From patchwork Thu Dec 30 18:06:01 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sander Vanheule X-Patchwork-Id: 529064 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7DAB7C4332F for ; Thu, 30 Dec 2021 18:06:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241620AbhL3SGY (ORCPT ); Thu, 30 Dec 2021 13:06:24 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59268 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S241626AbhL3SGW (ORCPT ); Thu, 30 Dec 2021 13:06:22 -0500 Received: from polaris.svanheule.net (polaris.svanheule.net [IPv6:2a00:c98:2060:a004:1::200]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A4AADC061747 for ; Thu, 30 Dec 2021 10:06:19 -0800 (PST) Received: from terra.local.svanheule.net (unknown [IPv6:2a02:a03f:eafe:c901:a9e6:6f2a:78f1:2f3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) (Authenticated sender: sander@svanheule.net) by polaris.svanheule.net (Postfix) with ESMTPSA id 7933828A0E7; Thu, 30 Dec 2021 19:06:16 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=svanheule.net; s=mail1707; t=1640887576; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=dGj3YaXaI0HU4mQ6kyQqrXDJPLCNvz7W06S9IzY/Nzo=; b=I2Ai4GZN8LoAL21Qf62aeFieQYJ62ATMnemURKbF/AwNSdG7q5WBe7wuUvhxHUE7FhCAmr OCLNF4zW6FVVbZwuqm8dQk5aV/W/P5NPYUv6RH1nOZ47EYmbura3ylUeJqGNIl2l5g9I3k KH5jzwD94w6aCB5bzW2mBzZnw8fH/CusVq5WYi887BjsoZie+VdXAs1IPpo3uniBi+a4wL vrusP1IpGco30L0WOglCAnCE1yEITWrg36Gxo/lf/as7kkVDJClCihkqNUxEhxXxgs6rRP z8KfTN+JmKQkVZn1SOT/MpjHtmqSCZmt2JawqB43chQ7EWFO4GbVCHMx1rfStA== From: Sander Vanheule To: linux-pm@vger.kernel.org, devicetree@vger.kernel.org Cc: Sebastian Reichel , Rob Herring , linux-kernel@vger.kernel.org, Sander Vanheule Subject: [RFC PATCH v1 1/3] dt-bindings: power: reset: Convert gpio-restart binding to schema Date: Thu, 30 Dec 2021 19:06:01 +0100 Message-Id: X-Mailer: git-send-email 2.33.1 In-Reply-To: References: MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org Convert the gpio-restart binding from plain text format to a schema binding, maintaining the original content and updating formatting where required. Signed-off-by: Sander Vanheule --- .../bindings/power/reset/gpio-restart.txt | 54 ----------- .../bindings/power/reset/gpio-restart.yaml | 92 +++++++++++++++++++ 2 files changed, 92 insertions(+), 54 deletions(-) delete mode 100644 Documentation/devicetree/bindings/power/reset/gpio-restart.txt create mode 100644 Documentation/devicetree/bindings/power/reset/gpio-restart.yaml diff --git a/Documentation/devicetree/bindings/power/reset/gpio-restart.txt b/Documentation/devicetree/bindings/power/reset/gpio-restart.txt deleted file mode 100644 index af3701bc15c4..000000000000 --- a/Documentation/devicetree/bindings/power/reset/gpio-restart.txt +++ /dev/null @@ -1,54 +0,0 @@ -Drive a GPIO line that can be used to restart the system from a restart -handler. - -This binding supports level and edge triggered reset. At driver load -time, the driver will request the given gpio line and install a restart -handler. If the optional properties 'open-source' is not found, the GPIO line -will be driven in the inactive state. Otherwise its not driven until -the restart is initiated. - -When the system is restarted, the restart handler will be invoked in -priority order. The gpio is configured as an output, and driven active, -triggering a level triggered reset condition. This will also cause an -inactive->active edge condition, triggering positive edge triggered -reset. After a delay specified by active-delay, the GPIO is set to -inactive, thus causing an active->inactive edge, triggering negative edge -triggered reset. After a delay specified by inactive-delay, the GPIO -is driven active again. After a delay specified by wait-delay, the -restart handler completes allowing other restart handlers to be attempted. - -Required properties: -- compatible : should be "gpio-restart". -- gpios : The GPIO to set high/low, see "gpios property" in - Documentation/devicetree/bindings/gpio/gpio.txt. If the pin should be - low to reset the board set it to "Active Low", otherwise set - gpio to "Active High". - -Optional properties: -- open-source : Treat the GPIO as being open source and defer driving - it to when the restart is initiated. If this optional property is not - specified, the GPIO is initialized as an output in its inactive state. -- priority : A priority ranging from 0 to 255 (default 128) according to - the following guidelines: - 0: Restart handler of last resort, with limited restart - capabilities - 128: Default restart handler; use if no other restart handler is - expected to be available, and/or if restart functionality is - sufficient to restart the entire system - 255: Highest priority restart handler, will preempt all other - restart handlers -- active-delay: Delay (default 100) to wait after driving gpio active [ms] -- inactive-delay: Delay (default 100) to wait after driving gpio inactive [ms] -- wait-delay: Delay (default 3000) to wait after completing restart - sequence [ms] - -Examples: - -gpio-restart { - compatible = "gpio-restart"; - gpios = <&gpio 4 0>; - priority = <128>; - active-delay = <100>; - inactive-delay = <100>; - wait-delay = <3000>; -}; diff --git a/Documentation/devicetree/bindings/power/reset/gpio-restart.yaml b/Documentation/devicetree/bindings/power/reset/gpio-restart.yaml new file mode 100644 index 000000000000..6a1f4aeebf49 --- /dev/null +++ b/Documentation/devicetree/bindings/power/reset/gpio-restart.yaml @@ -0,0 +1,92 @@ +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/power/reset/gpio-restart.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: GPIO-driven system restart + +maintainers: + - TODO + +description: + Drive a GPIO line that can be used to restart the system from a restart + handler. + + This binding supports level and edge triggered reset. At driver load time, + the driver will request the given gpio line and install a restart handler. If + the optional properties 'open-source' is not found, the GPIO line will be + driven in the inactive state. Otherwise its not driven until the restart is + initiated. + + When the system is restarted, the restart handler will be invoked in priority + order. The gpio is configured as an output, and driven active, triggering a + level triggered reset condition. This will also cause an inactive->active + edge condition, triggering positive edge triggered reset. After a delay + specified by active-delay, the GPIO is set to inactive, thus causing an + active->inactive edge, triggering negative edge triggered reset. After a + delay specified by inactive-delay, the GPIO is driven active again. After a + delay specified by wait-delay, the restart handler completes allowing other + restart handlers to be attempted. + +properties: + compatible: + const: gpio-restart + + gpios: + maxItems: 1 + description: + The GPIO to set high/low, see "gpios property" in + Documentation/devicetree/bindings/gpio/gpio.txt. If the pin should be low + to reset the board set it to "Active Low", otherwise set gpio to "Active + High". + + open-source: + $ref: /schemas/types.yaml#/definitions/flag + description: + Treat the GPIO as being open source and defer driving it to when the + restart is initiated. If this optional property is not specified, the + GPIO is initialized as an output in its inactive state. + + priority: + $ref: /schemas/types.yaml#/definitions/uint32 + description: | + A priority ranging from 0 to 255 (default 128) according to the following + guidelines: + 0: Restart handler of last resort, with limited restart + capabilities + 128: Default restart handler; use if no other restart handler is + expected to be available, and/or if restart functionality is + sufficient to restart the entire system + 255: Highest priority restart handler, will preempt all other + restart handlers + + active-delay: + $ref: /schemas/types.yaml#/definitions/uint32 + description: Delay (default 100) to wait after driving gpio active [ms] + + inactive-delay: + $ref: /schemas/types.yaml#/definitions/uint32 + description: Delay (default 100) to wait after driving gpio inactive [ms] + + wait-delay: + $ref: /schemas/types.yaml#/definitions/uint32 + description: + Delay (default 3000) to wait after completing restart sequence [ms] + +required: + - compatible + - gpios + +additionalProperties: false + +examples: + - | + gpio-restart { + compatible = "gpio-restart"; + gpios = <&gpio 4 0>; + priority = <128>; + active-delay = <100>; + inactive-delay = <100>; + wait-delay = <3000>; + };