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([59.188.211.160]) by smtp.googlemail.com with ESMTPSA id d2e1a72fcca58-72d406a57dcsm1333403b3a.170.2025.01.10.02.53.31 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 10 Jan 2025 02:53:34 -0800 (PST) From: Nick Chan To: Hector Martin , Sven Peter , Alyssa Rosenzweig , Lee Jones , Daniel Thompson , Jingoo Han , Pavel Machek , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Helge Deller , Nick Chan , asahi@lists.linux.dev, linux-arm-kernel@lists.infradead.org, dri-devel@lists.freedesktop.org, linux-leds@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-fbdev@vger.kernel.org Cc: Krzysztof Kozlowski Subject: [PATCH v5 1/3] dt-bindings: leds: backlight: apple,dwi-bl: Add Apple DWI backlight Date: Fri, 10 Jan 2025 18:52:04 +0800 Message-ID: <20250110105304.71142-2-towinchenmi@gmail.com> X-Mailer: git-send-email 2.47.1 In-Reply-To: <20250110105304.71142-1-towinchenmi@gmail.com> References: <20250110105304.71142-1-towinchenmi@gmail.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250110_025336_000305_A7DE9D92 X-CRM114-Status: GOOD ( 13.58 ) X-BeenThere: linux-arm-kernel@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-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Add backlight controllers attached via Apple DWI 2-wire interface. Reviewed-by: Krzysztof Kozlowski Reviewed-by: Daniel Thompson (RISCstar) Signed-off-by: Nick Chan --- .../bindings/leds/backlight/apple,dwi-bl.yaml | 57 +++++++++++++++++++ 1 file changed, 57 insertions(+) create mode 100644 Documentation/devicetree/bindings/leds/backlight/apple,dwi-bl.yaml diff --git a/Documentation/devicetree/bindings/leds/backlight/apple,dwi-bl.yaml b/Documentation/devicetree/bindings/leds/backlight/apple,dwi-bl.yaml new file mode 100644 index 000000000000..29caeb356e6f --- /dev/null +++ b/Documentation/devicetree/bindings/leds/backlight/apple,dwi-bl.yaml @@ -0,0 +1,57 @@ +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/leds/backlight/apple,dwi-bl.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Apple DWI 2-Wire Interface Backlight Controller + +maintainers: + - Nick Chan + +description: + Apple SoCs contain a 2-wire interface called DWI. On some Apple iPhones, + iPads and iPod touches with a LCD display, 1-2 backlight controllers + are connected via DWI. Interfacing with DWI controls all backlight + controllers at the same time. As such, the backlight controllers are + treated as a single controller regardless of the underlying + configuration. + +allOf: + - $ref: common.yaml# + +properties: + compatible: + items: + - enum: + - apple,s5l8960x-dwi-bl + - apple,t7000-dwi-bl + - apple,s8000-dwi-bl + - apple,t8010-dwi-bl + - apple,t8015-dwi-bl + - const: apple,dwi-bl + + reg: + maxItems: 1 + + power-domains: + maxItems: 1 + +required: + - compatible + - reg + +unevaluatedProperties: false + +examples: + - | + soc { + #address-cells = <2>; + #size-cells = <2>; + + dwi_bl: backlight@20e200010 { + compatible = "apple,s5l8960x-dwi-bl", "apple,dwi-bl"; + reg = <0x2 0x0e200010 0x0 0x8>; + power-domains = <&ps_dwi>; + }; + }; From patchwork Fri Jan 10 10:52:05 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nick Chan X-Patchwork-Id: 13934258 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 D4831E77188 for ; Fri, 10 Jan 2025 10:57:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:To:From:Reply-To: Cc:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=nh6xwMih9t2P8bSHc/qwvE7dR1ONV0eR5UnEn/Ji1oc=; b=M17qKVJqAk8b+CbkVVBaweIbUp 9PHA2oCHtsA1NU6m7dT1E1HKBpQW3HvOH0ggfEk1kTwnfXJTcusNK/jzIn7vT8hT3i0+ORNXfnbe5 ukG/zbEATPenjA8wYzx1RkkBmq4QYZEX4cDnmj1AF3RtWQO36/taXp8tOxr4y7bD1YuVG63gkhoxZ uZBIbRc0EmnKIRPXi+2OkYEJz0wf61/wL7spfO9b7ryJT22/8YZDAvn4axJMUiSk8G4U1y2V+/2+N sythETMq7b2AJZnl1KRUzV739aJN1S0S2nmax05L0KsiDnCnkmpmoYIJcQDhm4xFQgDdL1rP2wC7Y B9ILGibQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1tWChT-0000000F24P-3x7d; Fri, 10 Jan 2025 10:57:11 +0000 Received: from mail-pl1-x629.google.com ([2607:f8b0:4864:20::629]) by bombadil.infradead.org with esmtps (Exim 4.98 #2 (Red Hat Linux)) id 1tWCe3-0000000F1UF-3x34 for linux-arm-kernel@lists.infradead.org; Fri, 10 Jan 2025 10:53:41 +0000 Received: by mail-pl1-x629.google.com with SMTP id d9443c01a7336-2162c0f6a39so52676745ad.0 for ; Fri, 10 Jan 2025 02:53:39 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1736506419; x=1737111219; darn=lists.infradead.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:to:from:from:to:cc:subject:date:message-id :reply-to; bh=nh6xwMih9t2P8bSHc/qwvE7dR1ONV0eR5UnEn/Ji1oc=; b=gdajxUkxACTdiOYpCEX6EYs4qVfZZPvAXtgi7VNyP3X31kQuLdtwULXI9a8FyD7tWD 7FJscOgeJTPYDiOz8uAdcjp9KnG+b3jblRu/7aTDWzOOYCvtJZH7uUpnjmaDXkseXR/9 3uC5JWz1RNERiJTODRuVDOg6t8ZNh/EgJwuQA3awU4gKSwjJUqetY2IqAdpUhaH5yriO hvFFdpUY1BsKkz2fdPp+bRWoVxLQa7/T3hfMVE7HvPZdOJZh6RZsNcbTFqwVFbH7Mohm 9tTWc/V4Zhf6XYCzvltMe13UWhQlj1ipB46JIVR9hpYRE9qg/55QvlS76IMaWPttr0I1 HkYw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1736506419; x=1737111219; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=nh6xwMih9t2P8bSHc/qwvE7dR1ONV0eR5UnEn/Ji1oc=; b=E8Bpp660zUKN9FPiaMoOhrLbdHP81JBVWOpgXBbE2NOupsIAKaC8AN0O0hg/yo/a+E vZxLH5WE6anNyyLA/aWyd6HBQ7hif27nlsSmd8+bw886PV4CckDqNOUdaYVSGiTIRc+C lGM3X8NufeNJVdL3FA+i9jCsijMC1Az0M9VVeUhD1WbfqdDWZkBAiBPPPQci3Owmdrw3 YyfcwEHq1dkK+kDas/JqlWfLKSeNUVqrGUDU3iZd01jDTauFn0OU4kDrFR3V3D8l8yyh yz/IDnVoZQfir9OulKjaBTSCAFHqI4bud03fGvq3vxLAIm403TBziakK++57K7L3ywJt c4AQ== X-Forwarded-Encrypted: i=1; AJvYcCWJeOSduIjXts1Ahfsw/b9SSKi4HEu9xDGf7IwVk5UHgGXO/Ed6Uspm56l28jG+vOAMoMXpFFJhWYjZOqLAlVip@lists.infradead.org X-Gm-Message-State: AOJu0Yy9Ksp1TJN7k2RevjibA/4iOAbvmoHutvPjCrASTA8/du/UOtBL aADSlefb8wUFKzV7oJvdzUH7ykTJ94fhtWcbjd9ZfFZb9qI8+6FV X-Gm-Gg: ASbGnctyvVAZJEPgy5Vk74rDjeSu39VV72zRycFR4QcLP4U/uTfuYHnkGOuN1cEEQn4 9o623I4Jvx34L9OZtehQYx63aPDW9gTSvXX87YiLI6sejxoHCTg4qH0Kg/R8qboNSmOjHhxIE26 qknoTcqM84ormBhQQPJ2l3DrGriXHzNm+LGizs2qN/TZNCUwatRiglgxn39hylh7La0U9q/6pZZ hc6Dg4J49pLJ93Y7HJgE3pwLQ2j64wMl4KYgiv6viQf7KQnB/G6Up4ufg== X-Google-Smtp-Source: AGHT+IFKPN2XI793AfBIiNWSp2Q2nh1umRCT8qWiYft+E5B1hLK6XOeAjDZY3jeTnrRaKDwUjRNE8g== X-Received: by 2002:a05:6a00:3bc9:b0:727:39a4:30cc with SMTP id d2e1a72fcca58-72d30301d86mr7980627b3a.1.1736506419152; Fri, 10 Jan 2025 02:53:39 -0800 (PST) Received: from nick-mbp.. ([59.188.211.160]) by smtp.googlemail.com with ESMTPSA id d2e1a72fcca58-72d406a57dcsm1333403b3a.170.2025.01.10.02.53.35 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 10 Jan 2025 02:53:38 -0800 (PST) From: Nick Chan To: Hector Martin , Sven Peter , Alyssa Rosenzweig , Lee Jones , Daniel Thompson , Jingoo Han , Pavel Machek , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Helge Deller , Nick Chan , asahi@lists.linux.dev, linux-arm-kernel@lists.infradead.org, dri-devel@lists.freedesktop.org, linux-leds@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-fbdev@vger.kernel.org Subject: [PATCH v5 2/3] backlight: apple_dwi_bl: Add Apple DWI backlight driver Date: Fri, 10 Jan 2025 18:52:05 +0800 Message-ID: <20250110105304.71142-3-towinchenmi@gmail.com> X-Mailer: git-send-email 2.47.1 In-Reply-To: <20250110105304.71142-1-towinchenmi@gmail.com> References: <20250110105304.71142-1-towinchenmi@gmail.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250110_025339_984776_939A1CED X-CRM114-Status: GOOD ( 24.33 ) X-BeenThere: linux-arm-kernel@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-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Add driver for backlight controllers attached via Apple DWI 2-wire interface, which is found on some Apple iPhones, iPads and iPod touches with a LCD display. Although there is an existing apple_bl driver, it is for backlight controllers on Intel Macs attached via PCI, which is completely different from the Samsung-derived DWI block. Signed-off-by: Nick Chan --- drivers/video/backlight/Kconfig | 12 +++ drivers/video/backlight/Makefile | 1 + drivers/video/backlight/apple_dwi_bl.c | 123 +++++++++++++++++++++++++ 3 files changed, 136 insertions(+) create mode 100644 drivers/video/backlight/apple_dwi_bl.c diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig index 3614a5d29c71..c6168727900a 100644 --- a/drivers/video/backlight/Kconfig +++ b/drivers/video/backlight/Kconfig @@ -290,6 +290,18 @@ config BACKLIGHT_APPLE If you have an Intel-based Apple say Y to enable a driver for its backlight. +config BACKLIGHT_APPLE_DWI + tristate "Apple DWI 2-Wire Interface Backlight Driver" + depends on ARCH_APPLE || COMPILE_TEST + default y + help + Say Y to enable the backlight driver for backlight controllers + attached via the Apple DWI 2-wire interface which is found in some + Apple iPhones, iPads and iPod touches. + + To compile this driver as a module, choose M here: the module will + be called apple_dwi_bl. + config BACKLIGHT_QCOM_WLED tristate "Qualcomm PMIC WLED Driver" select REGMAP diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile index 8fc98f760a8a..156ff9461fb3 100644 --- a/drivers/video/backlight/Makefile +++ b/drivers/video/backlight/Makefile @@ -23,6 +23,7 @@ obj-$(CONFIG_BACKLIGHT_ADP5520) += adp5520_bl.o obj-$(CONFIG_BACKLIGHT_ADP8860) += adp8860_bl.o obj-$(CONFIG_BACKLIGHT_ADP8870) += adp8870_bl.o obj-$(CONFIG_BACKLIGHT_APPLE) += apple_bl.o +obj-$(CONFIG_BACKLIGHT_APPLE_DWI) += apple_dwi_bl.o obj-$(CONFIG_BACKLIGHT_AS3711) += as3711_bl.o obj-$(CONFIG_BACKLIGHT_BD6107) += bd6107.o obj-$(CONFIG_BACKLIGHT_CLASS_DEVICE) += backlight.o diff --git a/drivers/video/backlight/apple_dwi_bl.c b/drivers/video/backlight/apple_dwi_bl.c new file mode 100644 index 000000000000..93bd744972d6 --- /dev/null +++ b/drivers/video/backlight/apple_dwi_bl.c @@ -0,0 +1,123 @@ +// SPDX-License-Identifier: GPL-2.0 OR MIT +/* + * Driver for backlight controllers attached via Apple DWI 2-wire interface + * + * Copyright (c) 2024 Nick Chan + */ + +#include +#include +#include +#include +#include +#include + +#define DWI_BL_CTL 0x0 +#define DWI_BL_CTL_SEND1 BIT(0) +#define DWI_BL_CTL_SEND2 BIT(4) +#define DWI_BL_CTL_SEND3 BIT(5) +#define DWI_BL_CTL_LE_DATA BIT(6) +/* Only used on Apple A9 and later */ +#define DWI_BL_CTL_SEND4 BIT(12) + +#define DWI_BL_CMD 0x4 +#define DWI_BL_CMD_TYPE GENMASK(31, 28) +#define DWI_BL_CMD_TYPE_SET_BRIGHTNESS 0xa +#define DWI_BL_CMD_DATA GENMASK(10, 0) + +#define DWI_BL_CTL_SEND (DWI_BL_CTL_SEND1 | \ + DWI_BL_CTL_SEND2 | \ + DWI_BL_CTL_SEND3 | \ + DWI_BL_CTL_LE_DATA | \ + DWI_BL_CTL_SEND4) + +#define DWI_BL_MAX_BRIGHTNESS 2047 + +struct apple_dwi_bl { + void __iomem *base; +}; + +static int dwi_bl_update_status(struct backlight_device *bl) +{ + struct apple_dwi_bl *dwi_bl = bl_get_data(bl); + + int brightness = backlight_get_brightness(bl); + + u32 cmd = 0; + + cmd |= FIELD_PREP(DWI_BL_CMD_DATA, brightness); + cmd |= FIELD_PREP(DWI_BL_CMD_TYPE, DWI_BL_CMD_TYPE_SET_BRIGHTNESS); + + writel(cmd, dwi_bl->base + DWI_BL_CMD); + writel(DWI_BL_CTL_SEND, dwi_bl->base + DWI_BL_CTL); + + return 0; +} + +static int dwi_bl_get_brightness(struct backlight_device *bl) +{ + struct apple_dwi_bl *dwi_bl = bl_get_data(bl); + + u32 cmd = readl(dwi_bl->base + DWI_BL_CMD); + + return FIELD_GET(DWI_BL_CMD_DATA, cmd); +} + +static const struct backlight_ops dwi_bl_ops = { + .options = BL_CORE_SUSPENDRESUME, + .get_brightness = dwi_bl_get_brightness, + .update_status = dwi_bl_update_status +}; + +static int dwi_bl_probe(struct platform_device *dev) +{ + struct apple_dwi_bl *dwi_bl; + struct backlight_device *bl; + struct backlight_properties props; + struct resource *res; + + dwi_bl = devm_kzalloc(&dev->dev, sizeof(*dwi_bl), GFP_KERNEL); + if (!dwi_bl) + return -ENOMEM; + + dwi_bl->base = devm_platform_get_and_ioremap_resource(dev, 0, &res); + if (IS_ERR(dwi_bl->base)) + return PTR_ERR(dwi_bl->base); + + memset(&props, 0, sizeof(struct backlight_properties)); + props.type = BACKLIGHT_PLATFORM; + props.max_brightness = DWI_BL_MAX_BRIGHTNESS; + props.scale = BACKLIGHT_SCALE_LINEAR; + + bl = devm_backlight_device_register(&dev->dev, dev->name, &dev->dev, + dwi_bl, &dwi_bl_ops, &props); + if (IS_ERR(bl)) + return PTR_ERR(bl); + + platform_set_drvdata(dev, dwi_bl); + + bl->props.brightness = dwi_bl_get_brightness(bl); + + return 0; +} + +static const struct of_device_id dwi_bl_of_match[] = { + { .compatible = "apple,dwi-bl" }, + {}, +}; + +MODULE_DEVICE_TABLE(of, dwi_bl_of_match); + +static struct platform_driver dwi_bl_driver = { + .driver = { + .name = "apple-dwi-bl", + .of_match_table = dwi_bl_of_match + }, + .probe = dwi_bl_probe, +}; + +module_platform_driver(dwi_bl_driver); + +MODULE_DESCRIPTION("Apple DWI Backlight Driver"); 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([59.188.211.160]) by smtp.googlemail.com with ESMTPSA id d2e1a72fcca58-72d406a57dcsm1333403b3a.170.2025.01.10.02.53.39 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 10 Jan 2025 02:53:42 -0800 (PST) From: Nick Chan To: Hector Martin , Sven Peter , Alyssa Rosenzweig , Lee Jones , Daniel Thompson , Jingoo Han , Pavel Machek , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Helge Deller , Nick Chan , asahi@lists.linux.dev, linux-arm-kernel@lists.infradead.org, dri-devel@lists.freedesktop.org, linux-leds@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-fbdev@vger.kernel.org Subject: [PATCH v5 3/3] MAINTAINERS: Add entries for Apple DWI backlight controller Date: Fri, 10 Jan 2025 18:52:06 +0800 Message-ID: <20250110105304.71142-4-towinchenmi@gmail.com> X-Mailer: git-send-email 2.47.1 In-Reply-To: <20250110105304.71142-1-towinchenmi@gmail.com> References: <20250110105304.71142-1-towinchenmi@gmail.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250110_025344_048733_540B7965 X-CRM114-Status: GOOD ( 11.25 ) X-BeenThere: linux-arm-kernel@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-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Add MAINTAINERS entries for the driver. Reviewed-by: Daniel Thompson (RISCstar) Signed-off-by: Nick Chan --- MAINTAINERS | 2 ++ 1 file changed, 2 insertions(+) diff --git a/MAINTAINERS b/MAINTAINERS index 910305c11e8a..67ad74f987c8 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -2196,6 +2196,7 @@ F: Documentation/devicetree/bindings/i2c/apple,i2c.yaml F: Documentation/devicetree/bindings/interrupt-controller/apple,* F: Documentation/devicetree/bindings/iommu/apple,dart.yaml F: Documentation/devicetree/bindings/iommu/apple,sart.yaml +F: Documentation/devicetree/bindings/leds/backlight/apple,dwi-bl.yaml F: Documentation/devicetree/bindings/mailbox/apple,mailbox.yaml F: Documentation/devicetree/bindings/net/bluetooth/brcm,bcm4377-bluetooth.yaml F: Documentation/devicetree/bindings/nvme/apple,nvme-ans.yaml @@ -2221,6 +2222,7 @@ F: drivers/nvmem/apple-efuses.c F: drivers/pinctrl/pinctrl-apple-gpio.c F: drivers/pwm/pwm-apple.c F: drivers/soc/apple/* +F: drivers/video/backlight/apple_dwi_bl.c F: drivers/watchdog/apple_wdt.c F: include/dt-bindings/interrupt-controller/apple-aic.h F: include/dt-bindings/pinctrl/apple.h