From patchwork Fri Sep 9 19:36:04 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Serge Semin X-Patchwork-Id: 604310 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 68A53C6FA89 for ; Fri, 9 Sep 2022 19:37:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230436AbiIIThF (ORCPT ); Fri, 9 Sep 2022 15:37:05 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37608 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230268AbiIITgu (ORCPT ); Fri, 9 Sep 2022 15:36:50 -0400 Received: from mail.baikalelectronics.com (mail.baikalelectronics.com [87.245.175.230]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id D789D115CE3; Fri, 9 Sep 2022 12:36:37 -0700 (PDT) Received: from mail (mail.baikal.int [192.168.51.25]) by mail.baikalelectronics.com (Postfix) with ESMTP id 27E3FDBF; Fri, 9 Sep 2022 22:40:22 +0300 (MSK) DKIM-Filter: OpenDKIM Filter v2.11.0 mail.baikalelectronics.com 27E3FDBF DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=baikalelectronics.ru; s=mail; t=1662752422; bh=4UEvOJBnrhYbJMOH5dIhZYkkbJ2g80CrYqwa/ZKcSYU=; h=From:To:CC:Subject:Date:In-Reply-To:References:From; b=PuI+Re6LN1febwr8DWRC0N7Vh/Z6Olj+NKDllbtqHnTPgdUnqdjDaIBA608in6QIS +6lx0LYqvn+sdfBUgmoYj2NSYvq9x0w4g6bTXl6ogVkgNqenHF4WdHU0ftgjvlrxCM p0yOA7DYXbv+cA4gEgl1urShyqqMTVUjK3JcpcK8= Received: from localhost (192.168.168.10) by mail (192.168.51.25) with Microsoft SMTP Server (TLS) id 15.0.1395.4; Fri, 9 Sep 2022 22:36:33 +0300 From: Serge Semin To: Damien Le Moal , Hans de Goede , Jens Axboe , Hannes Reinecke CC: Serge Semin , Serge Semin , Alexey Malahov , Pavel Parkhomenko , Rob Herring , Krzysztof Kozlowski , , , Subject: [PATCH v8 06/23] ata: libahci_platform: Convert to using platform devm-ioremap methods Date: Fri, 9 Sep 2022 22:36:04 +0300 Message-ID: <20220909193621.17380-7-Sergey.Semin@baikalelectronics.ru> In-Reply-To: <20220909193621.17380-1-Sergey.Semin@baikalelectronics.ru> References: <20220909193621.17380-1-Sergey.Semin@baikalelectronics.ru> MIME-Version: 1.0 X-ClientProxiedBy: MAIL.baikal.int (192.168.51.25) To mail (192.168.51.25) Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org Currently the IOMEM AHCI registers space is mapped by means of the two functions invocation: platform_get_resource() is used to get the very first memory resource and devm_ioremap_resource() is called to remap that resource. Device-managed kernel API provides a handy wrapper to perform the same in single function call: devm_platform_ioremap_resource(). While at it seeing many AHCI platform drivers rely on having the AHCI CSR space marked with "ahci" name let's first try to find and remap the CSR IO-mem with that name and only if it fails fallback to getting the very first registers space platform resource. Signed-off-by: Serge Semin Reviewed-by: Hannes Reinecke --- Changelog v2: - Check whether there is "ahci" reg resource before using the devm_platform_ioremap_resource_byname() method in order to prevent a false error message printed in the log (@Damien) - Slightly update the patch title due to the change above and to be more specific about what the platform device managed methods are utilized for. --- drivers/ata/libahci_platform.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/drivers/ata/libahci_platform.c b/drivers/ata/libahci_platform.c index 32495ae96567..1e9e825d6cc5 100644 --- a/drivers/ata/libahci_platform.c +++ b/drivers/ata/libahci_platform.c @@ -402,8 +402,14 @@ struct ahci_host_priv *ahci_platform_get_resources(struct platform_device *pdev, devres_add(dev, hpriv); - hpriv->mmio = devm_ioremap_resource(dev, - platform_get_resource(pdev, IORESOURCE_MEM, 0)); + /* + * If the DT provided an "ahci" named resource, use it. Otherwise, + * fallback to using the default first resource for the device node. + */ + if (platform_get_resource_byname(pdev, IORESOURCE_MEM, "ahci")) + hpriv->mmio = devm_platform_ioremap_resource_byname(pdev, "ahci"); + else + hpriv->mmio = devm_platform_ioremap_resource(pdev, 0); if (IS_ERR(hpriv->mmio)) { rc = PTR_ERR(hpriv->mmio); goto err_out;