[PATCH v11 1/4] dt-bindings: pinctrl: mt8195: add rsel define

[zhiyong.tao]

On Thu, 2021-09-02 at 11:35 +0800, Chen-Yu Tsai wrote:
> On Thu, Sep 2, 2021 at 10:54 AM zhiyong.tao <zhiyong.tao at mediatek.com
> > wrote:
> > 
> > On Wed, 2021-09-01 at 12:35 +0800, Chen-Yu Tsai wrote:
> > > On Mon, Aug 30, 2021 at 8:36 AM Zhiyong Tao <
> > > zhiyong.tao at mediatek.com> wrote:
> > > > 
> > > > This patch adds rsel define for mt8195.
> > > > 
> > > > Signed-off-by: Zhiyong Tao <zhiyong.tao at mediatek.com>
> > > > ---
> > > >  include/dt-bindings/pinctrl/mt65xx.h | 9 +++++++++
> > > >  1 file changed, 9 insertions(+)
> > > > 
> > > > diff --git a/include/dt-bindings/pinctrl/mt65xx.h b/include/dt-
> > > > bindings/pinctrl/mt65xx.h
> > > > index 7e16e58fe1f7..f5934abcd1bd 100644
> > > > --- a/include/dt-bindings/pinctrl/mt65xx.h
> > > > +++ b/include/dt-bindings/pinctrl/mt65xx.h
> > > > @@ -16,6 +16,15 @@
> > > >  #define MTK_PUPD_SET_R1R0_10 102
> > > >  #define MTK_PUPD_SET_R1R0_11 103
> > > > 
> > > > +#define MTK_PULL_SET_RSEL_000  200
> > > > +#define MTK_PULL_SET_RSEL_001  201
> > > > +#define MTK_PULL_SET_RSEL_010  202
> > > > +#define MTK_PULL_SET_RSEL_011  203
> > > > +#define MTK_PULL_SET_RSEL_100  204
> > > > +#define MTK_PULL_SET_RSEL_101  205
> > > > +#define MTK_PULL_SET_RSEL_110  206
> > > > +#define MTK_PULL_SET_RSEL_111  207
> > > 
> > > Could you keep the spacing between constants tighter, or have no
> > > spacing
> > > at all? Like having MTK_PULL_SET_RSEL_000 defined as 104 and so
> > > on. This
> > > would reduce the chance of new macro values colliding with actual
> > > resistor
> > > values set in the datasheets, plus a contiguous space would be
> > > easy to
> > > rule as macros.
> > > 
> > > ChenYu
> > 
> > Hi chenyu,
> > By the current solution, it won't be mixed used by
> > MTK_PULL_SET_RSEL_XXX
> > and real  resistor value.
> > If user use MTK_PULL_SET_RSEL_XXX, They don't care the define which
> > means how much resistor value.
> 
> What I meant was that by keeping the value space tight, we avoid the
> situation where in some new chip, one of the RSEL resistors happens
> to
> be 200 or 300 ohms. 100 is already taken, so there's nothing we can
> do if new designs actually do have 100 ohm settings.
> 
> > We think that we don't contiguous macro space for different
> > register.
> > It may increase code complexity to make having
> > MTK_PULL_SET_RSEL_000
> > defined as 104.
> 
> Can you elaborate? It is a simple range check and offset handling.
> Are
> you concerned that a new design would have R2R1R0 and you would like
> the macros to be contiguous?
> 
> BTW I don't quite get why decimal base values (100, 200, etc.) were
> chosen. One would think that binary bases are easier to handle in
> code.
> 
> 
> ChenYu
> 

Yes,we concerned that a new design would have R2R1R0 and we would like
the macros to be contiguous in the feature. we reserve it.

We think that decimal and binary base values are the same for the
feature.

> > Thanks.
> > 
> > > 
> > > >  #define MTK_DRIVE_2mA  2
> > > >  #define MTK_DRIVE_4mA  4
> > > >  #define MTK_DRIVE_6mA  6
> > > > --
> > > > 2.18.0
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