[Xen-devel] [ARM:PATCH v2 1/1] Pass the timer clock-frequency to DOM0

[Suriyan Ramasami <suriyan.r@xxxxxxxxx>]

    xen/arm: Pass the timer "clock-frequency" to DOM0 in make_timer_node

    If the DT representing the ARM generic timer mentions a clock-frequency,
    propragate it to the DT that is built for DOM0.

    This is necessary as a workaround for boards (Odroid-XU) where CNTFRQ is
    not set or returns a wrong value.

Signed-off-by: Suriyan Ramasami <suriyan.r@xxxxxxxxx>

---
Changed since v1:
    * Fix typo for quotes around clock-frequency.

---
 xen/arch/arm/domain_build.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c
index c9dda0e..645f9c6 100644
--- a/xen/arch/arm/domain_build.c
+++ b/xen/arch/arm/domain_build.c
@@ -622,6 +622,8 @@ static int make_timer_node(const struct domain *d, void 
*fdt,
     int res;
     const struct dt_irq *irq;
     gic_interrupt_t intrs[3];
+    u32 clock_frequency;
+    bool_t clock_valid;
 
     DPRINT("Create timer node\n");
 
@@ -639,6 +641,9 @@ static int make_timer_node(const struct domain *d, void 
*fdt,
         return -FDT_ERR_XEN(ENOENT);
     }
 
+    clock_valid = dt_property_read_u32(dev, "clock-frequency",
+                                       &clock_frequency);
+
     res = fdt_begin_node(fdt, "timer");
     if ( res )
         return res;
@@ -663,6 +668,13 @@ static int make_timer_node(const struct domain *d, void 
*fdt,
     if ( res )
         return res;
 
+    if ( clock_valid )
+    {
+        res = fdt_property_cell(fdt, "clock-frequency", clock_frequency);
+        if ( res )
+            return res;
+    }
+
     res = fdt_end_node(fdt);
 
     return res;
-- 
1.8.3.2


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