Re: [Xen-devel] [ARM:PATCH v3 1/1] Pass the timer clock-frequency to DOM0 xen/arm: Pass the timer "clock-frequency" to DOM0 in make_timer_node()

[Julien Grall <julien.grall@xxxxxxxxxx>]

Hello Suriyan,

Thank you for the patch.

On 04/14/2014 09:14 AM, Suriyan Ramasami wrote:
>     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>
> 
> ---
> Changed since v2:
>     * Gather all changes in one place.
>     * Added additional comments
> 
> Changed since v1:
>     * Fix typo for quotes around clock-frequency.
> ---
>  xen/arch/arm/domain_build.c | 11 +++++++++++
>  1 file changed, 11 insertions(+)
> 
> diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c
> index 502db84..a86d756 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");
>  
> @@ -663,6 +665,15 @@ 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)

On Xen, the coding style request if to be:

if ( clock_valid )

With this change:

Reviewed-by: Julien Grall <julien.grall@xxxxxxxxxx>

Regards,

-- 
Julien Grall

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