D23406.diff
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	Index: head/sys/riscv/sifive/fu540_prci.c
	===================================================================
	--- head/sys/riscv/sifive/fu540_prci.c
	+++ head/sys/riscv/sifive/fu540_prci.c
	@@ -45,6 +45,7 @@
	#include <machine/cpu.h>

	#include <dev/extres/clk/clk.h>
	+#include <dev/extres/clk/clk_fixed.h>

	#include <dev/ofw/ofw_bus.h>
	#include <dev/ofw/ofw_bus_subr.h>
	@@ -119,6 +120,17 @@
	PLL(PRCI_CLK_GEMGXLPLL, "gemgxclk", PRCI_GEMGXLPLL_CFG0),
	};

	+/* Fixed divisor clock TLCLK. */
	+struct clk_fixed_def tlclk_def = {
	+ .clkdef.id = PRCI_CLK_TLCLK,
	+ .clkdef.name = "prci_tlclk",
	+ .clkdef.parent_names = (const char *[]){"coreclk"},
	+ .clkdef.parent_cnt = 1,
	+ .clkdef.flags = CLK_NODE_STATIC_STRINGS,
	+ .mult = 1,
	+ .div = 2,
	+};
	+
	static int
	prci_clk_pll_init(struct clknode *clk, device_t dev)
	{
	@@ -270,6 +282,16 @@
	clkdef.name = pll_clks[i].name;
	prci_pll_register(sc, &clkdef, pll_clks[i].reg);
	}
	+
	+ /*
	+ * Register the fixed clock "tlclk".
	+ *
	+ * If an older device tree is being used, tlclk may appear as its own
	+ * entity in the device tree, under soc/tlclk. If this is the case it
	+ * will be registered automatically by the fixed_clk driver, and the
	+ * version we register here will be an unreferenced duplicate.
	+ */
	+ clknode_fixed_register(sc->clkdom, &tlclk_def);

	error = clkdom_finit(sc->clkdom);
	if (error)