linux-kernel - Re: [PATCH 1/3] clk: samsung: exynos5420: add VPLL rate table for g3d clock

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Message-ID: <CANAwSgRqvw454E2twn+RwGGhy0XQE0T=k2dKfD50CWVk88p=rQ@mail.gmail.com>
Date:   Mon, 26 Nov 2018 14:21:45 +0530
From:   Anand Moon <linux.amoon@...il.com>
To:     Chanwoo Choi <cw00.choi@...sung.com>
Cc:     Kukjin Kim <kgene@...nel.org>, linux-samsung-soc@...r.kernel.org,
        "open list:COMMON CLK FRAMEWORK" <linux-clk@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel <linux-kernel@...r.kernel.org>,
        devicetree <devicetree@...r.kernel.org>,
        Sylwester Nawrocki <s.nawrocki@...sung.com>,
        Tomasz Figa <tomasz.figa@...il.com>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Andrzej Hajda <a.hajda@...sung.com>,
        Marian Mihailescu <mihailescu2m@...il.com>
Subject: Re: [PATCH 1/3] clk: samsung: exynos5420: add VPLL rate table for g3d clock

Hi Chanwoo,

On Mon, 26 Nov 2018 at 13:18, Chanwoo Choi <cw00.choi@...sung.com> wrote:
>
> Hi,
>
> On 2018년 11월 23일 18:44, Anand Moon wrote:
> > From: Marian Mihailescu <mihailescu2m@...il.com>
> >
> > A specific clock rate table is added for VPLL so it is possible
> > to set frequency of the VPLL output clock that used by the g3d clock.
> >
> > Cc: Andrzej Hajda <a.hajda@...sung.com>
> > Cc: Chanwoo Choi <cw00.choi@...sung.com>
> > Signed-off-by: Marian Mihailescu <mihailescu2m@...il.com>
> > Signed-off-by: Anand Moon <linux.amoon@...il.com>
> > ---
> >  drivers/clk/samsung/clk-exynos5420.c | 13 +++++++++++++
> >  1 file changed, 13 insertions(+)
> >
> > diff --git a/drivers/clk/samsung/clk-exynos5420.c b/drivers/clk/samsung/clk-exynos5420.c
> > index 34cce3c5898f..34156bdfd0d2 100644
> > --- a/drivers/clk/samsung/clk-exynos5420.c
> > +++ b/drivers/clk/samsung/clk-exynos5420.c
> > @@ -1303,6 +1303,18 @@ static const struct samsung_pll_rate_table exynos5420_epll_24mhz_tbl[] = {
> >       PLL_36XX_RATE(24 * MHZ,  32768001U, 131, 3, 5, 4719),
> >  };
> >
> > +static const struct samsung_pll_rate_table exynos5420_vpll_24mhz_tbl[] __initconst = {
> > +     PLL_35XX_RATE(24 * MHZ, 600000000U, 200, 2, 2),
> > +     PLL_35XX_RATE(24 * MHZ, 543000000U, 181, 2, 2),
> > +     PLL_35XX_RATE(24 * MHZ, 533000000U, 533, 6, 2),
> > +     PLL_35XX_RATE(24 * MHZ, 480000000U, 320, 4, 2),
> > +     PLL_35XX_RATE(24 * MHZ, 420000000U, 140, 2, 2),
> > +     PLL_35XX_RATE(24 * MHZ, 350000000U, 175, 3, 2),
> > +     PLL_35XX_RATE(24 * MHZ, 266000000U, 266, 3, 3),
> > +     PLL_35XX_RATE(24 * MHZ, 177000000U, 118, 2, 3),
> > +     PLL_35XX_RATE(24 * MHZ, 100000000U, 200, 3, 4),
> > +};
>
> VPLL has the same PMS table with apll/kpll/bpll. You don't need to add new
> 'exynos5420_vpll_24mhz_tbl' table. Just adding the missing frequency entries
> to 'exynos5420_pll2550x_24mhz_tbl' table.
>
Thanks for your input. I will leave this for the expert to fix this.

> > +
> >  static struct samsung_pll_clock exynos5x_plls[nr_plls] __initdata = {
> >       [apll] = PLL(pll_2550, CLK_FOUT_APLL, "fout_apll", "fin_pll", APLL_LOCK,
> >               APLL_CON0, NULL),
> > @@ -1428,6 +1440,7 @@ static void __init exynos5x_clk_init(struct device_node *np,
> >               exynos5x_plls[epll].rate_table = exynos5420_epll_24mhz_tbl;
> >               exynos5x_plls[kpll].rate_table = exynos5420_pll2550x_24mhz_tbl;
> >               exynos5x_plls[bpll].rate_table = exynos5420_pll2550x_24mhz_tbl;
> > +             exynos5x_plls[vpll].rate_table = exynos5420_vpll_24mhz_tbl;
> >       }
> >
> >       samsung_clk_register_pll(ctx, exynos5x_plls, ARRAY_SIZE(exynos5x_plls),
> >
>
>
> --
> Best Regards,
> Chanwoo Choi
> Samsung Electronics

Best Regards
-Anand