[U-Boot] [PATCH 2/3] fix: s5p_gpio: call: dev_get_addr() instead of fdtdec_get_addr()

[Stephen Warren]

On 09/24/2015 09:29 AM, Przemyslaw Marczak wrote:
> After rework in lib/fdtdec.c, the function fdtdec_get_addr()
> doesn't work for nodes with #size-cells property, set to 0.
>
> To get GPIO's 'reg' property, the code should use one of:
> fdtdec_get_addr_size_auto_no/parent() function.
>
> Fortunately dm core provides a function to get the property.
>
> This commit reworks function gpio_exynos_bind(), to properly
> use dev_get_addr() for GPIO device.
>
> This prevents setting a wrong base register for Exynos GPIOs.

Migrating everything to dev_get_addr() is the correct long-term fix, so 
this patch,

Acked-by: Stephen Warren <swarren at nvidia.com>

... although I'd have liked to see a smaller diff that didn't both 
re-order all the code /and/ call a different function, but I suppose 
that's not possible given the need to pass the device object to 
dev_get_addr(). You could have used fdtdec_get_addr_size_auto_parent() 
directly.


I think it'd be good to fix fdtdec_get_addr_size() to have the same 
semantics that it previously did. There might be other code in U-Boot 
that's affected by the same issue, and fixing fdtdec_get_addr_size() 
would make sure that all got fixed too. Are you willing to send that 
patch too?

Essentially, fdtdec_get_addr_size() used to assume:

#address-cells == sizeof(fdt_addr_t)
if sizep == NULL:
     #size-cells == 0
else:
     #size-cells == sizeof(fdt_addr_t)

However, it now assumes:

#address-cells == sizeof(fdt_addr_t)
#size-cells == sizeof(fdt_addr_t)

Let's just add that condition back by doing something like the following 
in fdtdec_get_addr_size():

u32 ns;

if (sizep)
     ns = sizeof(fdt_size_t) / sizeof(fdt32_t);
else
     ns = 0;

... and replacing the ns parameter that's passed to 
fdtdec_get_addr_size_fixed() with that variable, rather than hard-coding it.