linux-kernel - Re: [PATCH v4 4/5] ARM: dts: DRA7: add entry for qspi mmap region

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Date:	Thu, 10 Dec 2015 10:34:23 +0530
From:	Vignesh R <vigneshr@...com>
To:	Tony Lindgren <tony@...mide.com>
CC:	Brian Norris <computersforpeace@...il.com>,
	Mark Brown <broonie@...nel.org>,
	Rob Herring <robh+dt@...nel.org>,
	Russell King <linux@....linux.org.uk>,
	"hramrach@...il.com" <hramrach@...il.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
	"linux-spi@...r.kernel.org" <linux-spi@...r.kernel.org>
Subject: Re: [PATCH v4 4/5] ARM: dts: DRA7: add entry for qspi mmap region



On 12/03/2015 03:51 PM, Vignesh R wrote:
> 
> 
> On 12/01/2015 10:09 PM, Tony Lindgren wrote:
>> * Vignesh R <vigneshr@...com> [151130 20:46]:
>>> On 12/01/2015 04:04 AM, Tony Lindgren wrote:
>>>>
...
>>
>> OK. They are both on L3 main so that won't cause any issues for separate
>> interconnect driver instances. As they are still separate targets flushing
>> a posted write to one area will not flush anything to the other.
>>
> 
> I didn't quite understand what you meant by interconnect driver instance.
> qspi_base and qspi_mmap region are tightly bound to each other and both
> needs to be accessed by ti-qspi driver (though different targets).
> Besides qspi_mmap region is only used to read data, there will not be
> any write accesses to this target. Are you saying this binding is not
> viable?
> 

As I stated above qspi_base and qspi_mmap region are tightly bound,
there is no way to use qspi_mmap region w/o accessing qspi_base. So I am
planning to keep them as it is. I will move qspi_ctrlmod to use syscon.
Something like:

qspi: qspi@...00000 {
       compatible = "ti,dra7xxx-qspi";
       reg = <0x4b300000 0x100>,
             <0x5c000000 0x4000000>,
       reg-names = "qspi_base", "qspi_mmap";
       syscon-chipselects = <&scm_conf 0x558>;
       #address-cells = <1>;
       #size-cells = <0>;
       spi-max-frequency = <48000000>;
       ti,hwmods = "qspi";
};

Do you think this is not viable in future?


-- 
Regards
Vignesh
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