linux-kernel - Re: [PATCH V3 01/10] Documentation: DT: qcom

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Date:   Fri, 23 Sep 2016 14:58:32 -0400
From:   Sinan Kaya <okaya@...eaurora.org>
To:     Mark Rutland <mark.rutland@....com>
Cc:     dmaengine@...r.kernel.org, timur@...eaurora.org,
        devicetree@...r.kernel.org, cov@...eaurora.org,
        vinod.koul@...el.com, jcm@...hat.com, agross@...eaurora.org,
        arnd@...db.de, linux-arm-msm@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        Rob Herring <robh+dt@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V3 01/10] Documentation: DT: qcom_hidma: update binding
 for MSI

On 9/23/2016 2:02 PM, Mark Rutland wrote:
> On Thu, Sep 15, 2016 at 01:22:37PM -0400, Sinan Kaya wrote:
>> Adding a new binding for qcom,hidma-1.1 to distinguish HW supporting
>> MSI interrupts from the older revision.
>>
>> Signed-off-by: Sinan Kaya <okaya@...eaurora.org>
>> ---
>>  Documentation/devicetree/bindings/dma/qcom_hidma_mgmt.txt | 13 ++++++++++++-
>>  1 file changed, 12 insertions(+), 1 deletion(-)
>>
>> diff --git a/Documentation/devicetree/bindings/dma/qcom_hidma_mgmt.txt b/Documentation/devicetree/bindings/dma/qcom_hidma_mgmt.txt
>> index fd5618b..47bfb5a 100644
>> --- a/Documentation/devicetree/bindings/dma/qcom_hidma_mgmt.txt
>> +++ b/Documentation/devicetree/bindings/dma/qcom_hidma_mgmt.txt
>> @@ -47,12 +47,23 @@ When the OS is not in control of the management interface (i.e. it's a guest),
>>  the channel nodes appear on their own, not under a management node.
>>  
>>  Required properties:
>> -- compatible: must contain "qcom,hidma-1.0"
>> +- compatible: must contain "qcom,hidma-1.0" for initial HW or "qcom,hidma-1.1"
>> +for MSI capable HW.
>>  - reg: Addresses for the transfer and event channel
>>  - interrupts: Should contain the event interrupt
>>  - desc-count: Number of asynchronous requests this channel can handle
>>  - iommus: required a iommu node
>>  
>> +Optional properties for MSI:
>> +- msi-parent: pointer to the MSI controller object with the DeviceID in use.
> 
> The format of msi-cells depends on the particular msi-controller, so no
> need to mention DeviceID here.
> 
> Please refer to
> Documentation/devicetree/bindings/interrupt-controller/msi.txt

Thanks, let me do some more research.

> 
>> +Example:
>> + msi_parent: <&msi0 0x80024>
> 
> This doesn't match (s/_/-/).

ok

> 
>> +msi0 is the MSI controller in the system. Bits 0-5 is the channel ID. 4
>> +is the channel ID. Bits 5-8 is the instance number. This is for the HIDMA
>> +instance 1.
> 
> I don't think you need any of this text, so long as you refer to the
> generic MSI binding document, as above.

ok

> 
> Thanks,
> Mark.
> 


-- 
Sinan Kaya
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project.