linux-kernel - Re: [PATCH v2 1/3] ARM: dts: berlin2q: add the Marvell Armada 1500 pro

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Message-ID: <5322D089.7010605@free-electrons.com>
Date:	Fri, 14 Mar 2014 10:48:57 +0100
From:	Antoine Ténart 
	<antoine.tenart@...e-electrons.com>
To:	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
CC:	alexandre.belloni@...e-electrons.com, zmxu@...vell.com,
	jszhang@...vell.com, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/3] ARM: dts: berlin2q: add the Marvell Armada 1500
 pro

Sebastian,

On 14/03/2014 10:31, Sebastian Hesselbarth wrote:
> On 03/13/2014 03:06 PM, Antoine Ténart wrote:
>> +    clocks {
>> +        #address-cells = <0>;
>> +        #size-cells = <0>;
>> +
>> +        smclk: sysmgr-clock {
>> +            compatible = "fixed-clock";
>> +            #clock-cells = <0>;
>> +            clock-frequency = <25000000>;
>> +        };
>> +
>> +        sysclk: system-clock {
>> +            compatible = "fixed-clock";
>> +            #clock-cells = <0>;
>> +            clock-frequency = <400000000>;
>> +        };
>> +    };
>> +
>> +    soc {
> [...]
>> +        local-timer@...600 {
>> +            compatible = "arm,cortex-a9-twd-timer";
>> +            reg = <0xad0600 0x20>;
>> +            clocks = <&sysclk>;
>
> If I understand Jisheng correctly, this should be cpuclk/3. When
> removing the clocks {} container above, please also take care of
> it.
>
> You can do
>
> cpuclk: cpu-clock {
>      compatible = "fixed-clock";
>      #clock-cells = <0>;
>      clock-frequency = <1200000000>; /* <- put correct freq here */
> };
>
> sysclk: system-clock {
>      compatible = "fixed-factor-clock";
>      #clock-cells = <0>;
>      clocks = <&cpuclk>;
>      clock-multi = <1>;
>      clock-div = <3>;
> };
>
> Hopefully, we'll have proper clock drivers soon so we can just replace
> referenced "fixed-*" clocks.

Sure, this is why I only kept one fixed clock in this patch.

I'll add the cpuclk here then.

>> +            timer0: timer@...0 {
>> +                compatible = "snps,dw-apb-timer";
>> +                reg = <0x2c00 0x14>;
>> +                interrupts = <8>;
>> +                clock-freq = <100000000>;
>> +                status = "okay";
>> +            };
>> +
>> +            timer1: timer@...4 {
>> +                compatible = "snps,dw-apb-timer";
>> +                reg = <0x2c14 0x14>;
>> +                clock-freq = <100000000>;
>> +                status = "disabled";
>> +            };
>
> Please also add the remaining 6 apb timers.

I don't have any information about the remaining 6 apb timers. I'll ask 
Jisheng.


Antoine

-- 
Antoine Ténart, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com
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