[PATCH v2 12/25] dt-bindings: qcom_nandc: QPIC NAND documentation

Abhishek Sahu absahu at codeaurora.org
Tue Jul 25 11:43:03 PDT 2017


On 2017-07-25 00:47, Rob Herring wrote:
> On Wed, Jul 19, 2017 at 05:18:00PM +0530, Abhishek Sahu wrote:
>> 1. QPIC NAND will use compatible string "qcom,qpic-nandc-v1.4.0"
>> 2. QPIC NAND will 3 BAM channels: command, data tx and data rx
>>    while EBI2 NAND uses only single ADM channel.
>> 3. CRCI is only required for ADM DMA and its not required for
>>    QPIC NAND.
>> 
>> Signed-off-by: Abhishek Sahu <absahu at codeaurora.org>
>> ---
>>  .../devicetree/bindings/mtd/qcom_nandc.txt         | 54 
>> ++++++++++++++++++++--
>>  1 file changed, 51 insertions(+), 3 deletions(-)
>> 
>> diff --git a/Documentation/devicetree/bindings/mtd/qcom_nandc.txt 
>> b/Documentation/devicetree/bindings/mtd/qcom_nandc.txt
>> index b24adfe..8efaeb0 100644
>> --- a/Documentation/devicetree/bindings/mtd/qcom_nandc.txt
>> +++ b/Documentation/devicetree/bindings/mtd/qcom_nandc.txt
>> @@ -1,13 +1,15 @@
>>  * Qualcomm NAND controller
>> 
>>  Required properties:
>> -- compatible:		should be "qcom,ebi2-nandc" - EBI2 NAND which uses ADM
>> -			DMA like IPQ8064.
>> -
>> +- compatible:		must be one of the following:
>> +	* "qcom,ebi2-nandc" - EBI2 NAND which uses ADM DMA like IPQ8064.
>> +	* "qcom,qpic-nandc-v1.4.0" - QPIC NAND v1.4.0 which uses BAM DMA 
>> like IPQ4019.
> 
> Looks like you have 2 SoCs and 2 versions of h/w. Use SoC specific
> compatible strings.

  We have 3 versions of NAND HW currently.
  EBI2,
  QPIC version 1.4.0
  QPIC version 1.5.0

  and multiple Qualcomm SoCs which use any one of these.

  The original plan was to have compatible string for NAND version since
  same NAND hardware is being in different SoC and SoC dtsi will simply
  use its NAND version compatible string like other Qualcomm hardwares

  
http://elixir.free-electrons.com/linux/latest/source/Documentation/devicetree/bindings/dma/qcom_bam_dma.txt
  
http://elixir.free-electrons.com/linux/latest/source/Documentation/devicetree/bindings/spi/qcom,spi-qup.txt

> 
> Rob

-- 
Abhishek Sahu



More information about the linux-mtd mailing list