Messages in this thread | | | From | Linus Walleij <> | Date | Wed, 2 May 2018 15:01:24 +0200 | Subject | Re: [PATCH] gpio: zynq: Setup chip->base based on alias ID |
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On Wed, May 2, 2018 at 12:15 PM, Michal Simek <michal.simek@xilinx.com> wrote: > On 2.5.2018 12:10, Linus Walleij wrote: >> On Thu, Apr 26, 2018 at 3:35 PM, Michal Simek <michal.simek@xilinx.com> wrote:
>>> Yes, it is about legacy application which I have seen recently and there >>> is no source code for application calls it because board vendor doesn't >>> provide it. >>> >>> You are right that -1 was used from the beginning in mainline but >>> unfortunately this driver was in vendor tree for a while and it uses 0 >>> there. >>> >>> In upstreaming this was changed to -1 but customers have a lot of code >>> which developed against vendor tree and they want to use >>> latest&greatest. And without this they are not able to run that >>> applications. >>> >>> I found that this logic is already in 5 drivers in mainline that's why I >>> send this patch to be +1. >> >> I see. >> >> Sadly comaptibility with out-of-tree driver code is none of our >> (community) business. >> >> We do pay a lot of effort not to break the ABI to userspace, but >> it needs to be an ABI coming from the mainline kernel, not from >> a vendor tree. >> >> So to the mainline kernel this is no regression. > > I understand your statement. On the other hand it is feature which was > permitted in past for some drivers and this is +1.
But was it permitted because of breaking out of tree code?
I know people have done questionable things in the past, but two wrongs does not make one right.
Yours, Linus Walleij
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