[PATCH v4 09/10] pwm: Add PXA support

[Thierry Reding]

* Shawn Guo wrote:
> On Wed, Mar 14, 2012 at 04:56:32PM +0100, Thierry Reding wrote:
> > Signed-off-by: Thierry Reding <thierry.reding at avionic-design.de>
> > ---
> > Changes in v3:
> >   - update PWM ops for changes in patch 2
> > 
> >  arch/arm/plat-pxa/Makefile |    1 -
> >  arch/arm/plat-pxa/pwm.c    |  304 --------------------------------------------
> >  drivers/pwm/Kconfig        |    9 ++
> >  drivers/pwm/Makefile       |    1 +
> >  drivers/pwm/pwm-pxa.c      |  244 +++++++++++++++++++++++++++++++++++
> >  5 files changed, 254 insertions(+), 305 deletions(-)
> >  delete mode 100644 arch/arm/plat-pxa/pwm.c
> >  create mode 100644 drivers/pwm/pwm-pxa.c
> > 
> The patch should be generated with "git format-patch -M", so that we
> can see the diff like below. 
> 
> --- a/arch/arm/plat-pxa/pwm.c
> +++ b/drivers/pwm/pwm-pxa.c

Yes, Arnd already mentioned that in the last round but I forgot. It usually
takes me a couple of weeks to prepare the next version and I try to keep a
list of TODOs but that doesn't seem to be efficient enough yet.

> -int pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns)
> +static int pxa_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
> +                         int duty_ns, int period_ns)
>  {
> +       struct pxa_pwm_chip *pc = to_pxa_pwm_chip(chip);
>         unsigned long long c;
>         unsigned long period_cycles, prescale, pv, dc;
> +       unsigned long offset;
> 
> -       if (pwm == NULL || period_ns == 0 || duty_ns > period_ns)
> +       if (period_ns == 0 || duty_ns > period_ns)
>                 return -EINVAL;
> 
> Then I will have a question why "pwm == NULL" check is removed?

Actually, as I mentioned in another mail the idea was to put these kinds of
checks into the core. They are still missing from the core, though.

Thierry
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