From patchwork Tue Nov 6 08:12:20 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mugunthan V N X-Patchwork-Id: 1703401 Return-Path: X-Original-To: patchwork-linux-omap@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork2.kernel.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by patchwork2.kernel.org (Postfix) with ESMTP id 0346ADF2A2 for ; Tue, 6 Nov 2012 08:13:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754299Ab2KFIMr (ORCPT ); Tue, 6 Nov 2012 03:12:47 -0500 Received: from comal.ext.ti.com ([198.47.26.152]:35136 "EHLO comal.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754002Ab2KFIMq (ORCPT ); Tue, 6 Nov 2012 03:12:46 -0500 Received: from dbdp20.itg.ti.com ([172.24.170.38]) by comal.ext.ti.com (8.13.7/8.13.7) with ESMTP id qA68Cb1g002362; Tue, 6 Nov 2012 02:12:38 -0600 Received: from DBDE70.ent.ti.com (localhost [127.0.0.1]) by dbdp20.itg.ti.com (8.13.8/8.13.8) with ESMTP id qA68Cab0018121; Tue, 6 Nov 2012 13:42:36 +0530 (IST) Received: from dbdp32.itg.ti.com (172.24.170.251) by dbde70.ent.ti.com (172.24.170.148) with Microsoft SMTP Server id 14.1.323.3; Tue, 6 Nov 2012 13:42:35 +0530 Received: from localhost.localdomain (dbdp20.itg.ti.com [172.24.170.38]) by dbdp32.itg.ti.com (8.13.8/8.13.8) with ESMTP id qA68CW41010680; Tue, 6 Nov 2012 13:42:35 +0530 From: Mugunthan V N To: CC: , , , , Vaibhav Hiremath , Mugunthan V N , Richard Cochran Subject: [PATCH 2/7] net: cpsw: Add parent<->child relation support between cpsw and mdio Date: Tue, 6 Nov 2012 13:42:20 +0530 Message-ID: <1352189545-26303-3-git-send-email-mugunthanvnm@ti.com> X-Mailer: git-send-email 1.7.0.4 In-Reply-To: <1352189545-26303-1-git-send-email-mugunthanvnm@ti.com> References: <1352189545-26303-1-git-send-email-mugunthanvnm@ti.com> MIME-Version: 1.0 Sender: linux-omap-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-omap@vger.kernel.org From: Vaibhav Hiremath CPGMAC SubSystem consist of various sub-modules, like, mdio, cpdma, cpsw, etc... These sub-modules are also used in some of Davinci family of devices. Now based on requirement, use-case and available technology nodes the integration of these sub-modules varies across devices. So coming back to Linux net driver, currently separate and independent platform devices & drivers for CPSW and MDIO is implemented. In case of Davinci they both has separate control, from resources perspective, like clock. In case of AM33XX, the resources are shared and only one register bit-field is provided to control module/clock enable/disable, makes it difficult to handle common resource. So the solution here implemented in this patch is, Create parent<->child relationship between both the drivers, making CPSW as a parent and MDIO as its child and enumerate all the child nodes under CPSW module. Both the drivers will function exactly the way it was operating before, including runtime-pm functionality. No change is required in MDIO driver (for that matter to any child driver). As this is only supported during DT boot, the parent<->child relationship is created and populated in DT execution flow. The only required change is inside DTS file, making MDIO as a child to CPSW node. Signed-off-by: Vaibhav Hiremath Cc: Mugunthan V N Cc: Richard Cochran --- drivers/net/ethernet/ti/cpsw.c | 16 ++++++++++++++-- 1 files changed, 14 insertions(+), 2 deletions(-) diff --git a/drivers/net/ethernet/ti/cpsw.c b/drivers/net/ethernet/ti/cpsw.c index 7654a62..7007aba 100644 --- a/drivers/net/ethernet/ti/cpsw.c +++ b/drivers/net/ethernet/ti/cpsw.c @@ -1144,7 +1144,7 @@ static int cpsw_probe_dt(struct cpsw_platform_data *data, } data->mac_control = prop; - for_each_child_of_node(node, slave_node) { + for_each_node_by_name(slave_node, "slave") { struct cpsw_slave_data *slave_data = data->slave_data + i; const char *phy_id = NULL; const void *mac_addr = NULL; @@ -1179,6 +1179,14 @@ static int cpsw_probe_dt(struct cpsw_platform_data *data, i++; } + /* + * Populate all the child nodes here... + */ + ret = of_platform_populate(node, NULL, NULL, &pdev->dev); + /* We do not want to force this, as in some cases may not have child */ + if (ret) + pr_warn("Doesn't have any child node\n"); + return 0; error_ret: @@ -1212,6 +1220,11 @@ static int __devinit cpsw_probe(struct platform_device *pdev) priv->msg_enable = netif_msg_init(debug_level, CPSW_DEBUG); priv->rx_packet_max = max(rx_packet_max, 128); + /* + * This may be required here for child devices. + */ + pm_runtime_enable(&pdev->dev); + if (cpsw_probe_dt(&priv->data, pdev)) { pr_err("cpsw: platform data missing\n"); ret = -ENODEV; @@ -1238,7 +1251,6 @@ static int __devinit cpsw_probe(struct platform_device *pdev) for (i = 0; i < data->slaves; i++) priv->slaves[i].slave_num = i; - pm_runtime_enable(&pdev->dev); priv->clk = clk_get(&pdev->dev, "fck"); if (IS_ERR(priv->clk)) { dev_err(&pdev->dev, "fck is not found\n");