riscv: sifive_u: Remove handcrafted clock nodes for UART and ethernet

In the past we did not have a model for PRCI, hence two handcrafted
clock nodes ("/soc/ethclk" and "/soc/uartclk") were created for the
purpose of supplying hard-coded clock frequencies. But now since we
have added the PRCI support in QEMU, we don't need them any more.

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

hw/riscv/sifive_u.c

@@ -87,8 +87,7 @@ static void create_fdt(SiFiveUState *s, const struct MemmapEntry *memmap,
     uint32_t *cells;
     char *nodename;
     char ethclk_names[] = "pclk\0hclk";
-    uint32_t plic_phandle, prci_phandle, ethclk_phandle, phandle = 1;
-    uint32_t uartclk_phandle;
+    uint32_t plic_phandle, prci_phandle, phandle = 1;
     uint32_t hfclk_phandle, rtcclk_phandle, phy_phandle;
 
     fdt = s->fdt = create_device_tree(&s->fdt_size);
@@ -248,17 +247,6 @@ static void create_fdt(SiFiveUState *s, const struct MemmapEntry *memmap,
     g_free(cells);
     g_free(nodename);
 
-    ethclk_phandle = phandle++;
-    nodename = g_strdup_printf("/soc/ethclk");
-    qemu_fdt_add_subnode(fdt, nodename);
-    qemu_fdt_setprop_string(fdt, nodename, "compatible", "fixed-clock");
-    qemu_fdt_setprop_cell(fdt, nodename, "#clock-cells", 0x0);
-    qemu_fdt_setprop_cell(fdt, nodename, "clock-frequency",
-        SIFIVE_U_GEM_CLOCK_FREQ);
-    qemu_fdt_setprop_cell(fdt, nodename, "phandle", ethclk_phandle);
-    ethclk_phandle = qemu_fdt_get_phandle(fdt, nodename);
-    g_free(nodename);
-
     phy_phandle = phandle++;
     nodename = g_strdup_printf("/soc/ethernet@%lx",
         (long)memmap[SIFIVE_U_GEM].base);
@@ -292,16 +280,6 @@ static void create_fdt(SiFiveUState *s, const struct MemmapEntry *memmap,
     qemu_fdt_setprop_cell(fdt, nodename, "reg", 0x0);
     g_free(nodename);
 
-    uartclk_phandle = phandle++;
-    nodename = g_strdup_printf("/soc/uartclk");
-    qemu_fdt_add_subnode(fdt, nodename);
-    qemu_fdt_setprop_string(fdt, nodename, "compatible", "fixed-clock");
-    qemu_fdt_setprop_cell(fdt, nodename, "#clock-cells", 0x0);
-    qemu_fdt_setprop_cell(fdt, nodename, "clock-frequency", 3686400);
-    qemu_fdt_setprop_cell(fdt, nodename, "phandle", uartclk_phandle);
-    uartclk_phandle = qemu_fdt_get_phandle(fdt, nodename);
-    g_free(nodename);
-
     nodename = g_strdup_printf("/soc/serial@%lx",
         (long)memmap[SIFIVE_U_UART0].base);
     qemu_fdt_add_subnode(fdt, nodename);

include/hw/riscv/sifive_u.h

@@ -77,8 +77,7 @@ enum {
 enum {
     SIFIVE_U_CLOCK_FREQ = 1000000000,
     SIFIVE_U_HFCLK_FREQ = 33333333,
-    SIFIVE_U_RTCCLK_FREQ = 1000000,
-    SIFIVE_U_GEM_CLOCK_FREQ = 125000000
+    SIFIVE_U_RTCCLK_FREQ = 1000000
 };
 
 #define SIFIVE_U_MANAGEMENT_CPU_COUNT   1