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[78.88.45.245]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-ba1773c381bsm33817966b.40.2026.04.15.01.56.29 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 15 Apr 2026 01:56:30 -0700 (PDT) Message-ID: <64ddaf47-d780-4058-9788-7e734a7070a0@oss.qualcomm.com> Date: Wed, 15 Apr 2026 10:56:28 +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: Dmitry Baryshkov Cc: 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, mukesh.savaliya@oss.qualcomm.com, viken.dadhaniya@oss.qualcomm.com References: <20260402105253.3009382-1-anup.kulkarni@oss.qualcomm.com> <9cf3b035-79c0-4e9b-8ab6-a81f8d27728f@oss.qualcomm.com> Content-Language: en-US From: Konrad Dybcio In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Authority-Analysis: v=2.4 cv=WKhPmHsR c=1 sm=1 tr=0 ts=69df52c1 cx=c_pps a=oc9J++0uMp73DTRD5QyR2A==:117 a=FpWmc02/iXfjRdCD7H54yg==:17 a=IkcTkHD0fZMA:10 a=A5OVakUREuEA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=yx91gb_oNiZeI1HMLzn7:22 a=EUspDBNiAAAA:8 a=WNm122a_XVfSPSTBZdMA:9 a=QEXdDO2ut3YA:10 a=iYH6xdkBrDN1Jqds4HTS:22 X-Proofpoint-ORIG-GUID: Xnr3REwwMQ5_DUhY1uIpFd8UIqUjSyZk X-Proofpoint-GUID: Xnr3REwwMQ5_DUhY1uIpFd8UIqUjSyZk X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNDE1MDA4MSBTYWx0ZWRfXyTzDIj7UwRTd 25tDOatGTPnTgXo0IchsnbKK6QnlIJlq+lgNVv+VrxxrRtZmsnc9YgpHxO/gcpcbe+CyGu17XWa x4ycRlvdh0cBzKQJtNiG/8WQoc8bQ4B/e0syOZmQJHLprYC699Rxmi/rm67Ao5nCNjLOirwzcUU Acob37RVQFfTFBV4bUK7gdIQPqk6jUKpGseyRQADk0XfXh4tJT2QfhtEguzhu8xOEqDUbq9JYJo h2GLudaElaDc6sdt+m1FDFhhvyIKes0A+kZsMNdJinNo0m/MRQqmAmmO7qneBC9lXkJnHkX5CZF 804LkaETSKK9c614W9shUhpjL4W2nZn32UcgHBmEpXFLS/cXBz0t031kqb1hvo5UwMhOC5XAWUo EgoxN35fFFDHV0Thp0ntAsZQUP0mei06qakuAcLa4ka8tnxSVY8AwakX2medq8UH7wgawJkscU0 iAlelRQrbqismuNlJWw== 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_04,2026-04-13_04,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 spamscore=0 adultscore=0 phishscore=0 suspectscore=0 bulkscore=0 impostorscore=0 priorityscore=1501 lowpriorityscore=0 malwarescore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2604070000 definitions=main-2604150081 On 4/14/26 8:09 PM, Dmitry Baryshkov wrote: > On Tue, Apr 14, 2026 at 06:20:14PM +0200, Konrad Dybcio wrote: >> On 4/14/26 6:08 PM, Dmitry Baryshkov wrote: >>> On Thu, Apr 02, 2026 at 04:22:53PM +0530, 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. >>> >>> Missing platform name in the subject. >>> >>>> >>>> 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 { >>> >>> Why is it being described as a hog rather than a pinctrl used by the >>> CAN device? >> >> My understanding is that the CAN bus is managed by SAIL ("RTSS") > > So, Linux can affect what is being required for the safety island? Seems that way! Konrad