated commit text. --- 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