[PATCH 3/5] mx51: Add mx51 processor to the pwm driver

[Sascha Hauer]

On Tue, Nov 16, 2010 at 08:50:32PM +0100, Uwe Kleine-König wrote:
> On Tue, Nov 16, 2010 at 10:36:35AM -0800, Fabio Estevam wrote:
> > Signed-off-by: Fabio Estevam <fabio.estevam at freescale.com>
> > ---
> >  arch/arm/plat-mxc/pwm.c |    8 +++++---
> >  1 files changed, 5 insertions(+), 3 deletions(-)
> > 
> > diff --git a/arch/arm/plat-mxc/pwm.c b/arch/arm/plat-mxc/pwm.c
> > index c36f263..c6cdced 100644
> > --- a/arch/arm/plat-mxc/pwm.c
> > +++ b/arch/arm/plat-mxc/pwm.c
> > @@ -26,7 +26,7 @@
> >  #define MX1_PWMP    0x08   /* PWM Period Register */
> >  
> >  
> > -/* i.MX27, i.MX31, i.MX35 share the same PWM function block: */
> > +/* i.MX25/27/31/35/51 share the same PWM function block: */
> If this is correct, ...
> >  
> >  #define MX3_PWMCR                 0x00    /* PWM Control Register */
> >  #define MX3_PWMSAR                0x0C    /* PWM Sample Register */
> > @@ -57,7 +57,7 @@ int pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns)
> >      if (pwm == NULL || period_ns == 0 || duty_ns > period_ns)
> >          return -EINVAL;
> >  
> > -    if (cpu_is_mx27() || cpu_is_mx3() || cpu_is_mx25()) {
> > +    if (cpu_is_mx27() || cpu_is_mx3() || cpu_is_mx25() || cpu_is_mx51()) {
> >          unsigned long long c;
> >          unsigned long period_cycles, duty_cycles, prescale;
> >          u32 cr;
> > @@ -79,7 +79,7 @@ int pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns)
> >  
> >          cr = MX3_PWMCR_PRESCALER(prescale) | MX3_PWMCR_EN;
> >  
> > -        if (cpu_is_mx25())
> > +        if (cpu_is_mx25() || cpu_is_mx51())
> I wonder why mx27 and mx3 are missing here.

Look at the code. We are already inside a mx27/3/25 block and we have to
do this only on mx25.

> 
> >              cr |= MX3_PWMCR_CLKSRC_IPG;
> >          else
> >              cr |= MX3_PWMCR_CLKSRC_IPG_HIGH;
> > @@ -198,6 +198,7 @@ static int __devinit mxc_pwm_probe(struct platform_device *pdev)
> >  
> >      if (IS_ERR(pwm->clk)) {
> >          ret = PTR_ERR(pwm->clk);
> > +        dev_err(&pdev->dev, "can't get PWM clock\n");
> >          goto err_free;
> >      }
> >  
> > @@ -233,6 +234,7 @@ static int __devinit mxc_pwm_probe(struct platform_device *pdev)
> >      mutex_unlock(&pwm_lock);
> >  
> >      platform_set_drvdata(pdev, pwm);
> > +    dev_info(&pdev->dev, "i.MX PWM Driver Enabled\n");
> >      return 0;
> >  
> >  err_free_mem:
> Some general comments for this driver:
> 
>  - should move to drivers/something
>  - IMHO should use platform ids to get rid of the cpu_is_ stuff

Agreed, but this of course should be the scope of another patch.

Sascha

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