Re: [Xen-devel] [PATCHv2 3/5] xen/arm: Add the new OMAP UART driver.

[Julien Grall <julien.grall@xxxxxxxxxx>]

On 08/07/2013 02:14 PM, Chen Baozi wrote:
> TI OMAP UART introduces some features such as register access modes, which
> makes its configuration and interrupt handling differs from 8250 compatible
> UART. Thus, we seperate this driver from ns16550's implementation.
> 
> Signed-off-by: Chen Baozi <baozich@xxxxxxxxx>
> ---
>  config/arm32.mk               |   1 +
>  xen/common/device_tree.c      |  15 ++
>  xen/drivers/char/Makefile     |   1 +
>  xen/drivers/char/omap-uart.c  | 352 
> ++++++++++++++++++++++++++++++++++++++++++
>  xen/include/xen/8250-uart.h   |  59 ++++++-
>  xen/include/xen/device_tree.h |   6 +
>  6 files changed, 431 insertions(+), 3 deletions(-)
>  create mode 100644 xen/drivers/char/omap-uart.c
> 
> diff --git a/config/arm32.mk b/config/arm32.mk
> index 8e21158..76e229d 100644
> --- a/config/arm32.mk
> +++ b/config/arm32.mk
> @@ -11,6 +11,7 @@ CFLAGS += -marm
>  
>  HAS_PL011 := y
>  HAS_EXYNOS4210 := y
> +HAS_OMAP := y
>  
>  # Use only if calling $(LD) directly.
>  LDFLAGS_DIRECT += -EL
> diff --git a/xen/common/device_tree.c b/xen/common/device_tree.c
> index 84d704d..b392c60 100644
> --- a/xen/common/device_tree.c
> +++ b/xen/common/device_tree.c
> @@ -574,6 +574,21 @@ const void *dt_get_property(const struct dt_device_node 
> *np,
>      return pp ? pp->value : NULL;
>  }
>  
> +int dt_property_read_u32(const struct dt_device_node *np,
> +                            const char *name, u32 *out_value)
> +{
> +    u32 len;
> +    const __be32 *val;
> +
> +    val = dt_get_property(np, name, &len);
> +    if ( !val || len > 4 )
> +        return 1;
> +
> +    *out_value = be32_to_cpup(val);
> +
> +    return 0;
> +}
> +

This function only returns two values (0 or 1). Can you use bool_t and
return true (ie 1) if it succeeded.

Cheers,

-- 
Julien


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