Hi Jerome,
thank you for taking the time to go through this!
On Tue, Oct 1, 2019 at 3:29 PM Jerome Brunet <jbrunet@xxxxxxxxxxxx> wrote:
[...]
> > +#include <linux/platform_device.h>
> > +#include <linux/mfd/syscon.h>
>
> syscon is not used in the driver
oops, good catch - thank you
[...]
> > +static struct clk_hw_onecell_data meson8_ddr_clk_hw_onecell_data = {
> > + .hws = {
> > + [DDR_CLKID_DDR_PLL_DCO] = &meson8_ddr_pll_dco.hw,
> > + [DDR_CLKID_DDR_PLL] = &meson8_ddr_pll.hw,
>
> I wonder if onecell is not overkill for this driver. We won't expose the
> DCO, so only the post divider remains
>
> Do you expect this provider to have more than one leaf clock ?
> If not, maybe you could use of_clk_hw_simple_get() instead ?
there's some more clock bits in DDR_CLK_CNTL - the public A311D
datasheet has a description for these bits but I'm not sure they do
the same on Meson8/Meson8b/Meson8m2
all I know is that some magic bytes are written to DDR_CLK_CNTL in the
old u-boot code
that's why I don't want to make any assumptions and play safe here (by
using a onecell clock provider)
> > + },
> > + .num = 2,
> > +};
> > +
> > +static struct clk_regmap *const meson8_ddr_clk_regmaps[] = {
> > + &meson8_ddr_pll_dco,
> > + &meson8_ddr_pll,
> > +};
> > +
> > +static const struct regmap_config meson8_ddr_clkc_regmap_config = {
> > + .reg_bits = 8,
> > + .val_bits = 32,
> > + .reg_stride = 4,
> > + .fast_io = true,
>
> I think fast_io will default to true with memory based register.
> Setting the max_register would be nice
good point - I'll take care of this when sending v2
Martin
