From patchwork Tue Mar 19 17:53:10 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Nishanth Menon X-Patchwork-Id: 2303521 Return-Path: X-Original-To: patchwork-linux-pm@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 BC7E1DFB79 for ; Tue, 19 Mar 2013 17:53:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933266Ab3CSRx3 (ORCPT ); Tue, 19 Mar 2013 13:53:29 -0400 Received: from devils.ext.ti.com ([198.47.26.153]:35971 "EHLO devils.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933119Ab3CSRx3 (ORCPT ); Tue, 19 Mar 2013 13:53:29 -0400 Received: from dlelxv30.itg.ti.com ([172.17.2.17]) by devils.ext.ti.com (8.13.7/8.13.7) with ESMTP id r2JHrEEh026254; Tue, 19 Mar 2013 12:53:14 -0500 Received: from DLEE71.ent.ti.com (dlee71.ent.ti.com [157.170.170.114]) by dlelxv30.itg.ti.com (8.13.8/8.13.8) with ESMTP id r2JHrE7O000398; Tue, 19 Mar 2013 12:53:14 -0500 Received: from dlelxv22.itg.ti.com (172.17.1.197) by DLEE71.ent.ti.com (157.170.170.114) with Microsoft SMTP Server id 14.2.342.3; Tue, 19 Mar 2013 12:53:14 -0500 Received: from localhost (kahuna.am.dhcp.ti.com [128.247.75.12]) by dlelxv22.itg.ti.com (8.13.8/8.13.8) with ESMTP id r2JHrEXl017677; Tue, 19 Mar 2013 12:53:14 -0500 From: Nishanth Menon To: CC: Nishanth Menon , Kevin Hilman , Jon Hunter , =?UTF-8?q?Beno=C3=AEt=20Cousson?= , Santosh Shilimkar , Shawn Guo , Keerthy , , , , Subject: [PATCH V2 8/8] cpufreq: OMAP: donot allow to be used with device tree Date: Tue, 19 Mar 2013 12:53:10 -0500 Message-ID: <1363715590-5131-9-git-send-email-nm@ti.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1363715590-5131-1-git-send-email-nm@ti.com> References: <1363715590-5131-1-git-send-email-nm@ti.com> MIME-Version: 1.0 Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org We now use Soc generic cpufreq-cpu0 driver using DT entries. However to allow cpufreq-cpu0 and omap-cpufreq drivers to co-exist, we need to ensure the following using the same image: 1. With device tree boot, we use cpufreq-cpu0 2. With non device tree boot, we use omap-cpufreq In the case of (1), we will have cpu OPPs and regulator registered as part of the DT, to ensure that omap-cpufreq and cpufreq-cpu0 don't conflict in managing the frequency of the same cpu, we should not permit init to pass in omap-cpufreq. In the case of (2), we will not have the cpufreq-cpu0 device, hence only omap-cpufreq will be active. So, to acommodate both these usage conditions, we fail init of omap-cpufreq when we boot with device tree. Cc: Kevin Hilman Cc: Jon Hunter Cc: "Benoît Cousson" Cc: Santosh Shilimkar Cc: Shawn Guo Cc: Keerthy Cc: linux-omap@vger.kernel.org Cc: devicetree-discuss@lists.ozlabs.org Cc: linux-arm-kernel@lists.infradead.org Cc: cpufreq@vger.kernel.org Cc: linux-pm@vger.kernel.org Signed-off-by: Nishanth Menon Acked-by: Santosh Shilimkar --- Changes in V2: - donot remove support for omap-cpufreq in non-DT boot - little more verbose commit log V1: https://patchwork.kernel.org/patch/2273641/ drivers/cpufreq/omap-cpufreq.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/drivers/cpufreq/omap-cpufreq.c b/drivers/cpufreq/omap-cpufreq.c index 9128c07..9382ed0 100644 --- a/drivers/cpufreq/omap-cpufreq.c +++ b/drivers/cpufreq/omap-cpufreq.c @@ -22,6 +22,7 @@ #include #include #include +#include #include #include #include @@ -174,6 +175,19 @@ static inline void freq_table_free(void) static int __cpuinit omap_cpu_init(struct cpufreq_policy *policy) { int result = 0; + struct device_node *np; + + /* + * If we have a device tree node describing OPPs, + * we will NOT permit usage of omap-cpufreq driver. + * use cpufreq-cpu0 driver to manage. + */ + if (of_have_populated_dt()) { + for_each_child_of_node(of_find_node_by_path("/cpus"), np) { + if (of_get_property(np, "operating-points", NULL)) + return -EPERM; + } + } mpu_clk = clk_get(NULL, "cpufreq_ck"); if (IS_ERR(mpu_clk))