Re: [PATCH v2 2/8] [PATCH 2/8] Documentations: dt-bindings: Add a document of PECI adapter driver for Aspeed AST24xx/25xx SoCs

[Jae Hyun Yoo]

Hi Milton,

Thanks for sharing your time to review this patch. Please see my answer 
inline.


Jae

On 3/9/2018 3:41 PM, Milton Miller II wrote:

About  03/07/2018 04:12PM in some time zone, Pavel Machek wrote:

Subject: Re: [PATCH v2 2/8] [PATCH 2/8] Documentations: dt-bindings:
Add a document of PECI adapter driver for Aspeed AST24xx/25xx SoCs

Hi!


Are these SoCs x86-based?


Yes, these are ARM SoCs. Please see Andrew's answer as well.


Understood, thanks.


+   Read sampling point selection. The whole period of a bit time

will be

+   divided into 16 time frames. This value will determine which

time frame

+   this controller will sample PECI signal for data read back.

Usually in

+   the middle of a bit time is the best.


English? "This value will determine when this controller"?



Could I change it like below?:

"This value will determine in which time frame this controller

samples PECI

signal for data read back"


I guess... I'm not native speaker, I guess this could be improved
some
more.



I agree this wording is still confusing.

The problem is that the key subject, the time of the sampling, is in the descriptive 
clause "in which time frame".

"This value will determine the time frame in which the controller will sample"

or perhaps phrase it as saving a specific sample from the over-clock, or a 
phase of the clock.



Yes, that looks more better. I'll change the wording as you suggested. 
Thanks a lot!


Jae


Best regards,
Pavel

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milton
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Re: [PATCH v2 2/8] [PATCH 2/8] Documentations: dt-bindings: Add a document of PECI adapter driver for Aspeed AST24xx/25xx SoCs

[Milton Miller II]

About  03/07/2018 04:12PM in some time zone, Pavel Machek wrote:
>Subject: Re: [PATCH v2 2/8] [PATCH 2/8] Documentations: dt-bindings:
>Add a document of PECI adapter driver for Aspeed AST24xx/25xx SoCs
>
>Hi!
>
>> >Are these SoCs x86-based?
>> 
>> Yes, these are ARM SoCs. Please see Andrew's answer as well.
>
>Understood, thanks.
>
>> >>+  Read sampling point selection. The whole period of a bit time
>will be
>> >>+  divided into 16 time frames. This value will determine which
>time frame
>> >>+  this controller will sample PECI signal for data read back.
>Usually in
>> >>+  the middle of a bit time is the best.
>> >
>> >English? "This value will determine when this controller"?
>> >
>> 
>> Could I change it like below?:
>> 
>> "This value will determine in which time frame this controller
>samples PECI
>> signal for data read back"
>
>I guess... I'm not native speaker, I guess this could be improved
>some
>more.
>

I agree this wording is still confusing. 

The problem is that the key subject, the time of the sampling, is in the 
descriptive clause "in which time frame".

"This value will determine the time frame in which the controller will sample"

or perhaps phrase it as saving a specific sample from the over-clock, or a 
phase of the clock.

>Best regards,
>   Pavel
>
>-- 
>(english) http://www.livejournal.com/~pavelmachek
>(cesky, pictures)
>http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
>

milton
--
Speaking for myself not IBM.

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Re: [PATCH v2 2/8] [PATCH 2/8] Documentations: dt-bindings: Add a document of PECI adapter driver for Aspeed AST24xx/25xx SoCs

[Pavel Machek]

Hi!

> >Are these SoCs x86-based?
> 
> Yes, these are ARM SoCs. Please see Andrew's answer as well.

Understood, thanks.

> >>+   Read sampling point selection. The whole period of a bit time will be
> >>+   divided into 16 time frames. This value will determine which time frame
> >>+   this controller will sample PECI signal for data read back. Usually in
> >>+   the middle of a bit time is the best.
> >
> >English? "This value will determine when this controller"?
> >
> 
> Could I change it like below?:
> 
> "This value will determine in which time frame this controller samples PECI
> signal for data read back"

I guess... I'm not native speaker, I guess this could be improved some
more.

Best regards,
Pavel

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) 
http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html


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Re: [PATCH v2 2/8] [PATCH 2/8] Documentations: dt-bindings: Add a document of PECI adapter driver for Aspeed AST24xx/25xx SoCs

[Jae Hyun Yoo]

Hi Pavel,

Thanks for sharing your time on reviewing it. Please see my answers inline.

-Jae

On 3/6/2018 4:40 AM, Pavel Machek wrote:

Hi!


Signed-off-by: Jae Hyun Yoo 
---
  .../devicetree/bindings/peci/peci-aspeed.txt   | 73 ++
  1 file changed, 73 insertions(+)
  create mode 100644 Documentation/devicetree/bindings/peci/peci-aspeed.txt

diff --git a/Documentation/devicetree/bindings/peci/peci-aspeed.txt 
b/Documentation/devicetree/bindings/peci/peci-aspeed.txt
new file mode 100644
index ..8a86f346d550
--- /dev/null
+++ b/Documentation/devicetree/bindings/peci/peci-aspeed.txt
@@ -0,0 +1,73 @@
+Device tree configuration for PECI buses on the AST24XX and AST25XX SoCs.


Are these SoCs x86-based?



Yes, these are ARM SoCs. Please see Andrew's answer as well.


+Required properties:
+- compatible
+   "aspeed,ast2400-peci" or "aspeed,ast2500-peci"
+   - aspeed,ast2400-peci: Aspeed AST2400 family PECI controller
+   - aspeed,ast2500-peci: Aspeed AST2500 family PECI controller
+
+- reg
+   Should contain PECI registers location and length.


Other dts documents put it on one line, reg: Should contain ...


+- clock_frequency
+   Should contain the operation frequency of PECI hardware module.
+   187500 ~ 2400


specify this is Hz?



I'll add a description. Thanks!


+- rd-sampling-point
+   Read sampling point selection. The whole period of a bit time will be
+   divided into 16 time frames. This value will determine which time frame
+   this controller will sample PECI signal for data read back. Usually in
+   the middle of a bit time is the best.


English? "This value will determine when this controller"?



Could I change it like below?:

"This value will determine in which time frame this controller samples 
PECI signal for data read back"



+   0 ~ 15 (default: 8)
+
+- cmd_timeout_ms
+   Command timeout in units of ms.
+   1 ~ 6 (default: 1000)
+
+Example:
+   peci: peci@1e78b000 {
+   compatible = "simple-bus";
+   #address-cells = <1>;
+   #size-cells = <1>;
+   ranges = <0x0 0x1e78b000 0x60>;
+
+   peci0: peci-bus@0 {
+   compatible = "aspeed,ast2500-peci";
+   reg = <0x0 0x60>;
+   #address-cells = <1>;
+   #size-cells = <0>;
+   interrupts = <15>;
+   clocks = <_clkin>;
+   clock-frequency = <2400>;
+   msg-timing-nego = <1>;
+   addr-timing-nego = <1>;
+   rd-sampling-point = <8>;
+   cmd-timeout-ms = <1000>;
+   };
+   };
\ No newline at end of file



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Re: [PATCH v2 2/8] [PATCH 2/8] Documentations: dt-bindings: Add a document of PECI adapter driver for Aspeed AST24xx/25xx SoCs

[Arnd Bergmann]

On Tue, Mar 6, 2018 at 2:05 PM, Pavel Machek  wrote:
> On Tue 2018-03-06 13:54:16, Andrew Lunn wrote:
>> On Tue, Mar 06, 2018 at 01:40:02PM +0100, Pavel Machek wrote:
>> > Hi!
>> >
>> > > Signed-off-by: Jae Hyun Yoo 
>> > > ---
>> > >  .../devicetree/bindings/peci/peci-aspeed.txt   | 73 
>> > > ++
>> > >  1 file changed, 73 insertions(+)
>> > >  create mode 100644 
>> > > Documentation/devicetree/bindings/peci/peci-aspeed.txt
>> > >
>> > > diff --git a/Documentation/devicetree/bindings/peci/peci-aspeed.txt 
>> > > b/Documentation/devicetree/bindings/peci/peci-aspeed.txt
>> > > new file mode 100644
>> > > index ..8a86f346d550
>> > > --- /dev/null
>> > > +++ b/Documentation/devicetree/bindings/peci/peci-aspeed.txt
>> > > @@ -0,0 +1,73 @@
>> > > +Device tree configuration for PECI buses on the AST24XX and AST25XX 
>> > > SoCs.
>> >
>> > Are these SoCs x86-based?
>>
>> ARM, as far as i can tell. If i get the architecture correct, these
>> are BMC, Board Management Controllers, looking after the main x86 CPU,
>> stopping it overheating, controlling the power supplies, remote
>> management, etc.
>
> Ok, so with x86 machine, I get arm-based one for free. I get it. Is
> user able to run his own kernel on the arm system, or is it locked
> down, TiVo style?

In the past, they were all locked down, the team submitting those
patches in working on changing that. Have a look for OpenBMC.

   Arnd
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Re: [PATCH v2 2/8] [PATCH 2/8] Documentations: dt-bindings: Add a document of PECI adapter driver for Aspeed AST24xx/25xx SoCs

[Pavel Machek]

On Tue 2018-03-06 13:54:16, Andrew Lunn wrote:
> On Tue, Mar 06, 2018 at 01:40:02PM +0100, Pavel Machek wrote:
> > Hi!
> > 
> > > Signed-off-by: Jae Hyun Yoo 
> > > ---
> > >  .../devicetree/bindings/peci/peci-aspeed.txt   | 73 
> > > ++
> > >  1 file changed, 73 insertions(+)
> > >  create mode 100644 Documentation/devicetree/bindings/peci/peci-aspeed.txt
> > > 
> > > diff --git a/Documentation/devicetree/bindings/peci/peci-aspeed.txt 
> > > b/Documentation/devicetree/bindings/peci/peci-aspeed.txt
> > > new file mode 100644
> > > index ..8a86f346d550
> > > --- /dev/null
> > > +++ b/Documentation/devicetree/bindings/peci/peci-aspeed.txt
> > > @@ -0,0 +1,73 @@
> > > +Device tree configuration for PECI buses on the AST24XX and AST25XX SoCs.
> > 
> > Are these SoCs x86-based?
> 
> ARM, as far as i can tell. If i get the architecture correct, these
> are BMC, Board Management Controllers, looking after the main x86 CPU,
> stopping it overheating, controlling the power supplies, remote
> management, etc.

Ok, so with x86 machine, I get arm-based one for free. I get it. Is
user able to run his own kernel on the arm system, or is it locked
down, TiVo style?

Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) 
http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html


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Re: [PATCH v2 2/8] [PATCH 2/8] Documentations: dt-bindings: Add a document of PECI adapter driver for Aspeed AST24xx/25xx SoCs

[Pavel Machek]

Hi!

> Signed-off-by: Jae Hyun Yoo 
> ---
>  .../devicetree/bindings/peci/peci-aspeed.txt   | 73 
> ++
>  1 file changed, 73 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/peci/peci-aspeed.txt
> 
> diff --git a/Documentation/devicetree/bindings/peci/peci-aspeed.txt 
> b/Documentation/devicetree/bindings/peci/peci-aspeed.txt
> new file mode 100644
> index ..8a86f346d550
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/peci/peci-aspeed.txt
> @@ -0,0 +1,73 @@
> +Device tree configuration for PECI buses on the AST24XX and AST25XX SoCs.

Are these SoCs x86-based?

> +Required properties:
> +- compatible
> + "aspeed,ast2400-peci" or "aspeed,ast2500-peci"
> + - aspeed,ast2400-peci: Aspeed AST2400 family PECI controller
> + - aspeed,ast2500-peci: Aspeed AST2500 family PECI controller
> +
> +- reg
> + Should contain PECI registers location and length.

Other dts documents put it on one line, reg: Should contain ...

> +- clock_frequency
> + Should contain the operation frequency of PECI hardware module.
> + 187500 ~ 2400

specify this is Hz?

> +- rd-sampling-point
> + Read sampling point selection. The whole period of a bit time will be
> + divided into 16 time frames. This value will determine which time frame
> + this controller will sample PECI signal for data read back. Usually in
> + the middle of a bit time is the best.

English? "This value will determine when this controller"?

> + 0 ~ 15 (default: 8)
> +
> +- cmd_timeout_ms
> + Command timeout in units of ms.
> + 1 ~ 6 (default: 1000)
> +
> +Example:
> + peci: peci@1e78b000 {
> + compatible = "simple-bus";
> + #address-cells = <1>;
> + #size-cells = <1>;
> + ranges = <0x0 0x1e78b000 0x60>;
> +
> + peci0: peci-bus@0 {
> + compatible = "aspeed,ast2500-peci";
> + reg = <0x0 0x60>;
> + #address-cells = <1>;
> + #size-cells = <0>;
> + interrupts = <15>;
> + clocks = <_clkin>;
> + clock-frequency = <2400>;
> + msg-timing-nego = <1>;
> + addr-timing-nego = <1>;
> + rd-sampling-point = <8>;
> + cmd-timeout-ms = <1000>;
> + };
> + };
> \ No newline at end of file

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Re: [PATCH v2 2/8] [PATCH 2/8] Documentations: dt-bindings: Add a document of PECI adapter driver for Aspeed AST24xx/25xx SoCs

[Jae Hyun Yoo]

On 2/21/2018 9:13 AM, Andrew Lunn wrote:

On Wed, Feb 21, 2018 at 08:16:00AM -0800, Jae Hyun Yoo wrote:

This commit adds a dt-bindings document of PECI adapter driver for Aspeed
AST24xx/25xx SoCs.


Hi Jae

It would be good to separate this into two. One binding document for a
generic adaptor, with a generic PECI bus, and generic client
devices. List all the properties you expect at the generic level.

Then have an aspeed specific binding for those properties which are
specific to the Aspeed adaptor.



That makes sense. I'll add generic PECI bus/adapter/client and Aspeed 
specific documents as separated.



 Andrew
  



Thanks again for sharing your time to review it. I really appreciate it.

BR,
Jae
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Re: [PATCH v2 2/8] [PATCH 2/8] Documentations: dt-bindings: Add a document of PECI adapter driver for Aspeed AST24xx/25xx SoCs

[Andrew Lunn]

On Wed, Feb 21, 2018 at 08:16:00AM -0800, Jae Hyun Yoo wrote:
> This commit adds a dt-bindings document of PECI adapter driver for Aspeed
> AST24xx/25xx SoCs.

Hi Jae

It would be good to separate this into two. One binding document for a
generic adaptor, with a generic PECI bus, and generic client
devices. List all the properties you expect at the generic level.

Then have an aspeed specific binding for those properties which are
specific to the Aspeed adaptor.

 Andrew
 
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[PATCH v2 2/8] [PATCH 2/8] Documentations: dt-bindings: Add a document of PECI adapter driver for Aspeed AST24xx/25xx SoCs

[Jae Hyun Yoo]

This commit adds a dt-bindings document of PECI adapter driver for Aspeed
AST24xx/25xx SoCs.

Signed-off-by: Jae Hyun Yoo 
---
 .../devicetree/bindings/peci/peci-aspeed.txt   | 73 ++
 1 file changed, 73 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/peci/peci-aspeed.txt

diff --git a/Documentation/devicetree/bindings/peci/peci-aspeed.txt 
b/Documentation/devicetree/bindings/peci/peci-aspeed.txt
new file mode 100644
index ..8a86f346d550
--- /dev/null
+++ b/Documentation/devicetree/bindings/peci/peci-aspeed.txt
@@ -0,0 +1,73 @@
+Device tree configuration for PECI buses on the AST24XX and AST25XX SoCs.
+
+Required properties:
+- compatible
+   "aspeed,ast2400-peci" or "aspeed,ast2500-peci"
+   - aspeed,ast2400-peci: Aspeed AST2400 family PECI controller
+   - aspeed,ast2500-peci: Aspeed AST2500 family PECI controller
+
+- reg
+   Should contain PECI registers location and length.
+
+- #address-cells
+   Should be <1>.
+
+- #size-cells
+   Should be <0>.
+
+- interrupts
+   Should contain PECI interrupt.
+
+- clocks
+   Should contain clock source for PECI hardware module. Should reference
+   clkin clock.
+
+- clock_frequency
+   Should contain the operation frequency of PECI hardware module.
+   187500 ~ 2400
+
+Optional properties:
+- msg-timing-nego
+   Message timing negotiation period. This value will determine the period
+   of message timing negotiation to be issued by PECI controller. The unit
+   of the programmed value is four times of PECI clock period.
+   0 ~ 255 (default: 1)
+
+- addr-timing-nego
+   Address timing negotiation period. This value will determine the period
+   of address timing negotiation to be issued by PECI controller. The unit
+   of the programmed value is four times of PECI clock period.
+   0 ~ 255 (default: 1)
+
+- rd-sampling-point
+   Read sampling point selection. The whole period of a bit time will be
+   divided into 16 time frames. This value will determine which time frame
+   this controller will sample PECI signal for data read back. Usually in
+   the middle of a bit time is the best.
+   0 ~ 15 (default: 8)
+
+- cmd_timeout_ms
+   Command timeout in units of ms.
+   1 ~ 6 (default: 1000)
+
+Example:
+   peci: peci@1e78b000 {
+   compatible = "simple-bus";
+   #address-cells = <1>;
+   #size-cells = <1>;
+   ranges = <0x0 0x1e78b000 0x60>;
+
+   peci0: peci-bus@0 {
+   compatible = "aspeed,ast2500-peci";
+   reg = <0x0 0x60>;
+   #address-cells = <1>;
+   #size-cells = <0>;
+   interrupts = <15>;
+   clocks = <_clkin>;
+   clock-frequency = <2400>;
+   msg-timing-nego = <1>;
+   addr-timing-nego = <1>;
+   rd-sampling-point = <8>;
+   cmd-timeout-ms = <1000>;
+   };
+   };
\ No newline at end of file
-- 
2.16.1

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