linux-kernel - Re: [PATCH] coresight: adding basic support for Spreadtrum SC9836

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Date:	Wed, 25 Mar 2015 20:19:36 +0800
From:	Chunyan Zhang <zhang.chunyan@...aro.org>
To:	Mathieu Poirier <mathieu.poirier@...aro.org>
Cc:	"arm@...nel.org" <arm@...nel.org>, Arnd Bergmann <arnd@...db.de>,
	Will Deacon <will.deacon@....com>,
	Mark Rutland <mark.rutland@....com>,
	Rob Herring <robh+dt@...nel.org>,
	Paweł Moll <pawel.moll@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Kaixu Xia <kaixu.xia@...aro.org>,
	Zhizhou <zhizhou.zhang@...eadtrum.com>,
	Orson Zhai <orsonzhai@...il.com>,
	Lyra Zhang <zhang.lyra@...il.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] coresight: adding basic support for Spreadtrum SC9836

On Tue, Mar 24, 2015 at 11:08 PM, Mathieu Poirier
<mathieu.poirier@...aro.org> wrote:
> On 23 March 2015 at 23:48, Chunyan Zhang <zhang.chunyan@...aro.org> wrote:
>> Support only for ETB, FUNNEL, STM are included currently.
>> Support for ETM, TPIU and the replicator linked to it are not included in
>> this version patch.
>>
>> Signed-off-by: Chunyan Zhang <zhang.chunyan@...aro.org>
>> ---
>>  arch/arm64/boot/dts/sprd/sc9836.dtsi | 57 ++++++++++++++++++++++++++++++++++++
>>  1 file changed, 57 insertions(+)
>>
>> diff --git a/arch/arm64/boot/dts/sprd/sc9836.dtsi b/arch/arm64/boot/dts/sprd/sc9836.dtsi
>> index f92f1b4..2ca80f3 100644
>> --- a/arch/arm64/boot/dts/sprd/sc9836.dtsi
>> +++ b/arch/arm64/boot/dts/sprd/sc9836.dtsi
>> @@ -45,6 +45,63 @@
>>                 };
>>         };
>>
>> +       etb@...03000 {
>> +               compatible = "arm,coresight-etb10", "arm,primecell";
>> +               reg = <0 0x10003000 0 0x1000>;
>> +               arm,primecell-periphid = <0x0003b907>;
>
> Specifying the primecell id in the device tree like this is usually to
> avoid probing of the memory space by the AMBA mechanic when bus
> components are discovered.  As such components are probed and
> initialised when their drivers are registered with the diver core
> later in the boot process.
>
> Is there a good reason why this is done here?  Especially when the
> funnel and STM don't specify their cell IDs in the DT.

Actually today I found that is not a ETB but TMC, so if I didn't set
peripheral id for it in DT, it can't be initialized as ETB.

I will correct it to be a TMC in upcoming version patch.

>
>> +               coresight-default-sink;
>
> Please remove the above - this feature no longer exists.

ok, I will remove it in next version.

>
>> +               clocks = <&clk26mhz>;
>> +               clock-names = "apb_pclk";
>> +               port {
>> +                       etb_in: endpoint {
>> +                               slave-mode;
>> +                               remote-endpoint = <&funnel_out_port0>;
>> +                       };
>> +               };
>> +       };
>> +
>> +       funnel@...01000 {
>> +               compatible = "arm,coresight-funnel", "arm,primecell";
>> +               reg = <0 0x10001000 0 0x1000>;
>> +               clocks = <&clk26mhz>;
>> +               clock-names = "apb_pclk";
>> +               ports {
>> +                       #address-cells = <1>;
>> +                       #size-cells = <0>;
>> +
>> +                       /* funnel output port */
>> +                       port@0 {
>> +                               reg = <0>;
>> +                               funnel_out_port0: endpoint {
>> +                                       remote-endpoint = <&etb_in>;
>> +                               };
>> +                       };
>> +
>> +                       /* funnel input port 0~3 is reserved for ETMs */
>> +                       port@1 {
>> +                               reg = <4>;
>> +                               funnel_in_port4: endpoint {
>> +                                       slave-mode;
>> +                                       remote-endpoint = <&stm_out>;
>> +                               };
>> +                       };
>> +               };
>> +       };
>> +
>> +       stm@...06000 {
>> +               compatible = "arm,coresight-stm", "arm,primecell";
>> +               reg = <0 0x10006000 0 0x1000>,
>> +                     <0 0x01000000 0 0x180000>;
>> +               reg-names = "stm-base", "stm-stimulus-base";
>> +               clocks = <&clk26mhz>;
>> +               clock-names = "apb_pclk";
>> +               port {
>> +                       stm_out: endpoint {
>> +                               remote-endpoint = <&funnel_in_port4>;
>> +                       };
>> +               };
>> +       };
>> +
>>         gic: interrupt-controller@...01000 {
>>                 compatible = "arm,gic-400";
>>                 reg = <0 0x12001000 0 0x1000>,
>> --
>> 1.9.1
>>
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