From mboxrd@z Thu Jan 1 00:00:00 1970 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=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham 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 80F3AFA372C for ; Fri, 8 Nov 2019 12:12:44 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 5592620656 for ; Fri, 8 Nov 2019 12:12:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1573215164; bh=Q4mGNBQr66Q94q9GgnenfCd+MuSvKRlgye09kJ8YuMQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=gdxfF9iQ0w0iQHEUD8Kny/PIgnhA0cjFLyymS3aKAJA5WVnGUUs9thOpVDAEW5sWM Iy9gH4+eI3Pt/HzfOU7VP13ox/Mq4QcoE0KGFH7qoc3SJ+hrXAAQuJ9sjbTchrP3Le 2qUngcUSHp2NaKFsu9saKcy04VqBA8LkyhxiWfuQ= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2403781AbfKHMMn (ORCPT ); Fri, 8 Nov 2019 07:12:43 -0500 Received: from mail.kernel.org ([198.145.29.99]:51640 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732771AbfKHLil (ORCPT ); Fri, 8 Nov 2019 06:38:41 -0500 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 655E421D6C; Fri, 8 Nov 2019 11:38:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1573213121; bh=Q4mGNBQr66Q94q9GgnenfCd+MuSvKRlgye09kJ8YuMQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=IlPVRw/hJOxJNi5OclxYXM1GMNU30Y7f6Oq3eXWL8UmxrUv8k4Dbjp9l1KJdO67sW jRb++jGVc0wbBx446EMctI3Ea9ktvcMDPYi99Ju5O6rPUO4lpwE7REIWsB3eYKh6Ln qiBXi0dCDyL3V3Nqjev+k7V9htNh+3ZWYDrBcTqo= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Andrzej Hajda , Krzysztof Kozlowski , Sasha Levin , devicetree@vger.kernel.org Subject: [PATCH AUTOSEL 4.19 040/205] ARM: dts: exynos: Use i2c-gpio for HDMI-DDC on Arndale Date: Fri, 8 Nov 2019 06:35:07 -0500 Message-Id: <20191108113752.12502-40-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20191108113752.12502-1-sashal@kernel.org> References: <20191108113752.12502-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Andrzej Hajda [ Upstream commit 620375c8fdf2f9f5110ed48d6c407cc4b7554f86 ] HDMI-DDC for unknown reasons doesn't work with Exynos I2C controllers. Fortunately i2c-gpio comes to the rescue. Signed-off-by: Andrzej Hajda Signed-off-by: Krzysztof Kozlowski Signed-off-by: Sasha Levin --- arch/arm/boot/dts/exynos5250-arndale.dts | 28 ++++++++++++++++------- arch/arm/boot/dts/exynos5250-pinctrl.dtsi | 6 +++++ 2 files changed, 26 insertions(+), 8 deletions(-) diff --git a/arch/arm/boot/dts/exynos5250-arndale.dts b/arch/arm/boot/dts/exynos5250-arndale.dts index 7a8a5c55701a8..bb3fcd652b5d7 100644 --- a/arch/arm/boot/dts/exynos5250-arndale.dts +++ b/arch/arm/boot/dts/exynos5250-arndale.dts @@ -150,7 +150,7 @@ &hdmi { status = "okay"; - ddc = <&i2c_2>; + ddc = <&i2c_ddc>; hpd-gpios = <&gpx3 7 GPIO_ACTIVE_LOW>; vdd_osc-supply = <&ldo10_reg>; vdd_pll-supply = <&ldo8_reg>; @@ -452,13 +452,6 @@ }; }; -&i2c_2 { - status = "okay"; - /* used by HDMI DDC */ - samsung,i2c-sda-delay = <100>; - samsung,i2c-max-bus-freq = <66000>; -}; - &i2c_3 { status = "okay"; @@ -547,3 +540,22 @@ status = "okay"; samsung,exynos-sataphy-i2c-phandle = <&sata_phy_i2c>; }; + +&soc { + /* + * For unknown reasons HDMI-DDC does not work with Exynos I2C + * controllers. Lets use software I2C over GPIO pins as a workaround. + */ + i2c_ddc: i2c-gpio { + pinctrl-names = "default"; + pinctrl-0 = <&i2c2_gpio_bus>; + status = "okay"; + compatible = "i2c-gpio"; + gpios = <&gpa0 6 0 /* sda */ + &gpa0 7 0 /* scl */ + >; + i2c-gpio,delay-us = <2>; + #address-cells = <1>; + #size-cells = <0>; + }; +}; diff --git a/arch/arm/boot/dts/exynos5250-pinctrl.dtsi b/arch/arm/boot/dts/exynos5250-pinctrl.dtsi index 6ff6dea29d449..b25d520393b8b 100644 --- a/arch/arm/boot/dts/exynos5250-pinctrl.dtsi +++ b/arch/arm/boot/dts/exynos5250-pinctrl.dtsi @@ -225,6 +225,12 @@ samsung,pin-drv = ; }; + i2c2_gpio_bus: i2c2-gpio-bus { + samsung,pins = "gpa0-6", "gpa0-7"; + samsung,pin-pud = ; + samsung,pin-drv = ; + }; + uart2_data: uart2-data { samsung,pins = "gpa1-0", "gpa1-1"; samsung,pin-function = ; -- 2.20.1