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Mon, 3 Mar 2025 21:09:15 GMT Received: from hu-eberman-lv.qualcomm.com (10.49.16.6) by nasanex01b.na.qualcomm.com (10.46.141.250) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.9; Mon, 3 Mar 2025 13:09:15 -0800 From: Elliot Berman Date: Mon, 3 Mar 2025 13:08:30 -0800 Subject: [PATCH v9 1/5] dt-bindings: arm: Document reboot mode magic Precedence: bulk X-Mailing-List: linux-pm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-ID: <20250303-arm-psci-system_reset2-vendor-reboots-v9-1-b2cf4a20feda@oss.qualcomm.com> References: <20250303-arm-psci-system_reset2-vendor-reboots-v9-0-b2cf4a20feda@oss.qualcomm.com> In-Reply-To: <20250303-arm-psci-system_reset2-vendor-reboots-v9-0-b2cf4a20feda@oss.qualcomm.com> To: Bjorn Andersson , Sebastian Reichel , Rob Herring , Conor Dooley , Vinod Koul , Andy Yan , Lorenzo Pieralisi , "Mark Rutland" , Bartosz Golaszewski , Arnd Bergmann , "Olof Johansson" , Catalin Marinas , "Will Deacon" , , "Krzysztof Kozlowski" , Konrad Dybcio , Konrad Dybcio CC: Srinivas Kandagatla , "Satya Durga Srinivasu Prabhala" , Melody Olvera , Shivendra Pratap , , , , Florian Fainelli , Stephen Boyd , , , Elliot Berman , Elliot Berman , "Elliot Berman" X-Mailer: b4 0.14.2 X-ClientProxiedBy: nalasex01b.na.qualcomm.com (10.47.209.197) To nasanex01b.na.qualcomm.com (10.46.141.250) X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-ORIG-GUID: 6D23_rx6Hp6Psl2m1QPn856dPH_97aKO X-Proofpoint-GUID: 6D23_rx6Hp6Psl2m1QPn856dPH_97aKO X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1093,Hydra:6.0.680,FMLib:17.12.68.34 definitions=2025-03-03_10,2025-03-03_04,2024-11-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 mlxlogscore=999 mlxscore=0 lowpriorityscore=0 suspectscore=0 priorityscore=1501 clxscore=1011 spamscore=0 adultscore=0 impostorscore=0 malwarescore=0 phishscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2502100000 definitions=main-2503030163 From: Elliot Berman Add bindings to describe vendor-specific reboot modes. Values here correspond to valid parameters to vendor-specific reset types in PSCI SYSTEM_RESET2 call. Reviewed-by: Rob Herring (Arm) Signed-off-by: Elliot Berman --- Documentation/devicetree/bindings/arm/psci.yaml | 43 +++++++++++++++++++++++++ 1 file changed, 43 insertions(+) diff --git a/Documentation/devicetree/bindings/arm/psci.yaml b/Documentation/devicetree/bindings/arm/psci.yaml index cbb012e217ab80c1ca88e611e7acc06c6d56fad0..5e07c62fe5d74a8d001f6b8a8c9e777f43f3113f 100644 --- a/Documentation/devicetree/bindings/arm/psci.yaml +++ b/Documentation/devicetree/bindings/arm/psci.yaml @@ -98,6 +98,27 @@ properties: [1] Kernel documentation - ARM idle states bindings Documentation/devicetree/bindings/cpu/idle-states.yaml + reset-types: + type: object + $ref: /schemas/power/reset/reboot-mode.yaml# + unevaluatedProperties: false + properties: + # "mode-normal" is just SYSTEM_RESET + mode-normal: false + patternProperties: + "^mode-.*$": + minItems: 1 + maxItems: 2 + description: | + Describes a vendor-specific reset type. The string after "mode-" + maps a reboot mode to the parameters in the PSCI SYSTEM_RESET2 call. + + Parameters are named mode-xxx = , where xxx + is the name of the magic reboot mode, type is the lower 31 bits + of the reset_type, and, optionally, the cookie value. If the cookie + is not provided, it is defaulted to zero. + The 31st bit (vendor-resets) will be implicitly set by the driver. + patternProperties: "^power-domain-": $ref: /schemas/power/power-domain.yaml# @@ -137,6 +158,15 @@ allOf: required: - cpu_off - cpu_on + - if: + not: + properties: + compatible: + contains: + const: arm,psci-1.0 + then: + properties: + reset-types: false additionalProperties: false @@ -261,4 +291,17 @@ examples: domain-idle-states = <&CLUSTER_RET>, <&CLUSTER_PWRDN>; }; }; + + - |+ + + // Case 5: SYSTEM_RESET2 vendor resets + psci { + compatible = "arm,psci-1.0"; + method = "smc"; + + reset-types { + mode-edl = <0>; + mode-bootloader = <1 2>; + }; + }; ...