[PATCH v2] pwm: atmel-hlcdc: add at91sam9x5 and sama5d3 errata handling

[Boris Brezillon]

Hi Thierry

On Thu, 4 Dec 2014 14:12:31 +0100
Thierry Reding <thierry.reding at gmail.com> wrote:

> On Wed, Nov 19, 2014 at 03:33:09PM +0100, Boris Brezillon wrote:
> > at91sam9x5 has an errata forbidding the use of slow clk as a clk source and
> > sama5d3 SoCs has another errata forbidding the use of div1 prescaler.
> > 
> > Take both of these erratas into account.
> > 
> > Signed-off-by: Boris Brezillon <boris.brezillon at free-electrons.com>
> > ---
> > Hi Thierry,
> > 
> > I've addressed the "erratas stored in of_device_id data" part, but still
> > haven't modified the compatible strings of the HLCDC subdevices.
> > 
> > Please let me know if you really want to handle erratas through pwm
> > compatibles instead of parent device compatibles.
> > 
> > Regards,
> > 
> > Boris
> > 
> > Changes since v1:
> > - use data field in of_device_id to attach erratas to an IP revision
> > 
> >  drivers/pwm/pwm-atmel-hlcdc.c | 50 ++++++++++++++++++++++++++++++++++++++-----
> >  1 file changed, 45 insertions(+), 5 deletions(-)
> 
> I applied this, but this was really much more difficult than I would've
> wanted. Since the MFD driver hasn't been merged into Linus' tree yet I
> wasn't able to actually build test this driver at all without manually
> pulling in the patches that add the MFD support. I went through this
> trouble this time because it's what we had agreed upon, but for the
> record, next time I'll request a stable branch that I can pull into the
> PWM tree to resolve this kind of dependency. Or patches will have to
> wait until the next merge window. I don't want to have to jump through
> hoops just to make sure the code in my tree actually compiles.

Thanks for doing that.
Just for my understanding, am I the one responsible for providing this
stable branch, or were you expecting Lee to provide it ?

> 
> Oh, and it's good that I do compile tests because...
> 
> > diff --git a/drivers/pwm/pwm-atmel-hlcdc.c b/drivers/pwm/pwm-atmel-hlcdc.c
> [...]
> > +const struct atmel_hlcdc_pwm_erratas atmel_hlcdc_pwm_at91sam9x5_erratas = {
> > +	.slow_clk_errata = true,
> > +};
> > +
> > +const struct atmel_hlcdc_pwm_erratas atmel_hlcdc_pwm_sama5d3_erratas = {
> > +	.div1_clk_errata = true,
> > +};
> 
> ... these actually should be static.
> 
> Also I took the liberty of substituting "erratum" for "errata" and
> "errata" for "erratas".

Indeed, thanks for fixing those problems.

Best Regards,

Boris

-- 
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com