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[78.88.45.245]) by smtp.gmail.com with ESMTPSA id 4fb4d7f45d1cf-670702eec2bsm3136532a12.5.2026.04.14.09.20.15 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 14 Apr 2026 09:20:17 -0700 (PDT) Message-ID: <9cf3b035-79c0-4e9b-8ab6-a81f8d27728f@oss.qualcomm.com> Date: Tue, 14 Apr 2026 18:20:14 +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 , Anup Kulkarni Cc: 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> 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=69de6945 cx=c_pps a=50t2pK5VMbmlHzFWWp8p/g==: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=u2dJk7Tg5QFwAKt5hE8A:9 a=QEXdDO2ut3YA:10 a=IoWCM6iH3mJn3m4BftBB:22 X-Proofpoint-ORIG-GUID: ogQ9valf2Z1cXR7gzTjRIcgxReXXOD-G X-Proofpoint-GUID: ogQ9valf2Z1cXR7gzTjRIcgxReXXOD-G X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNDE0MDE1MyBTYWx0ZWRfX/eAMqI/Muvch NIs6ocBXMmJcq8/3cgb3WnG4fXKDFKeg80OLSCij4Vpr3dGFmhgDBBDIXt2mn5qCPsSoDX543rK z/FpErS+NV5l03O0x5ie4JLpxj1n+uyE6ibvaj9EOxArNvY6weWc9oc0VPWspFXrZf54DPSrOBu NAxxo+rru9RGrdkujZVUMAKluiz7FN8cS7K6DD9/m04WfXG86UzY18HlXbv3+aSLs7sAPDV2wsH lcC/oSQLiL6rIU2UIMd4opRiz04sHoiuCUTOFw5+GQ+0wqqLU7OZsAxI/TWrrmo5UXpFo0xuoSw Eh/dyKSUOgluH3yObz9aGjNEz9+mpGA7l2kGR2MBKUV//sxzva2x8mYCUikRPgruXgR8y1576wp yVygMiPUGUkbAa1r3DmUhNZChkl5pugkMteBeyj9GOyibCweTZYMUKsY3mEHWAjf6Gx1gBgCaYG CEavGIW8PmayJImbMjg== 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 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-2604140153 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") Konrad