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=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,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 A72F2C432C3 for ; Tue, 19 Nov 2019 05:26:26 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 7FB0B21823 for ; Tue, 19 Nov 2019 05:26:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1574141186; bh=Q4mGNBQr66Q94q9GgnenfCd+MuSvKRlgye09kJ8YuMQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=J0lubsOkXuhgLUySytpX/4PwAxSe5kCFC6NT4K22b451g0UNMVMZzqf2RwKNveQEm s8kr/4OnMPhrtTdwSWKAVg/b8LhRxG+6ovwWGOm7VXlkWk3iUe+Y+ngHG6mKYHsXxu qBMVM9zB5MSuafzppVjtgG+i0jT+A9YgvRjbB7Ag= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728563AbfKSF0Z (ORCPT ); Tue, 19 Nov 2019 00:26:25 -0500 Received: from mail.kernel.org ([198.145.29.99]:44382 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727718AbfKSF0V (ORCPT ); Tue, 19 Nov 2019 00:26:21 -0500 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id C06AA21823; Tue, 19 Nov 2019 05:26:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1574141181; bh=Q4mGNBQr66Q94q9GgnenfCd+MuSvKRlgye09kJ8YuMQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=dV/T2qsZarKvrLUKpGXyBAWvujHUJljr3ipsdGSHw//Hq1lngsy5bbOFeMNcV/WH5 lCtCsClo6Zs0sqdrYDbtjdqV/BkuebvVHlnisrF7qI4fnCWvx3jba8yReaDGS7txdf uz5LV2aRMhtYBjDSqdN9bugaWAtLrgDa2SCj1AdY= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Andrzej Hajda , Krzysztof Kozlowski , Sasha Levin Subject: [PATCH 4.19 072/422] ARM: dts: exynos: Use i2c-gpio for HDMI-DDC on Arndale Date: Tue, 19 Nov 2019 06:14:29 +0100 Message-Id: <20191119051404.265698564@linuxfoundation.org> X-Mailer: git-send-email 2.24.0 In-Reply-To: <20191119051400.261610025@linuxfoundation.org> References: <20191119051400.261610025@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 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