On Mon, 18 Dec 2017 00:02:35 +0200
Baruch Siach <baruch@xxxxxxxxxx> wrote:
> Hi Miquèl,
>
> On Sun, Dec 17, 2017 at 12:18:38AM +0200, Baruch Siach wrote:
> > On Thu, Dec 14, 2017 at 11:30:04AM +0100, Miquel Raynal wrote:
> > > Bindings were incomplete for a long time by only exposing one of
> > > the two available control registers. To ease the migration to the
> > > full bindings (already in use for the Armada 375 SoC), rename the
> > > pointers for clarification. This way, it will only be needed to
> > > add another pointer to access the other control register when the
> > > time comes.
> > >
> > > This avoids dangerous situations where the offset 0 of the control
> > > area can be either one register or the other depending on the
> > > bindings used. After this change, device trees of other SoCs
> > > could be migrated to the "full" bindings if they may benefit from
> > > features from the unaccessible register, without any change in
> > > the driver.
> > >
> > > Signed-off-by: Miquel Raynal <miquel.raynal@xxxxxxxxxxxxxxxxxx>
> > > ---
> >
> > [...]
> >
> > > + /*
> > > + * Legacy DT bindings only described "control1" register
> > > (also referred
> > > + * as "control MSB" on old documentation). New bindings
> > > cover
> > > + * "control0/control LSB" and "control1/control MSB"
> > > registers within
> > > + * the same resource, which is then of size 8 instead of
> > > 4.
> > > + */
> > > + if ((res->end - res->start) == LEGACY_CONTROL_MEM_LEN) {
> > > + /* ->control0 unavailable in this configuration
> > > */
> > > + priv->control1 = control +
> > > LEGACY_CONTROL1_OFFSET;
> > > + } else {
> > > + priv->control0 = control + CONTROL0_OFFSET;
> > > + priv->control1 = control + CONTROL1_OFFSET;
> > > + }
> >
> > I think we need to add a check here that the control registers area
> > size matches the expected value given the compatible string. In
> > case of mismatch probe should fail.
Ok I will check here for the bindings used.
Still, in the a380_init() I will have to check if control0 is
valid or not because this function should handle both bindings.
>
> One more thing. You should probably use resource_size() instead of
> open coding it. resource_size() does "res->end - res->start + 1". Are
> you sure your code is correct?
It is not regarding the implementation of resource_size() (which I'm
gonna use).
>
> > > priv->data = (struct armada_thermal_data *)match->data;
> > > priv->data->init_sensor(pdev, priv);
>
> baruch
>
Thank you,
Miquèl
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