linux-kernel - Re: [PATCH 1/7] mtd: spi-nor: cadence-quadspi: add a delay in write sequence

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Message-ID: <f756daf8-7880-2c0e-f182-1748b65e5c79@ti.com>
Date:   Thu, 10 Aug 2017 10:58:13 +0530
From:   Vignesh R <vigneshr@...com>
To:     Rob Herring <robh@...nel.org>
CC:     Marek Vasut <marek.vasut@...il.com>,
        Cyrille Pitchen <cyrille.pitchen@...ev4u.fr>,
        Santosh Shilimkar <ssantosh@...nel.org>,
        David Woodhouse <dwmw2@...radead.org>,
        Brian Norris <computersforpeace@...il.com>,
        <linux-mtd@...ts.infradead.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 1/7] mtd: spi-nor: cadence-quadspi: add a delay in write
 sequence



On Thursday 10 August 2017 05:38 AM, Rob Herring wrote:
> On Tue, Aug 01, 2017 at 10:24:28AM +0530, Vignesh R wrote:
>> As per 66AK2G02 TRM[1] SPRUHY8F section 11.15.5.3 Indirect Access
>> Controller programming sequence, a delay equal to couple QSPI master
>> clock(~5ns) is required after setting CQSPI_REG_INDIRECTWR_START bit and
>> writing data to the flash. Add a new compatible to handle the couple of
>> cycles of delay required in the indirect write sequence, since this
>> delay is specific to TI 66AK2G SoC.
>>
>> [1]http://www.ti.com/lit/ug/spruhy8f/spruhy8f.pdf
>>
>> Signed-off-by: Vignesh R <vigneshr@...com>
>> ---
>>  Documentation/devicetree/bindings/mtd/cadence-quadspi.txt |  1 +
>>  drivers/mtd/spi-nor/cadence-quadspi.c                     | 13 +++++++++++++
>>  2 files changed, 14 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/mtd/cadence-quadspi.txt b/Documentation/devicetree/bindings/mtd/cadence-quadspi.txt
>> index f248056da24c..fdd511a83511 100644
>> --- a/Documentation/devicetree/bindings/mtd/cadence-quadspi.txt
>> +++ b/Documentation/devicetree/bindings/mtd/cadence-quadspi.txt
>> @@ -2,6 +2,7 @@
>>  
>>  Required properties:
>>  - compatible : Should be "cdns,qspi-nor".
>> +	       Should be "ti,k2g-qspi" for TI 66AK2G platform.
> 
> Also, this doesn't indicate that "cdns,qspi-nor" is a fallback as you 
> have in the dts files. Reformat to 1 valid combination per line.
> 

Agreed, will fix it in v2.

-- 
Regards
Vignesh