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authorMax Filippov <jcmvbkbc@gmail.com>2016-07-25 10:58:10 +0300
committerMax Filippov <jcmvbkbc@gmail.com>2016-09-21 04:52:51 +0300
commit58c3e3ac7a1daf56523567507a096a3e4026596d (patch)
tree73eed62674328b843a30af63c96d6281e28090fc
parentbebbc4bcf36f015a5a051cc8817b11de209fbe8b (diff)
downloadlinux-58c3e3ac7a1daf56523567507a096a3e4026596d.tar.xz
xtensa: xtfpga: use clock provider, don't update DT
Instead of querying hardcoded FPGA frequency register and then updating clock-frequency property in specificly named DT nodes in machine setup code register a clock provider that returns fixed-rate clock, configured by register specified in DT. This way we have less magic/hardcoded names and use more existing common clock framework code. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com> Tested-by: Guenter Roeck <linux@roeck-us.net>
-rw-r--r--arch/xtensa/boot/dts/xtfpga.dtsi11
-rw-r--r--arch/xtensa/platforms/xtfpga/setup.c33
2 files changed, 35 insertions, 9 deletions
diff --git a/arch/xtensa/boot/dts/xtfpga.dtsi b/arch/xtensa/boot/dts/xtfpga.dtsi
index cd45f9c2c448..ded56984dd23 100644
--- a/arch/xtensa/boot/dts/xtfpga.dtsi
+++ b/arch/xtensa/boot/dts/xtfpga.dtsi
@@ -36,11 +36,6 @@
};
clocks {
- osc: main-oscillator {
- #clock-cells = <0>;
- compatible = "fixed-clock";
- };
-
clk54: clk54 {
#clock-cells = <0>;
compatible = "fixed-clock";
@@ -54,6 +49,12 @@
compatible = "simple-bus";
ranges = <0x00000000 0xf0000000 0x10000000>;
+ osc: main-oscillator {
+ #clock-cells = <0>;
+ compatible = "cdns,xtfpga-clock";
+ reg = <0x0d020004 0x4>;
+ };
+
serial0: serial@0d050020 {
device_type = "serial";
compatible = "ns16550a";
diff --git a/arch/xtensa/platforms/xtfpga/setup.c b/arch/xtensa/platforms/xtfpga/setup.c
index f0b753f335d8..99a38a6febea 100644
--- a/arch/xtensa/platforms/xtfpga/setup.c
+++ b/arch/xtensa/platforms/xtfpga/setup.c
@@ -26,6 +26,8 @@
#include <linux/console.h>
#include <linux/delay.h>
#include <linux/of.h>
+#include <linux/clk-provider.h>
+#include <linux/of_address.h>
#include <asm/timex.h>
#include <asm/processor.h>
@@ -87,6 +89,33 @@ static void __init update_clock_frequency(struct device_node *node)
of_update_property(node, newfreq);
}
+static void __init xtfpga_clk_setup(struct device_node *np)
+{
+ void __iomem *base = of_iomap(np, 0);
+ struct clk *clk;
+ u32 freq;
+
+ if (!base) {
+ pr_err("%s: invalid address\n", np->name);
+ return;
+ }
+
+ freq = __raw_readl(base);
+ iounmap(base);
+ clk = clk_register_fixed_rate(NULL, np->name, NULL, 0, freq);
+
+ if (IS_ERR(clk)) {
+ pr_err("%s: clk registration failed\n", np->name);
+ return;
+ }
+
+ if (of_clk_add_provider(np, of_clk_src_simple_get, clk)) {
+ pr_err("%s: clk provider registration failed\n", np->name);
+ return;
+ }
+}
+CLK_OF_DECLARE(xtfpga_clk, "cdns,xtfpga-clock", xtfpga_clk_setup);
+
#define MAC_LEN 6
static void __init update_local_mac(struct device_node *node)
{
@@ -117,12 +146,8 @@ static void __init update_local_mac(struct device_node *node)
static int __init machine_setup(void)
{
- struct device_node *clock;
struct device_node *eth = NULL;
- for_each_node_by_name(clock, "main-oscillator")
- update_clock_frequency(clock);
-
if ((eth = of_find_compatible_node(eth, NULL, "opencores,ethoc")))
update_local_mac(eth);
return 0;