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@microchip.com>
Cc: linux-kernel@vger.kernel.org
Cc: linux-mips@linux-mips.org
Cc: Joshua Henderson <digitalpeer@digitalpeer.com>
Patchwork: https://patchwork.linux-mips.org/patch/13262/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

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();
 }