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[78.88.45.245]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-b9d6e7f189esm399575766b.58.2026.04.14.08.07.36 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 14 Apr 2026 08:07:38 -0700 (PDT) Message-ID: <1bf5b11c-620e-4d81-af33-a987136b0f21@oss.qualcomm.com> Date: Tue, 14 Apr 2026 17:07:35 +0200 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: Enable CAN RX via GPIO expander To: Anup Kulkarni , 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 References: <20260402105253.3009382-1-anup.kulkarni@oss.qualcomm.com> Content-Language: en-US From: Konrad Dybcio In-Reply-To: <20260402105253.3009382-1-anup.kulkarni@oss.qualcomm.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNDE0MDE0MiBTYWx0ZWRfX9iyHJ59b2K7z z/ksej7nk4u621f9OH96CUssuiN6R6Q26afvclE2dP9MeqDYWDm7OmROP4LadmlemU0KdGY4vtH t/0j+3T823zbGpNM5ch6ajEKz286MGsczoMRBrxVLhkjFcBwC+9lpQikRovV5DCqSceDHYFyIgs fgkX1qTujQnnnlF6fk78UiPZJN1ocyWyLkhw0X+Ctzo4xEhd7LPYx9RxASYtNbajH8OUSnIXzng xC5/4IUfwlDC7vlO5dFkF6VS7wPTItkCGgtS3U6QtKs2ysKjtG2TwVExQzaReMFMa+52pBtkoCg RWZCEbKvoitJAwaMC3CiDfxigcM3rzXEm8MDcRj4Ve8MbJotYEiYsdJ5vxtIjgGINoy1n5ZDEAu IOCBZ8xv7KXfnY/zzdGNQEgEdPXyhRlLZpBOTgv0Wtr9tv/ruGuiBC4VgP51ryfRdUw7iufzKM8 3ALUTQurmlW5eeJEPlg== X-Proofpoint-ORIG-GUID: -ynF5rMyS_29DgYnWRB9EX95RCgLPrn5 X-Proofpoint-GUID: -ynF5rMyS_29DgYnWRB9EX95RCgLPrn5 X-Authority-Analysis: v=2.4 cv=HJLz0Itv c=1 sm=1 tr=0 ts=69de583c cx=c_pps a=4ztaESFFfuz8Af0l9swBwA==:117 a=FpWmc02/iXfjRdCD7H54yg==:17 a=IkcTkHD0fZMA:10 a=A5OVakUREuEA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=rJkE3RaqiGZ5pbrm-msn:22 a=EUspDBNiAAAA:8 a=NDwzWBFMEALbooAduq4A:9 a=QEXdDO2ut3YA:10 a=TPnrazJqx2CeVZ-ItzZ-: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=2026-04-14_03,2026-04-13_04,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 spamscore=0 bulkscore=0 priorityscore=1501 impostorscore=0 clxscore=1015 malwarescore=0 phishscore=0 adultscore=0 suspectscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2604070000 definitions=main-2604140142 On 4/2/26 12:52 PM, Anup Kulkarni wrote: > 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 > --- Acked-by: Konrad Dybcio Konrad