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Thu, 03 Sep 2026 02:37:14 -0700 (PDT) X-Received: by 2002:a05:620a:489c:b0:939:6c63:a7da with SMTP id af79cd13be357-9396c63c202mr504115385a.0.1788428233634; Thu, 03 Sep 2026 02:37:13 -0700 (PDT) Received: from [192.168.202.12] ([178.235.128.140]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-c25f424528esm72013266b.59.2026.09.03.02.37.10 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 03 Sep 2026 02:37:12 -0700 (PDT) Message-ID: Date: Thu, 3 Sep 2026 11:37:09 +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 v2 01/16] arm64: dts: qcom: x1-crd: Mark the EC reset gpio as reserved To: Abel Vesa Cc: Bjorn Andersson , Konrad Dybcio , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Rajendra Nayak , Abel Vesa , Sibi Sankar , Marc Zyngier , Aleksandrs Vinarskis , Konstantin Shabanov , Srinivas Kandagatla , Ettore Chimenti , Georg Gottleuber , Xilin Wu , Bryan O'Donoghue , Val Packett , Laurentiu Tudor , Jens Glathe , Dale Whinham , =?UTF-8?Q?J=C3=A9r=C3=B4me_de_Bretagne?= , Harrison Vanderbyl , linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Konrad Dybcio References: <20260901-dts-qcom-hamoa-reserve-ec-reset-gpio-v2-0-f4ab7e4bb75d@oss.qualcomm.com> <20260901-dts-qcom-hamoa-reserve-ec-reset-gpio-v2-1-f4ab7e4bb75d@oss.qualcomm.com> <3f26bf2d-19de-4cc3-8af2-c26601da2576@oss.qualcomm.com> <182336df-b505-4ae4-901f-e09c0eae80ed@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=H4/rBeYi c=1 sm=1 tr=0 ts=6a993fca cx=c_pps a=HLyN3IcIa5EE8TELMZ618Q==:117 a=PRfkaYvzSr8QmIIGAkY2Sg==:17 a=IkcTkHD0fZMA:10 a=VdqzKS8jKosA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=ZpdpYltYx_vBUK5n70dp:22 a=Ox6tuOH3-mkVs-antacA:9 a=QEXdDO2ut3YA:10 a=bTQJ7kPSJx9SKPbeHEYW:22 X-Proofpoint-GUID: ATiBecbpWWSl1LAL_u-SVHcGhcuJOeqF X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwOTAzMDA4MyBTYWx0ZWRfXzOvDcAo6ey/4 K2SQOjzqj1HJuLEhXCxXYGd8PV4czN4Arl2NI7NfHfLw2QMWSYriOQnd5hlFsSAjNl7YYX03hHj OSwHjy+UWxU4bXpQc47l7Urn0ZDTk+GZfctfAJfLhHkrsMa87YXAkcwmIA73njvR4JyDEw6RY2Q USr4MPpvAVx2MBJIZcsBkN8a/eDklZ5FfUc/s7C0FBbgBT5o8DOIhu8k5FpZ1I83xT3V2qI3GPw msiO6uCnNGpUyf0sXeJWoLOuG1vZFvyM4zLme0fQhMhmdJG5mtRc7/dizrEYppmwVRZ6IpKzmAK qNbE6IdT+WTLSJzUWfWWwtGJucCvdqksaX20EuxwOyaF76btVAAPFoZ9CbgbG97jRoD9PAzMS94 byaZpCWd20623Ckj7bbhIazCTUsnpMDyfKwjowYHMdDAjDNUuitovjnRH/JSewWfNCYGdnBFDEG hhtFglchBBHOQRWpZMg== X-Proofpoint-Spam-Info: AW1haW4tMjYwOTAzMDA4MyBTYWx0ZWRfX3hDOtQZDJSrS Rf0fkt+759EjqKgEhMg+oMW+8eHCRYGjSwBBSIhRWME8dtmQGNkABZ+KDTZHRpp53G5FMfRCYjh le/h6bgTnHhIPjUSUVV5wVh8FKPDocE= X-Proofpoint-ORIG-GUID: ATiBecbpWWSl1LAL_u-SVHcGhcuJOeqF X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-09-03_02,2026-09-03_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 priorityscore=1501 adultscore=0 bulkscore=0 clxscore=1015 malwarescore=0 spamscore=0 phishscore=0 impostorscore=0 suspectscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2609030083 On 9/3/26 11:29 AM, Abel Vesa wrote: > On 26-09-03 11:16:20, Konrad Dybcio wrote: >> On 9/3/26 10:34 AM, Abel Vesa wrote: >>> On 26-09-02 17:53:23, Konrad Dybcio wrote: >>>> On 9/1/26 10:06 AM, Abel Vesa wrote: >>>>> GPIO 65 from TLMM is used by the embedded controller as its reset line. >>>>> >>>>> On some devices, toggling the embedded controller reset line makes the >>>>> device not power up at all, unless the battery is unplugged. >>>> >>>> Have you confirmed that behavior on the CRD? >>> >>> Toggling it does nothing observable. >>> >>> However, the documentation says this GPIO is actually tied to EC reset. >>> >>> I still think we should reserve it, just to be safe. >>> >>> What do you think? >> >> I believe that contradicts the reasoning you gave in the commit >> message then.. > > Yep, will rephrase it for this platform as: > > While toggling it from linux doesn't seem to have any observable impact, > since documentation does confrm it is connected to EC reset, lets reserve > it just to be on the safe side. Have you toggled the pin into the correct polarity? The EC FW seems not to be handling that pin at all, so I'm guessing it should be just a dumb chip reset Konrad