From: "Reddy, MallikarjunaX" <mallikarjunax.reddy@linux.intel.com>
To: Vinod Koul <vkoul@kernel.org>
Cc: Rob Herring <robh@kernel.org>,
dmaengine@vger.kernel.org, devicetree@vger.kernel.org,
linux-kernel@vger.kernel.org, andriy.shevchenko@intel.com,
cheol.yong.kim@intel.com, qi-ming.wu@intel.com,
chuanhua.lei@linux.intel.com, malliamireddy009@gmail.com
Subject: Re: [PATCH v5 1/2] dt-bindings: dma: Add bindings for intel LGM SOC
Date: Thu, 27 Aug 2020 17:54:28 +0800 [thread overview]
Message-ID: <ffa5ba4d-f1b2-6a30-f2f1-f4578a77bce2@linux.intel.com> (raw)
In-Reply-To: <20200825112107.GN2639@vkoul-mobl>
Hi Vinod,
Thanks for the review comments.
On 8/25/2020 7:21 PM, Vinod Koul wrote:
> On 18-08-20, 15:00, Reddy, MallikarjunaX wrote:
>
>>>> +
>>>> + intel,chans:
>>>> + $ref: /schemas/types.yaml#/definitions/uint32-array
>>>> + description:
>>>> + The channels included on this port. Format is channel start
>>>> + number and how many channels on this port.
>>> Why does this need to be in DT? This all seems like it can be in the dma
>>> cells for each client.
>> (*ABC)
>> Yes. We need this.
>> for dma0(lgm-cdma) old SOC supports 16 channels and the new SOC supports 22
>> channels. and the logical channel mapping for the peripherals also differ
>> b/w old and new SOCs.
>>
>> Because of this hardware limitation we are trying to configure the total
>> channels and port-channel mapping dynamically from device tree.
>>
>> based on port name we are trying to configure the default values for
>> different peripherals(ports).
>> Example: burst length is not same for all ports, so using port name to do
>> default configurations.
> Sorry that does not make sense to me, why not specify the values to be
> used here instead of defining your own name scheme!
OK. Agreed. I will remove port name from DT and only use intel,chans
>
> Only older soc it should create 16 channels and new 22 (hint this is hw
> description so perfectly okay to specify in DT or in using driver_data
> and compatible for each version
>
>>>> +
>>>> + required:
>>>> + - reg
>>>> + - intel,name
>>>> + - intel,chans
>>>> +
>>>> +
>>>> + ldma-channels:
>>>> + type: object
>>>> + description:
>>>> + This sub-node must contain a sub-node for each DMA channel.
>>>> + properties:
>>>> + '#address-cells':
>>>> + const: 1
>>>> + '#size-cells':
>>>> + const: 0
>>>> +
>>>> + patternProperties:
>>>> + "^ldma-channels@[0-15]+$":
>>>> + type: object
>>>> +
>>>> + properties:
>>>> + reg:
>>>> + items:
>>>> + - enum: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15]
>>>> + description:
>>>> + Which channel this node refers to.
>>>> +
>>>> + intel,desc_num:
>>>> + $ref: /schemas/types.yaml#/definitions/uint32
>>>> + description:
>>>> + Per channel maximum descriptor number. The max value is 255.
>>>> +
>>>> + intel,hdr-mode:
>>>> + $ref: /schemas/types.yaml#/definitions/uint32-array
>>>> + description:
>>>> + The first parameter is header mode size, the second
>>>> + parameter is checksum enable or disable. If enabled,
>>>> + header mode size is ignored. If disabled, header mode
>>>> + size must be provided.
>>>> +
>>>> + intel,hw-desc:
>>>> + $ref: /schemas/types.yaml#/definitions/uint32-array
>>>> + description:
>>>> + Per channel dma hardware descriptor configuration.
>>>> + The first parameter is descriptor physical address and the
>>>> + second parameter hardware descriptor number.
>>> Again, this all seems like per client information for dma cells.
>> Ok, if we move all these attributes to 'dmas' then 'dma-channels' child
>> node is not needed in dtsi.
>> #dma-cells number i am already using 7. If we move all these attributes to
>> 'dmas' then integer cells will increase.
>>
>> Is there any limitation in using a number of integer cells & as determined
>> by the #dma-cells property?
> No I dont think there is but it needs to make sense :-)
OK.
>
next prev parent reply other threads:[~2020-08-27 9:54 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-14 5:26 [PATCH v5 0/2] Add Intel LGM soc DMA support Amireddy Mallikarjuna reddy
2020-08-14 5:26 ` [PATCH v5 1/2] dt-bindings: dma: Add bindings for intel LGM SOC Amireddy Mallikarjuna reddy
2020-08-14 20:32 ` Rob Herring
2020-08-18 7:00 ` Reddy, MallikarjunaX
2020-08-25 11:21 ` Vinod Koul
2020-08-27 9:54 ` Reddy, MallikarjunaX [this message]
2020-08-28 10:45 ` Vinod Koul
2020-08-31 8:06 ` Reddy, MallikarjunaX
2020-08-31 11:00 ` Vinod Koul
2020-09-01 15:03 ` Reddy, MallikarjunaX
2020-09-04 6:31 ` Peter Ujfalusi
2020-09-07 7:25 ` Reddy, MallikarjunaX
2020-08-14 5:26 ` [PATCH v5 2/2] Add Intel LGM soc DMA support Amireddy Mallikarjuna reddy
2020-08-14 8:47 ` kernel test robot
2020-08-18 10:16 ` Peter Ujfalusi
2020-08-18 10:29 ` Peter Ujfalusi
2020-08-24 2:30 ` Reddy, MallikarjunaX
2020-08-24 11:24 ` Peter Ujfalusi
2020-08-27 14:41 ` Reddy, MallikarjunaX
2020-08-28 11:17 ` Peter Ujfalusi
2020-08-31 8:07 ` Reddy, MallikarjunaX
2020-09-04 6:31 ` Peter Ujfalusi
2020-09-07 7:32 ` Reddy, MallikarjunaX
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