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SubjectRe: [PATCH v12 1/4] dt-bindings: spi: Add schema for Cadence QSPI Controller driver
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Hi,

On 20/3/2020 2:05 pm, Vignesh Raghavendra wrote:
>
> On 10/03/20 7:22 am, Ramuthevar,Vadivel MuruganX wrote:
>> From: Ramuthevar Vadivel Murugan <vadivel.muruganx.ramuthevar@linux.intel.com>
>>
>> Add dt-bindings documentation for Cadence-QSPI controller to support
>> spi based flash memories.
>>
>> Signed-off-by: Ramuthevar Vadivel Murugan <vadivel.muruganx.ramuthevar@linux.intel.com>
>> ---
>> .../devicetree/bindings/mtd/cadence-quadspi.txt | 67 -----------
>> .../devicetree/bindings/spi/cdns,qspi-nor.yaml | 127 +++++++++++++++++++++
>> 2 files changed, 127 insertions(+), 67 deletions(-)
>> delete mode 100644 Documentation/devicetree/bindings/mtd/cadence-quadspi.txt
>> create mode 100644 Documentation/devicetree/bindings/spi/cdns,qspi-nor.yaml
>>
> [...]
>
>> +
>> +# subnode's properties
>> +patternProperties:
>> + "^.*@[0-9a-fA-F]+$":
>> + type: object
>> + description:
>> + flash device uses the subnodes below defined properties.
>> +
>> + cdns,read-delay:
>> + $ref: /schemas/types.yaml#/definitions/uint32
>> + description:
>> + Delay in 4 microseconds, read capture logic, in clock cycles.
>
> Not its not... See the old binding description please:
>
> -- cdns,read-delay : Delay for read capture logic, in clock cycles
>
> There is no mention of 4us. Range is 0x0 - 0xF
Sure, will update as you have suggested.
>> +
>> + cdns,tshsl-ns:
>> + description: |
>> + Delay in 50 nanoseconds, for the length that the master mode chip select
>> + outputs are de-asserted between transactions.
> Again see the description in old binding file:
>
> cdns,tshsl-ns : Delay in nanoseconds for the length that the master
> mode chip select outputs are de-asserted between
> transactions.
>
> Need not be 50ns or its multiple
Sure, will update as you have suggested.
>> +
>> + cdns,tsd2d-ns:
>> + description: |
>> + Delay in 50 nanoseconds, between one chip select being de-activated
>> + and the activation of another.
>> +
> same here
>
>> + cdns,tchsh-ns:
>> + description: |
>> + Delay in 4 nanoseconds, between last bit of current transaction and
>> + deasserting the device chip select (qspi_n_ss_out).
>> +
> Same here... Need not be 4ns...
>
>> + cdns,tslch-ns:
>> + description: |
>> + Delay in 4 nanoseconds, between setting qspi_n_ss_out low and
>> + first bit transfer.
>
> Same here...
>
> Above four values ( cdns,*-ns) come directly from the flash datasheets.
>
> These values are converted appropriate number of cycles depending upon
> the QSPI ref_clk frequency. So, there is no easy way to express the
> constraint (or range) in DT schema. I would recommend to just stick with
> the description that is there in the old binding file without any
> modifications.

Noted, will update.

Regards
Vadivel
>
> Regards
> Vignesh

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