[PATCH 08/14] rust: qdev: add minimal clock bindings

[Paolo Bonzini]

Add the minimal support that is needed by pl011's event and tracepoint.

Signed-off-by: Paolo Bonzini <pbonz...@redhat.com>
---
 rust/qemu-api/src/qdev.rs | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/rust/qemu-api/src/qdev.rs b/rust/qemu-api/src/qdev.rs
index 6d619661ba4..64b961136b2 100644
--- a/rust/qemu-api/src/qdev.rs
+++ b/rust/qemu-api/src/qdev.rs
@@ -449,6 +449,39 @@ fn init_gpio_out(&self, pins: &[InterruptSource]) {
 
 impl<R: ObjectDeref> DeviceMethods for R where R::Target: IsA<DeviceState> {}
 
+impl Clock {
+    pub const PERIOD_1SEC: u64 = bindings::CLOCK_PERIOD_1SEC;
+
+    pub const fn period_from_ns(ns: u64) -> u64 {
+        ns * Self::PERIOD_1SEC / 1_000_000_000
+    }
+
+    pub const fn period_from_hz(hz: u64) -> u64 {
+        if hz == 0 {
+            0
+        } else {
+            Self::PERIOD_1SEC / hz
+        }
+    }
+
+    pub const fn period_to_hz(period: u64) -> u64 {
+        if period == 0 {
+            0
+        } else {
+            Self::PERIOD_1SEC / period
+        }
+    }
+
+    pub const fn get(&self) -> u64 {
+        // SAFETY: Clock is returned by init_clock_in with zero value for 
period
+        unsafe { &*self.0.as_ptr() }.period
+    }
+
+    pub const fn get_hz(&self) -> u64 {
+        Self::period_to_hz(self.get())
+    }
+}
+
 unsafe impl ObjectType for Clock {
     type Class = ObjectClass;
     const TYPE_NAME: &'static CStr =
-- 
2.50.1