[PATCH-for-9.0? v2 2/8] hw/clock: Pass optional &bool argument to clock_set()

["Philippe Mathieu-Daudé" <philmd@linaro.org>]

Currently clock_set() returns whether the clock has
been changed or not. In order to combine this information
with other clock calls, pass an optional boolean and do
not return anything.  The single caller ignores the return
value, have it use NULL.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
---
 include/hw/clock.h       | 22 ++++++++++++++++------
 hw/core/clock.c          |  8 +++++---
 hw/misc/bcm2835_cprman.c |  2 +-
 hw/misc/zynq_slcr.c      |  4 ++--
 4 files changed, 24 insertions(+), 12 deletions(-)

diff --git a/include/hw/clock.h b/include/hw/clock.h
index bb12117f67..474bbc07fe 100644
--- a/include/hw/clock.h
+++ b/include/hw/clock.h
@@ -180,21 +180,28 @@ static inline bool clock_has_source(const Clock *clk)
  * clock_set:
  * @clk: the clock to initialize.
  * @value: the clock's value, 0 means unclocked
+ * @changed: set to true if the clock is changed, ignored if set to NULL.
  *
  * Set the local cached period value of @clk to @value.
- *
- * @return: true if the clock is changed.
  */
-bool clock_set(Clock *clk, uint64_t value);
+void clock_set(Clock *clk, uint64_t period, bool *changed);
 
 static inline bool clock_set_hz(Clock *clk, unsigned hz)
 {
-    return clock_set(clk, CLOCK_PERIOD_FROM_HZ(hz));
+    bool changed = false;
+
+    clock_set(clk, CLOCK_PERIOD_FROM_HZ(hz), &changed);
+
+    return changed;
 }
 
 static inline bool clock_set_ns(Clock *clk, unsigned ns)
 {
-    return clock_set(clk, CLOCK_PERIOD_FROM_NS(ns));
+    bool changed = false;
+
+    clock_set(clk, CLOCK_PERIOD_FROM_NS(ns), &changed);
+
+    return changed;
 }
 
 /**
@@ -220,7 +227,10 @@ void clock_propagate(Clock *clk);
  */
 static inline void clock_update(Clock *clk, uint64_t value)
 {
-    if (clock_set(clk, value)) {
+    bool changed = false;
+
+    clock_set(clk, value, &changed);
+    if (changed) {
         clock_propagate(clk);
     }
 }
diff --git a/hw/core/clock.c b/hw/core/clock.c
index c73f0c2f98..e0f257b141 100644
--- a/hw/core/clock.c
+++ b/hw/core/clock.c
@@ -52,16 +52,18 @@ void clock_clear_callback(Clock *clk)
     clock_set_callback(clk, NULL, NULL, 0);
 }
 
-bool clock_set(Clock *clk, uint64_t period)
+void clock_set(Clock *clk, uint64_t period, bool *changed)
 {
     if (clk->period == period) {
-        return false;
+        return;
     }
     trace_clock_set(CLOCK_PATH(clk), CLOCK_PERIOD_TO_HZ(clk->period),
                     CLOCK_PERIOD_TO_HZ(period));
     clk->period = period;
 
-    return true;
+    if (changed) {
+        *changed = true;
+    }
 }
 
 static uint64_t clock_get_child_period(Clock *clk)
diff --git a/hw/misc/bcm2835_cprman.c b/hw/misc/bcm2835_cprman.c
index 91c8f7bd17..f16f7978ae 100644
--- a/hw/misc/bcm2835_cprman.c
+++ b/hw/misc/bcm2835_cprman.c
@@ -680,7 +680,7 @@ static void cprman_init(Object *obj)
     s->xosc = clock_new(obj, "xosc");
     s->gnd = clock_new(obj, "gnd");
 
-    clock_set(s->gnd, 0);
+    clock_set(s->gnd, 0, NULL);
 
     memory_region_init_io(&s->iomem, obj, &cprman_ops,
                           s, "bcm2835-cprman", 0x2000);
diff --git a/hw/misc/zynq_slcr.c b/hw/misc/zynq_slcr.c
index d2ac2e77f2..e637798507 100644
--- a/hw/misc/zynq_slcr.c
+++ b/hw/misc/zynq_slcr.c
@@ -279,9 +279,9 @@ static void zynq_slcr_compute_clocks_internal(ZynqSLCRState *s, uint64_t ps_clk)
 
     /* compute uartX reference clocks */
     clock_set(s->uart0_ref_clk,
-              ZYNQ_COMPUTE_CLK(s, uart_mux, R_UART_CLK_CTRL, CLKACT0));
+              ZYNQ_COMPUTE_CLK(s, uart_mux, R_UART_CLK_CTRL, CLKACT0), NULL);
     clock_set(s->uart1_ref_clk,
-              ZYNQ_COMPUTE_CLK(s, uart_mux, R_UART_CLK_CTRL, CLKACT1));
+              ZYNQ_COMPUTE_CLK(s, uart_mux, R_UART_CLK_CTRL, CLKACT1), NULL);
 }
 
 /**
-- 
2.41.0