linux-kernel - Re: [PATCH V5 09/15] spi: Add stacked and parallel memories support in SPI core

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Message-ID: <560c01eb-7166-4b56-b9e0-77cacf83cf69@sirena.org.uk>
Date:   Tue, 7 Mar 2023 14:01:37 +0000
From:   Mark Brown <broonie@...nel.org>
To:     Tudor Ambarus <tudor.ambarus@...aro.org>
Cc:     "Mahapatra, Amit Kumar" <amit.kumar-mahapatra@....com>,
        "miquel.raynal@...tlin.com" <miquel.raynal@...tlin.com>,
        "richard@....at" <richard@....at>,
        "vigneshr@...com" <vigneshr@...com>,
        "jic23@...nel.org" <jic23@...nel.org>,
        "pratyush@...nel.org" <pratyush@...nel.org>,
        "linux-spi@...r.kernel.org" <linux-spi@...r.kernel.org>,
        "linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V5 09/15] spi: Add stacked and parallel memories support
 in SPI core

On Tue, Mar 07, 2023 at 11:47:27AM +0000, Tudor Ambarus wrote:
> On 3/7/23 11:37, Mahapatra, Amit Kumar wrote:

> > > On 3/6/23 17:21, Amit Kumar Mahapatra wrote:	
> > > > Multi CS support using GPIO is not tested due to unavailability of
> > > > necessary hardware setup.

> > > Please don't add code that is not used or tested.

> > During our discussion on the RFC, Mark had suggested to add multi-cs support
> > via GPIO as well. We had agreed to add multi-cs support via GPIO, but had also
> > mentioned that we don't have a hardware setup to test the CS GPIO use case.
> > https://lore.kernel.org/linux-arm-kernel/BN7PR12MB2802E2A9079E505932832270DC979@BN7PR12MB2802.namprd12.prod.outlook.com/

> Ok, his call then.

As well as hopefully working if anyone does need it GPIO implementations
also serve as documentation of what we're expecting hardware to do when
it implements things.

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