From: Kendall Willis <k-willis@ti.com>
To: <gregkh@linuxfoundation.org>, <jirislaby@kernel.org>,
<robh@kernel.org>, <krzk+dt@kernel.org>, <conor+dt@kernel.org>,
<vigneshr@ti.com>, <linux-kernel@vger.kernel.org>,
<linux-serial@vger.kernel.org>, <devicetree@vger.kernel.org>
Cc: <d-gole@ti.com>, <vishalm@ti.com>, <sebin.francis@ti.com>,
<msp@baylibre.com>, <khilman@baylibre.com>, <a-kaur@ti.com>,
<k-willis@ti.com>, <john.ogness@linutronix.de>,
<andriy.shevchenko@linux.intel.com>, <yujiaoliang@vivo.com>,
<b-liu@ti.com>, <u.kleine-koenig@baylibre.com>
Subject: [PATCH 0/3] serial: 8250: omap: Add wakeup support
Date: Thu, 4 Sep 2025 16:24:52 -0500 [thread overview]
Message-ID: <20250904212455.3729029-1-k-willis@ti.com> (raw)
This series adds wakeup support for the serial 8250_omap driver. On the
TI K3 AM62 family of devices, the UARTs are able to wakeup the system
from various low power modes by using I/O daisy-chaining.
The wakeup functionality is implemented by adding the pinctrl state
'wakeup' in which specific flags are set on the pins to enable wakeup
via I/O daisy-chain. If the 'wakeup' pinctrl state exists for the serial
device, the 'wakeup' pinctrl state is selected on suspend. Upon resume,
the pinctrl 'default' state is selected.
The commits "dt-bindings: serial: 8250_omap: Add wakeup pinctrl state"
and "serial: 8250: omap: Support wakeup pinctrl state on suspend" were
picked from this series [1]. The commit "dt-bindings: serial: 8250_omap:
Add wakeup pinctrl state" was updated to follow the structure of a
similar patch [2] by Markus for the m_can driver. The commit "serial:
8250: omap: Support wakeup pinctrl state on suspend" was updated to only
include s2ram functionality instead of a poweroff state.
Implementation
--------------
This series is intended to be implemented along with the following
series:
1. "pmdomain: ti_sci: Handle wakeup constraint if device has pinctrl
wakeup state": Patch which skips setting constraints for wakeup sources
that use pinctrl state 'wakeup'.
2. "serial: 8250: omap: Add wakeup support" (this series): Implements
wakeup from the UARTs for TI K3 SoCs
3. "arm64: dts: ti: k3-am62: Support Main UART wakeup": Implements the
functionality to wakeup the system from the Main UART
Testing
-------
Tested on a SK-AM62B-P1 board with all series and dependencies
implemented. Suspend/resume verified with the Main UART wakeup source
by entering a keypress on the console.
[1] https://lore.kernel.org/all/20240523075819.1285554-1-msp@baylibre.com/
[2] https://lore.kernel.org/all/20250820-topic-mcan-wakeup-source-v6-12-v9-1-0ac13f2ddd67@baylibre.com/
Kendall Willis (1):
dt-bindings: serial: 8250_omap: Update wakeup-source type property
Markus Schneider-Pargmann (2):
dt-bindings: serial: 8250_omap: Add wakeup pinctrl state
serial: 8250: omap: Support wakeup pinctrl state on suspend
.../devicetree/bindings/serial/8250_omap.yaml | 25 ++++++++++++-
drivers/tty/serial/8250/8250_omap.c | 36 +++++++++++++++++++
2 files changed, 60 insertions(+), 1 deletion(-)
base-commit: 4ac65880ebca1b68495bd8704263b26c050ac010
--
2.34.1
next reply other threads:[~2025-09-04 21:25 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-09-04 21:24 Kendall Willis [this message]
2025-09-04 21:24 ` [PATCH 1/3] dt-bindings: serial: 8250_omap: Update wakeup-source type property Kendall Willis
2025-09-05 18:38 ` Conor Dooley
2025-09-05 18:48 ` Dhruva Gole
2025-09-09 9:05 ` Markus Schneider-Pargmann
2025-09-09 18:59 ` Kendall Willis
2025-09-05 20:38 ` Rob Herring
2025-09-09 19:00 ` Kendall Willis
2025-09-04 21:24 ` [PATCH 2/3] dt-bindings: serial: 8250_omap: Add wakeup pinctrl state Kendall Willis
2025-09-05 20:41 ` Rob Herring
2025-09-09 21:26 ` Kendall Willis
2025-09-04 21:24 ` [PATCH 3/3] serial: 8250: omap: Support wakeup pinctrl state on suspend Kendall Willis
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