From patchwork Tue Nov 30 02:22:46 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sam Protsenko X-Patchwork-Id: 517531 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 87125C4332F for ; Tue, 30 Nov 2021 02:22:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237440AbhK3C0O (ORCPT ); Mon, 29 Nov 2021 21:26:14 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58536 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237437AbhK3C0O (ORCPT ); Mon, 29 Nov 2021 21:26:14 -0500 Received: from mail-lf1-x131.google.com (mail-lf1-x131.google.com [IPv6:2a00:1450:4864:20::131]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8D54DC061746 for ; Mon, 29 Nov 2021 18:22:55 -0800 (PST) Received: by mail-lf1-x131.google.com with SMTP id b1so49560707lfs.13 for ; Mon, 29 Nov 2021 18:22:55 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=DYEHlzA1VrNpvRuMbbyAOHVDsMuIQ1cl/rzwkQW1XHM=; b=kWG6d/YEKVy0ZQFanmjZ84CzkosC743/dc3lqH+nDBsAB2hvwNMAl1KIVXsC2S9doX CMSpxUww9c3jEKe/+M89QZtMM3CpKCPh6FgGxxU/3vb/OwRkJGZW4D38SyWvE79oxshU 9wx7ByZBeROaOJ40WikmiQAQMtfdxRHJWdkWdT4A/Hex847HpF4Uth3Elvg0kfmjQuWR ZpIm0D8QdmBUh5E3F6HeSkCKBtApx7+1sttdpDs9WdRNl0I4PUSQA8DicXvCusCH/ifn p0sRRziXWNwOD4UeuEvXI8/BWUbNClq8OTrDQY+4jsX6iTiphXyBgJYVBm/fKmdeHKdZ MLxA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=DYEHlzA1VrNpvRuMbbyAOHVDsMuIQ1cl/rzwkQW1XHM=; b=YmzqXMnxKrG+bgkFrWTIR/6UOn+x8d6+1i3Wp09q1eOrsavX5Tdor3cExKFtyRUivA naiw+vY3F3OFRhrrg5d8OwbZvYDsNN2yDsyobrWmggPciPOVYjvjtgiZMlLgrkmPXQX7 Bt+V9403SEHZceNCEIKNCvVfvbM5Hepjw1PjE4ChBzcGHPANTECN4diRPm1X5ccv8K/w Y64qQ+XE96VNdeVtISRxNmUMxJUjj2sMT2xqRnHDY/4RMz8oVW6PEP8Rq1M5AjvJ7PLK qonnDDTUPULf3RoceEgXLiteU8Rvb/sCFrdhjrdlsHyUbXqpYio3QA52SGuB3dEq4cH5 oQYQ== X-Gm-Message-State: AOAM531XHPXfrdNr3tUuTRQCQK555BQy/FtjrJlr2A3tEjZd1mJMqiS6 9trN23DNK2HIODl9IBruGiUH1A== X-Google-Smtp-Source: ABdhPJxIG40IAHPH8i0k1Mo2rcIfRKc6SZHwzHioud3i38kW70c3c07LFHXozgPujcCFNYVtSsyubw== X-Received: by 2002:ac2:43a6:: with SMTP id t6mr49677286lfl.95.1638238973710; Mon, 29 Nov 2021 18:22:53 -0800 (PST) Received: from localhost ([31.134.121.151]) by smtp.gmail.com with ESMTPSA id l12sm1544858lfe.81.2021.11.29.18.22.52 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 29 Nov 2021 18:22:53 -0800 (PST) From: Sam Protsenko To: Krzysztof Kozlowski , Rob Herring , Greg Kroah-Hartman Cc: Jiri Slaby , Jaewon Kim , Chanho Park , David Virag , Youngmin Nam , devicetree@vger.kernel.org, linux-serial@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-samsung-soc@vger.kernel.org Subject: [PATCH v2 1/5] dt-bindings: soc: samsung: Add Exynos USI bindings Date: Tue, 30 Nov 2021 04:22:46 +0200 Message-Id: <20211130022250.28519-2-semen.protsenko@linaro.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20211130022250.28519-1-semen.protsenko@linaro.org> References: <20211130022250.28519-1-semen.protsenko@linaro.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-serial@vger.kernel.org Add constants for choosing USIv2 configuration mode in device tree. Those are further used in USI driver to figure out which value to write into SW_CONF register. Also document USIv2 IP-core bindings. Signed-off-by: Sam Protsenko --- Changes in v2: - Combined dt-bindings doc and dt-bindings header patches - Added i2c node to example in bindings doc - Added mentioning of shared internal circuits - Added USI_V2_NONE value to bindings header .../bindings/soc/samsung/exynos-usi.yaml | 135 ++++++++++++++++++ include/dt-bindings/soc/samsung,exynos-usi.h | 17 +++ 2 files changed, 152 insertions(+) create mode 100644 Documentation/devicetree/bindings/soc/samsung/exynos-usi.yaml create mode 100644 include/dt-bindings/soc/samsung,exynos-usi.h diff --git a/Documentation/devicetree/bindings/soc/samsung/exynos-usi.yaml b/Documentation/devicetree/bindings/soc/samsung/exynos-usi.yaml new file mode 100644 index 000000000000..a822bc62b3cd --- /dev/null +++ b/Documentation/devicetree/bindings/soc/samsung/exynos-usi.yaml @@ -0,0 +1,135 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/soc/samsung/exynos-usi.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Samsung's Exynos USI (Universal Serial Interface) binding + +maintainers: + - Sam Protsenko + - Krzysztof Kozlowski + +description: | + USI IP-core provides selectable serial protocol (UART, SPI or High-Speed I2C). + USI shares almost all internal circuits within each protocol, so only one + protocol can be chosen at a time. USI is modeled as a node with zero or more + child nodes, each representing a serial sub-node device. The mode setting + selects which particular function will be used. + + Refer to next bindings documentation for information on protocol subnodes that + can exist under USI node: + + [1] Documentation/devicetree/bindings/serial/samsung_uart.yaml + [2] Documentation/devicetree/bindings/i2c/i2c-exynos5.txt + [3] Documentation/devicetree/bindings/spi/spi-samsung.txt + +properties: + $nodename: + pattern: "^usi@[0-9a-f]+$" + + compatible: + const: samsung,exynos-usi-v2 + + reg: + maxItems: 1 + + clocks: + items: + - description: Bus (APB) clock + - description: Operating clock for UART/SPI/I2C protocol + + clock-names: + items: + - const: pclk + - const: ipclk + + ranges: true + + "#address-cells": + const: 1 + + "#size-cells": + const: 1 + + samsung,sysreg: + $ref: /schemas/types.yaml#/definitions/phandle-array + description: + Should be phandle/offset pair. The phandle to System Register syscon node + (for the same domain where this USI controller resides) and the offset + of SW_CONF register for this USI controller. + + samsung,mode: + $ref: /schemas/types.yaml#/definitions/uint32 + description: + Selects USI function (which serial protocol to use). Refer to + for valid USI mode values. + + samsung,clkreq-on: + type: boolean + description: + Enable this property if underlying protocol requires the clock to be + continuously provided without automatic gating. As suggested by SoC + manual, it should be set in case of SPI/I2C slave, UART Rx and I2C + multi-master mode. Usually this property is needed if USI mode is set + to "UART". + + This property is optional. + +patternProperties: + # All other properties should be child nodes + "^.*@[0-9a-f]+$": + type: object + description: Child node describing underlying USI serial protocol + +required: + - compatible + - reg + - clocks + - clock-names + - ranges + - "#address-cells" + - "#size-cells" + - samsung,sysreg + - samsung,mode + +additionalProperties: false + +examples: + - | + #include + #include + + usi0: usi@138200c0 { + compatible = "samsung,exynos-usi-v2"; + reg = <0x138200c0 0x20>; + samsung,sysreg = <&sysreg_peri 0x1010>; + samsung,mode = ; + samsung,clkreq-on; /* needed for UART mode */ + #address-cells = <1>; + #size-cells = <1>; + ranges; + clocks = <&cmu_peri 32>, <&cmu_peri 31>; + clock-names = "pclk", "ipclk"; + status = "disabled"; + + serial_0: serial@13820000 { + compatible = "samsung,exynos850-uart"; + reg = <0x13820000 0xc0>; + interrupts = ; + clocks = <&cmu_peri 32>, <&cmu_peri 31>; + clock-names = "uart", "clk_uart_baud0"; + status = "disabled"; + }; + + hsi2c_0: i2c@13820000 { + compatible = "samsung,exynosautov9-hsi2c"; + reg = <0x13820000 0xc0>; + interrupts = ; + #address-cells = <1>; + #size-cells = <0>; + clocks = <&cmu_peri 32>, <&cmu_peri 31>; + clock-names = "hsi2c_pclk", "hsi2c"; + status = "disabled"; + }; + }; diff --git a/include/dt-bindings/soc/samsung,exynos-usi.h b/include/dt-bindings/soc/samsung,exynos-usi.h new file mode 100644 index 000000000000..a01af169d249 --- /dev/null +++ b/include/dt-bindings/soc/samsung,exynos-usi.h @@ -0,0 +1,17 @@ +/* SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) */ +/* + * Copyright (c) 2021 Linaro Ltd. + * Author: Sam Protsenko + * + * Device Tree bindings for Samsung Exynos USI (Universal Serial Interface). + */ + +#ifndef __DT_BINDINGS_SAMSUNG_EXYNOS_USI_H +#define __DT_BINDINGS_SAMSUNG_EXYNOS_USI_H + +#define USI_V2_NONE 0 +#define USI_V2_UART 1 +#define USI_V2_SPI 2 +#define USI_V2_I2C 3 + +#endif /* __DT_BINDINGS_SAMSUNG_EXYNOS_USI_H */