[Xen-changelog] [xen master] xen/arm: Pass the timer "clock-frequency" to DOM0 in make_timer_node()

[patchbot@xxxxxxx]

commit 94191dcee8ff9f8b925824e54741f28b954bf95e
Author:     Suriyan Ramasami <suriyan.r@xxxxxxxxx>
AuthorDate: Mon Apr 14 01:14:00 2014 -0700
Commit:     Ian Campbell <ian.campbell@xxxxxxxxxx>
CommitDate: Wed Apr 16 17:10:57 2014 +0100

    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.
    
    Ideally CNTFRQ should be set by the boot loader. The bootloader should 
respect
    the ARM ARM (see B.8.1.1):
        "The CNTFRQ register is UNKNOWN at reset, and therefore the counter
        frequency must written to CNTFRQ as part of the system boot process."
    
    For the Odroid-XU the SPL BL2 code is entered in NS HYP mode which prevents
    the execution of the mcr call to set CNTFRQ.
    
    Signed-off-by: Suriyan Ramasami <suriyan.r@xxxxxxxxx>
    Reviewed-by: Julien Grall <julien.grall@xxxxxxxxxx>
    Acked-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
---
 xen/arch/arm/domain_build.c |   11 +++++++++++
 1 files changed, 11 insertions(+), 0 deletions(-)

diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c
index df34c6d..187e071 100644
--- a/xen/arch/arm/domain_build.c
+++ b/xen/arch/arm/domain_build.c
@@ -618,6 +618,8 @@ 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");
 
@@ -659,6 +661,15 @@ static int make_timer_node(const struct domain *d, void 
*fdt,
     if ( res )
         return res;
 
+    clock_valid = dt_property_read_u32(dev, "clock-frequency",
+                                       &clock_frequency);
+    if ( clock_valid )
+    {
+        res = fdt_property_cell(fdt, "clock-frequency", clock_frequency);
+        if ( res )
+            return res;
+    }
+
     res = fdt_end_node(fdt);
 
     return res;
--
generated by git-patchbot for /home/xen/git/xen.git#master

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