microblaze: Add support for CCF

Add support for CCF for Microblaze.

Old binding:
system_timer: system-timer@41c00000 {
	clock-frequency = <75000000>;
	...
}

New binding:
system_timer: system-timer@41c00000 {
	clocks = <&clk_bus>;
	...
}

Both should be supported for a while

Microblaze clock binding:
clocks {
	#address-cells = <1>;
	#size-cells = <0>;
	clk_bus: bus {
		#clock-cells = <0>;
		clock-frequency = <75000000>;
		clock-output-names = "bus";
		compatible = "fixed-clock";
		reg = <1>;
	} ;
	clk_cpu: cpu {
		#clock-cells = <0>;
		clock-frequency = <75000000>;
		clock-output-names = "cpu";
		compatible = "fixed-clock";
		reg = <0>;
	} ;
} ;

Signed-off-by: Michal Simek <michal.simek@xilinx.com>

3 files changed, 21 insertions, 7 deletions

diff --git a/arch/microblaze/kernel/cpu/cpuinfo-pvr-full.c b/arch/microblaze/kernel/cpu/cpuinfo-pvr-full.c
index ee4689415410..93c26cf50de5 100644
--- a/arch/microblaze/kernel/cpu/cpuinfo-pvr-full.c
+++ b/arch/microblaze/kernel/cpu/cpuinfo-pvr-full.c
@@ -112,7 +112,4 @@ void set_cpuinfo_pvr_full(struct cpuinfo *ci, struct device_node *cpu)
         CI(num_wr_brk, NUMBER_OF_WR_ADDR_BRK);
 
         CI(fpga_family_code, TARGET_FAMILY);
-
-        /* take timebase-frequency from DTS */
-        ci->cpu_clock_freq = fcpu(cpu, "timebase-frequency");
 }
diff --git a/arch/microblaze/kernel/cpu/cpuinfo-static.c b/arch/microblaze/kernel/cpu/cpuinfo-static.c
index 592bb2e838c4..4854285b26e7 100644
--- a/arch/microblaze/kernel/cpu/cpuinfo-static.c
+++ b/arch/microblaze/kernel/cpu/cpuinfo-static.c
@@ -113,8 +113,6 @@ void __init set_cpuinfo_static(struct cpuinfo *ci, struct device_node *cpu)
         ci->num_rd_brk = fcpu(cpu, "xlnx,number-of-rd-addr-brk");
         ci->num_wr_brk = fcpu(cpu, "xlnx,number-of-wr-addr-brk");
 
-        ci->cpu_clock_freq = fcpu(cpu, "timebase-frequency");
-
         ci->pvr_user1 = fcpu(cpu, "xlnx,pvr-user1");
         ci->pvr_user2 = fcpu(cpu, "xlnx,pvr-user2");
 
diff --git a/arch/microblaze/kernel/cpu/cpuinfo.c b/arch/microblaze/kernel/cpu/cpuinfo.c
index c9203b1007aa..ce1cfed731ea 100644
--- a/arch/microblaze/kernel/cpu/cpuinfo.c
+++ b/arch/microblaze/kernel/cpu/cpuinfo.c
@@ -8,6 +8,7 @@
  * for more details.
  */
 
+#include <linux/clk.h>
 #include <linux/init.h>
 #include <asm/cpuinfo.h>
 #include <asm/pvr.h>
@@ -68,11 +69,10 @@ const struct family_string_key family_string_lookup[] = {
 };
 
 struct cpuinfo cpuinfo;
+static struct device_node *cpu;
 
 void __init setup_cpuinfo(void)
 {
-        struct device_node *cpu = NULL;
-
         cpu = (struct device_node *) of_find_node_by_type(NULL, "cpu");
         if (!cpu)
                 pr_err("You don't have cpu!!!\n");
@@ -102,3 +102,22 @@ void __init setup_cpuinfo(void)
                 pr_warn("%s: Stream instructions enabled"
                         " - USERSPACE CAN LOCK THIS KERNEL!\n", __func__);
 }
+
+void __init setup_cpuinfo_clk(void)
+{
+        struct clk *clk;
+
+        clk = of_clk_get(cpu, 0);
+        if (IS_ERR(clk)) {
+                pr_err("ERROR: CPU CCF input clock not found\n");
+                /* take timebase-frequency from DTS */
+                cpuinfo.cpu_clock_freq = fcpu(cpu, "timebase-frequency");
+        } else {
+                cpuinfo.cpu_clock_freq = clk_get_rate(clk);
+        }
+
+        if (!cpuinfo.cpu_clock_freq) {
+                pr_err("ERROR: CPU clock frequency not setup\n");
+                BUG();
+        }
+}