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Date: Fri, 17 Feb 2017 13:45:44 +0100 From: Tobias Jakobi <tjakobi@...h.uni-bielefeld.de> To: Maxime Ripard <maxime.ripard@...e-electrons.com> Cc: ML dri-devel <dri-devel@...ts.freedesktop.org>, Rob Herring <robh+dt@...nel.org>, Mark Rutland <mark.rutland@....com>, wens@...e.org, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, thomas.petazzoni@...e-electrons.com, devicetree@...r.kernel.org, linux-kernel <linux-kernel@...r.kernel.org>, linux-mm@...ck.org, linux-arm-kernel@...ts.infradead.org Subject: Re: [PATCH 0/8] ARM: sun8i: a33: Mali improvements Hello Maxime, Maxime Ripard wrote: > Hi, > > On Thu, Feb 16, 2017 at 01:43:06PM +0100, Tobias Jakobi wrote: >> I was wondering about the following. Wasn't there some strict >> requirement about code going upstream, which also included that there >> was a full open-source driver stack for it? >> >> I don't see how this is the case for Mali, neither in the kernel, nor in >> userspace. I'm aware that the Mali kernel driver is open-source. But it >> is not upstream, maintained out of tree, and won't land upstream in its >> current form (no resemblence to a DRM driver at all). And let's not talk >> about the userspace part. >> >> So, why should this be here? > > The device tree is a representation of the hardware itself. The state > of the driver support doesn't change the hardware you're running on, > just like your BIOS/UEFI on x86 won't change the device it reports to > Linux based on whether it has a driver for it. Like Emil already said, the new bindings and the DT entries are solely introduced to support a proprietary out-of-tree module. The current workflow when introducing new DT entries is the following: - upstream a driver that uses the entries - THEN add the new entries I'm against adding such entries without having any upstream "consumer". With best wishes, Tobias > So yes, unfortunately, we don't have a driver upstream at the > moment. But that doesn't prevent us from describing the hardware > accurately. > > Maxime >
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