[PATCH v6 7/9] riscv: clk: Add CLINT clock to kendryte clock driver

[Sean Anderson <seanga2@gmail.com>]

Another "virtual" clock (in the sense that it isn't configurable). This
could possibly be done as a clock in the device tree, but I think this is a
bit cleaner.

Signed-off-by: Sean Anderson <seanga2@gmail.com>
---
checkpatch still complains about this one, but I don't see any reason to
break it up even further. It doesn't make sense to me to split the header
file change from everything else.

(no changes since v2)

Changes in v2:
- Split Kendryte binding changes into their own commit

 drivers/clk/kendryte/clk.c              | 4 ++++
 include/dt-bindings/clock/k210-sysctl.h | 1 +
 2 files changed, 5 insertions(+)

diff --git a/drivers/clk/kendryte/clk.c b/drivers/clk/kendryte/clk.c
index 981b3b7699..bb196961af 100644
--- a/drivers/clk/kendryte/clk.c
+++ b/drivers/clk/kendryte/clk.c
@@ -646,6 +646,10 @@ static int k210_clk_probe(struct udevice *dev)
 	REGISTER_GATE(K210_CLK_RTC,   "rtc",   in0);
 #undef REGISTER_GATE
 
+	/* The MTIME register in CLINT runs at one 50th the CPU clock speed */
+	clk_dm(K210_CLK_CLINT,
+	       clk_register_fixed_factor(NULL, "clint", "cpu", 0, 1, 50));
+
 	return 0;
 }
 
diff --git a/include/dt-bindings/clock/k210-sysctl.h b/include/dt-bindings/clock/k210-sysctl.h
index 0e3ed3fb9f..fe852bbd92 100644
--- a/include/dt-bindings/clock/k210-sysctl.h
+++ b/include/dt-bindings/clock/k210-sysctl.h
@@ -55,5 +55,6 @@
 #define K210_CLK_OTP    43
 #define K210_CLK_RTC    44
 #define K210_CLK_ACLK   45
+#define K210_CLK_CLINT  46
 
 #endif /* CLOCK_K210_SYSCTL_H */
-- 
2.28.0