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From: Geert Uytterhoeven <geert@linux-m68k.org>
To: Biju Das <biju.das.jz@bp.renesas.com>
Cc: Michael Turquette <mturquette@baylibre.com>,
	Stephen Boyd <sboyd@kernel.org>,
	Linux-Renesas <linux-renesas-soc@vger.kernel.org>,
	linux-clk <linux-clk@vger.kernel.org>,
	Chris Paterson <Chris.Paterson2@renesas.com>,
	Biju Das <biju.das@bp.renesas.com>,
	Prabhakar Mahadev Lad <prabhakar.mahadev-lad.rj@bp.renesas.com>
Subject: Re: [PATCH net-next 03/18] drivers: clk: renesas: r9a07g044-cpg: Add ethernet clock sources
Date: Mon, 26 Jul 2021 13:50:07 +0200	[thread overview]
Message-ID: <CAMuHMdWRckaH1snBt12Xbv90V_sNW2VM7+CZvmD9CaLcpdGWOQ@mail.gmail.com> (raw)
In-Reply-To: <OS0PR01MB592269086F41E4E83BBFE48486E89@OS0PR01MB5922.jpnprd01.prod.outlook.com>

Hi Biju,

On Mon, Jul 26, 2021 at 1:43 PM Biju Das <biju.das.jz@bp.renesas.com> wrote:
> > Subject: Re: [PATCH net-next 03/18] drivers: clk: renesas: r9a07g044-cpg:
> > Add ethernet clock sources
> > On Thu, Jul 22, 2021 at 4:14 PM Biju Das <biju.das.jz@bp.renesas.com>
> > wrote:
> > > Ethernet reference clock can be sourced from PLL5_2 or PLL6_2. Add
> > > support for ethernet source clock selection using SEL_PLL_6_2 mux.
> > >
> > > Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
> > > Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> >
> > Thanks for your patch!
> >
> > > --- a/drivers/clk/renesas/r9a07g044-cpg.c
> > > +++ b/drivers/clk/renesas/r9a07g044-cpg.c
> > > @@ -35,8 +35,10 @@ enum clk_ids {
> > >         CLK_PLL3_DIV4,
> > >         CLK_PLL4,
> > >         CLK_PLL5,
> > > +       CLK_PLL5_2,
> >
> > Why do you need this? We already have CLK_PLL5_DIV2?
>
> As per clock list HP =250 MHz.
>
> With PLL5_DIV2 the frequency, what we get is 3000 x 1/2 = 1500 MHz, which is incorrect
>
> There is some issue with HW manual. It is not clear. I have requested to fix those issue.
>
> Actually PLL5 generates 3 clk outputs (As per page 403 of manual)
>
> FOUTPOSTDIV= 3000
> FOUT3 = 500
> FOUT1PH0 = 1500
>
> To match the clock list document and Figure 8.3 Clock system diagram for HP clock.
> This clock has to be FOUT3.
>
> FOUT3(second PLL5 clock source)* 1/2 =250 MHz(HP clock).
>
> On the HW manual, Divider name for PLL5 is mentioned as PLL_5_2_DIV12 and for PLL6 as PLL6_2_DIV2.
>
> >
> > >         CLK_PLL5_DIV2,
> > >         CLK_PLL6,
> > > +       CLK_PLL6_DIV2,
> > >         CLK_P1_DIV2,
> > >
> > >         /* Module Clocks */
> > > @@ -53,6 +55,9 @@ static const struct clk_div_table dtable_1_32[] = {
> > >         {0, 0},
> > >  };
> > >
> > > +/* Mux clock tables */
> > > +static const char * const sel_pll6_2[] = { ".pll6_2_div2",
> > > +".pll5_2_div2" };
> >
> > ".pll6_div2", ".pll5_div2"
>
> Basically PLL6 generates 2 clock outputs. That is the reason it is termed as PLL6_2 for second clock
> And pll5 generates 3 clock outputs and pll5_2(second clock source) is used for HP.
>
> To match the register definition, I will change this to ".pll6_2_div2" and ".pll5_2_div12". Is it ok?

OK, thanks for the explanation!

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

  reply	other threads:[~2021-07-26 11:50 UTC|newest]

Thread overview: 55+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-22 14:13 [PATCH net-next 00/18] Add Gigabit Ethernet driver support Biju Das
2021-07-22 14:13 ` [PATCH net-next 01/18] dt-bindings: net: renesas,etheravb: Document Gigabit Ethernet IP Biju Das
2021-07-22 14:13 ` [PATCH net-next 02/18] drivers: clk: renesas: rzg2l-cpg: Add support to handle MUX clocks Biju Das
2021-07-23 10:26   ` Sergei Shtylyov
2021-07-23 12:12     ` Biju Das
2021-07-26 10:53   ` Geert Uytterhoeven
2021-07-26 12:23     ` Biju Das
2021-07-22 14:13 ` [PATCH net-next 03/18] drivers: clk: renesas: r9a07g044-cpg: Add ethernet clock sources Biju Das
2021-07-26 10:50   ` Geert Uytterhoeven
2021-07-26 11:43     ` Biju Das
2021-07-26 11:50       ` Geert Uytterhoeven [this message]
2021-07-22 14:13 ` [PATCH net-next 04/18] drivers: clk: renesas: r9a07g044-cpg: Add GbEthernet clock/reset Biju Das
2021-07-26 10:11   ` Geert Uytterhoeven
2021-07-26 10:18     ` Biju Das
2021-07-22 14:13 ` [PATCH net-next 05/18] ravb: Replace chip type with a structure for driver data Biju Das
2021-07-22 20:42   ` Sergei Shtylyov
2021-07-23  6:08     ` Biju Das
2021-07-22 14:13 ` [PATCH net-next 06/18] ravb: Factorise ptp feature Biju Das
2021-07-23 20:56   ` Sergei Shtylyov
2021-07-26  9:01     ` Biju Das
2021-07-26 13:08       ` Andrew Lunn
2021-07-26 13:41         ` Biju Das
2021-07-22 14:13 ` [PATCH net-next 07/18] ravb: Add features specific to R-Car Gen3 Biju Das
2021-07-22 14:13 ` [PATCH net-next 08/18] ravb: Add R-Car common features Biju Das
2021-07-27 20:48   ` Sergei Shtylyov
2021-07-28 10:13     ` Biju Das
2021-07-28 13:45       ` Andrew Lunn
2021-07-29 15:10         ` Biju Das
2021-07-22 14:13 ` [PATCH net-next 09/18] ravb: Factorise ravb_ring_free function Biju Das
2021-07-29 18:02   ` Sergei Shtylyov
2021-07-30  6:21     ` Biju Das
2021-08-20 15:32       ` Biju Das
2021-07-22 14:13 ` [PATCH net-next 10/18] ravb: Factorise ravb_ring_format function Biju Das
2021-07-29 18:30   ` Sergei Shtylyov
2021-07-30  6:24     ` Biju Das
2021-07-22 14:13 ` [PATCH net-next 11/18] ravb: Factorise ravb_ring_init function Biju Das
2021-07-29 18:53   ` Sergei Shtylyov
2021-07-30  6:54     ` Biju Das
2021-07-22 14:13 ` [PATCH net-next 12/18] ravb: Factorise {emac,dmac} init function Biju Das
2021-08-02 19:41   ` Sergei Shtylyov
2021-08-20 15:42     ` Biju Das
2021-08-20 18:57       ` Sergey Shtylyov
2021-08-20 19:44         ` Biju Das
2021-07-22 14:13 ` [PATCH net-next 13/18] ravb: Factorise ravb_rx function Biju Das
2021-07-22 14:13 ` [PATCH net-next 14/18] ravb: Factorise ravb_adjust_link function Biju Das
2021-07-22 14:13 ` [PATCH net-next 15/18] ravb: Factorise ravb_set_features Biju Das
2021-07-22 14:13 ` [PATCH net-next 16/18] ravb: Add reset support Biju Das
2021-07-22 14:13 ` [PATCH net-next 17/18] ravb: Add GbEthernet driver support Biju Das
2021-07-22 14:13 ` [PATCH net-next 18/18] arm64: dts: renesas: r9a07g044: Add GbEther nodes Biju Das
2021-07-22 20:53 ` [PATCH net-next 00/18] Add Gigabit Ethernet driver support Sergei Shtylyov
2021-07-22 21:07   ` Andrew Lunn
2021-07-23  6:28     ` Biju Das
2021-07-26 10:55       ` Geert Uytterhoeven
2021-07-26 13:49         ` Arnd Bergmann
2021-07-23  6:23   ` Biju Das

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