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Tue, 23 Dec 2025 09:08:15 -0800 (PST) Received: from hu-spratap-hyd.qualcomm.com ([202.46.22.19]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2a2f3d5d863sm130019325ad.80.2025.12.23.09.08.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 23 Dec 2025 09:08:15 -0800 (PST) From: Shivendra Pratap Date: Tue, 23 Dec 2025 22:37:34 +0530 Subject: [PATCH v18 03/10] power: reset: reboot-mode: Add support for predefined reboot modes Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20251223-arm-psci-system_reset2-vendor-reboots-v18-3-32fa9e76efc3@oss.qualcomm.com> References: <20251223-arm-psci-system_reset2-vendor-reboots-v18-0-32fa9e76efc3@oss.qualcomm.com> In-Reply-To: <20251223-arm-psci-system_reset2-vendor-reboots-v18-0-32fa9e76efc3@oss.qualcomm.com> To: Lorenzo Pieralisi , Arnd Bergmann , Bjorn Andersson , Sebastian Reichel , Rob Herring , Sudeep Holla , Souvik Chakravarty , Krzysztof Kozlowski , Andy Yan , Bartosz Golaszewski Cc: Florian Fainelli , Krzysztof Kozlowski , Dmitry Baryshkov , Mukesh Ojha , Andre Draszik , Kathiravan Thirumoorthy , linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-arm-msm@vger.kernel.org, Shivendra Pratap , Srinivas Kandagatla X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=ed25519-sha256; t=1766509672; l=5544; i=shivendra.pratap@oss.qualcomm.com; s=20250710; h=from:subject:message-id; bh=EwcxR/RujuDEpRybikjE1BbpDVQI9UxyV0ysyUeOLxE=; b=k0L6kc/W6ljfBJPxAe+iBCBIK2dumAtN+LIGDVzfVBr87lfwWKHECVyHSAazU5HMEKCsxDTqJ 8W2Eiwi72HnB2I0oUhcB8wVNTPjEOpMwbzeoBYJv0zY0ko6WlRNP0Vb X-Developer-Key: i=shivendra.pratap@oss.qualcomm.com; a=ed25519; pk=CpsuL7yZ8NReDPhGgq6Xn/SRoa59mAvzWOW0QZoo4gw= X-Proofpoint-ORIG-GUID: hVRrTLxWONT7EfkjF_y4XFij2iSWCZrm X-Proofpoint-GUID: hVRrTLxWONT7EfkjF_y4XFij2iSWCZrm X-Authority-Analysis: v=2.4 cv=aOf9aL9m c=1 sm=1 tr=0 ts=694acc80 cx=c_pps a=IZJwPbhc+fLeJZngyXXI0A==:117 a=fChuTYTh2wq5r3m49p7fHw==:17 a=IkcTkHD0fZMA:10 a=wP3pNCr1ah4A:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=EUspDBNiAAAA:8 a=UVh4EkS4hOj72C4E1asA:9 a=QEXdDO2ut3YA:10 a=uG9DUKGECoFWVXl0Dc02:22 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUxMjIzMDE0MiBTYWx0ZWRfX4r6yb1Jqe2mP 4XSoMHxMT+Nq4rfH2Ty9LgjlGq1+XpwG3mp6tx742Z08p3qClon+TVhIZsEe67lsinmfWKU86AU zekY+hMlh2ljQihZiZcHKWs6qVJNaN0927WZ1wfT3+B0xYDq152wR9GL8v/ledsFqkFEoTRUay/ TOCR+k0SqJt4Z47b0kLdKVNAeknG03+qEJfp5fw/aUgMjwHrfqIn4Vc8YQnNbX7CzGUuoogX2Sg /Rrl72hgCOCYqptSujmEBocl0fcoyKOiA6d+PQpIT2MmCBDZM8skh8yuXrPWMSXqQLCf5BSrq5f t9BQOC876BLREsbQ6qLWM7FcP/8tFEQWsHFPJ43t6c0kn9GD+TuMfSwPGpV7n8aXeKBue+NoUk0 pNo3YQcinGeJySaXEm5Ev42rEkOeoomo46qsKAS35twSysJSw8yAhwKSDK7qg6bDrkFODJGFkCa gzaOGeoTCBAFHhzTqZg== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.9,FMLib:17.12.100.49 definitions=2025-12-23_04,2025-12-22_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 phishscore=0 suspectscore=0 spamscore=0 bulkscore=0 lowpriorityscore=0 malwarescore=0 priorityscore=1501 impostorscore=0 adultscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2512120000 definitions=main-2512230142 reboot-mode based drivers can define a reboot-mode by adding it under the reboot-mode node in device tree. This limits such drivers, to define any predefined reboot-modes statically within the driver and creates a dependency on device-tree. Introduce a list for predefined modes in the reboot-mode framework and process the predefined reboot-modes along with the device-tree defined reboot-modes. Modify existing reboot-mode based drivers to initialize the predefined list-head as empty. This patch enables a reboot mode driver to define reboot-modes through a predefined static list, in addition to the device-tree based reboot-modes. Signed-off-by: Shivendra Pratap --- drivers/power/reset/nvmem-reboot-mode.c | 1 + drivers/power/reset/qcom-pon.c | 1 + drivers/power/reset/reboot-mode.c | 28 ++++++++++++++++++++++------ drivers/power/reset/syscon-reboot-mode.c | 1 + include/linux/reboot-mode.h | 9 +++++++++ 5 files changed, 34 insertions(+), 6 deletions(-) diff --git a/drivers/power/reset/nvmem-reboot-mode.c b/drivers/power/reset/= nvmem-reboot-mode.c index b3d21d39b0f732254c40103db1b51fb7045ce344..b02a2af31aac52cb0ab19cf5d4d= 315d17c208f6e 100644 --- a/drivers/power/reset/nvmem-reboot-mode.c +++ b/drivers/power/reset/nvmem-reboot-mode.c @@ -44,6 +44,7 @@ static int nvmem_reboot_mode_probe(struct platform_device= *pdev) =20 nvmem_rbm->reboot.dev =3D &pdev->dev; nvmem_rbm->reboot.write =3D nvmem_reboot_mode_write; + INIT_LIST_HEAD(&nvmem_rbm->reboot.predefined_modes); =20 nvmem_rbm->cell =3D devm_nvmem_cell_get(&pdev->dev, "reboot-mode"); if (IS_ERR(nvmem_rbm->cell)) { diff --git a/drivers/power/reset/qcom-pon.c b/drivers/power/reset/qcom-pon.c index ccce1673b2ec47d02524edd44811d4f528c243e8..bf7b9f0bcdcc4c168aa7ff8d649= 4122d898814b5 100644 --- a/drivers/power/reset/qcom-pon.c +++ b/drivers/power/reset/qcom-pon.c @@ -75,6 +75,7 @@ static int qcom_pon_probe(struct platform_device *pdev) pon->reboot_mode.dev =3D &pdev->dev; pon->reason_shift =3D reason_shift; pon->reboot_mode.write =3D qcom_pon_reboot_mode_write; + INIT_LIST_HEAD(&pon->reboot_mode.predefined_modes); error =3D devm_reboot_mode_register(&pdev->dev, &pon->reboot_mode); if (error) { dev_err(&pdev->dev, "can't register reboot mode\n"); diff --git a/drivers/power/reset/reboot-mode.c b/drivers/power/reset/reboot= -mode.c index 54adcda57e44edf2fd2cda0f752226f747aa72d7..c17c61f47f069b96a9b38699de7= 1dc1f30a807c5 100644 --- a/drivers/power/reset/reboot-mode.c +++ b/drivers/power/reset/reboot-mode.c @@ -15,12 +15,6 @@ =20 #define PREFIX "mode-" =20 -struct mode_info { - const char *mode; - u64 magic; - struct list_head list; -}; - static u64 get_reboot_mode_magic(struct reboot_mode_driver *reboot, const = char *cmd) { const char *normal =3D "normal"; @@ -71,6 +65,7 @@ static int reboot_mode_notify(struct notifier_block *this, */ int reboot_mode_register(struct reboot_mode_driver *reboot) { + struct mode_info *info_predef; struct mode_info *info; struct mode_info *next; struct property *prop; @@ -82,6 +77,9 @@ int reboot_mode_register(struct reboot_mode_driver *reboo= t) =20 INIT_LIST_HEAD(&reboot->head); =20 + if (!np) + goto predefined_modes; + for_each_property_of_node(np, prop) { if (strncmp(prop->name, PREFIX, len)) continue; @@ -123,6 +121,24 @@ int reboot_mode_register(struct reboot_mode_driver *re= boot) list_add_tail(&info->list, &reboot->head); } =20 +predefined_modes: + list_for_each_entry(info_predef, &reboot->predefined_modes, list) { + info =3D kzalloc(sizeof(*info), GFP_KERNEL); + if (!info) { + ret =3D -ENOMEM; + goto error; + } + + info->mode =3D kstrdup_const(info_predef->mode, GFP_KERNEL); + if (!info->mode) { + ret =3D -ENOMEM; + goto error; + } + + info->magic =3D info_predef->magic; + list_add_tail(&info->list, &reboot->head); + } + reboot->reboot_notifier.notifier_call =3D reboot_mode_notify; register_reboot_notifier(&reboot->reboot_notifier); =20 diff --git a/drivers/power/reset/syscon-reboot-mode.c b/drivers/power/reset= /syscon-reboot-mode.c index eb7fc5b7d6a7ed8a833d4920991c4c40b5b13ca7..74e2e14c5d87c54ac24ef63c790= 5b3266d736439 100644 --- a/drivers/power/reset/syscon-reboot-mode.c +++ b/drivers/power/reset/syscon-reboot-mode.c @@ -50,6 +50,7 @@ static int syscon_reboot_mode_probe(struct platform_devic= e *pdev) syscon_rbm->reboot.dev =3D &pdev->dev; syscon_rbm->reboot.write =3D syscon_reboot_mode_write; syscon_rbm->mask =3D 0xffffffff; + INIT_LIST_HEAD(&syscon_rbm->reboot.predefined_modes); =20 syscon_rbm->map =3D syscon_node_to_regmap(pdev->dev.parent->of_node); if (IS_ERR(syscon_rbm->map)) diff --git a/include/linux/reboot-mode.h b/include/linux/reboot-mode.h index a359dc0c6dede0ac5ce67190a00d46a7e7856707..bddec9b7f94187dcb056540df79= eea34c25b1d0d 100644 --- a/include/linux/reboot-mode.h +++ b/include/linux/reboot-mode.h @@ -4,11 +4,20 @@ =20 #include #include +#include #include =20 +struct mode_info { + const char *mode; + u64 magic; + struct list_head list; +}; + struct reboot_mode_driver { struct device *dev; struct list_head head; + /* List of predefined reboot-modes, a reboot-mode-driver may populate. */ + struct list_head predefined_modes; int (*write)(struct reboot_mode_driver *reboot, u64 magic); struct notifier_block reboot_notifier; }; --=20 2.34.1