To keep in sync with Linux kernel device tree, generate hfclk and
rtcclk nodes in the device tree, to be referenced by PRCI node.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
---

Changes in v7: None
Changes in v6: None
Changes in v5: None
Changes in v4: None
Changes in v3: None
Changes in v2: None

 hw/riscv/sifive_u.c         | 23 +++++++++++++++++++++++
 include/hw/riscv/sifive_u.h |  2 ++
 2 files changed, 25 insertions(+)

diff --git a/hw/riscv/sifive_u.c b/hw/riscv/sifive_u.c
index 24ae3d1..f048806 100644
--- a/hw/riscv/sifive_u.c
+++ b/hw/riscv/sifive_u.c
@@ -79,6 +79,7 @@ static void create_fdt(SiFiveUState *s, const struct MemmapEntry *memmap,
     char ethclk_names[] = "pclk\0hclk\0tx_clk";
     uint32_t plic_phandle, ethclk_phandle, phandle = 1;
     uint32_t uartclk_phandle;
+    uint32_t hfclk_phandle, rtcclk_phandle;
 
     fdt = s->fdt = create_device_tree(&s->fdt_size);
     if (!fdt) {
@@ -97,6 +98,28 @@ static void create_fdt(SiFiveUState *s, const struct MemmapEntry *memmap,
     qemu_fdt_setprop_cell(fdt, "/soc", "#size-cells", 0x2);
     qemu_fdt_setprop_cell(fdt, "/soc", "#address-cells", 0x2);
 
+    hfclk_phandle = phandle++;
+    nodename = g_strdup_printf("/hfclk");
+    qemu_fdt_add_subnode(fdt, nodename);
+    qemu_fdt_setprop_cell(fdt, nodename, "phandle", hfclk_phandle);
+    qemu_fdt_setprop_string(fdt, nodename, "clock-output-names", "hfclk");
+    qemu_fdt_setprop_cell(fdt, nodename, "clock-frequency",
+        SIFIVE_U_HFCLK_FREQ);
+    qemu_fdt_setprop_string(fdt, nodename, "compatible", "fixed-clock");
+    qemu_fdt_setprop_cell(fdt, nodename, "#clock-cells", 0x0);
+    g_free(nodename);
+
+    rtcclk_phandle = phandle++;
+    nodename = g_strdup_printf("/rtcclk");
+    qemu_fdt_add_subnode(fdt, nodename);
+    qemu_fdt_setprop_cell(fdt, nodename, "phandle", rtcclk_phandle);
+    qemu_fdt_setprop_string(fdt, nodename, "clock-output-names", "rtcclk");
+    qemu_fdt_setprop_cell(fdt, nodename, "clock-frequency",
+        SIFIVE_U_RTCCLK_FREQ);
+    qemu_fdt_setprop_string(fdt, nodename, "compatible", "fixed-clock");
+    qemu_fdt_setprop_cell(fdt, nodename, "#clock-cells", 0x0);
+    g_free(nodename);
+
     nodename = g_strdup_printf("/memory@%lx",
         (long)memmap[SIFIVE_U_DRAM].base);
     qemu_fdt_add_subnode(fdt, nodename);
diff --git a/include/hw/riscv/sifive_u.h b/include/hw/riscv/sifive_u.h
index 7a1a4f3..debbf28 100644
--- a/include/hw/riscv/sifive_u.h
+++ b/include/hw/riscv/sifive_u.h
@@ -68,6 +68,8 @@ enum {
 
 enum {
     SIFIVE_U_CLOCK_FREQ = 1000000000,
+    SIFIVE_U_HFCLK_FREQ = 33333333,
+    SIFIVE_U_RTCCLK_FREQ = 1000000,
     SIFIVE_U_GEM_CLOCK_FREQ = 125000000
 };
 
-- 
2.7.4