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Date: Fri, 24 May 2019 17:25:26 -0700 From: Frank Rowand <frowand.list@...il.com> To: Saravana Kannan <saravanak@...gle.com> Cc: Rob Herring <robh+dt@...nel.org>, Mark Rutland <mark.rutland@....com>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, "Rafael J. Wysocki" <rafael@...nel.org>, devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, Android Kernel Team <kernel-team@...roid.com> Subject: Re: [PATCH v1 0/5] Solve postboot supplier cleanup and optimize probe ordering On 5/24/19 5:22 PM, Frank Rowand wrote: > On 5/24/19 2:53 PM, Saravana Kannan wrote: >> On Fri, May 24, 2019 at 10:49 AM Frank Rowand <frowand.list@...il.com> wrote: >>> >>> On 5/23/19 6:01 PM, Saravana Kannan wrote: > > < snip > > >>> Another flaw with this method is that existing device trees >>> will be broken after the kernel is modified, because existing >>> device trees do not have the depends-on property. This breaks >>> the devicetree compatibility rules. >> >> This is 100% not true with the current implementation. I actually >> tested this. This is fully backwards compatible. That's another reason >> for adding depends-on and going by just what it says. The existing >> bindings were never meant to describe only mandatory dependencies. So >> using them as such is what would break backwards compatibility. > > Are you saying that an existing, already compiled, devicetree (an FDT) > can be used to boot a new kernel that has implemented this patch set? > > The new kernel will boot with the existing FDT that does not have > any depends-on properties? I overlooked something you said in the email I replied to. You said: "that depends-on becomes the source of truth if it exists and falls back to existing common bindings if "depends-on" isn't present" Let me go back to look at the patch series to see how it falls back to the existing bindings. > > -Frank >
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