linux-kernel - Re: [PATCH v5 3/8] clk: samsung: add BPLL rate table for Exynos 5422 SoC

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Date:   Wed, 6 Mar 2019 08:05:44 +0100
From:   Lukasz Luba <l.luba@...tner.samsung.com>
To:     Chanwoo Choi <cw00.choi@...sung.com>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
        linux-samsung-soc@...r.kernel.org
Cc:     b.zolnierkie@...sung.com, krzk@...nel.org, kgene@...nel.org,
        kyungmin.park@...sung.com, m.szyprowski@...sung.com,
        s.nawrocki@...sung.com, myungjoo.ham@...sung.com
Subject: Re: [PATCH v5 3/8] clk: samsung: add BPLL rate table for Exynos
 5422 SoC

Hi Chanwoo,

On 3/6/19 2:31 AM, Chanwoo Choi wrote:
> Hi Lukasz,
> 
> I'm talking about it repeatedly. How many times already, I mentioned
> that you have to resend the patch after completed the discussion.
> 
> 
> I replied this v3 patch[2]. But, you didn't reply or answer anything
> and then just send the same patch without any consent.
> 
> - Re: [PATCH v3 3/8] clk: samsung: add BPLL rate table for Exynos 5422 SoC
> [2] https://lkml.org/lkml/2019/2/11/198
The second table from the example is not compiled and never be.
The rates where tested and they work. As I said the BPLL is used only
for DMC, thus it can be used instead of the default
exynos5420_pll2550x_24mhz_tbl.
It is worth to keep it as a separate table because adding
these entries to generic PLL table might cause issues for other PLLs.

Regards,
Lukasz
> 
> 
> 
> On 19. 3. 5. 오후 7:19, 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@...tner.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 6da5875..6f5db70 100644
>> --- a/drivers/clk/samsung/clk-exynos5420.c
>> +++ b/drivers/clk/samsung/clk-exynos5420.c
>> @@ -1331,6 +1331,17 @@ 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),
>> @@ -1473,7 +1484,7 @@ 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;
>>   	}
>>   
>>   	samsung_clk_register_pll(ctx, exynos5x_plls, ARRAY_SIZE(exynos5x_plls),
>>
> 
>