diff mbox

[v2,06/18] ARM: dts: DRA7: Add divider table to optfclk_pciephy_div clock

Message ID 1401345500-20188-7-git-send-email-kishon@ti.com
State New, archived
Headers show

Commit Message

Kishon Vijay Abraham I May 29, 2014, 6:38 a.m. UTC
From: Keerthy <j-keerthy@ti.com>

Add divider table to optfclk_pciephy_div clock. The Documentation
for divider clock can be found at ../clock/ti/divider.txt

Cc: Rajendra Nayak <rnayak@ti.com>
Cc: Tero Kristo <t-kristo@ti.com>
Cc: Paul Walmsley <paul@pwsan.com>
Signed-off-by: Keerthy <j-keerthy@ti.com>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
---
 arch/arm/boot/dts/dra7xx-clocks.dtsi |    1 +
 1 file changed, 1 insertion(+)

Comments

Tero Kristo June 19, 2014, 11:10 a.m. UTC | #1
On 05/29/2014 09:38 AM, Kishon Vijay Abraham I wrote:
> From: Keerthy <j-keerthy@ti.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.?

-Tero

>
> Cc: Rajendra Nayak <rnayak@ti.com>
> Cc: Tero Kristo <t-kristo@ti.com>
> Cc: Paul Walmsley <paul@pwsan.com>
> Signed-off-by: Keerthy <j-keerthy@ti.com>
> Signed-off-by: Kishon Vijay Abraham I <kishon@ti.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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Kishon Vijay Abraham I June 19, 2014, 12:45 p.m. UTC | #2
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@ti.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@ti.com>
>> Cc: Tero Kristo <t-kristo@ti.com>
>> Cc: Paul Walmsley <paul@pwsan.com>
>> Signed-off-by: Keerthy <j-keerthy@ti.com>
>> Signed-off-by: Kishon Vijay Abraham I <kishon@ti.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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Tero Kristo June 19, 2014, 1:27 p.m. UTC | #3
On 06/19/2014 03:45 PM, Kishon Vijay Abraham I wrote:
> 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@ti.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

Yes, something like this on the changelog would be good.

-Tero

> frequency.
>
> Thanks
> Kishon
>>
>> -Tero
>>
>>>
>>> Cc: Rajendra Nayak <rnayak@ti.com>
>>> Cc: Tero Kristo <t-kristo@ti.com>
>>> Cc: Paul Walmsley <paul@pwsan.com>
>>> Signed-off-by: Keerthy <j-keerthy@ti.com>
>>> Signed-off-by: Kishon Vijay Abraham I <kishon@ti.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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diff mbox

Patch

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>;
 	};