From patchwork Sat Jun 20 22:42:16 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?J=2E_Neusch=C3=A4fer?= X-Patchwork-Id: 1313763 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=23.128.96.18; helo=vger.kernel.org; envelope-from=linux-pwm-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=gmx.net Authentication-Results: ozlabs.org; dkim=pass (1024-bit key; secure) header.d=gmx.net header.i=@gmx.net header.a=rsa-sha256 header.s=badeba3b8450 header.b=J+FgROFF; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by ozlabs.org (Postfix) with ESMTP id 49q9h259BXz9sQt for ; Sun, 21 Jun 2020 08:43:46 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729063AbgFTWnj (ORCPT ); Sat, 20 Jun 2020 18:43:39 -0400 Received: from mout.gmx.net ([212.227.15.19]:36951 "EHLO mout.gmx.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728892AbgFTWnf (ORCPT ); Sat, 20 Jun 2020 18:43:35 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=gmx.net; s=badeba3b8450; t=1592692955; bh=ndIbgrYQmb2subu3Oe9fLJNTph0wDs4Jgr3O6ddsGCs=; h=X-UI-Sender-Class:From:To:Cc:Subject:Date:In-Reply-To:References; b=J+FgROFFQ3bRtxN3HX8GAAM80SYvrFVum3jbjkMuDoZv82bbzd7p4v2lwUObmvi9U RKKkU7ABlhhOf3ucQr/YoDYi2VelWwIOv4bta+W+0QX2BbXRhXfTtTs9zySXTLu11L 7T1AUf5LhLDeDqYz6VADvdNbwPyJo8wPvWSJhok8= X-UI-Sender-Class: 01bb95c1-4bf8-414a-932a-4f6e2808ef9c Received: from longitude ([5.146.194.186]) by mail.gmx.com (mrgmx005 [212.227.17.190]) with ESMTPSA (Nemesis) id 1Mzhj9-1j0ZJq0foH-00vh75; Sun, 21 Jun 2020 00:42:35 +0200 From: =?utf-8?q?Jonathan_Neusch=C3=A4fer?= To: linux-kernel@vger.kernel.org Cc: Lee Jones , Rob Herring , =?utf-8?q?Jonathan_Neusch=C3=A4fer?= , Thierry Reding , =?utf-8?q?Uwe_Kleine-K=C3=B6nig?= , Alessandro Zummo , Alexandre Belloni , Shawn Guo , Sascha Hauer , Pengutronix Kernel Team , Fabio Estevam , NXP Linux Team , Sam Ravnborg , Linus Walleij , Heiko Stuebner , Stephan Gerhold , Lubomir Rintel , Mark Brown , allen , Mauro Carvalho Chehab , "David S. Miller" , devicetree@vger.kernel.org, linux-pwm@vger.kernel.org, linux-rtc@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Heiko Stuebner , Josua Mayer , Andreas Kemnade Subject: [RFC PATCH 05/10] dt-bindings: pwm: Add bindings for PWM function in Netronix EC Date: Sun, 21 Jun 2020 00:42:16 +0200 Message-Id: <20200620224222.1312520-4-j.neuschaefer@gmx.net> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20200620224222.1312520-1-j.neuschaefer@gmx.net> References: <20200620224222.1312520-1-j.neuschaefer@gmx.net> MIME-Version: 1.0 X-Provags-ID: V03:K1:cHtrETJXmtzDsxaAmeos/P2xE+50CNmj6sgaAzFuUOlSUWq/6Ys cqIg7vWmvwXLCa21o6GeBXwf7oIpciGmMqEZBvyiohhFZM1XVsvYPlRTVOpG6EouIIfpHjN oRsfkw7/ClzqOiL+Ze+SJxfetrwj8+i5loPqfXmdK6ge0n7fr6C0p4UdWe8JtrynlkTEetf o6hOJXw2ktAxvqog9HAtw== X-Spam-Flag: NO X-UI-Out-Filterresults: notjunk:1;V03:K0:U9UJEZBhzvM=:b/45FR0hRI3CJbRxSnghbs 4CVZ30R7wRT0hf/CVO3qu1lLPiL64OTe48LZB7taUb79jr8YtYz3PoP4kXOOJ7ly9HJYTV5Zc LgKtHTFsqYIQ3Go2aeby/iy3BgsvbCEcLEaMAGpNs2w0ICbZCNkB5Nfs/r6NcyWCrr2T8eTXs pk+5MnFTiweecLuDjO8tMwlItb4ERwxiReHLzWhIW+SGwLQO1br+3BDyWYilMsZmFECvPIXy7 R8PTNl0Pp0XAS+VJJ8FETabtlYYJPyYzrm/sf4FxwfkNH8WmG7GQrKqSU/hE2kruPsomsJgbz VylHazUogB7jLAuVfvJRvOoTeBk/IhRxX8Wdu88H3NjVCM4NI3nEE5H4tmhnWtZsrMHj3P46J X2VwLnEIjtMvaRZauEtnc3Lk6f1e2EwKKjSmZra5J9wM8Zws9gFoU9Np5I9fsMyMS4DtVscHm iQST7d2sMiChWnmRRxzJqlXCtZLeJFK+ntFKVpupt/UAv0bJshq1daszb0BzPm0F6u0Qg3wtH Opt9xdEDU0G21u/025dZrOwyjdHl5VdwsscVUCkGlw5cOi1RsiOTY7gLP6CVlfOO+Fnr3ZUD6 pB2BOCPTjKq6F13nAMl9erVGVBGcbjlp2VgFiajIgVQPWHVeGFI2CO0wU5hZ5UynxOcg8ekI4 dHL8mcmn2v2Pr55i+kuNomAuiaPbfgMhqnGyafvkmxq0MPH2wvdUSs1SDAtaVdV6OY3rEEjnq iarr91l9VRFmF0XsEMKFC92gjt2XeM4Hzej52q0W38s6jVc9AaWx1aMYusxnObCZPeTAwFQbE 5g3U/ZxPlApbj67/DauJBq7BdZ8/NLQmOGCLMQVp2MAXAFFgtzYasDZZZWjOX/Th2kUcaDN+I /4je8CQoaIG0UGtbZsAkFLy/1LMvLLPS3RZnSBbBgeyqEUOKmMbV1QwweQvoxrDoyxrHMi7Gy f0CXDruLnA9KezIt5srHTBpDD/s8cnyqpoIMkRwLzNo6vntAGe4flze443K5S0lvoeTaE/Lhg FK6WurPDfcgGo7nc0XLaWxFV23mCGRplOl0wIVexTiT7P5ZX+0/H2CBUg1iNb/gUgsUz/OvYr NHO8JLR/iMAhn7YqXEib1JicjAFSXpl7DZCkiwZlBCf0qq3sZ9SQZ65/6ZdcYN44uMkx2/tSr JUicJiTDBAVIjZFgVdM/hOgF2/wViONZSXF3ZCMfWDTBXZHst1/sSne2cl0mqYQKVr5KeVl9W 4L+uoGkI98FY33KXZ Sender: linux-pwm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pwm@vger.kernel.org The Netronix embedded controller as found in Kobo Aura and Tolino Shine supports one PWM channel, which is used to control the frontlight brightness on these devices. Known problems: - `make dt_binding_check` shows the following warnings: Documentation/devicetree/bindings/mfd/netronix,ntxec.example.dts:49.17-42: Warning (pwms_property): /example-0/backlight:pwms: cell 2 is not a phandle reference Documentation/devicetree/bindings/mfd/netronix,ntxec.example.dts:49.17-42: Warning (pwms_property): /example-0/backlight:pwms: Could not get phandle node for (cell 2) Signed-off-by: Jonathan Neuschäfer --- .../bindings/mfd/netronix,ntxec.yaml | 13 ++++++++ .../bindings/pwm/netronix,ntxec-pwm.yaml | 33 +++++++++++++++++++ 2 files changed, 46 insertions(+) create mode 100644 Documentation/devicetree/bindings/pwm/netronix,ntxec-pwm.yaml -- 2.27.0 diff --git a/Documentation/devicetree/bindings/mfd/netronix,ntxec.yaml b/Documentation/devicetree/bindings/mfd/netronix,ntxec.yaml index 596df460f98eb..6562c41c5a9a9 100644 --- a/Documentation/devicetree/bindings/mfd/netronix,ntxec.yaml +++ b/Documentation/devicetree/bindings/mfd/netronix,ntxec.yaml @@ -31,6 +31,9 @@ properties: description: The EC can signal interrupts via a GPIO line + pwm: + $ref: ../pwm/netronix,ntxec-pwm.yaml + required: - compatible - reg @@ -53,5 +56,15 @@ examples: interrupts = <11 IRQ_TYPE_EDGE_FALLING>; interrupt-controller; #interrupt-cells = <1>; + + ec_pwm: pwm { + compatible = "netronix,ntxec-pwm"; + #pwm-cells = <1>; + }; }; }; + + backlight { + compatible = "pwm-backlight"; + pwms = <&ec_pwm 0 50000>; + }; diff --git a/Documentation/devicetree/bindings/pwm/netronix,ntxec-pwm.yaml b/Documentation/devicetree/bindings/pwm/netronix,ntxec-pwm.yaml new file mode 100644 index 0000000000000..1dc1b1aba081c --- /dev/null +++ b/Documentation/devicetree/bindings/pwm/netronix,ntxec-pwm.yaml @@ -0,0 +1,33 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/pwm/netronix,ntxec-pwm.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: PWM functionality in Netronix embedded controller + +maintainers: + - Jonathan Neuschäfer + +description: | + See also Documentation/devicetree/bindings/mfd/netronix,ntxec.yaml + + The Netronix EC contains PWM functionality, which is usually used to drive + the backlight LED. + + The following PWM channels are supported: + - 0: The PWM channel controlled by registers 0xa1-0xa7 + +allOf: + - $ref: pwm.yaml# + +properties: + compatible: + const: netronix,ntxec-pwm + + "#pwm-cells": + const: 1 + +required: + - compatible + - "#pwm-cells"