linux-kernel - Re: [PATCH v2 07/18] ARM: dts: DRA7: Change the parent of apll_pcie_in_clk_mux to dpll_pcie_ref_m2ldo

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Message-ID: <53A2DEDA.5050104@ti.com>
Date:	Thu, 19 Jun 2014 18:30:10 +0530
From:	Kishon Vijay Abraham I <kishon@...com>
To:	Tero Kristo <t-kristo@...com>, <devicetree@...r.kernel.org>,
	<linux-doc@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-omap@...r.kernel.org>, <linux-pci@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
CC:	<arnd@...db.de>, <tony@...mide.com>, <jg1.han@...sung.com>,
	Keerthy <j-keerthy@...com>, Rajendra Nayak <rnayak@...com>,
	Paul Walmsley <paul@...an.com>
Subject: Re: [PATCH v2 07/18] ARM: dts: DRA7: Change the parent of apll_pcie_in_clk_mux
 to dpll_pcie_ref_m2ldo_ck

Hi Tero,

On Thursday 19 June 2014 04:42 PM, Tero Kristo wrote:
> On 05/29/2014 09:38 AM, Kishon Vijay Abraham I wrote:
>> From: Keerthy <j-keerthy@...com>
>>
>> Change the parent of apll_pcie_in_clk_mux to dpll_pcie_ref_m2ldo_ck
>> from dpll_pcie_ref_ck.
> 
> Why? Needs a better changelog also.

Figure 26-22. DPLL_PCIE_REF Functional Block Diagram in vE of DRA7xx ES1.0 TRM
shows the signal name for the output of post divider (M2) is CLKOUTLDO.

Figure 26-21. PCIe PHY Clock Generator Overview shows CLKOUTLDO is used as
input to apll mux.

So the actual output of dpll should be dpll_pcie_ref_m2ldo_ck instead of
dpll_pcie_ref_ck (which is the input of apll mux).

Thanks
Kishon
> 
> -Tero
> 
>>
>> Cc: Rajendra Nayak <rnayak@...com>
>> Cc: Tero Kristo <t-kristo@...com>
>> Cc: Paul Walmsley <paul@...an.com>
>> Signed-off-by: Keerthy <j-keerthy@...com>
>> Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
>> ---
>>   arch/arm/boot/dts/dra7xx-clocks.dtsi |    2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/arch/arm/boot/dts/dra7xx-clocks.dtsi
>> b/arch/arm/boot/dts/dra7xx-clocks.dtsi
>> index 55e95c5..44993ec 100644
>> --- a/arch/arm/boot/dts/dra7xx-clocks.dtsi
>> +++ b/arch/arm/boot/dts/dra7xx-clocks.dtsi
>> @@ -1152,7 +1152,7 @@
>>
>>       apll_pcie_in_clk_mux: apll_pcie_in_clk_mux@...06118 {
>>           compatible = "ti,mux-clock";
>> -        clocks = <&dpll_pcie_ref_ck>, <&pciesref_acs_clk_ck>;
>> +        clocks = <&dpll_pcie_ref_m2ldo_ck>, <&pciesref_acs_clk_ck>;
>>           #clock-cells = <0>;
>>           reg = <0x021c 0x4>;
>>           ti,bit-shift = <7>;
>>
> 
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