diff mbox series

[3/6] dt-bindings: clk: r9a07g044-cpg: Add entry for P0_DIV2 core clock

Message ID 20210715182123.23372-4-prabhakar.mahadev-lad.rj@bp.renesas.com (mailing list archive)
State Superseded
Delegated to: Geert Uytterhoeven
Headers show
Series Renesas RZ/G2L CANFD support | expand

Commit Message

Prabhakar July 15, 2021, 6:21 p.m. UTC 
Add P0_DIV2 core clock required for CANFD module. CANFD core clock is
sourced from P0_DIV2 referenced from HW manual Rev.0.50.

Also add R9A07G044_LAST_CORE_CLK entry to avoid changes in
r9a07g044-cpg.c file.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Biju Das <biju.das.jz@bp.renesas.com>
---
 include/dt-bindings/clock/r9a07g044-cpg.h | 2 ++
 1 file changed, 2 insertions(+)

Comments

Geert Uytterhoeven July 16, 2021, 8:07 a.m. UTC | #1 
Hi Prabhakar,

Thanks for your patch!

On Thu, Jul 15, 2021 at 8:21 PM Lad Prabhakar
<prabhakar.mahadev-lad.rj@bp.renesas.com> wrote:
> Add P0_DIV2 core clock required for CANFD module. CANFD core clock is
> sourced from P0_DIV2 referenced from HW manual Rev.0.50.

OK.

> Also add R9A07G044_LAST_CORE_CLK entry to avoid changes in
> r9a07g044-cpg.c file.

I'm not so fond of adding this.  Unlike the other definitions, it is
not really part of the bindings, but merely a convenience definition
for the driver.  Furthermore it has to change when a new definition
is ever added.

> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> Reviewed-by: Biju Das <biju.das.jz@bp.renesas.com>
> ---
>  include/dt-bindings/clock/r9a07g044-cpg.h | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/include/dt-bindings/clock/r9a07g044-cpg.h b/include/dt-bindings/clock/r9a07g044-cpg.h
> index 0728ad07ff7a..2fd20db0b2f4 100644
> --- a/include/dt-bindings/clock/r9a07g044-cpg.h
> +++ b/include/dt-bindings/clock/r9a07g044-cpg.h
> @@ -30,6 +30,8 @@
>  #define R9A07G044_CLK_P2               19
>  #define R9A07G044_CLK_AT               20
>  #define R9A07G044_OSCCLK               21
> +#define R9A07G044_CLK_P0_DIV2          22
> +#define R9A07G044_LAST_CORE_CLK                23

Third issue: off-by-one error, it should be 22 ;-)

>
>  /* R9A07G044 Module Clocks */
>  #define R9A07G044_CA55_SCLK            0

Gr{oetje,eeting}s,

                        Geert


--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
Lad, Prabhakar July 16, 2021, 8:45 a.m. UTC | #2 
Hi Geert,

Thank you for the review.

On Fri, Jul 16, 2021 at 9:08 AM Geert Uytterhoeven <geert@linux-m68k.org> wrote:
>
> Hi Prabhakar,
>
> Thanks for your patch!
>
> On Thu, Jul 15, 2021 at 8:21 PM Lad Prabhakar
> <prabhakar.mahadev-lad.rj@bp.renesas.com> wrote:
> > Add P0_DIV2 core clock required for CANFD module. CANFD core clock is
> > sourced from P0_DIV2 referenced from HW manual Rev.0.50.
>
> OK.
>
> > Also add R9A07G044_LAST_CORE_CLK entry to avoid changes in
> > r9a07g044-cpg.c file.
>
> I'm not so fond of adding this.  Unlike the other definitions, it is
> not really part of the bindings, but merely a convenience definition
> for the driver.  Furthermore it has to change when a new definition
> is ever added.
>
Agreed will drop this.

> > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> > Reviewed-by: Biju Das <biju.das.jz@bp.renesas.com>
> > ---
> >  include/dt-bindings/clock/r9a07g044-cpg.h | 2 ++
> >  1 file changed, 2 insertions(+)
> >
> > diff --git a/include/dt-bindings/clock/r9a07g044-cpg.h b/include/dt-bindings/clock/r9a07g044-cpg.h
> > index 0728ad07ff7a..2fd20db0b2f4 100644
> > --- a/include/dt-bindings/clock/r9a07g044-cpg.h
> > +++ b/include/dt-bindings/clock/r9a07g044-cpg.h
> > @@ -30,6 +30,8 @@
> >  #define R9A07G044_CLK_P2               19
> >  #define R9A07G044_CLK_AT               20
> >  #define R9A07G044_OSCCLK               21
> > +#define R9A07G044_CLK_P0_DIV2          22
> > +#define R9A07G044_LAST_CORE_CLK                23
>
> Third issue: off-by-one error, it should be 22 ;-)
>
23 was intentionally as these numbers aren't used for core clock count
we use r9a07g044_core_clks[] instead. Said that I'll drop this.

Cheers,
Prabhakar
> >
> >  /* R9A07G044 Module Clocks */
> >  #define R9A07G044_CA55_SCLK            0
>
> Gr{oetje,eeting}s,
>
>                         Geert
>
>
> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
>
> In personal conversations with technical people, I call myself a hacker. But
> when I'm talking to journalists I just say "programmer" or something like that.
>                                 -- Linus Torvalds
Geert Uytterhoeven July 16, 2021, 8:56 a.m. UTC | #3 
Hi Prabhakar,

On Fri, Jul 16, 2021 at 10:45 AM Lad, Prabhakar
<prabhakar.csengg@gmail.com> wrote:
> On Fri, Jul 16, 2021 at 9:08 AM Geert Uytterhoeven <geert@linux-m68k.org> wrote:
> > On Thu, Jul 15, 2021 at 8:21 PM Lad Prabhakar
> > <prabhakar.mahadev-lad.rj@bp.renesas.com> wrote:
> > > Add P0_DIV2 core clock required for CANFD module. CANFD core clock is
> > > sourced from P0_DIV2 referenced from HW manual Rev.0.50.
> >
> > OK.
> >
> > > Also add R9A07G044_LAST_CORE_CLK entry to avoid changes in
> > > r9a07g044-cpg.c file.
> >
> > I'm not so fond of adding this.  Unlike the other definitions, it is
> > not really part of the bindings, but merely a convenience definition
> > for the driver.  Furthermore it has to change when a new definition
> > is ever added.
> >
> Agreed will drop this.
>
> > > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> > > Reviewed-by: Biju Das <biju.das.jz@bp.renesas.com>
> > > ---
> > >  include/dt-bindings/clock/r9a07g044-cpg.h | 2 ++
> > >  1 file changed, 2 insertions(+)
> > >
> > > diff --git a/include/dt-bindings/clock/r9a07g044-cpg.h b/include/dt-bindings/clock/r9a07g044-cpg.h
> > > index 0728ad07ff7a..2fd20db0b2f4 100644
> > > --- a/include/dt-bindings/clock/r9a07g044-cpg.h
> > > +++ b/include/dt-bindings/clock/r9a07g044-cpg.h
> > > @@ -30,6 +30,8 @@
> > >  #define R9A07G044_CLK_P2               19
> > >  #define R9A07G044_CLK_AT               20
> > >  #define R9A07G044_OSCCLK               21
> > > +#define R9A07G044_CLK_P0_DIV2          22
> > > +#define R9A07G044_LAST_CORE_CLK                23
> >
> > Third issue: off-by-one error, it should be 22 ;-)
> >
> 23 was intentionally as these numbers aren't used for core clock count
> we use r9a07g044_core_clks[] instead.

It ends up as an off-by-one bug in the range check in
rzg2l_cpg_clk_src_twocell_get().

> Said that I'll drop this.

OK.

Gr{oetje,eeting}s,

                        Geert
Lad, Prabhakar July 16, 2021, 9:02 a.m. UTC | #4 
Hi Geert,

On Fri, Jul 16, 2021 at 9:56 AM Geert Uytterhoeven <geert@linux-m68k.org> wrote:
>
> Hi Prabhakar,
>
> On Fri, Jul 16, 2021 at 10:45 AM Lad, Prabhakar
> <prabhakar.csengg@gmail.com> wrote:
> > On Fri, Jul 16, 2021 at 9:08 AM Geert Uytterhoeven <geert@linux-m68k.org> wrote:
> > > On Thu, Jul 15, 2021 at 8:21 PM Lad Prabhakar
> > > <prabhakar.mahadev-lad.rj@bp.renesas.com> wrote:
> > > > Add P0_DIV2 core clock required for CANFD module. CANFD core clock is
> > > > sourced from P0_DIV2 referenced from HW manual Rev.0.50.
> > >
> > > OK.
> > >
> > > > Also add R9A07G044_LAST_CORE_CLK entry to avoid changes in
> > > > r9a07g044-cpg.c file.
> > >
> > > I'm not so fond of adding this.  Unlike the other definitions, it is
> > > not really part of the bindings, but merely a convenience definition
> > > for the driver.  Furthermore it has to change when a new definition
> > > is ever added.
> > >
> > Agreed will drop this.
> >
> > > > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> > > > Reviewed-by: Biju Das <biju.das.jz@bp.renesas.com>
> > > > ---
> > > >  include/dt-bindings/clock/r9a07g044-cpg.h | 2 ++
> > > >  1 file changed, 2 insertions(+)
> > > >
> > > > diff --git a/include/dt-bindings/clock/r9a07g044-cpg.h b/include/dt-bindings/clock/r9a07g044-cpg.h
> > > > index 0728ad07ff7a..2fd20db0b2f4 100644
> > > > --- a/include/dt-bindings/clock/r9a07g044-cpg.h
> > > > +++ b/include/dt-bindings/clock/r9a07g044-cpg.h
> > > > @@ -30,6 +30,8 @@
> > > >  #define R9A07G044_CLK_P2               19
> > > >  #define R9A07G044_CLK_AT               20
> > > >  #define R9A07G044_OSCCLK               21
> > > > +#define R9A07G044_CLK_P0_DIV2          22
> > > > +#define R9A07G044_LAST_CORE_CLK                23
> > >
> > > Third issue: off-by-one error, it should be 22 ;-)
> > >
> > 23 was intentionally as these numbers aren't used for core clock count
> > we use r9a07g044_core_clks[] instead.
>
> It ends up as an off-by-one bug in the range check in
> rzg2l_cpg_clk_src_twocell_get().
>
Ooops missed that!

Cheers,
Prabhakar

> > Said that I'll drop this.
>
> OK.
>
> Gr{oetje,eeting}s,
>
>                         Geert
>
> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
>
> In personal conversations with technical people, I call myself a hacker. But
> when I'm talking to journalists I just say "programmer" or something like that.
>                                 -- Linus Torvalds
diff mbox series

Patch

diff --git a/include/dt-bindings/clock/r9a07g044-cpg.h b/include/dt-bindings/clock/r9a07g044-cpg.h
index 0728ad07ff7a..2fd20db0b2f4 100644
--- a/include/dt-bindings/clock/r9a07g044-cpg.h
+++ b/include/dt-bindings/clock/r9a07g044-cpg.h
@@ -30,6 +30,8 @@ 
 #define R9A07G044_CLK_P2		19
 #define R9A07G044_CLK_AT		20
 #define R9A07G044_OSCCLK		21
+#define R9A07G044_CLK_P0_DIV2		22
+#define R9A07G044_LAST_CORE_CLK		23
 
 /* R9A07G044 Module Clocks */
 #define R9A07G044_CA55_SCLK		0