[PATCH v2 0/5] serial: 8250: omap: Add am62 wakeup support

[PATCH v2 0/5] serial: 8250: omap: Add am62 wakeup support

[Markus Schneider-Pargmann]

Hi,

v2
--

In Version 2 I removed the Partial-IO specific patches as these can't be
tested due to power issues in Partial-IO on am62-lp-sk and similar
boards.

I added a patch to add DT 'wakeup-source' support.

Series
------

To support wakeup from several low power modes on am62, don't always
enable device wakeup. Instead only set it to wakeup capable. A
devicetree property 'wakeup-source' can be used to enable wakeup. The
user is also able to control if wakeup is enabled through sysfs.

Base
----
v6.11-rc1

Tests
-----
I tested these patches on am62-lp-sk.

Previous versions
-----------------
v1: https://lore.kernel.org/lkml/20240523075819.1285554-1-msp@baylibre.com/

Changes in v2
-------------
 - Remove Partial-IO patches
 - Replace device_init_wakeup with device_set_wakeup_capable in
   omap8250_remove as well

Best,
Markus

Markus Schneider-Pargmann (5):
  dt-bindings: serial: 8250_omap: Add wakeup-source property
  serial: 8250: omap: Remove unused wakeups_enabled
  serial: 8250: omap: Cleanup on error in request_irq
  serial: 8250: omap: Set wakeup capable, do not enable
  serial: 8250: omap: Parse DT wakeup-source proerty

 .../devicetree/bindings/serial/8250_omap.yaml          |  1 +
 drivers/tty/serial/8250/8250_omap.c                    | 10 ++++++----
 2 files changed, 7 insertions(+), 4 deletions(-)

-- 
2.45.2

[PATCH v2 1/5] dt-bindings: serial: 8250_omap: Add wakeup-source property

[Markus Schneider-Pargmann]

Add the wakeup-source to enable this device as a wakeup source if
defined in DT.

Signed-off-by: Markus Schneider-Pargmann <msp@baylibre.com>
---
 Documentation/devicetree/bindings/serial/8250_omap.yaml | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Documentation/devicetree/bindings/serial/8250_omap.yaml b/Documentation/devicetree/bindings/serial/8250_omap.yaml
index 6a7be42da523..4b78de6b46a2 100644
--- a/Documentation/devicetree/bindings/serial/8250_omap.yaml
+++ b/Documentation/devicetree/bindings/serial/8250_omap.yaml
@@ -76,6 +76,7 @@ properties:
   clock-frequency: true
   current-speed: true
   overrun-throttle-ms: true
+  wakeup-source: true
 
 required:
   - compatible
-- 
2.45.2

[PATCH v2 2/5] serial: 8250: omap: Remove unused wakeups_enabled

[Markus Schneider-Pargmann]

This field seems to be unused for quite some time already. Remove it.

Signed-off-by: Markus Schneider-Pargmann <msp@baylibre.com>
---
 drivers/tty/serial/8250/8250_omap.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/tty/serial/8250/8250_omap.c b/drivers/tty/serial/8250/8250_omap.c
index 1af9aed99c65..02d4f3073696 100644
--- a/drivers/tty/serial/8250/8250_omap.c
+++ b/drivers/tty/serial/8250/8250_omap.c
@@ -144,7 +144,6 @@ struct omap8250_priv {
 	atomic_t active;
 	bool is_suspending;
 	int wakeirq;
-	int wakeups_enabled;
 	u32 latency;
 	u32 calc_latency;
 	struct pm_qos_request pm_qos_request;
-- 
2.45.2

[PATCH v2 3/5] serial: 8250: omap: Cleanup on error in request_irq

[Markus Schneider-Pargmann]

If devm_request_irq fails, the code does not cleanup many things that
were setup before. Instead of directly returning ret we should jump to
err.

Fixes: fef4f600319e ("serial: 8250: omap: Fix life cycle issues for interrupt handlers")
Signed-off-by: Markus Schneider-Pargmann <msp@baylibre.com>
---
 drivers/tty/serial/8250/8250_omap.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/tty/serial/8250/8250_omap.c b/drivers/tty/serial/8250/8250_omap.c
index 02d4f3073696..01d430de9c64 100644
--- a/drivers/tty/serial/8250/8250_omap.c
+++ b/drivers/tty/serial/8250/8250_omap.c
@@ -1587,7 +1587,7 @@ static int omap8250_probe(struct platform_device *pdev)
 	ret = devm_request_irq(&pdev->dev, up.port.irq, omap8250_irq, 0,
 			       dev_name(&pdev->dev), priv);
 	if (ret < 0)
-		return ret;
+		goto err;
 
 	priv->wakeirq = irq_of_parse_and_map(np, 1);
 
-- 
2.45.2

[PATCH v2 4/5] serial: 8250: omap: Set wakeup capable, do not enable

[Markus Schneider-Pargmann]

The driver sets wakeup enable by default. But not all UARTs are meant to
be wakeup enabled. Change the default to be wakeup capable but not
enabled. The user can enable wakeup when needed.

Signed-off-by: Markus Schneider-Pargmann <msp@baylibre.com>
Acked-by: Kevin Hilman <khilman@baylibre.com>
Reviewed-by: Kevin Hilman <khilman@baylibre.com>
---
 drivers/tty/serial/8250/8250_omap.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/tty/serial/8250/8250_omap.c b/drivers/tty/serial/8250/8250_omap.c
index 01d430de9c64..7a6dfd40af9e 100644
--- a/drivers/tty/serial/8250/8250_omap.c
+++ b/drivers/tty/serial/8250/8250_omap.c
@@ -1529,7 +1529,7 @@ static int omap8250_probe(struct platform_device *pdev)
 
 	platform_set_drvdata(pdev, priv);
 
-	device_init_wakeup(&pdev->dev, true);
+	device_set_wakeup_capable(&pdev->dev, true);
 	pm_runtime_enable(&pdev->dev);
 	pm_runtime_use_autosuspend(&pdev->dev);
 
@@ -1628,7 +1628,7 @@ static void omap8250_remove(struct platform_device *pdev)
 	flush_work(&priv->qos_work);
 	pm_runtime_disable(&pdev->dev);
 	cpu_latency_qos_remove_request(&priv->pm_qos_request);
-	device_init_wakeup(&pdev->dev, false);
+	device_set_wakeup_capable(&pdev->dev, false);
 }
 
 static int omap8250_prepare(struct device *dev)
-- 
2.45.2

[PATCH v2 5/5] serial: 8250: omap: Parse DT wakeup-source proerty

[Markus Schneider-Pargmann]

If the wakeup-source property is present, enable wakeup from this
device.

Signed-off-by: Markus Schneider-Pargmann <msp@baylibre.com>
---
 drivers/tty/serial/8250/8250_omap.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/tty/serial/8250/8250_omap.c b/drivers/tty/serial/8250/8250_omap.c
index 7a6dfd40af9e..ccb83c05be20 100644
--- a/drivers/tty/serial/8250/8250_omap.c
+++ b/drivers/tty/serial/8250/8250_omap.c
@@ -1530,6 +1530,9 @@ static int omap8250_probe(struct platform_device *pdev)
 	platform_set_drvdata(pdev, priv);
 
 	device_set_wakeup_capable(&pdev->dev, true);
+	if (of_property_read_bool(np, "wakeup-source"))
+		device_set_wakeup_enable(&pdev->dev, true);
+
 	pm_runtime_enable(&pdev->dev);
 	pm_runtime_use_autosuspend(&pdev->dev);
 
-- 
2.45.2

Re: [PATCH v2 1/5] dt-bindings: serial: 8250_omap: Add wakeup-source property

[Conor Dooley]

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On Wed, Aug 07, 2024 at 04:12:23PM +0200, Markus Schneider-Pargmann wrote:
> Add the wakeup-source to enable this device as a wakeup source if
> defined in DT.
> 
> Signed-off-by: Markus Schneider-Pargmann <msp@baylibre.com>

Acked-by: Conor Dooley <conor.dooley@microchip.com>

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Re: [PATCH v2 0/5] serial: 8250: omap: Add am62 wakeup support

[Kevin Hilman]

Markus Schneider-Pargmann <msp@baylibre.com> writes:

> v2
> --
>
> In Version 2 I removed the Partial-IO specific patches as these can't be
> tested due to power issues in Partial-IO on am62-lp-sk and similar
> boards.
>
> I added a patch to add DT 'wakeup-source' support.
>
> Series
> ------
>
> To support wakeup from several low power modes on am62, don't always
> enable device wakeup. Instead only set it to wakeup capable. A
> devicetree property 'wakeup-source' can be used to enable wakeup. The
> user is also able to control if wakeup is enabled through sysfs.

For my low-power constraints series[1], it's also important to not have
the UART wakeups unconditionally enabled, so I like the defaults
proposed in this series.  Thanks!

I tested on k3-am62a7-sk along with my constraints changes and all is well.

Reviewed-by: Kevin Hilman <khilman@baylibre.com>
Tested-by: Kevin Hilman <khilman@baylibre.com>

Kevin

[1] https://lore.kernel.org/all/20240805-lpm-v6-10-constraints-pmdomain-v1-0-d186b68ded4c@baylibre.com/