From patchwork Tue Sep 17 23:29:31 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Chris Packham X-Patchwork-Id: 829296 Received: from gate2.alliedtelesis.co.nz (gate2.alliedtelesis.co.nz [202.36.163.20]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 10D3B1925A3 for ; Tue, 17 Sep 2024 23:29:44 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=202.36.163.20 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726615787; cv=none; b=MaY824K8WxWHQwcq5CJmiR5lFAqBwfx3LBepLqMXR7CRkpknJgzzhPPWCZ7apFnejjgnEjb6Dlk+kJWYJ3VvOjonVJxHpZXWIKvOYq8DdeKUyveoZwqmfpbSBDnswhAi4PlFhpnDld1J6LVT8rvrG2A2/DT7J+AZmEFdFVaysUI= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726615787; c=relaxed/simple; bh=4XKWbHDH3k5IZJIEee2ZDxN3yH0PLm7mX4JK9TUlNuk=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=ulzPYA3Ga09kgYBbshT9sPyLavRTbfdAMy17v/HlIlY3n0SvimmINnLWA36s0+zLUWldt54gZ9055bm8xngVyunCKE6k0WJjdVSA+w7xO7+4M5dHFpVHlnPKzkkg7Owc9UkFXfrnATq2yXdTa6SL584QLZbfL6SX8XNaLzR0XZc= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=alliedtelesis.co.nz; spf=pass smtp.mailfrom=alliedtelesis.co.nz; dkim=pass (2048-bit key) header.d=alliedtelesis.co.nz header.i=@alliedtelesis.co.nz header.b=cvef+SEg; arc=none smtp.client-ip=202.36.163.20 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=alliedtelesis.co.nz Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=alliedtelesis.co.nz Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=alliedtelesis.co.nz header.i=@alliedtelesis.co.nz header.b="cvef+SEg" Received: from svr-chch-seg1.atlnz.lc (mmarshal3.atlnz.lc [10.32.18.43]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (Client did not present a certificate) by gate2.alliedtelesis.co.nz (Postfix) with ESMTPS id 3F1C62C062F; Wed, 18 Sep 2024 11:29:37 +1200 (NZST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=alliedtelesis.co.nz; s=mail181024; t=1726615777; bh=Es0GKGajP1taBUIavduYfU2QHg3cC2kreSbopHTF+4o=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=cvef+SEgMoyot37PMHr5cFPQaUjNYKb8v1gut1BR8Lwzcdim7IFAMCiw8Kg69edFX V2rh09K4HJMOr2X4EEYdeB5mjWlCV4aTvowRDfD7DLGZOcHOv1hMJwwuafE+zL1kkn wMHyQnSZhBise6oPG+LK9dLgkAFgaFy0vHX0SuCEWAy+WMh8Wh8H965YpNa/7kX4pK pUIqnbBC5DMYU7E6wMxMlxUJtjpEpAltnhjxXBeA8Q8ES32QFihpYmqrgCFROTAEGF QOFD2sSR8BRM0sl7U/gh6GdbXgS3hD/umkhMm4WpMIfFuyf67wM7kU8LBxrFlyBJ9X QdZJIooD0GNmA== Received: from pat.atlnz.lc (Not Verified[10.32.16.33]) by svr-chch-seg1.atlnz.lc with Trustwave SEG (v8,2,6,11305) id ; Wed, 18 Sep 2024 11:29:36 +1200 Received: from chrisp-dl.ws.atlnz.lc (chrisp-dl.ws.atlnz.lc [10.33.22.30]) by pat.atlnz.lc (Postfix) with ESMTP id 86F4513ED56; Wed, 18 Sep 2024 11:29:36 +1200 (NZST) Received: by chrisp-dl.ws.atlnz.lc (Postfix, from userid 1030) id 840AF280347; Wed, 18 Sep 2024 11:29:36 +1200 (NZST) From: Chris Packham To: andi.shyti@kernel.org, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, tsbogend@alpha.franken.de Cc: linux-i2c@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mips@vger.kernel.org, Chris Packham Subject: [PATCH 4/5] dt-bindings: i2c: Add RTL9300 I2C multiplexer Date: Wed, 18 Sep 2024 11:29:31 +1200 Message-ID: <20240917232932.3641992-5-chris.packham@alliedtelesis.co.nz> X-Mailer: git-send-email 2.46.1 In-Reply-To: <20240917232932.3641992-1-chris.packham@alliedtelesis.co.nz> References: <20240917232932.3641992-1-chris.packham@alliedtelesis.co.nz> Precedence: bulk X-Mailing-List: linux-i2c@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-SEG-SpamProfiler-Analysis: v=2.4 cv=Id0kWnqa c=1 sm=1 tr=0 ts=66ea10e0 a=KLBiSEs5mFS1a/PbTCJxuA==:117 a=EaEq8P2WXUwA:10 a=gEfo2CItAAAA:8 a=VwQbUJbxAAAA:8 a=8lrFv0nGYZjcjRuYp20A:9 a=3ZKOabzyN94A:10 a=sptkURWiP4Gy88Gu7hUp:22 X-SEG-SpamProfiler-Score: 0 x-atlnz-ls: pat An extension of the RTL9300 SoC is to support multiplexing by selecting the SDA pins that are being used dynamically. Add a binding that allows us to describe hardware that makes use of this. Signed-off-by: Chris Packham --- .../bindings/i2c/realtek,rtl9300-i2c-mux.yaml | 82 +++++++++++++++++++ MAINTAINERS | 1 + 2 files changed, 83 insertions(+) create mode 100644 Documentation/devicetree/bindings/i2c/realtek,rtl9300-i2c-mux.yaml diff --git a/Documentation/devicetree/bindings/i2c/realtek,rtl9300-i2c-mux.yaml b/Documentation/devicetree/bindings/i2c/realtek,rtl9300-i2c-mux.yaml new file mode 100644 index 000000000000..a64879d0fda7 --- /dev/null +++ b/Documentation/devicetree/bindings/i2c/realtek,rtl9300-i2c-mux.yaml @@ -0,0 +1,82 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/i2c/realtek,rtl9300-i2c-mux.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Realtek RTL I2C Multiplexer + +maintainers: + - Chris Packham + +description: | + The I2C controllers on the RTL9300 support a level of multiplexing. In the + simple case the rtl9300-i2c binding can provide a single SDA pin per + controller. This binding allows a more than one SDA line to be used per + controller providing a level of multiplexing. + +properties: + compatible: + const: realtek,rtl9300-i2c-mux + + i2c-parent: + description: phandle of the I2C bus controller that this multiplexer + operates on. + $ref: /schemas/types.yaml#/definitions/phandle + +allOf: + - $ref: i2c-mux.yaml + +unevaluatedProperties: false + +required: + - compatible + - i2c-parent + +examples: + - | + switch@1b000000 { + compatible = "realtek,rtl9302c-switch", "syscon", "simple-mfd"; + reg = <0x1b000000 0x10000>; + + i2c0: i2c@36c { + compatible = "realtek,rtl9300-i2c"; + realtek,control-offset = <0x36c>; + realtek,global-control-offset = <0x384>; + #address-cells = <1>; + #size-cells = <0>; + }; + }; + + base { + i2c-mux { + compatible = "realtek,rtl9300-i2c-mux"; + #address-cells = <1>; + #size-cells = <0>; + i2c-parent = <&i2c0>; + + i2c@0 { + reg = <0>; + #address-cells = <1>; + #size-cells = <0>; + gpio@20 { + compatible = "nxp,pca9555"; + gpio-controller; + #gpio-cells = <2>; + reg = <0x20>; + }; + }; + + i2c@2 { + reg = <2>; + #address-cells = <1>; + #size-cells = <0>; + gpio@20 { + compatible = "nxp,pca9555"; + gpio-controller; + #gpio-cells = <2>; + reg = <0x20>; + }; + }; + }; + }; diff --git a/MAINTAINERS b/MAINTAINERS index 9e123e9839a5..178ac8a7e843 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -19891,6 +19891,7 @@ RTL9300 I2C DRIVER (rtl9300-i2c) M: Chris Packham L: linux-i2c@vger.kernel.org S: Maintained +F: Documentation/devicetree/bindings/i2c/realtek,rtl9300-i2c-mux.yaml F: Documentation/devicetree/bindings/i2c/realtek,rtl9300-i2c.yaml F: drivers/i2c/busses/i2c-rtl9300.c