From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932290AbdBVKgz (ORCPT ); Wed, 22 Feb 2017 05:36:55 -0500 Received: from us01smtprelay-2.synopsys.com ([198.182.60.111]:58198 "EHLO smtprelay.synopsys.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932117AbdBVKgt (ORCPT ); Wed, 22 Feb 2017 05:36:49 -0500 From: Vlad Zakharov To: linux-snps-arc@lists.infradead.org Cc: Vineet Gupta , Alexey Brodkin , linux-kernel@vger.kernel.org, Vlad Zakharov Subject: [PATCH] arc: get rate from clk driver instead of reading device tree Date: Wed, 22 Feb 2017 13:36:36 +0300 Message-Id: <1487759796-14418-1-git-send-email-vzakhar@synopsys.com> X-Mailer: git-send-email 2.7.4 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org We were reading clock rate directly from device tree "clock-frequency" property of corresponding clock node in show_cpuinfo function. Such approach is correct only in case cpu is always clocked by "fixed-clock". If we use clock driver that allows rate to be changed this won't work as rate may change during the time or even "clock-frequency" property may not be presented at all. So this commit replaces reading device tree with getting rate from clock driver. This approach is much more flexible and will work for both fixed and mutable clocks. Signed-off-by: Vlad Zakharov --- arch/arc/kernel/setup.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/arch/arc/kernel/setup.c b/arch/arc/kernel/setup.c index 3093fa8..49b0804 100644 --- a/arch/arc/kernel/setup.c +++ b/arch/arc/kernel/setup.c @@ -10,6 +10,7 @@ #include #include #include +#include #include #include #include @@ -488,7 +489,8 @@ static int show_cpuinfo(struct seq_file *m, void *v) { char *str; int cpu_id = ptr_to_cpu(v); - struct device_node *core_clk = of_find_node_by_name(NULL, "core_clk"); + struct device *cpu_dev = get_cpu_device(cpu_id); + struct clk *cpu_clk = clk_get(cpu_dev, "core_clk"); u32 freq = 0; if (!cpu_online(cpu_id)) { @@ -502,7 +504,7 @@ static int show_cpuinfo(struct seq_file *m, void *v) seq_printf(m, arc_cpu_mumbojumbo(cpu_id, str, PAGE_SIZE)); - of_property_read_u32(core_clk, "clock-frequency", &freq); + freq = clk_get_rate(cpu_clk); if (freq) seq_printf(m, "CPU speed\t: %u.%02u Mhz\n", freq / 1000000, (freq / 10000) % 100); -- 2.7.4