linux-kernel - Re: [PATCH v2 06/18] ARM: dts: DRA7: Add divider table to optfclk_pciephy

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Date:	Thu, 19 Jun 2014 18:15:53 +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 06/18] ARM: dts: DRA7: Add divider table to optfclk_pciephy_div
 clock

Hi Tero,

On Thursday 19 June 2014 04:40 PM, Tero Kristo wrote:
> On 05/29/2014 09:38 AM, Kishon Vijay Abraham I wrote:
>> From: Keerthy <j-keerthy@...com>
>>
>> Add divider table to optfclk_pciephy_div clock. The Documentation
>> for divider clock can be found at ../clock/ti/divider.txt
> 
> This patch requires a better changelog. Why is the change done, any TRM refs etc.?

The 8th bit of CM_CLKMODE_APLL_PCIE can be programmed to either 0x0 or 0x1
based on if the divider value is 0x2 or 0x1.

Figure 26-21. PCIe PHY Clock Generator Overview in vE of DRA7xx ES1.0 shows the
block diagram of Clock Generator Subsystem of PCIe PHY module. We have to do a
bypass (divided by 1) in order to get the correct PCIE_PHY_DIV_GCLK
frequency.

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 |    1 +
>>   1 file changed, 1 insertion(+)
>>
>> diff --git a/arch/arm/boot/dts/dra7xx-clocks.dtsi
>> b/arch/arm/boot/dts/dra7xx-clocks.dtsi
>> index c767687..55e95c5 100644
>> --- a/arch/arm/boot/dts/dra7xx-clocks.dtsi
>> +++ b/arch/arm/boot/dts/dra7xx-clocks.dtsi
>> @@ -1170,6 +1170,7 @@
>>           clocks = <&apll_pcie_ck>;
>>           #clock-cells = <0>;
>>           reg = <0x021c>;
>> +        ti,dividers = <2>, <1>;
>>           ti,bit-shift = <8>;
>>           ti,max-div = <2>;
>>       };
>>
> 
--
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