git: def7999c2ccd - main - riscv: enable cpufreq_dt driver

The branch main has been updated by mhorne:

URL: https://cgit.FreeBSD.org/src/commit/?id=def7999c2ccddc9a303a65c0bea22976e79d8613

commit def7999c2ccddc9a303a65c0bea22976e79d8613
Author:     Mitchell Horne <mhorne@FreeBSD.org>
AuthorDate: 2024-10-08 18:49:11 +0000
Commit:     Mitchell Horne <mhorne@FreeBSD.org>
CommitDate: 2025-01-10 19:16:06 +0000

    riscv: enable cpufreq_dt driver
    
    Implement the small amount of MD code required; copied from arm/arm64.
    
    One tweak is made to cpufreq_dt itself: if the opp-shared property is
    missing, but there is only one CPU, then we can still attach. This is
    relevant for the single-core Allwinner D1.
    
    Sponsored by:   The FreeBSD Foundation
    Differential Revision:  https://reviews.freebsd.org/D48124
---
 sys/conf/files.riscv         |  1 +
 sys/dev/cpufreq/cpufreq_dt.c |  2 +-
 sys/riscv/conf/GENERIC       |  3 +++
 sys/riscv/include/pcpu.h     |  3 ++-
 sys/riscv/riscv/machdep.c    | 12 +++++++++++-
 5 files changed, 18 insertions(+), 3 deletions(-)

diff --git a/sys/conf/files.riscv b/sys/conf/files.riscv
index 514c955181c3..36eea03f29a1 100644
--- a/sys/conf/files.riscv
+++ b/sys/conf/files.riscv
@@ -4,6 +4,7 @@ cddl/dev/dtrace/riscv/dtrace_subr.c			optional dtrace compile-with "${DTRACE_C}"
 cddl/dev/dtrace/riscv/instr_size.c			optional dtrace compile-with "${DTRACE_C}"
 cddl/dev/fbt/riscv/fbt_isa.c				optional dtrace_fbt | dtraceall compile-with "${FBT_C}"
 crypto/des/des_enc.c		optional	netsmb
+dev/cpufreq/cpufreq_dt.c	optional	cpufreq fdt
 dev/ofw/ofw_cpu.c		optional	fdt
 dev/ofw/ofw_pcib.c		optional 	pci fdt
 dev/pci/pci_dw.c		optional	pci fdt
diff --git a/sys/dev/cpufreq/cpufreq_dt.c b/sys/dev/cpufreq/cpufreq_dt.c
index 929eebfe7dc5..e35a8ec73ef4 100644
--- a/sys/dev/cpufreq/cpufreq_dt.c
+++ b/sys/dev/cpufreq/cpufreq_dt.c
@@ -401,7 +401,7 @@ cpufreq_dt_oppv2_parse(struct cpufreq_dt_softc *sc, phandle_t node)
 	if (opp_table == opp_xref)
 		return (ENXIO);
 
-	if (!OF_hasprop(opp_table, "opp-shared")) {
+	if (!OF_hasprop(opp_table, "opp-shared") && mp_ncpus > 1) {
 		device_printf(sc->dev, "Only opp-shared is supported\n");
 		return (ENXIO);
 	}
diff --git a/sys/riscv/conf/GENERIC b/sys/riscv/conf/GENERIC
index 23d8a4e47eee..34426f167963 100644
--- a/sys/riscv/conf/GENERIC
+++ b/sys/riscv/conf/GENERIC
@@ -90,6 +90,9 @@ device		syscon
 device		syscon_power
 device		riscv_syscon
 
+# CPU frequency control
+device		cpufreq
+
 # Bus drivers
 device		pci
 
diff --git a/sys/riscv/include/pcpu.h b/sys/riscv/include/pcpu.h
index d00226defc2f..f11060496963 100644
--- a/sys/riscv/include/pcpu.h
+++ b/sys/riscv/include/pcpu.h
@@ -46,7 +46,8 @@
 	struct pmap *pc_curpmap;	/* Currently active pmap */	\
 	uint32_t pc_pending_ipis;	/* IPIs pending to this CPU */	\
 	uint32_t pc_hart;		/* Hart ID */			\
-	char __pad[56]			/* Pad to factor of PAGE_SIZE */
+	uint64_t pc_clock;						\
+	char __pad[48]			/* Pad to factor of PAGE_SIZE */
 
 #ifdef _KERNEL
 
diff --git a/sys/riscv/riscv/machdep.c b/sys/riscv/riscv/machdep.c
index c5da4832dd36..c0d4b7cc2726 100644
--- a/sys/riscv/riscv/machdep.c
+++ b/sys/riscv/riscv/machdep.c
@@ -219,8 +219,18 @@ cpu_flush_dcache(void *ptr, size_t len)
 int
 cpu_est_clockrate(int cpu_id, uint64_t *rate)
 {
+	struct pcpu *pc;
 
-	panic("cpu_est_clockrate");
+	pc = pcpu_find(cpu_id);
+	if (pc == NULL || rate == NULL)
+		return (EINVAL);
+
+	if (pc->pc_clock == 0)
+		return (EOPNOTSUPP);
+
+	*rate = pc->pc_clock;
+
+	return (0);
 }
 
 void