[U-Boot] Patches for in-house board

Hi,

We are a consulting firm that has produced a product for a client which contains at Atmel AT91SAM9263 running linux. I have registed a machine type at kernel.org and have ported both u-boot and the kernel to it. I have created patches to add this support against u-boot HEAD. Is it standard practice to submit the patches to u-boot or is it preferred that I only make them available to the client?