From patchwork Tue Jan 17 20:39:23 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Heiner Kallweit X-Patchwork-Id: 643572 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 463FFC677F1 for ; Tue, 17 Jan 2023 21:59:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229595AbjAQV7V (ORCPT ); Tue, 17 Jan 2023 16:59:21 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42448 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229696AbjAQV6e (ORCPT ); Tue, 17 Jan 2023 16:58:34 -0500 Received: from mail-ej1-x62f.google.com (mail-ej1-x62f.google.com [IPv6:2a00:1450:4864:20::62f]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 104064B1BC; Tue, 17 Jan 2023 12:39:52 -0800 (PST) Received: by mail-ej1-x62f.google.com with SMTP id mg12so5901510ejc.5; Tue, 17 Jan 2023 12:39:51 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=content-transfer-encoding:in-reply-to:references:cc:to:from :content-language:subject:user-agent:mime-version:date:message-id :from:to:cc:subject:date:message-id:reply-to; bh=Qhuunm12DEUADeX8dZ1+bPKvTYYCnKP/G5wxRkVG32M=; b=C0R6/YwzfY0T7pWfj1KfzrJMC5SROY64WVHpv9q03vsb1sWMnmpnyJDkQ0577A527Y Q5JvKbM4xbjkk5TBLmzKZ4CjUefEXu/yLdSOpk1kYGHKw0+/XNX1ZJqwtq8vGcJJjBlc X1Z+VDPZ9J8ZAl6Kpr+5M8JhAocBRGc1Kz0r741kDFmONPvYv9/fhuoyZploNhkjIDBd eyqhOE8oqXhzQjD6Jgd1521qa32Ftw6L9XqDt1N/9b0o0lWzhYSySg+Ym7wmdDo4iy2s YONXrK7yRsIcJjYXuXQj+ta8z2iWkfSY+ibhge3MTdDDnsklxzkRt0wo+XdFXBnxSSO/ yhzw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:in-reply-to:references:cc:to:from :content-language:subject:user-agent:mime-version:date:message-id :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=Qhuunm12DEUADeX8dZ1+bPKvTYYCnKP/G5wxRkVG32M=; b=KUJsCX9WhItOrWCyi4RoGaeMUlUeU97G68a/txU/ieY804ojEEWT7KnEhaBzn0VZFG 3EH/s39FlZPRHANEH2iQPTOHaDjEf4JDBVeJZpj/uwuuDeVRU7m0kVstfUI+OdMJOF33 h3v5eYiFxFEVGBipvS5307x+AKSeaBfO4ZdvIK9UNmot7X+0EJ7k+3HNCx7/CwkjAEjp c6q3Lgxy2zGrFMYGswB+F6E49klhmFkFLckw9fVczZw4VxQom+tXFbxIK47PoDTkNdhV nFEz3lxefpmX1Tcsl2Ki0XOyxMu1zMBTxeOlmS88tZlqCxc38J8ykHKEww/szAi0kF6m sZJA== X-Gm-Message-State: AFqh2kqOKPGRmSF+Zt5vWF0MOqSvN/9UU5W6/Uh/tWMMQZ9g2GXO9sSv ncqiG7vIYstVSgh/CNuPu1JwzO1SX00= X-Google-Smtp-Source: AMrXdXuVeW6YLq5/ciKW4vskN7m/dm4j3ksM0yiEaslkEmcfX81qP4Hul8QfbtJ5HXmPY4q3blbKow== X-Received: by 2002:a17:906:6b03:b0:86e:26d8:52ff with SMTP id q3-20020a1709066b0300b0086e26d852ffmr5452018ejr.2.1673987990514; Tue, 17 Jan 2023 12:39:50 -0800 (PST) Received: from ?IPV6:2a01:c22:7346:8100:11fa:3b53:e36a:9e73? 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[2a01:c22:7346:8100:11fa:3b53:e36a:9e73]) by smtp.googlemail.com with ESMTPSA id p14-20020a17090653ce00b0085ea718a81bsm8213416ejo.198.2023.01.17.12.39.49 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 17 Jan 2023 12:39:50 -0800 (PST) Message-ID: Date: Tue, 17 Jan 2023 21:39:23 +0100 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:102.0) Gecko/20100101 Thunderbird/102.6.1 Subject: [PATCH v4 3/3] i2c: gpio: support write-only sda/scl w/o pull-up Content-Language: en-US From: Heiner Kallweit To: Rob Herring , Krzysztof Kozlowski , Wolfram Sang , Peter Rosin Cc: "linux-i2c@vger.kernel.org" , "devicetree@vger.kernel.org" References: <57666b4f-4c12-7feb-caf1-5bd38908bfc7@gmail.com> In-Reply-To: <57666b4f-4c12-7feb-caf1-5bd38908bfc7@gmail.com> Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org 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. Handle the new attributes for write-only SDA and missing pull-up on SDA/SCL. For either pin the open-drain and has-no-pullup properties are mutually-exclusive, what is documented in the DT property documentation. We don't add an extra warning here because the open-drain properties are marked deprecated anyway. Signed-off-by: Heiner Kallweit --- v3: - improve description of attribute sda_is_output_only v4: - handle new no-pullup attributes --- drivers/i2c/busses/i2c-gpio.c | 13 ++++++++++--- include/linux/platform_data/i2c-gpio.h | 9 +++++++++ 2 files changed, 19 insertions(+), 3 deletions(-) diff --git a/drivers/i2c/busses/i2c-gpio.c b/drivers/i2c/busses/i2c-gpio.c index 0e4385a9b..85b3beb20 100644 --- a/drivers/i2c/busses/i2c-gpio.c +++ b/drivers/i2c/busses/i2c-gpio.c @@ -316,6 +316,12 @@ static void of_i2c_gpio_get_props(struct device_node *np, of_property_read_bool(np, "i2c-gpio,scl-open-drain"); pdata->scl_is_output_only = of_property_read_bool(np, "i2c-gpio,scl-output-only"); + pdata->sda_is_output_only = + of_property_read_bool(np, "i2c-gpio,sda-output-only"); + pdata->sda_has_no_pullup = + of_property_read_bool(np, "i2c-gpio,sda-has-no-pullup"); + pdata->scl_has_no_pullup = + of_property_read_bool(np, "i2c-gpio,scl-has-no-pullup"); } static struct gpio_desc *i2c_gpio_get_desc(struct device *dev, @@ -392,7 +398,7 @@ static int i2c_gpio_probe(struct platform_device *pdev) * handle them as we handle any other output. Else we enforce open * drain as this is required for an I2C bus. */ - if (pdata->sda_is_open_drain) + if (pdata->sda_is_open_drain || pdata->sda_has_no_pullup) gflags = GPIOD_OUT_HIGH; else gflags = GPIOD_OUT_HIGH_OPEN_DRAIN; @@ -400,7 +406,7 @@ static int i2c_gpio_probe(struct platform_device *pdev) if (IS_ERR(priv->sda)) return PTR_ERR(priv->sda); - if (pdata->scl_is_open_drain) + if (pdata->scl_is_open_drain || pdata->scl_has_no_pullup) gflags = GPIOD_OUT_HIGH; else gflags = GPIOD_OUT_HIGH_OPEN_DRAIN; @@ -418,7 +424,8 @@ static int i2c_gpio_probe(struct platform_device *pdev) if (!pdata->scl_is_output_only) bit_data->getscl = i2c_gpio_getscl; - bit_data->getsda = i2c_gpio_getsda; + if (!pdata->sda_is_output_only) + bit_data->getsda = i2c_gpio_getsda; if (pdata->udelay) bit_data->udelay = pdata->udelay; diff --git a/include/linux/platform_data/i2c-gpio.h b/include/linux/platform_data/i2c-gpio.h index a907774fd..545639bcc 100644 --- a/include/linux/platform_data/i2c-gpio.h +++ b/include/linux/platform_data/i2c-gpio.h @@ -16,16 +16,25 @@ * isn't actively driven high when setting the output value high. * gpio_get_value() must return the actual pin state even if the * pin is configured as an output. + * @sda_is_output_only: SDA output drivers can't be turned off. + * This is for clients that can only read SDA/SCL. + * @sda_has_no_pullup: SDA is used in a non-compliant way and has no pull-up. + * Therefore disable open-drain. * @scl_is_open_drain: SCL is set up as open drain. Same requirements * as for sda_is_open_drain apply. * @scl_is_output_only: SCL output drivers cannot be turned off. + * @scl_has_no_pullup: SCL is used in a non-compliant way and has no pull-up. + * Therefore disable open-drain. */ struct i2c_gpio_platform_data { int udelay; int timeout; unsigned int sda_is_open_drain:1; + unsigned int sda_is_output_only:1; + unsigned int sda_has_no_pullup:1; unsigned int scl_is_open_drain:1; unsigned int scl_is_output_only:1; + unsigned int scl_has_no_pullup:1; }; #endif /* _LINUX_I2C_GPIO_H */