[U-Boot] [linux-sunxi] [PATCH 2/9] sunxi: clk: A80: add MMC clock support

[Andre Przywara]

On Mon, 21 Jan 2019 17:34:25 +0800
Chen-Yu Tsai <wens at csie.org> wrote:

> On Mon, Jan 21, 2019 at 5:32 PM Jagan Teki
> <jagan at amarulasolutions.com> wrote:
> >
> > On Sat, Jan 19, 2019 at 7:02 AM Andre Przywara
> > <andre.przywara at arm.com> wrote:  
> > >
> > > The A80 handles resets and clock gates for the MMC devices
> > > differently, outside of the CCU IP block. Consequently we have a
> > > separate clock device with a separate binding for that.
> > >
> > > Implement that with the respective clock gates and resets to
> > > allow the A80 taking part in the DM_MMC game.
> > >
> > > Signed-off-by: Andre Przywara <andre.przywara at arm.com>
> > > ---
> > >  drivers/clk/sunxi/clk_a80.c | 28 +++++++++++++++++++++++++++-
> > >  1 file changed, 27 insertions(+), 1 deletion(-)
> > >
> > > diff --git a/drivers/clk/sunxi/clk_a80.c
> > > b/drivers/clk/sunxi/clk_a80.c index d6dd6a1fa1..2bfc2ca9f5 100644
> > > --- a/drivers/clk/sunxi/clk_a80.c
> > > +++ b/drivers/clk/sunxi/clk_a80.c
> > > @@ -30,19 +30,45 @@ static const struct ccu_reset a80_resets[] = {
> > >         [RST_BUS_UART5]         = RESET(0x5b4, BIT(21)),
> > >  };
> > >
> > > +static const struct ccu_clk_gate a80_mmc_gates[] = {
> > > +       [0]                     = GATE(0x0, BIT(16)),
> > > +       [1]                     = GATE(0x4, BIT(16)),
> > > +       [2]                     = GATE(0x8, BIT(16)),
> > > +       [3]                     = GATE(0xc, BIT(16)),
> > > +};
> > > +
> > > +static const struct ccu_reset a80_mmc_resets[] = {
> > > +       [0]                     = GATE(0x0, BIT(18)),
> > > +       [1]                     = GATE(0x4, BIT(18)),
> > > +       [2]                     = GATE(0x8, BIT(18)),
> > > +       [3]                     = GATE(0xc, BIT(18)),
> > > +};
> > > +
> > >  static const struct ccu_desc a80_ccu_desc = {
> > >         .gates = a80_gates,
> > >         .resets = a80_resets,
> > >  };
> > >
> > > +static const struct ccu_desc a80_mmc_clk_desc = {
> > > +       .gates = a80_mmc_gates,
> > > +       .resets = a80_mmc_resets,
> > > +};
> > > +
> > >  static int a80_clk_bind(struct udevice *dev)
> > >  {
> > > -       return sunxi_reset_bind(dev, ARRAY_SIZE(a80_resets));
> > > +       ulong count = ARRAY_SIZE(a80_resets);
> > > +
> > > +       if (device_is_compatible(dev,
> > > "allwinner,allwinner,sun9i-a80-mmc"))
> > > +               count = ARRAY_SIZE(a80_mmc_resets);
> > > +
> > > +       return sunxi_reset_bind(dev, count);
> > >  }
> > >
> > >  static const struct udevice_id a80_ccu_ids[] = {
> > >         { .compatible = "allwinner,sun9i-a80-ccu",
> > >           .data = (ulong)&a80_ccu_desc },
> > > +       { .compatible = "allwinner,allwinner,sun9i-a80-mmc",  
> >
> > This can be "allwinner,sun9i-a80-mmc-config-clk"  
> 
> *Must*, not can. :)

Indeed, thanks for spotting this, Jagan.

Also I just figured that we need to enable the parent clocks and resets
of this clock itself. I hope we can do this unconditionally, even for
the complex CCU, as enabling fixed-clocks should be covered by the clock
framework already.

Cheers,
Andre.