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Wed, 7 Jan 2026 13:26:03 +0000 (UTC) X-Farcaster-Flow-ID: 53d8d61f-0453-4ecf-9d89-1d64c54a7498 Received: from EX19D012EUA001.ant.amazon.com (10.252.50.122) by EX19MTAEUB001.ant.amazon.com (10.252.51.26) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA) id 15.2.2562.35; Wed, 7 Jan 2026 13:26:01 +0000 Received: from EX19D012EUA001.ant.amazon.com (10.252.50.122) by EX19D012EUA001.ant.amazon.com (10.252.50.122) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA) id 15.2.2562.35; Wed, 7 Jan 2026 13:26:01 +0000 Received: from EX19D012EUA001.ant.amazon.com ([fe80::b7ea:84f7:2c4b:2719]) by EX19D012EUA001.ant.amazon.com ([fe80::b7ea:84f7:2c4b:2719%3]) with mapi id 15.02.2562.035; Wed, 7 Jan 2026 13:26:01 +0000 From: "Chalios, Babis" To: "robh@kernel.org" , "krzk+dt@kernel.org" , "conor+dt@kernel.org" , "richardcochran@gmail.com" , "dwmw2@infradead.org" , "andrew+netdev@lunn.ch" , "davem@davemloft.net" , "edumazet@google.com" , "kuba@kernel.org" , "pabeni@redhat.com" CC: "devicetree@vger.kernel.org" , "netdev@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "Chalios, Babis" , "Graf (AWS), Alexander" , "mzxreary@0pointer.de" , "Cali, Marco" , "Woodhouse, David" Subject: [PATCH v5 4/7] ptp: ptp_vmclock: Add device tree support Thread-Topic: [PATCH v5 4/7] ptp: ptp_vmclock: Add device tree support Thread-Index: AQHcf9kqLkJgPArGVUiIcSiHYNwkwQ== Date: Wed, 7 Jan 2026 13:26:01 +0000 Message-ID: <20260107132514.437-5-bchalios@amazon.es> References: <20260107132514.437-1-bchalios@amazon.es> In-Reply-To: <20260107132514.437-1-bchalios@amazon.es> Accept-Language: en-GB, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: Content-Transfer-Encoding: quoted-printable 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" From: David Woodhouse Add device tree support to the ptp_vmclock driver, allowing it to probe via device tree in addition to ACPI. Handle optional interrupt for clock disruption notifications, mirroring the ACPI notification behaviour. Signed-off-by: David Woodhouse Signed-off-by: Babis Chalios --- drivers/ptp/ptp_vmclock.c | 72 ++++++++++++++++++++++++++++++++++----- 1 file changed, 64 insertions(+), 8 deletions(-) diff --git a/drivers/ptp/ptp_vmclock.c b/drivers/ptp/ptp_vmclock.c index 38b2bacb755e..801e14cc4799 100644 --- a/drivers/ptp/ptp_vmclock.c +++ b/drivers/ptp/ptp_vmclock.c @@ -14,10 +14,13 @@ #include #include #include +#include +#include #include #include #include #include +#include #include #include =20 @@ -535,7 +538,7 @@ vmclock_acpi_notification_handler(acpi_handle __always_= unused handle, wake_up_interruptible(&st->disrupt_wait); } =20 -static int vmclock_setup_notification(struct device *dev, struct vmclock_s= tate *st) +static int vmclock_setup_acpi_notification(struct device *dev) { struct acpi_device *adev =3D ACPI_COMPANION(dev); acpi_status status; @@ -548,10 +551,6 @@ static int vmclock_setup_notification(struct device *d= ev, struct vmclock_state * if (!adev) return -ENODEV; =20 - /* The device does not support notifications. Nothing else to do */ - if (!(le64_to_cpu(st->clk->flags) & VMCLOCK_FLAG_NOTIFICATION_PRESENT)) - return 0; - status =3D acpi_install_notify_handler(adev->handle, ACPI_DEVICE_NOTIFY, vmclock_acpi_notification_handler, dev); @@ -586,6 +585,57 @@ static int vmclock_probe_acpi(struct device *dev, stru= ct vmclock_state *st) return 0; } =20 +static irqreturn_t vmclock_of_irq_handler(int __always_unused irq, void *_= st) +{ + struct vmclock_state *st =3D _st; + + wake_up_interruptible(&st->disrupt_wait); + return IRQ_HANDLED; +} + +static int vmclock_probe_dt(struct device *dev, struct vmclock_state *st) +{ + struct platform_device *pdev =3D to_platform_device(dev); + struct resource *res; + + res =3D platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) + return -ENODEV; + + st->res =3D *res; + + return 0; +} + +static int vmclock_setup_of_notification(struct device *dev) +{ + struct platform_device *pdev =3D to_platform_device(dev); + int irq; + + irq =3D platform_get_irq(pdev, 0); + if (irq < 0) + return irq; + + return devm_request_irq(dev, irq, vmclock_of_irq_handler, IRQF_SHARED, + "vmclock", dev->driver_data); +} + +static int vmclock_setup_notification(struct device *dev, + struct vmclock_state *st) +{ + /* The device does not support notifications. Nothing else to do */ + if (!(le64_to_cpu(st->clk->flags) & VMCLOCK_FLAG_NOTIFICATION_PRESENT)) + return 0; + + if (has_acpi_companion(dev)) { + return vmclock_setup_acpi_notification(dev); + } else { + return vmclock_setup_of_notification(dev); + } + +} + + static void vmclock_put_idx(void *data) { struct vmclock_state *st =3D data; @@ -606,7 +656,7 @@ static int vmclock_probe(struct platform_device *pdev) if (has_acpi_companion(dev)) ret =3D vmclock_probe_acpi(dev, st); else - ret =3D -EINVAL; /* Only ACPI for now */ + ret =3D vmclock_probe_dt(dev, st); =20 if (ret) { dev_info(dev, "Failed to obtain physical address: %d\n", ret); @@ -654,6 +704,7 @@ static int vmclock_probe(struct platform_device *pdev) return ret; =20 init_waitqueue_head(&st->disrupt_wait); + dev->driver_data =3D st; ret =3D vmclock_setup_notification(dev, st); if (ret) return ret; @@ -690,8 +741,6 @@ static int vmclock_probe(struct platform_device *pdev) return -ENODEV; } =20 - dev->driver_data =3D st; - dev_info(dev, "%s: registered %s%s%s\n", st->name, st->miscdev.minor ? "miscdev" : "", (st->miscdev.minor && st->ptp_clock) ? ", " : "", @@ -706,11 +755,18 @@ static const struct acpi_device_id vmclock_acpi_ids[]= =3D { }; MODULE_DEVICE_TABLE(acpi, vmclock_acpi_ids); =20 +static const struct of_device_id vmclock_of_ids[] =3D { + { .compatible =3D "amazon,vmclock", }, + { }, +}; +MODULE_DEVICE_TABLE(of, vmclock_of_ids); + static struct platform_driver vmclock_platform_driver =3D { .probe =3D vmclock_probe, .driver =3D { .name =3D "vmclock", .acpi_match_table =3D vmclock_acpi_ids, + .of_match_table =3D vmclock_of_ids, }, }; =20 --=20 2.34.1