From patchwork Sat Sep 5 13:32:24 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: 1358030 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-rtc-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=VTrOrwLd; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by ozlabs.org (Postfix) with ESMTP id 4BkGBM1RX5z9sPB for ; Sat, 5 Sep 2020 23:49:47 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728623AbgIENh1 (ORCPT ); Sat, 5 Sep 2020 09:37:27 -0400 Received: from mout.gmx.net ([212.227.15.18]:60687 "EHLO mout.gmx.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728248AbgIENg0 (ORCPT ); Sat, 5 Sep 2020 09:36:26 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=gmx.net; s=badeba3b8450; t=1599312868; bh=u6aT3F2Q3gGj9nh0VqE3OXnqr1dQ+ZyFPqUs/hm8TgM=; h=X-UI-Sender-Class:From:To:Cc:Subject:Date:In-Reply-To:References; b=VTrOrwLdl4pu3ogu+tX1ulxWEe25edkYiUMGaIhQ/mTYlTRBQOoFvpqExbfUQUSry JOrlpStlTpnVAsnfTjlxaxKe2R/Gunh+GF03rfAbLw6g+nu60sbvsYBZFZsOK+GajF ItQfPSPZGJ6UY6SwcxSmNpqIB/LPZwDjYOYwZzsw= X-UI-Sender-Class: 01bb95c1-4bf8-414a-932a-4f6e2808ef9c Received: from longitude ([5.146.195.151]) by mail.gmx.com (mrgmx004 [212.227.17.190]) with ESMTPSA (Nemesis) id 1N1fis-1kh7lb4104-0121s1; Sat, 05 Sep 2020 15:34:28 +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 , Arnd Bergmann , Daniel Palmer Subject: [PATCH v2 04/10] dt-bindings: pwm: Add bindings for PWM function in Netronix EC Date: Sat, 5 Sep 2020 15:32:24 +0200 Message-Id: <20200905133230.1014581-5-j.neuschaefer@gmx.net> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200905133230.1014581-1-j.neuschaefer@gmx.net> References: <20200905133230.1014581-1-j.neuschaefer@gmx.net> MIME-Version: 1.0 X-Provags-ID: V03:K1:BsE/idGOdG/2VXSLRx4X2BZv664ZNJ0vKz0CEYNYAzQ7v4uWeOA AH0UJ2IvlSFVX/IPDzYUdnVcGC28q2xjtegYX7p1jz6XfdEKfPefQNjGkbZtUVs0iWyDsdq pi1cQ/C4oPqlEjjGnAJWf4fX/TKoh1ScMzVbK0LXQgdYA4NsLCioS6RizAlvLK1+CLNqmE7 y1U84rzjlrWmDVonmfVwQ== X-Spam-Flag: NO X-UI-Out-Filterresults: notjunk:1;V03:K0:l9Pn3RK6sU4=:32jTXN2fuXC35YyG4qm9yc rqzKI+D7X8fDm05U4U7UdsotjDgUMgt6dXGzqe6hTgvIDavtF1XZ39TZc9FIAtwNSivTUAZ87 281tV/cSuc5eQtMxk22j11gA8XDt4Sz9M7v89ej54wYhswdpfMB5F4enFZSLzC+nSeUIOq5kz K12u+VqN7ImWu/xmahRs4V/Wl2NwQIJ44mxCD5CEfKHW/17b+9z2IrDFX5NlEr4b8sYROI3eU fxqV3tQc5pDk8pHYIC/IvaHtA28gC4CwPPgW/TfvFBvMm5T6/nVRrZ+sslUbW5dhIRY2hNREj 68444En7rlvmeg0JYRA6NNZ4y1fysrOa7GLnp3DbjwFm9rFiRWEhpjayYguXa9abljff42YEx cU92jNa7+ccR91m8Ig7QBIRBuLT438N6++695t/lBMNLob/XpYhPZ3Q01yQ+A2BnX47iMpBxp TbzowqVtlz5GeBAEZCobwlOLI13McPrvCiOprOpbBmYpkpc2OEkyS/GDm32vQ0q4b/VXDqX8e X2JdSvamxIB3A9CHs+sSkzKLRCn61r0+jQHcvsUgz3xq0t8yh8xMiKerGIresipwdmokXOq9p yPmXghPsgckUPApCt1KGI7F+uMNoH1jWAoWkedKKofq7VKaM7zZwpxnSD2/4w+C6kQmAS+PPG MXFSDiFzpHjz1M3VTDdS5Bkv/YKK28r9c6v7UAvhYH03Kb7tIxjDt2bHhsfD0eoeqCh2IFuVP bRRF7hPCqGRjrp6ydImrY+xczgbyTbZZmlCmT4VEW2kr/H4iQhJuviIjpg+HMIyJTSaQxNIOd cMdN3flWBpfZe/mc1C6uRmYe/rcYe8ndELUT0LrzitHbqpEeQkOTiNB3cj5AQJRrLFCBxmGWu ico6cruOgvc45p2TaVJtL5pV1ry+cMaKB/bHEtjAOWKEuiHSo58E7AZIdMZG8jhI9Y8lvm06K ylRtcrbePCjaE+eqAmXEf+pTqpCr5eDNPZU3/4oTs9cKspXsC7muJfU5i+bDBwLmRhElPqjhv 5aIMBEjR/7BHC20WhFr8gAGB802rwo+y6dLxiuWQDPwsvtahqvKybyO7az5kI7tlebOvcyesy qv/KyjhP0oWNKqQCRro/10VOjjWzUl4frT86KXg+DNrQkq7P9005Het/s7AxMqFJrq38AAL8a v0NZHR2T28KJ9c+8pSHqsvvPi98mSqvABWRFJBvtFe/BqN6ilvXx1lV4UdBmRIH9ecgppIhMJ Kg2t0RUPELK4a94nagaOer/50rwkWsi54i2g7ig== Sender: linux-rtc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-rtc@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. Signed-off-by: Jonathan Neuschäfer --- v2: - Add plaintext binding to patch description, for comparison - Fix pwm-cells property (should be 2, not 1) - Add dummy regulator to example, because the pwm-backlight binding requires a power supply For reference, here is the binding in text form: PWM functionality in Netronix Embedded Controller Required properties: - compatible: should be "netronix,ntxec-pwm" - #pwm-cells: should be 2. Available PWM channels: - 0: The PWM channel controlled by registers 0xa1-0xa7 Example: embedded-controller@43 { compatible = "netronix,ntxec"; ... ec_pwm: pwm { compatible = "netronix,ntxec-pwm"; #pwm-cells = <1>; }; }; ... backlight { compatible = "pwm-backlight"; pwms = <&ec_pwm 0 50000>; }; --- .../bindings/mfd/netronix,ntxec.yaml | 19 +++++++++++ .../bindings/pwm/netronix,ntxec-pwm.yaml | 33 +++++++++++++++++++ 2 files changed, 52 insertions(+) create mode 100644 Documentation/devicetree/bindings/pwm/netronix,ntxec-pwm.yaml -- 2.28.0 diff --git a/Documentation/devicetree/bindings/mfd/netronix,ntxec.yaml b/Documentation/devicetree/bindings/mfd/netronix,ntxec.yaml index 596df460f98eb..73c873dda3e70 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: + $ref: ../pwm/netronix,ntxec-pwm.yaml + required: - compatible - reg @@ -53,5 +56,21 @@ examples: interrupts = <11 IRQ_TYPE_EDGE_FALLING>; interrupt-controller; #interrupt-cells = <1>; + + ec_pwm: pwm { + compatible = "netronix,ntxec-pwm"; + #pwm-cells = <2>; + }; }; }; + + backlight { + compatible = "pwm-backlight"; + pwms = <&ec_pwm 0 50000>; + power-supply = <&backlight_regulator>; + }; + + backlight_regulator: regulator-dummy { + compatible = "regulator-fixed"; + regulator-name = "backlight"; + }; diff --git a/Documentation/devicetree/bindings/pwm/netronix,ntxec-pwm.yaml b/Documentation/devicetree/bindings/pwm/netronix,ntxec-pwm.yaml new file mode 100644 index 0000000000000..0c9d2801b8de1 --- /dev/null +++ b/Documentation/devicetree/bindings/pwm/netronix,ntxec-pwm.yaml @@ -0,0 +1,33 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$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: 2 + +required: + - compatible + - "#pwm-cells"