From patchwork Wed Apr 27 18:52:41 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Detlev Casanova X-Patchwork-Id: 566868 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 20952C433EF for ; Wed, 27 Apr 2022 19:03:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232126AbiD0TGh (ORCPT ); Wed, 27 Apr 2022 15:06:37 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59476 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231979AbiD0TGG (ORCPT ); Wed, 27 Apr 2022 15:06:06 -0400 Received: from bhuna.collabora.co.uk (bhuna.collabora.co.uk [IPv6:2a00:1098:0:82:1000:25:2eeb:e3e3]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 87C93B2456; Wed, 27 Apr 2022 11:53:12 -0700 (PDT) Received: from [127.0.0.1] (localhost [127.0.0.1]) (Authenticated sender: detlev) with ESMTPSA id 681B51F44C76 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=collabora.com; s=mail; t=1651085591; bh=zjj9bT7nqpGYLUD+MFiPjS+p1d3JG85znHGLCnosqsI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=RKdyXnstCooOeljI2Lcr7RIh46FK4AYDyreb8YFUpmbKEJVZv7+eFizmEncMypc6a 02eo/ksmJ3OSJEKrHcu/3J4uT8NYylIw0G5+dv+q7E0xaP6o6S6dSlxC5wObBqmVSR +NLKCxCbH1LQ3qVP0AGFC/GMW5O/YopOO6AcK8Yon6KIttKahWuyYCeh9TB9cXYiTJ E+jQ8nV5/fOQO4tkzJKqLgIaDhJO4kKpnfrzUQYW0DFWLSF9hzgNAexe1oS6DmNSeR JI7T/QxkvJ36fXZ12TWblAF6xlVDkLt0DYYPAGLHD/Pwe2klqYhLEb275jQM54jcNP XT9NWbluHBoyQ== From: Detlev Casanova To: linux-kernel@vger.kernel.org Cc: arnd@arndb.de, bcm-kernel-feedback-list@broadcom.com, devicetree@vger.kernel.org, f.fainelli@gmail.com, frowand.list@gmail.com, linux-arm-kernel@lists.infradead.org, linux-rpi-kernel@lists.infradead.org, masahiroy@kernel.org, michal.lkml@markovi.net, ndesaulniers@google.com, nsaenz@kernel.org, olof@lixom.net, rjui@broadcom.com, robh+dt@kernel.org, sbranden@broadcom.com, soc@kernel.org, stefan.wahren@i2se.com, Detlev Casanova Subject: [RFC PATCH v2 1/3] ARM: dts: bcm2*: Demux i2c0 with a pinctrl Date: Wed, 27 Apr 2022 14:52:41 -0400 Message-Id: <20220427185243.173594-2-detlev.casanova@collabora.com> X-Mailer: git-send-email 2.36.0 In-Reply-To: <20220427185243.173594-1-detlev.casanova@collabora.com> References: <20220427185243.173594-1-detlev.casanova@collabora.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org The i2c0 device has 2 different busses controlled by a pinctrl. This commit separates the device node into 2 i2c devices: * pin 0: Base i2c bus * pin 44: DSI i2c bus i2c0 is renamed to i2c0if so that device-trees referencing i2c0 don't break and use the i2c0 node defined in i2c0mux node. i2c_csi_dsi can be used to control devices via the DSI i2c bus, used for DSI displays. Signed-off-by: Detlev Casanova --- arch/arm/boot/dts/bcm2711-rpi-4-b.dts | 1 + arch/arm/boot/dts/bcm2711.dtsi | 2 +- arch/arm/boot/dts/bcm2835-rpi.dtsi | 9 ++++--- .../boot/dts/bcm283x-rpi-i2c0mux_0_44.dtsi | 4 +++ arch/arm/boot/dts/bcm283x.dtsi | 26 ++++++++++++++++++- 5 files changed, 37 insertions(+), 5 deletions(-) create mode 100644 arch/arm/boot/dts/bcm283x-rpi-i2c0mux_0_44.dtsi diff --git a/arch/arm/boot/dts/bcm2711-rpi-4-b.dts b/arch/arm/boot/dts/bcm2711-rpi-4-b.dts index 4432412044de..5dcce58817e6 100644 --- a/arch/arm/boot/dts/bcm2711-rpi-4-b.dts +++ b/arch/arm/boot/dts/bcm2711-rpi-4-b.dts @@ -4,6 +4,7 @@ #include "bcm2711-rpi.dtsi" #include "bcm283x-rpi-usb-peripheral.dtsi" #include "bcm283x-rpi-wifi-bt.dtsi" +#include "bcm283x-rpi-i2c0mux_0_44.dtsi" / { compatible = "raspberrypi,4-model-b", "brcm,bcm2711"; diff --git a/arch/arm/boot/dts/bcm2711.dtsi b/arch/arm/boot/dts/bcm2711.dtsi index dff18fc9a906..96209ed89c36 100644 --- a/arch/arm/boot/dts/bcm2711.dtsi +++ b/arch/arm/boot/dts/bcm2711.dtsi @@ -1045,7 +1045,7 @@ &cma { alloc-ranges = <0x0 0x00000000 0x40000000>; }; -&i2c0 { +&i2c0if { compatible = "brcm,bcm2711-i2c", "brcm,bcm2835-i2c"; interrupts = ; }; diff --git a/arch/arm/boot/dts/bcm2835-rpi.dtsi b/arch/arm/boot/dts/bcm2835-rpi.dtsi index 87ddcad76083..1e38f9f0e80e 100644 --- a/arch/arm/boot/dts/bcm2835-rpi.dtsi +++ b/arch/arm/boot/dts/bcm2835-rpi.dtsi @@ -49,13 +49,16 @@ alt0: alt0 { }; }; -&i2c0 { - pinctrl-names = "default"; - pinctrl-0 = <&i2c0_gpio0>; +&i2c0if { status = "okay"; clock-frequency = <100000>; }; +&i2c0mux { + pinctrl-0 = <&i2c0_gpio0>; + status = "okay"; +}; + &i2c1 { pinctrl-names = "default"; pinctrl-0 = <&i2c1_gpio2>; diff --git a/arch/arm/boot/dts/bcm283x-rpi-i2c0mux_0_44.dtsi b/arch/arm/boot/dts/bcm283x-rpi-i2c0mux_0_44.dtsi new file mode 100644 index 000000000000..119946d878db --- /dev/null +++ b/arch/arm/boot/dts/bcm283x-rpi-i2c0mux_0_44.dtsi @@ -0,0 +1,4 @@ +&i2c0mux { + pinctrl-0 = <&i2c0_gpio0>; + pinctrl-1 = <&i2c0_gpio44>; +}; diff --git a/arch/arm/boot/dts/bcm283x.dtsi b/arch/arm/boot/dts/bcm283x.dtsi index c113661a6668..62d7ee513549 100644 --- a/arch/arm/boot/dts/bcm283x.dtsi +++ b/arch/arm/boot/dts/bcm283x.dtsi @@ -336,7 +336,7 @@ spi: spi@7e204000 { status = "disabled"; }; - i2c0: i2c@7e205000 { + i2c0if: i2c@7e205000 { compatible = "brcm,bcm2835-i2c"; reg = <0x7e205000 0x200>; interrupts = <2 21>; @@ -346,6 +346,30 @@ i2c0: i2c@7e205000 { status = "disabled"; }; + i2c0mux: i2c0mux { + compatible = "i2c-mux-pinctrl"; + #address-cells = <1>; + #size-cells = <0>; + + i2c-parent = <&i2c0if>; + + pinctrl-names = "i2c0", "i2c_csi_dsi"; + + status = "disabled"; + + i2c0: i2c@0 { + reg = <0>; + #address-cells = <1>; + #size-cells = <0>; + }; + + i2c_csi_dsi: i2c@1 { + reg = <1>; + #address-cells = <1>; + #size-cells = <0>; + }; + }; + dpi: dpi@7e208000 { compatible = "brcm,bcm2835-dpi"; reg = <0x7e208000 0x8c>;