From patchwork Sun May 19 16:55:04 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: egyszeregy@freemail.hu X-Patchwork-Id: 797921 Received: from smtp-out.freemail.hu (fmfe28.freemail.hu [46.107.16.233]) (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 7713A1E867; Sun, 19 May 2024 17:02:26 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=46.107.16.233 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1716138150; cv=none; b=ic6KbYNZdATdr3afDmDC2vExXn9NKJ2gly8ZWDDaqwbQact+St2LA5PB94erMegwd/HV7+DVg2h0RNFxAxWDNZrg8ZadcFdf13BKZcZrLXbSpdCsdlqJ6HeRdOd1EfThpA+cx/Arkn+7tKNSq6ErYCkmkBSR6S+hkjrIr9fO37M= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1716138150; c=relaxed/simple; bh=z0HEpwuxgZUJe2+XFOQ3mW/AL7YeIiVbzyFq4gc3vbE=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version:Content-Type; b=ESd5Nat8pyPArAHn8omObx3VpQL6EhKZap2oi7J5SaLcPih/260EXaT+Au7fkUbYVFTwqZMH5QKj0Qkz9lwyePtlIacWtUzFBFd1vJNvNRMGmkWLWYk9oxc89awbypTezz4VcVZ5ppJp0ioxF67ylJMCkt9RJVub/Uxos/71+nw= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=freemail.hu; spf=pass smtp.mailfrom=freemail.hu; dkim=fail (2048-bit key) header.d=freemail.hu header.i=@freemail.hu header.b=PcgcU1SF reason="signature verification failed"; arc=none smtp.client-ip=46.107.16.233 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=freemail.hu Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=freemail.hu Authentication-Results: smtp.subspace.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=freemail.hu header.i=@freemail.hu header.b="PcgcU1SF" Received: from fizweb.elte.hu (fizweb.elte.hu [157.181.183.248]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by smtp.freemail.hu (Postfix) with ESMTPSA id 4Vj6JH3s6Lz4dp; Sun, 19 May 2024 18:55:11 +0200 (CEST) From: egyszeregy@freemail.hu To: wsa+renesas@sang-engineering.com, linux-i2c@vger.kernel.org, linux-kernel@vger.kernel.org Cc: =?utf-8?q?Benjamin_Sz=C5=91ke?= Subject: [PATCH] i2c-dev: Introduce "linux,i2c-dev-name" property for device tree of I2C controller. Date: Sun, 19 May 2024 18:55:04 +0200 Message-Id: <20240519165504.19627-1-egyszeregy@freemail.hu> X-Mailer: git-send-email 2.39.3 Precedence: bulk X-Mailing-List: linux-i2c@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=simple/relaxed; t=1716137712; s=20181004; d=freemail.hu; h=From:To:Cc:Subject:Date:MIME-Version:Content-Type:Content-Transfer-Encoding; l=1506; bh=SpZ0hi7sZoilYx08Os0iQ7zMl6chRN/0TUPqVc9082s=; b=PcgcU1SF4t47qJMHd47C/PTdJAf+Z0cHl4+46HozeIKSY16BYsXFtOjdPhcOQP++ uc3KwZqMX992JtvPfoC2C/HaB1OnKU2gjVQdU0Kpg0nl+QZy2lGftFVsu38ssEzPW/Q 9zX9ep+t84aa2WQJjO7l/YEHwJcTAcE4u/qnrqgiqn6TfIJDp36Qm+PJjUY8UGpKX+7 DRCW56Rf09VQj9wtuH+WQSenE01qHsneU+fpUUuJOztA/I9PIADrkrmaIsdmVbK/o39 GjMG8aRzVDDc0TG5kqRM+NDUNFv60ABOJPxrheeIegW29Nrcdx5oOx8ZZj8Ih9Wr5z5 xxV756CF9w== From: Benjamin Szőke Optionally, an I2C controller may have a "linux,i2c-dev-name" property. This is a string which is defining a custom suffix name for I2C device in /dev/i2c- format. It helps to improve software portability between various SoCs and reduce complexities of hardware related codes in SWs. Signed-off-by: Benjamin Szőke --- drivers/i2c/i2c-dev.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) diff --git a/drivers/i2c/i2c-dev.c b/drivers/i2c/i2c-dev.c index 8b7e599f1674..df4cec88ea59 100644 --- a/drivers/i2c/i2c-dev.c +++ b/drivers/i2c/i2c-dev.c @@ -651,6 +651,7 @@ static void i2cdev_dev_release(struct device *dev) static int i2cdev_attach_adapter(struct device *dev) { + const char *name; struct i2c_adapter *adap; struct i2c_dev *i2c_dev; int res; @@ -672,7 +673,16 @@ static int i2cdev_attach_adapter(struct device *dev) i2c_dev->dev.parent = &adap->dev; i2c_dev->dev.release = i2cdev_dev_release; - res = dev_set_name(&i2c_dev->dev, "i2c-%d", adap->nr); + /* + * If "linux,i2c-dev-name" is specified in device tree, use /dev/i2c- + * in Linux userspace, otherwise use /dev/i2c-. + */ + res = device_property_read_string(&adap->dev, "linux,i2c-dev-name", &name); + if (res < 0) + res = dev_set_name(&i2c_dev->dev, "i2c-%d", adap->nr); + else + res = dev_set_name(&i2c_dev->dev, "i2c-%s", name); + if (res) goto err_put_i2c_dev;