linux-kernel - Re: [PATCH linux-next v6 04/13] dt-bindings: Add a document of PECI adapter driver for ASPEED AST24xx/25xx SoCs

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Date:   Tue, 3 Jul 2018 10:01:50 -0700
From:   Jae Hyun Yoo <jae.hyun.yoo@...ux.intel.com>
To:     Rob Herring <robh@...nel.org>
Cc:     Jason M Biils <jason.m.bills@...ux.intel.com>,
        Mark Rutland <mark.rutland@....com>,
        Joel Stanley <joel@....id.au>,
        Andrew Jeffery <andrew@...id.au>, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-aspeed@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        openbmc@...ts.ozlabs.org,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Greg KH <gregkh@...uxfoundation.org>,
        Milton Miller II <miltonm@...ibm.com>,
        Pavel Machek <pavel@....cz>,
        Robin Murphy <robin.murphy@....com>,
        Ryan Chen <ryan_chen@...eedtech.com>
Subject: Re: [PATCH linux-next v6 04/13] dt-bindings: Add a document of PECI
 adapter driver for ASPEED AST24xx/25xx SoCs

Hi Rob,

Thanks a lot for the review. Please check my inline answer.

On 7/3/2018 9:51 AM, Rob Herring wrote:
> On Thu, Jun 21, 2018 at 12:40:24PM -0700, Jae Hyun Yoo wrote:
>> This commit adds a dt-bindings document of PECI adapter driver for ASPEED
>> AST24xx/25xx SoCs.
>>
>> Signed-off-by: Jae Hyun Yoo <jae.hyun.yoo@...ux.intel.com>
>> Reviewed-by: Haiyue Wang <haiyue.wang@...ux.intel.com>
>> Reviewed-by: James Feist <james.feist@...ux.intel.com>
>> Reviewed-by: Vernon Mauery <vernon.mauery@...ux.intel.com>
>> Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
>> Cc: Greg KH <gregkh@...uxfoundation.org>
>> Cc: Jason M Biils <jason.m.bills@...ux.intel.com>
>> Cc: Milton Miller II <miltonm@...ibm.com>
>> Cc: Pavel Machek <pavel@....cz>
>> Cc: Robin Murphy <robin.murphy@....com>
>> Cc: Ryan Chen <ryan_chen@...eedtech.com>
>> ---
>>   .../devicetree/bindings/peci/peci-aspeed.txt  | 57 +++++++++++++++++++
>>   1 file changed, 57 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 000000000000..8c35f905589d
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/peci/peci-aspeed.txt
>> @@ -0,0 +1,57 @@
>> +Device tree configuration for PECI buses on the AST24XX and AST25XX SoCs.
>> +
>> +Required properties:
>> +- compatible        : Should be "aspeed,ast2400-peci" or "aspeed,ast2500-peci"
>> +		      - aspeed,ast2400-peci: ASPEED AST2400 family PECI
>> +					     controller
>> +		      - aspeed,ast2500-peci: ASPEED AST2500 family PECI
>> +					     controller
> 
> Just this is sufficient:
> 
> Should be one of:
> 	"aspeed,ast2400-peci"
> 	"aspeed,ast2500-peci"
> 
> With that,
> 
> Reviewed-by: Rob Herring <robh@...nel.org>
> 

Thanks! I'll change it as you commented out.

Jae

>> +- reg               : Should contain PECI controller registers location and
>> +		      length.
>> +- #address-cells    : Should be <1> required to define a client address.
>> +- #size-cells       : Should be <0> required to define a client address.
>> +- interrupts        : Should contain PECI controller interrupt.
>> +- clocks            : Should contain clock source for PECI controller. Should
>> +		      reference the external oscillator clock in the second
>> +		      cell.
>> +- resets            : Should contain phandle to reset controller with the reset
>> +		      number in the second cell.
>> +- clock-frequency   : Should contain the operation frequency of PECI controller
>> +		      in units of Hz.
>> +		      187500 ~ 24000000
>> +
>> +Optional properties:
>> +- msg-timing        : 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       : 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 the time frame in which the 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 ~ 60000 (default: 1000)
>> +
>> +Example:
>> +	peci0: peci-bus@0 {
>> +		compatible = "aspeed,ast2500-peci";
>> +		reg = <0x0 0x60>;
>> +		#address-cells = <1>;
>> +		#size-cells = <0>;
>> +		interrupts = <15>;
>> +		clocks = <&syscon ASPEED_CLK_GATE_REFCLK>;
>> +		resets = <&syscon ASPEED_RESET_PECI>;
>> +		clock-frequency = <24000000>;
>> +		msg-timing = <1>;
>> +		addr-timing = <1>;
>> +		rd-sampling-point = <8>;
>> +		cmd-timeout-ms = <1000>;
>> +	};
>> -- 
>> 2.17.1
>>