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Re: [PATCH v2 02/24] hw/misc/mps2-scc: Support configurable number of OS

From: Peter Maydell
Subject: Re: [PATCH v2 02/24] hw/misc/mps2-scc: Support configurable number of OSCCLK values
Date: Mon, 15 Feb 2021 13:06:40 +0000

On Mon, 15 Feb 2021 at 12:02, Philippe Mathieu-Daudé <f4bug@amsat.org> wrote:
> On 2/15/21 12:51 PM, Peter Maydell wrote:
> > Currently the MPS2 SCC device implements a fixed number of OSCCLK
> > values (3).  The variant of this device in the MPS3 AN524 board has 6
> > OSCCLK values.  Switch to using a PROP_ARRAY, which allows board code
> > to specify how large the OSCCLK array should be as well as its
> > values.
> >
> > With a variable-length property array, the SCC no longer specifies
> > default values for the OSCCLKs, so we must set them explicitly in the
> > board code.  This defaults are actually incorrect for the an521 and
> > an505; we will correct this bug in a following patch.
> >
> > This is a migration compatibility break for all the mps boards.
> >
> > Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
> R-b stands :)
> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>

Yeah, it's down here...

> > It would be possible to avoid the compat break, but we've already
> > broken compat for the mps boards this release cycle (eg in commit
> > eeae0b2bf4e69de2) when we added Clock support to the armsse code, so
> > there's no point in trying to keep compat for this change.
> > Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>

...below the '---' material, because the script I use to add
the r-by tags isn't clever enough to figure out that it ought to
add them above the '---' line rather than just at the bottom
of the commit message. Sorry about that.

-- PMM

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