Re: [PATCH v2] clk-rcar-gen2: ADSP clock support

[Sergei Shtylyov]

Hello.

On 1/5/2015 4:13 PM, Geert Uytterhoeven wrote:

> > Add the ADSP clock support to the R-Car generation 2 CPG driver.  This clock
> > gets derived from  PLL1.  The layout of the ADSPCKCR register is  similar to
> > those of the clocks supported by the 'clk-div6' driver but the divider encoding
> > is non-linear, so can't be supported by that driver...

> > Based on the original patch by Konstantin Kozhevnikov
> > <konstantin.kozhevnikov@xxxxxxxxxxxxxxxxxx>.

> > Signed-off-by: Sergei Shtylyov <sergei.shtylyov@xxxxxxxxxxxxxxxxxx>

> > ---
> > The patch is against the 'clk-next' branch of Mike Turquette's 'linux.git' repo
> > plus the RCAN clock support patch posted last week.

> > Changes in version 2:
> > - swapped "adsp" and "rcan" in the binding document.

> > +++ linux/drivers/clk/shmobile/clk-rcar-gen2.c
> > @@ -33,6 +33,7 @@ struct rcar_gen2_cpg {
[...]
> > @@ -162,6 +163,51 @@ static struct clk * __init cpg_z_clk_reg
> >          return clk;
> >   }
> >
> > +/* ADSP divisors */
> > +static const struct clk_div_table cpg_adsp_div_table[] = {
> > +       {  1,  3 }, {  2,  4 }, {  3,  6 }, {  4,  8 },
> > +       {  5, 12 }, {  6, 16 }, {  7, 18 }, {  8, 24 },
> > +       { 10, 36 }, { 11, 48 }, {  0,  0 },
> > +};
> > +
> > +static struct clk * __init cpg_adsp_clk_register(struct rcar_gen2_cpg *cpg)
> > +{
> > +       const char *parent_name = "pll1";
> > +       struct clk_divider *div;
> > +       struct clk_gate *gate;
> > +       struct clk *clk;
> > +
> > +       div = kzalloc(sizeof(*div), GFP_KERNEL);
> > +       if (!div)
> > +               return ERR_PTR(-ENOMEM);
> > +
> > +       div->reg = cpg->reg + CPG_ADSPCKCR;
> > +       div->width = 4;
> > +       div->table = cpg_adsp_div_table;
> > +       div->lock = &cpg->lock;
> > +
> > +       gate = kzalloc(sizeof(*gate), GFP_KERNEL);
> > +       if (!gate) {
> > +               kfree(div);
> > +               return ERR_PTR(-ENOMEM);
> > +       }
> > +
> > +       gate->reg = cpg->reg + CPG_RCANCKCR;

> Shouldn't this be CPG_ADSPCKCR?

   Oops! At least I did it right for the divider component. :-)

> > +       gate->bit_idx = 8;
> > +       gate->flags = CLK_GATE_SET_TO_DISABLE;
> > +       gate->lock = &cpg->lock;
> > +
> > +       clk = clk_register_composite(NULL, "adsp", &parent_name, 1, NULL, NULL,
> > +                                    &div->hw, &clk_divider_ops,
> > +                                    &gate->hw, &clk_gate_ops, 0);
> > +       if (IS_ERR(clk)) {
> > +               kfree(gate);
> > +               kfree(div);
> > +       }
> > +
> > +       return clk;
> > +}

> Please insert the adsp code after the rcan code, to match the clock order
> in bindings and #defines.

   OK. I placed it basing on the register offset...

[...]
> > @@ -301,6 +347,8 @@ rcar_gen2_cpg_register_clock(struct devi
> >                  shift = 0;
> >          } else if (!strcmp(name, "z")) {
> >                  return cpg_z_clk_register(cpg);
> > +       } else if (!strcmp(name, "adsp")) {
> > +               return cpg_adsp_clk_register(cpg);

> Please insert the adsp code after the rcan code.

   OK.

WBR, Sergei

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