[v2,0/3] i2c: gpio: support write-only sda

Message ID	3e6c934e-5298-42c5-c346-31b1acaa06ba@gmail.com
Headers	show Return-Path: <linux-i2c-owner@kernel.org> Message-ID: <3e6c934e-5298-42c5-c346-31b1acaa06ba@gmail.com> Date: Wed, 27 Apr 2022 21:20:40 +0200 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101 Thunderbird/91.8.1 From: Heiner Kallweit <hkallweit1@gmail.com> Subject: [PATCH v2 0/3] i2c: gpio: support write-only sda To: Rob Herring <robh+dt@kernel.org>, Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>, Wolfram Sang <wsa@kernel.org>, Wolfram Sang <wsa+renesas@sang-engineering.com> Cc: "linux-i2c@vger.kernel.org" <linux-i2c@vger.kernel.org>, "devicetree@vger.kernel.org" <devicetree@vger.kernel.org> Content-Language: en-US Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Precedence: bulk
Series	i2c: gpio: support write-only sda \| expand [v2,0/3] i2c: gpio: support write-only sda [v2,1/3] dt-bindings: i2c-gpio: Add property i2c-gpio,sda-output-only [v2,2/3] i2c: algo: bit: allow getsda to be NULL [v2,3/3] i2c: gpio: support write-only sda

Message ID

3e6c934e-5298-42c5-c346-31b1acaa06ba@gmail.com

Headers

Message-ID: <3e6c934e-5298-42c5-c346-31b1acaa06ba@gmail.com>
Date: Wed, 27 Apr 2022 21:20:40 +0200
MIME-Version: 1.0
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101
 Thunderbird/91.8.1
From: Heiner Kallweit <hkallweit1@gmail.com>
Subject: [PATCH v2 0/3] i2c: gpio: support write-only sda
To: Rob Herring <robh+dt@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Wolfram Sang <wsa@kernel.org>,
        Wolfram Sang <wsa+renesas@sang-engineering.com>
Cc: "linux-i2c@vger.kernel.org" <linux-i2c@vger.kernel.org>,
        "devicetree@vger.kernel.org" <devicetree@vger.kernel.org>
Content-Language: en-US
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 7bit
Precedence: bulk

Series

i2c: gpio: support write-only sda | expand

Message

Heiner Kallweit April 27, 2022, 7:20 p.m. UTC

There are slave devices that understand I2C but have read-only
SDA and SCL. Examples are FD650 7-segment LED controller and
its derivatives. Typical board designs don't even have a
pull-up for both pins. This patch makes i2c-gpio usable with
such devices, based on new DT property i2c-gpio,sda-output-only.

v2:
- improve commit message for patch 1

Heiner Kallweit (3):
  dt-bindings: i2c-gpio: Add property i2c-gpio,sda-output-only
  i2c: algo: bit: allow getsda to be NULL
  i2c: gpio: support write-only sda

 .../devicetree/bindings/i2c/i2c-gpio.yaml        |  4 ++++
 drivers/i2c/algos/i2c-algo-bit.c                 | 16 +++++++++++++---
 drivers/i2c/busses/i2c-gpio.c                    | 14 +++++++++++---
 include/linux/platform_data/i2c-gpio.h           |  2 ++
 4 files changed, 30 insertions(+), 6 deletions(-)