From patchwork Tue Jan 26 07:28:34 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tony Lindgren X-Patchwork-Id: 370977 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id DBE0EC433DB for ; Tue, 26 Jan 2021 18:38:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9E96622472 for ; Tue, 26 Jan 2021 18:38:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2391479AbhAZRWb (ORCPT ); Tue, 26 Jan 2021 12:22:31 -0500 Received: from muru.com ([72.249.23.125]:52926 "EHLO muru.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2387454AbhAZHkb (ORCPT ); Tue, 26 Jan 2021 02:40:31 -0500 Received: from hillo.muru.com (localhost [127.0.0.1]) by muru.com (Postfix) with ESMTP id C8E28820C; Tue, 26 Jan 2021 07:28:45 +0000 (UTC) From: Tony Lindgren To: linux-omap@vger.kernel.org Cc: Dave Gerlach , Faiz Abbas , Greg Kroah-Hartman , Grygorii Strashko , Keerthy , Nishanth Menon , Suman Anna , linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: [PATCH 2/3] bus: ti-sysc: Probe for l4_wkup and l4_cfg interconnect devices first Date: Tue, 26 Jan 2021 09:28:34 +0200 Message-Id: <20210126072835.26551-3-tony@atomide.com> X-Mailer: git-send-email 2.30.0 In-Reply-To: <20210126072835.26551-1-tony@atomide.com> References: <20210126072835.26551-1-tony@atomide.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-omap@vger.kernel.org We want to probe l4_wkup and l4_cfg interconnect devices first to avoid issues with missing resources. Otherwise we attempt to probe l4_per devices first causing pointless deferred probe and also annoyingh renumbering of the MMC devices for example. Signed-off-by: Tony Lindgren --- drivers/bus/ti-sysc.c | 49 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 49 insertions(+) diff --git a/drivers/bus/ti-sysc.c b/drivers/bus/ti-sysc.c --- a/drivers/bus/ti-sysc.c +++ b/drivers/bus/ti-sysc.c @@ -635,6 +635,51 @@ static int sysc_parse_and_check_child_range(struct sysc *ddata) return 0; } +/* Interconnect instances to probe before l4_per instances */ +static struct resource early_bus_ranges[] = { + /* am3/4 l4_wkup */ + { .start = 0x44c00000, .end = 0x44c00000 + 0x300000, }, + /* omap4/5 and dra7 l4_cfg */ + { .start = 0x4a000000, .end = 0x4a000000 + 0x300000, }, + /* omap4 l4_wkup */ + { .start = 0x4a300000, .end = 0x4a300000 + 0x30000, }, + /* omap5 and dra7 l4_wkup without dra7 dcan segment */ + { .start = 0x4ae00000, .end = 0x4ae00000 + 0x30000, }, +}; + +static atomic_t sysc_defer = ATOMIC_INIT(10); + +/** + * sysc_defer_non_critical - defer non_critical interconnect probing + * @ddata: device driver data + * + * We want to probe l4_cfg and l4_wkup interconnect instances before any + * l4_per instances as l4_per instances depend on resources on l4_cfg and + * l4_wkup interconnects. + */ +static int sysc_defer_non_critical(struct sysc *ddata) +{ + struct resource *res; + int i; + + if (!atomic_read(&sysc_defer)) + return 0; + + for (i = 0; i < ARRAY_SIZE(early_bus_ranges); i++) { + res = &early_bus_ranges[i]; + if (ddata->module_pa >= res->start && + ddata->module_pa <= res->end) { + atomic_set(&sysc_defer, 0); + + return 0; + } + } + + atomic_dec_if_positive(&sysc_defer); + + return -EPROBE_DEFER; +} + static struct device_node *stdout_path; static void sysc_init_stdout_path(struct sysc *ddata) @@ -860,6 +905,10 @@ static int sysc_map_and_check_registers(struct sysc *ddata) if (error) return error; + error = sysc_defer_non_critical(ddata); + if (error) + return error; + sysc_check_children(ddata); if (!of_get_property(np, "reg", NULL))