Re: [PATCH v6 03/10] clk: samsung: add BPLL rate table for Exynos 5422 SoC

Chanwoo Choi
2019-05-02T05:14:47Z

Hi Lukasz,

On 19. 4. 19. 오후 11:19, Lukasz Luba wrote:
> Add new table rate for BPLL for Exynos5422 SoC supporting Dynamic Memory
> Controller frequencies for driver's DRAM timings.
>
> Signed-off-by: Lukasz Luba <l.luba@partner.samsung.com>
> ---
> drivers/clk/samsung/clk-exynos5420.c | 13 ++++++++++++-
> 1 file changed, 12 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/clk/samsung/clk-exynos5420.c b/drivers/clk/samsung/clk-exynos5420.c
> index d9e6653..ddee8bd 100644
> --- a/drivers/clk/samsung/clk-exynos5420.c
> +++ b/drivers/clk/samsung/clk-exynos5420.c
> @@ -1323,6 +1323,17 @@ static const struct samsung_pll_rate_table exynos5420_pll2550x_24mhz_tbl[] __ini
> PLL_35XX_RATE(24 * MHZ, 200000000, 200, 3, 3),
> };
>
> +static const struct samsung_pll_rate_table exynos5422_bpll_rate_table[] = {
> + PLL_35XX_RATE(24 * MHZ, 825000000, 275, 4, 1),
> + PLL_35XX_RATE(24 * MHZ, 728000000, 182, 3, 1),
> + PLL_35XX_RATE(24 * MHZ, 633000000, 211, 4, 1),
> + PLL_35XX_RATE(24 * MHZ, 543000000, 181, 2, 2),
> + PLL_35XX_RATE(24 * MHZ, 413000000, 413, 6, 2),
> + PLL_35XX_RATE(24 * MHZ, 275000000, 275, 3, 3),
> + PLL_35XX_RATE(24 * MHZ, 206000000, 206, 3, 3),
> + PLL_35XX_RATE(24 * MHZ, 165000000, 110, 2, 3),
> +};
> +
> static const struct samsung_pll_rate_table exynos5420_epll_24mhz_tbl[] = {
> PLL_36XX_RATE(24 * MHZ, 600000000U, 100, 2, 1, 0),
> PLL_36XX_RATE(24 * MHZ, 400000000U, 200, 3, 2, 0),
> @@ -1465,7 +1476,7 @@ static void __init exynos5x_clk_init(struct device_node *np,
> exynos5x_plls[apll].rate_table = exynos5420_pll2550x_24mhz_tbl;
> 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[bpll].rate_table = exynos5422_bpll_rate_table;

According to your previous reply, the released odroid-xu3 board by hardkernel
might be only CONFIG_SOC_EXYNOS5422_REV_0. Because the kernel configurattion
from hardkernel has 'CONFIG_SOC_EXYNOS5422_REV_0=y'. I'm ok about adding bpll rate_table.

But, just I have one question. I think that this bpll rate_table is for
only Exynos5422 series. Because the kernel of hardkernel used
driver/clk/samsung/clk-exynos5422.c instead of clk-exynos5420.c commonn driver.
It means that the clk-exynos5422.c of hardkernel's kernel support only Exynos5422
without any considering the Exynos5420 series.

I think that it might need to check the soc version to use
bpll rate_table as following:

--- a/drivers/clk/samsung/clk-exynos5420.c
+++ b/drivers/clk/samsung/clk-exynos5420.c
@@ -1438,7 +1438,10 @@ static void __init exynos5x_clk_init(struct device_node *np,
exynos5x_plls[apll].rate_table = exynos5420_pll2550x_24mhz_tbl;
exynos5x_plls[epll].rate_table = exynos5420_epll_24mhz_tbl;
exynos5x_plls[kpll].rate_table = exynos5420_pll2550x_24mhz_tbl;
- exynos5x_plls[bpll].rate_table = exynos5422_bpll_rate_table;
+
+ if (soc == EXYNOS5800)
+ exynos5x_plls[bpll].rate_table
+ = exynos5422_bpll_rate_table;
}

> }
>
> samsung_clk_register_pll(ctx, exynos5x_plls, ARRAY_SIZE(exynos5x_plls),
>

--
Best Regards,
Chanwoo Choi
Samsung Electronics