linux-kernel - Re: [PATCH v3 01/12] clk: samsung: exynos5433: Add clocks using common clock framework

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Date:	Fri, 30 Jan 2015 09:50:13 +0900
From:	Chanwoo Choi <cw00.choi@...sung.com>
To:	Sylwester Nawrocki <s.nawrocki@...sung.com>
Cc:	Tomasz Figa <tomasz.figa@...il.com>,
	Mike Turquette <mturquette@...aro.org>,
	Kukjin Kim <kgene@...nel.org>,
	"pankaj.dubey@...sung.com" <pankaj.dubey@...sung.com>,
	"inki.dae@...sung.com" <inki.dae@...sung.com>,
	"chanho61.park@...sung.com" <chanho61.park@...sung.com>,
	Seung-Woo Kim <sw0312.kim@...sung.com>,
	linux-samsung-soc <linux-samsung-soc@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 01/12] clk: samsung: exynos5433: Add clocks using common
 clock framework

Hi Sylwester,

On 01/29/2015 09:53 PM, Sylwester Nawrocki wrote:
> Hi Chanwoo,
> 
> On 23/01/15 21:54, Chanwoo Choi wrote:
>> On Sat, Jan 24, 2015 at 2:40 AM, Sylwester Nawrocki
>> <s.nawrocki@...sung.com> wrote:
>>> On 21/01/15 07:26, Chanwoo Choi wrote:
>>>> +/* list of all parent clock list */
>>>
>>>> +PNAME(mout_bus_pll_user_p)   = { "fin_pll", "sclk_bus_pll", };
>>> ...
>>>> +
>>>> +static struct samsung_mux_clock top_mux_clks[] __initdata = {
>>>
>>>> +     MUX(CLK_MOUT_BUS_PLL_USER, "mout_bus_pll_user", mout_bus_pll_user_p,
>>>> +                     MUX_SEL_TOP1, 0, 1),
>>> ...
>>>> +};
>>>> +
>>>> +static struct samsung_div_clock top_div_clks[] __initdata = {
>>> ...
>>>> +     /* DIV_TOP3 */
>>>> +     DIV(CLK_DIV_ACLK_IMEM_SSSX_266, "div_aclk_imem_sssx_266",
>>>> +                     "mout_bus_pll_user", DIV_TOP3, 24, 3),
>>>
>>> Shouldn't "fin_pll" be renamed to "oscclk" ? In the documentation
>>> the root clock (from XXTI input pin) seems to be referred as OSCCLK.
>>> And I can't see "fin_pll" clock registered anywhere. Shouldn't there
>>> be a "fixed-rate-clock" as a parent of at least CMU_TOP? e.g.
>>
>> Right,
>> I added "fin_pll" fixed clock in DT as following:
>> When I registered "fin_pll" fixed clock, I could use "fin_pll" clock
>> for exynos5433 cmu without adding additional dt node.
>>
>> fin_pll: xxti {
>>         compatible = "fixed-clock";
>>         clock-output-names = "fin_pll";
>>         #clock-cells = <0>;
>> };
>>
>> I'll add the example of "fin_pll" dt node to documentation for exynos5433 cmu.
> 
> OK, thanks. But I think it needs to be named "oscclk", FIN_PLL is almost
> not existent in the SoC's documentation.
> I'd suggest to define the root oscillator clock (XXTI/OSCCLK) as "oscclk"
> in DT, rather than registering "fin_pll" fixed clock in the driver.

OK,
I'll fix it by using "oscclk" clock name instead of "fin_pll".

> 
>>> xxti: xxti {
>>>         compatible = "fixed-clock";
>>>         #clock-cells = <0>;
>>>         clock-output-names = "oscclk";
>>>         clock-frequency = <24000000>;
>>> };
>>>
>>> &cmu_top {
>>>         clocks = <&xxti>;
>>> };

Best Regards,
Chanwoo Choi

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