[U-Boot] [PATCH 3/3] spi/kirkwood: add weak functions board_spi_claim/release_bus

[Valentin Longchamp]

On 05/24/2012 10:38 AM, Prafulla Wadaskar wrote:
>> -----Original Message-----
>> From: Valentin Longchamp [mailto:valentin.longchamp at keymile.com]
>> Sent: 16 May 2012 16:24
>> To: Prafulla Wadaskar; holger.brunck at keymile.com
>> Cc: Valentin Longchamp; u-boot at lists.denx.de; Holger Brunck; Prafulla
>> Wadaskar
>> Subject: [PATCH 3/3] spi/kirkwood: add weak functions
>> board_spi_claim/release_bus
>>
>> This allows a final, board specific, step in the claim/relase_bus
>> function for the SPI controller, which may be needed for some hardware
>> designs.
> 
> NAK, this is not needed if earlier two patches in the patch series are in place.
> 

In our case, this is still needed. As I had already explained you in the
previous discussion, even with the generic approach, our hardware design
requires one access to an additional signal (a GPIO) to configure an external HW
multiplexer which is present to electrically remove the Nand Flash device from
the signals used by the SPI bus and put it back when the accesses are over.

That's why my first implementation was only relying on these weak functions.