From patchwork Mon Feb 14 13:58:35 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Conor Dooley X-Patchwork-Id: 12745642 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 3ACCAC433EF for ; Mon, 14 Feb 2022 13:56:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:CC:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=G0Pn55BXycI8HHxdktHe7+IBgm5BhJHEenr5566ZEWQ=; b=xHk2bwmRyYKqvl dXRBXOahKZIn0pV2/8xFoa6NlpUC9iZvPTzLtoRzRvJBZJDFKVRztmgelwFCZTufW2uN3ZS6IzEjF YG/stak3tCf/KnPiSFfJnIR7tA8kIuxDv/3e18fMy70tZJltWH/GazcAzjXqP8IkcfgjCs/NRypeu +YG/tXGSA+NAaiRIGNDXH6ktXCIRYUPJQil/SKr3egYwIa0V7kN7MXdQ/6Id9Reg2PMCOFP/gcCbG Ed/m7BwilmWe5NIUSnBL4ot158+c9l4+//Fz/DEEjLX+gj5afE056KjDYcmfUQecUo3+WVpzM7EKm 68jRJunl9Z+ls4ESSmHw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1nJbqJ-00FVUt-Cj; Mon, 14 Feb 2022 13:56:39 +0000 Received: from esa.microchip.iphmx.com ([68.232.153.233]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1nJbqE-00FVRG-H7 for linux-riscv@lists.infradead.org; Mon, 14 Feb 2022 13:56:38 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=microchip.com; i=@microchip.com; q=dns/txt; s=mchp; t=1644846994; x=1676382994; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=UmflVMW1wi6gLsKsd8h3yAY2Rc3GU+Tr+EkBhqS8x6M=; b=ubO3DwnAdNbi3NPn9Gn1Dr+BAPz8gUGbl3dprhMlhxbpcyco4hQIwH6H 98K6bhm8k1u1tPrK9ORcpg8VrttVjJi06LGhAIWnDkRD9VOf2bPlLkx00 DvbgBVW9lYK5r7+nxFwepUeGv5ToEl1Vz1CnyngSqnsmtvLvb3p6G0yIV DKDy869sdaOXfRuqfNA2YUu1fTwWzj4N7MXKcU5kecT28lCizK0RT0raF 6nkFzzNItYsDUAUlkqlitcaFiuTz80pjUk6iIfp2O1S1m1P0jM0/V2pRe 6Zy6iElwdno6HpFD6qVNWEztf2AEjeoB1iYpl2dC1Ky6mtwaeosXQO6h/ g==; IronPort-SDR: wsWP+cXMNk//TH2wOX2suvAZexUeW0dvVf3GsXtzSo2q+XGN071f7gJDbYI0T2ehIbJbp31TOA PZpcqElnrUxoDUVxxBBaaphZGPlUzHI+/iYfuiuvZib4MaDIhogK+J5AWSEKjH6QBVB/W9fAYz bD7xa+hfXun6hk2IcgJf71us3Oktdt3zSrP8PrrS4FjU863DoZ59WEpfr0qtN/5EF/Rv1nL9Rr OSpsIcEog28Ln/CzAMwYjUfBBMkh8H7nNeAUxOxnwoGePVdP7eVBL5R/NA70wYOfyY682p7iVl tJq0JI60hBko+BcFgLPpaFn0 X-IronPort-AV: E=Sophos;i="5.88,368,1635231600"; d="scan'208";a="162154139" Received: from smtpout.microchip.com (HELO email.microchip.com) ([198.175.253.82]) by esa1.microchip.iphmx.com with ESMTP/TLS/AES256-SHA256; 14 Feb 2022 06:56:33 -0700 Received: from chn-vm-ex04.mchp-main.com (10.10.85.152) by chn-vm-ex04.mchp-main.com (10.10.85.152) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.17; Mon, 14 Feb 2022 06:56:32 -0700 Received: from wendy.microchip.com (10.10.115.15) by chn-vm-ex04.mchp-main.com (10.10.85.152) with Microsoft SMTP Server id 15.1.2375.17 via Frontend Transport; Mon, 14 Feb 2022 06:56:27 -0700 From: To: , , , , , , , , , , , , , , , , , , , CC: , , , , , Rob Herring , Palmer Dabbelt Subject: [PATCH v7 05/11] dt-bindings: pwm: add microchip corepwm binding Date: Mon, 14 Feb 2022 13:58:35 +0000 Message-ID: <20220214135840.168236-6-conor.dooley@microchip.com> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220214135840.168236-1-conor.dooley@microchip.com> References: <20220214135840.168236-1-conor.dooley@microchip.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220214_055634_615784_36D6CD27 X-CRM114-Status: GOOD ( 16.17 ) X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org From: Conor Dooley Add device tree bindings for the Microchip fpga fabric based "core" PWM controller. Reviewed-by: Rob Herring Signed-off-by: Conor Dooley Acked-by: Palmer Dabbelt Acked-by: Uwe Kleine-König Acked-by: Thierry Reding --- .../bindings/pwm/microchip,corepwm.yaml | 81 +++++++++++++++++++ 1 file changed, 81 insertions(+) create mode 100644 Documentation/devicetree/bindings/pwm/microchip,corepwm.yaml diff --git a/Documentation/devicetree/bindings/pwm/microchip,corepwm.yaml b/Documentation/devicetree/bindings/pwm/microchip,corepwm.yaml new file mode 100644 index 000000000000..a7fae1772a81 --- /dev/null +++ b/Documentation/devicetree/bindings/pwm/microchip,corepwm.yaml @@ -0,0 +1,81 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) + +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/pwm/microchip,corepwm.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Microchip IP corePWM controller bindings + +maintainers: + - Conor Dooley + +description: | + corePWM is an 16 channel pulse width modulator FPGA IP + + https://www.microsemi.com/existing-parts/parts/152118 + +allOf: + - $ref: pwm.yaml# + +properties: + compatible: + items: + - const: microchip,corepwm-rtl-v4 + + reg: + maxItems: 1 + + clocks: + maxItems: 1 + + "#pwm-cells": + const: 2 + + microchip,sync-update-mask: + description: | + Depending on how the IP is instantiated, there are two modes of operation. + In synchronous mode, all channels are updated at the beginning of the PWM period, + and in asynchronous mode updates happen as the control registers are written. + A 16 bit wide "SHADOW_REG_EN" parameter of the IP core controls whether synchronous + mode is possible for each channel, and is set by the bitstream programmed to the + FPGA. If the IP core is instantiated with SHADOW_REG_ENx=1, both registers that + control the duty cycle for channel x have a second "shadow"/buffer reg synthesised. + At runtime a bit wide register exposed to APB can be used to toggle on/off + synchronised mode for all channels it has been synthesised for. + Each bit of "microchip,sync-update-mask" corresponds to a PWM channel & represents + whether synchronous mode is possible for the PWM channel. + + $ref: /schemas/types.yaml#/definitions/uint32 + default: 0 + + microchip,dac-mode-mask: + description: | + Optional, per-channel Low Ripple DAC mode is possible on this IP core. It creates + a minimum period pulse train whose High/Low average is that of the chosen duty + cycle. This "DAC" will have far better bandwidth and ripple performance than the + standard PWM algorithm can achieve. A 16 bit DAC_MODE module parameter of the IP + core, set at instantiation and by the bitstream programmed to the FPGA, determines + whether a given channel operates in regular PWM or DAC mode. + Each bit corresponds to a PWM channel & represents whether DAC mode is enabled + for that channel. + + $ref: /schemas/types.yaml#/definitions/uint32 + default: 0 + +required: + - compatible + - reg + - clocks + +additionalProperties: false + +examples: + - | + pwm@41000000 { + compatible = "microchip,corepwm-rtl-v4"; + microchip,sync-update-mask = /bits/ 32 <0>; + clocks = <&clkcfg 30>; + reg = <0x41000000 0xF0>; + #pwm-cells = <2>; + };