linux-kernel - [PATCH 03/11] MIPS: pic32mzda: fix getting timer clock rate.

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Message-ID: <1463461560-9629-3-git-send-email-purna.mandal@microchip.com>
Date:	Tue, 17 May 2016 10:35:52 +0530
From:	Purna Chandra Mandal <purna.mandal@...rochip.com>
To:	<linux-kernel@...r.kernel.org>
CC:	<linux-mips@...ux-mips.org>, Ralf Baechle <ralf@...ux-mips.org>,
	Purna Chandra Mandal <purna.mandal@...rochip.com>,
	Joshua Henderson <digitalpeer@...italpeer.com>,
	Joshua Henderson <joshua.henderson@...rochip.com>
Subject: [PATCH 03/11] MIPS: pic32mzda: fix getting timer clock rate.

PIC32 clock driver is now implemented as platform driver instead of
as part of of_clk_init(). It meants all the clock modules are available
quite late in the boot sequence. So request for CPU clock by clk_get_sys()
and clk_get_rate() to find c0_timer rate fails.

To fix this use PIC32 specific early clock functions implemented for early
console support.

Signed-off-by: Purna Chandra Mandal <purna.mandal@...rochip.com>

---
Note: Please pull this complete series through the MIPS tree.

---

 arch/mips/pic32/pic32mzda/time.c | 13 ++++---------
 1 file changed, 4 insertions(+), 9 deletions(-)

diff --git a/arch/mips/pic32/pic32mzda/time.c b/arch/mips/pic32/pic32mzda/time.c
index ca6a62b..62a0a78 100644
--- a/arch/mips/pic32/pic32mzda/time.c
+++ b/arch/mips/pic32/pic32mzda/time.c
@@ -11,13 +11,12 @@
  *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  *  for more details.
  */
-#include <linux/clk.h>
 #include <linux/clk-provider.h>
 #include <linux/clocksource.h>
 #include <linux/init.h>
+#include <linux/irqdomain.h>
 #include <linux/of.h>
 #include <linux/of_irq.h>
-#include <linux/irqdomain.h>
 
 #include <asm/time.h>
 
@@ -58,16 +57,12 @@ unsigned int get_c0_compare_int(void)
 
 void __init plat_time_init(void)
 {
-	struct clk *clk;
+	unsigned long rate = pic32_get_pbclk(7);
 
 	of_clk_init(NULL);
-	clk = clk_get_sys("cpu_clk", NULL);
-	if (IS_ERR(clk))
-		panic("unable to get CPU clock, err=%ld", PTR_ERR(clk));
 
-	clk_prepare_enable(clk);
-	pr_info("CPU Clock: %ldMHz\n", clk_get_rate(clk) / 1000000);
-	mips_hpt_frequency = clk_get_rate(clk) / 2;
+	pr_info("CPU Clock: %ldMHz\n", rate / 1000000);
+	mips_hpt_frequency = rate / 2;
 
 	clocksource_probe();
 }
-- 
1.8.3.1