Messages in this thread | | | Date | Wed, 6 Jan 2016 15:25:31 -0800 | From | Brian Norris <> | Subject | Re: [PATCH v5] mtd: support BB SRAM on ICP DAS LP-8x4x |
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On Sun, Dec 20, 2015 at 01:43:58PM +0300, Sergei Ianovich wrote: > On Sat, 2015-12-19 at 21:38 -0600, Rob Herring wrote: > > On Tue, Dec 15, 2015 at 09:58:53PM +0300, Sergei Ianovich wrote: > > > +Required properties: > > > +- compatible : should be "icpdas,sram-lp8x4x" > > > > No wildcards please. Otherwise looks fine. > > There is a similar review comment from Arnd Bergmann in the discussion > of `[PATCH v5] serial: support for 16550A serial ports on LP-8x4x`. > > I'll quote my latest clarification: > > ... This driver will support ports on LP-8081,
^^ So 8081 doesn't even match the wildcard scheme you give in the compatible string, proving the point of the Conventional Wisdom suggestion Rob gave...
> > LP-8141, LP-8441, LP-8841. Last time I checked the vendor was announcing > > a series with 3 as the last digit. They use lp8x4x name, eg. in > > documentation like `LP-8x4x_ChangeLog.txt`. They ship their proprietary > > SDK in `lp8x4x_sdk_for_linux.tar`. All of this implies that it is a > > single board. > > I think the solution should be the same for all LP-8x4x drivers (IRQ, > SRAM, SERIAL, IIO).
The rationale is described here:
http://devicetree.org/Device_Tree_Usage#Understanding_the_compatible_Property
Quote: > Warning: Don't use wildcard compatible values, like "fsl,mpc83xx-uart" > or similar. Silicon vendors will invariably make a change that breaks > your wildcard assumptions the moment it is too late to change it. > Instead, choose a specific silicon implementations and make all > subsequent silicon compatible with it.
I don't think your circumstance is anything unique.
Regards, Brian
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