From patchwork Tue Dec 1 10:13:49 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Linus Walleij X-Patchwork-Id: 336296 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-18.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id B6EB3C64E7A for ; Tue, 1 Dec 2020 10:14:37 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5F09A207FF for ; Tue, 1 Dec 2020 10:14:37 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="IQkH9IZF" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729740AbgLAKOh (ORCPT ); Tue, 1 Dec 2020 05:14:37 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33986 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729737AbgLAKOg (ORCPT ); Tue, 1 Dec 2020 05:14:36 -0500 Received: from mail-lf1-x143.google.com (mail-lf1-x143.google.com [IPv6:2a00:1450:4864:20::143]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 38242C0613D4 for ; Tue, 1 Dec 2020 02:13:56 -0800 (PST) Received: by mail-lf1-x143.google.com with SMTP id r24so3017180lfm.8 for ; Tue, 01 Dec 2020 02:13:56 -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:mime-version :content-transfer-encoding; bh=EpTyVObyidZ7afZe2Xs7DnnCx9ZUD9L2PJpxRCgQy1Q=; b=IQkH9IZFy0od+oQknsmtn3hLQBjVycftewD4WssFOmVU9SMKCDyZE0mnXDDgTjnPB0 th10nWKszbWiGbUp0dg9ew1raNVi0pTzeu8mMj09PX0VAPeKPYRPS3H6uEcCEa7GqoHE s+vi6PLpngkTC8Lvh8o/AGse9LjOLGLz/Zu209gC42MeFDs9FEtEiX+mPM3Kk1iBSfMC v2ygK5TSPigrQplLCeqTa7N2i+YG5oTAZXsjGUXmxIk0oa/1bzYGJ/AaNSR4/Sm16pS+ O/Jg1RXnzJP3Ek1BDMzxhhd9AfF3tYwK5XOiNIl9EoVj/Km0zU1m/PvKUsFrdghBi1eQ 0LZQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=EpTyVObyidZ7afZe2Xs7DnnCx9ZUD9L2PJpxRCgQy1Q=; b=a8Sn/We7ySFX+FV69BbPrkmtQ8Q6cAq9GezzD+FwvuxLTiWeNFTk7I/NoXDe/hnZ+p VwrJpehpaI4CWtY0nwSmhzNTuLlVFNL/N+SfvVaS/XwZpSFoRFJqGKHgqFbVkYKvBBH8 D0NT6sOrQt8jI0aIVgrK4vGyn8fZ8rohOA9cxk4HfI/MjhntXEnTO+FPhfkNCBbmD642 JrikeEGsd2fwfTXw0l2Ds3UCa8QG2/DW2v4Y8XWDqs/FeM3O7M1RoDO32lo/an6C2UHg Vh8Wj+gx6ZyNiOLbmS7o3M86YCrqhXb9QW7jSAYMHkv5gQ7m7JZ0X49CuuQb6ODOIqtr WMNA== X-Gm-Message-State: AOAM532XC1yasOv1/hCHLhr50HEijP2Eno9tHAuCVDdZDczU31LcfRli rwydX6cIHirbW7kQvwyLsRg5yA== X-Google-Smtp-Source: ABdhPJxjWhIfTnswlk7jEvjzsccOqgYgmAk/RQdgUEbNmFrA+TVRdzgA1LYCwcT4oTFNwcmy1aTOnA== X-Received: by 2002:a05:6512:3054:: with SMTP id b20mr927260lfb.45.1606817634498; Tue, 01 Dec 2020 02:13:54 -0800 (PST) Received: from localhost.bredbandsbolaget (c-92d7225c.014-348-6c756e10.bbcust.telenor.se. [92.34.215.146]) by smtp.gmail.com with ESMTPSA id z20sm151495ljh.86.2020.12.01.02.13.53 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 01 Dec 2020 02:13:53 -0800 (PST) From: Linus Walleij To: Jacek Anaszewski , Pavel Machek , Dan Murphy Cc: linux-leds@vger.kernel.org, Linus Walleij , Sakari Ailus , newbytee@protonmail.com, Stephan Gerhold , phone-devel@vger.kernel.org, linux-media@vger.kernel.org, devicetree@vger.kernel.org, Sakari Ailus Subject: [PATCH 1/2 v7] dt-bindings: leds: Add DT binding for Richtek RT8515 Date: Tue, 1 Dec 2020 11:13:49 +0100 Message-Id: <20201201101350.1401956-1-linus.walleij@linaro.org> X-Mailer: git-send-email 2.26.2 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-leds@vger.kernel.org Add a YAML devicetree binding for the Richtek RT8515 dual channel flash/torch LED driver. Cc: Sakari Ailus Cc: newbytee@protonmail.com Cc: Stephan Gerhold Cc: phone-devel@vger.kernel.org Cc: linux-media@vger.kernel.org Cc: devicetree@vger.kernel.org Reviewed-by: Sakari Ailus Signed-off-by: Linus Walleij Reviewed-by: Rob Herring --- ChangeLog v6->v7: - Use led-max-microamp for the torch mode max current. - Drop the torch-specific new property from common.yaml in favor of this property. - Collect Sakari's review tag. ChangeLog v5->v6: - Use the suffix -ohms for the resistor values as this gets recognized by default by dtschema and is nominal. ChangeLog v4->v5: - Fix the RFS/RTS resistors to reference the u32 schema. - Fix resisitor speling error. ChangeLog v3->v4: - Add DT attributes for the RFS and RTS resistors, so that the hardware-defined maximum current can be determined. - Add torch-max-microamp to the common bindings so we can set an attribute for the max microamp in torch mode. - Add flash-max-microamp and torch-max-microamp as optional to the LED node. - Slot in some elabortative descriptions of the new properties and describe what the hardware is doing. - Cc phone-devel@vger.kernel.org ChangeLog v2->v3: - Add Sakari to CC - Resend ChangeLog v1->v2: - Explicitly inherit function, color and flash-max-timeout-us from common.yaml - Add "led" node as required. --- .../bindings/leds/richtek,rt8515.yaml | 109 ++++++++++++++++++ 1 file changed, 109 insertions(+) create mode 100644 Documentation/devicetree/bindings/leds/richtek,rt8515.yaml diff --git a/Documentation/devicetree/bindings/leds/richtek,rt8515.yaml b/Documentation/devicetree/bindings/leds/richtek,rt8515.yaml new file mode 100644 index 000000000000..3190e4fcfdf2 --- /dev/null +++ b/Documentation/devicetree/bindings/leds/richtek,rt8515.yaml @@ -0,0 +1,109 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/leds/richtek,rt8515.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Richtek RT8515 1.5A dual channel LED driver + +maintainers: + - Linus Walleij + +description: | + The Richtek RT8515 is a dual channel (two mode) LED driver that + supports driving a white LED in flash or torch mode. The maximum + current for each mode is defined in hardware using two resistors + RFS and RTS. + +properties: + compatible: + const: richtek,rt8515 + + enf-gpios: + maxItems: 1 + description: A connection to the 'ENF' (enable flash) pin. + + ent-gpios: + maxItems: 1 + description: A connection to the 'ENT' (enable torch) pin. + + richtek,rfs-ohms: + minimum: 7680 + maximum: 367000 + description: The resistance value of the RFS resistor. This + resistors limits the maximum flash current. This must be set + for the property flash-max-microamp to work, the RFS resistor + defines the range of the dimmer setting (brightness) of the + flash LED. + + richtek,rts-ohms: + minimum: 7680 + maximum: 367000 + description: The resistance value of the RTS resistor. This + resistors limits the maximum torch current. This must be set + for the property torch-max-microamp to work, the RTS resistor + defines the range of the dimmer setting (brightness) of the + torch LED. + + led: + type: object + $ref: common.yaml# + properties: + function: true + color: true + flash-max-timeout-us: true + + flash-max-microamp: + maximum: 700000 + description: The maximum current for flash mode + is hardwired to the component using the RFS resistor to + ground. The maximum hardware current setting is calculated + according to the formula Imax = 5500 / RFS. The lowest + allowed resistance value is 7.86 kOhm giving an absolute + maximum current of 700mA. By setting this attribute in + the device tree, you can further restrict the maximum + current below the hardware limit. This requires the RFS + to be defined as it defines the maximum range. + + led-max-microamp: + maximum: 700000 + description: The maximum current for torch mode + is hardwired to the component using the RTS resistor to + ground. The maximum hardware current setting is calculated + according to the formula Imax = 5500 / RTS. The lowest + allowed resistance value is 7.86 kOhm giving an absolute + maximum current of 700mA. By setting this attribute in + the device tree, you can further restrict the maximum + current below the hardware limit. This requires the RTS + to be defined as it defines the maximum range. + +required: + - compatible + - ent-gpios + - enf-gpios + - led + +additionalProperties: false + +examples: + - | + #include + #include + + led-controller { + compatible = "richtek,rt8515"; + enf-gpios = <&gpio4 12 GPIO_ACTIVE_HIGH>; + ent-gpios = <&gpio4 13 GPIO_ACTIVE_HIGH>; + richtek,rfs-ohms = <16000>; + richtek,rts-ohms = <100000>; + + led { + function = LED_FUNCTION_FLASH; + color = ; + flash-max-timeout-us = <250000>; + flash-max-microamp = <150000>; + torch-max-microamp = <25000>; + }; + }; + +...