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[78.88.45.245]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-b97f13e83c8sm166754366b.2.2026.03.18.02.33.28 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 18 Mar 2026 02:33:30 -0700 (PDT) Message-ID: Date: Wed, 18 Mar 2026 10:33:28 +0100 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 1/5] arm64: dts: qcom: x1e80100: Remove interconnect from SCM device To: Dmitry Baryshkov Cc: "Maulik Shah (mkshah)" , Bjorn Andersson , Konrad Dybcio , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Thomas Gleixner , Linus Walleij , linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-gpio@vger.kernel.org, Sneh Mankad References: <20260312-hamoa_pdc-v1-0-760c8593ce50@oss.qualcomm.com> <20260312-hamoa_pdc-v1-1-760c8593ce50@oss.qualcomm.com> <198ccf60-a4b9-438b-ad92-bc4d2cc84b83@oss.qualcomm.com> <90b3a7df-cd02-4878-b614-1499589f0906@oss.qualcomm.com> <822cc610-7984-4684-99d3-8abd679eb06d@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=bKIb4f+Z c=1 sm=1 tr=0 ts=69ba716c cx=c_pps a=7E5Bxpl4vBhpaufnMqZlrw==:117 a=FpWmc02/iXfjRdCD7H54yg==:17 a=IkcTkHD0fZMA:10 a=Yq5XynenixoA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=yx91gb_oNiZeI1HMLzn7:22 a=Hp9DdQFMGmLfbiB6PWoA:9 a=QEXdDO2ut3YA:10 a=pJ04lnu7RYOZP9TFuWaZ:22 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMzE4MDA3OSBTYWx0ZWRfX1mWjhrj3F9dU nFjdjQnkRxCOKCSAuhmSqyV1eyj/n2KQEcfiYPg3T/aiGTdJx6peEMLN2eO4DlDWEId9JHCX9y4 YGBPi2PX5WeDKKoGPHBNszKD8kx6mybk4k60RSwVWOJKnqe1j655ldgTQoPScGQQCqwGsay3cHD LjzY4XkgmJMYJ4WqMaaH/k4bflmYeOCuCZ22dAie5HdTdy1GfoMLm5ZAKRxWv7aKJzt5XksM3xk rHbs067ctEvk/b0ilhTKF5G1iU7GlOEJhbecmf8db6SVwW7knwVDp05nNRFfYCAtiQMgepXFitk dIHGsth6jqkccb2jzpU3GJiVlUOZQGkAgrnjGf9wohpT+JQ5io35Fh8Y76oPU2l4tQLvu+otPsY LApx/HQi/u4wiPsit90ap1mTCSoVFQgO6cihbTD+VmUArQor51Vl3rs8r66pVsLwEC+q8GW/8v0 aBq4Pn06gerN65xwrig== X-Proofpoint-GUID: J9YOS7_cic039XAwx05YcMA9_7o6a7O4 X-Proofpoint-ORIG-GUID: J9YOS7_cic039XAwx05YcMA9_7o6a7O4 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=2026-03-17_05,2026-03-17_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 phishscore=0 bulkscore=0 clxscore=1015 adultscore=0 impostorscore=0 suspectscore=0 lowpriorityscore=0 priorityscore=1501 spamscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2603050001 definitions=main-2603180079 On 3/16/26 3:25 PM, Dmitry Baryshkov wrote: > On Mon, Mar 16, 2026 at 10:39:09AM +0100, Konrad Dybcio wrote: >> On 3/13/26 3:48 PM, Dmitry Baryshkov wrote: >>> On Fri, Mar 13, 2026 at 12:59:46PM +0100, Konrad Dybcio wrote: >>>> On 3/13/26 11:12 AM, Maulik Shah (mkshah) wrote: >>>>> On 3/13/2026 7:41 AM, Dmitry Baryshkov wrote: >>>>>> On Thu, Mar 12, 2026 at 09:26:35PM +0530, Maulik Shah wrote: >>>> >>>>> d) Add separate SCM child device (with interconnects) under SoC. >>>> >>>> We'd then have to probe it as an aux device or something, which would >>>> either delay the probing of SCM, or introduce the need to ping-pong for >>>> PAS availability between the API provider and consumer, since some calls >>>> work perfectly fine without the ICC path, while others could really use >>>> it >>> >>> qcom_scm_pas_is_available() ? >> >> This comes back to either having to wait for the interconnect provider >> anyway, or allowing the ICC-enhanced calls to take place before they that >> happens, stripping us of the benefits. > > Yes. However this way only the PAS users will have to wait (i.e. > remoteprocs, venus, IPA, etc.). All the basic providers would be able to > probe. Do you then envision a separate qcom_scm_pil_is_available()? Konrad