From patchwork Tue May 7 20:37:42 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lina Iyer X-Patchwork-Id: 10933771 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 0BDE01398 for ; Tue, 7 May 2019 20:41:41 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id ECD8D28706 for ; Tue, 7 May 2019 20:41:40 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id DEA9B28952; Tue, 7 May 2019 20:41:40 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.7 required=2.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 653BE28706 for ; Tue, 7 May 2019 20:41:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726652AbfEGUle (ORCPT ); Tue, 7 May 2019 16:41:34 -0400 Received: from smtp.codeaurora.org ([198.145.29.96]:53042 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727128AbfEGUkz (ORCPT ); Tue, 7 May 2019 16:40:55 -0400 Received: by smtp.codeaurora.org (Postfix, from userid 1000) id 2E180609CD; Tue, 7 May 2019 20:40:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1557261655; bh=FvVIHSPF6TCOHS2vRpI1pV1Cn/7oodyF9St6quwD52M=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=hixVokxqOtjqymzXsK5Ec5PQBRTvW759zd7J0GzeK/9fK6nOgjtS48MTpgaRTXwAB lZJZu3GeGsL8/iTVRm929ZxBUyjK6/IN3PoYMPVXOXUoViUl5JJFlopUjqdUSHZ5GQ UwfUBz1X0YNBFgJBOHdWlaTafQWF/9qv+gBj59X4= Received: from codeaurora.org (i-global254.qualcomm.com [199.106.103.254]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: ilina@smtp.codeaurora.org) by smtp.codeaurora.org (Postfix) with ESMTPSA id 7176760F3F; Tue, 7 May 2019 20:40:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1557261654; bh=FvVIHSPF6TCOHS2vRpI1pV1Cn/7oodyF9St6quwD52M=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=AcWT5ESZ7Gdwdp8j3RkWJFxXVQ45sYW9TWEDE21Qk4xDJuu9Qp6bu83ttrLFLdhpW 0Jpxd2K73PUzqjSAaLTc9Jj7uyGVUrUmOR5ffs8DR5TQE00f/thVs85dV185gnpu9N rl3b/gm0SdKbmAdNXaGaqZW0ALDRi74PY+4j5+2A= DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 7176760F3F Authentication-Results: pdx-caf-mail.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: pdx-caf-mail.web.codeaurora.org; spf=none smtp.mailfrom=ilina@codeaurora.org From: Lina Iyer To: swboyd@chromium.org, evgreen@chromium.org, marc.zyngier@arm.com, linus.walleij@linaro.org Cc: linux-kernel@vger.kernel.org, rplsssn@codeaurora.org, linux-arm-msm@vger.kernel.org, thierry.reding@gmail.com, bjorn.andersson@linaro.org, dianders@chromium.org, Lina Iyer , devicetree@vger.kernel.org Subject: [PATCH v5 04/11] of: irq: document properties for wakeup interrupt parent Date: Tue, 7 May 2019 14:37:42 -0600 Message-Id: <20190507203749.3384-5-ilina@codeaurora.org> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190507203749.3384-1-ilina@codeaurora.org> References: <20190507203749.3384-1-ilina@codeaurora.org> MIME-Version: 1.0 Sender: linux-arm-msm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Some interrupt controllers in a SoC, are always powered on and have a select interrupts routed to them, so that they can wakeup the SoC from suspend. Add wakeup-parent DT property to refer to these interrupt controllers. If the interrupts routed to the wakeup parent are not sequential, than a map needs to exist to associate the same interrupt line on multiple interrupt controllers. Providing this map in every driver is cumbersome. Let's add this in the device tree and document the properties to map the interrupt specifiers Cc: devicetree@vger.kernel.org Signed-off-by: Lina Iyer --- Changes in v5: - Update documentation to describe masks in the example Changes in v4: - Added this documentation --- .../interrupt-controller/interrupts.txt | 54 +++++++++++++++++++ 1 file changed, 54 insertions(+) diff --git a/Documentation/devicetree/bindings/interrupt-controller/interrupts.txt b/Documentation/devicetree/bindings/interrupt-controller/interrupts.txt index 8a3c40829899..e3e43f5d5566 100644 --- a/Documentation/devicetree/bindings/interrupt-controller/interrupts.txt +++ b/Documentation/devicetree/bindings/interrupt-controller/interrupts.txt @@ -108,3 +108,57 @@ commonly used: sensitivity = <7>; }; }; + +3) Interrupt wakeup parent +-------------------------- + +Some interrupt controllers in a SoC, are always powered on and have a select +interrupts routed to them, so that they can wakeup the SoC from suspend. These +interrupt controllers do not fall into the category of a parent interrupt +controller and can be specified by the "wakeup-parent" property and contain a +single phandle referring to the wakeup capable interrupt controller. + + Example: + wakeup-parent = <&pdc_intc>; + + +4) Interrupt mapping +-------------------- + +Sometimes interrupts may be detected by more than one interrupt controller +(depending on which controller is active). The interrupt controllers may not +be in hierarchy and therefore the interrupt controller driver is required to +establish the relationship between the same interrupt at different interrupt +controllers. If these interrupts are not sequential then a map needs to be +specified to help identify these interrupts. + +Mapping the interrupt specifiers in the device tree can be done using the +"irqdomain-map" property. The property contains interrupt specifier at the +current interrupt controller followed by the interrupt specifier at the mapped +interrupt controller. + + irqdomain-map = + +The optional properties "irqdomain-map-mask" and "irqdomain-map-pass-thru" may +be provided to help interpret the valid bits of the incoming and mapped +interrupt specifiers respectively. + + Example: + intc: interrupt-controller@17a00000 { + #interrupt-cells = <3>; + }; + + pinctrl@3400000 { + #interrupt-cells = <2>; + irqdomain-map = <22 0 &intc 36 0>, <24 0 &intc 37 0>; + irqdomain-map-mask = <0xff 0>; + irqdomain-map-pass-thru = <0 0xff>; + }; + +In the above example, the input interrupt specifier map-mask <0xff 0> applied +on the incoming interrupt specifier of the map <22 0>, <24 0>, returns the +input interrupt 22, 24 etc. The second argument being irq type is immaterial +from the map and is used from the incoming request instead. The pass-thru +specifier parses the output interrupt specifier from the rest of the unparsed +argments from the map <&intc 36 0>, <&intc 37 0> etc to return the output +interrupt 36, 37 etc.