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Date:	Tue, 6 Oct 2015 12:54:58 +0300
From:	Roger Quadros <>
To:	Tony Lindgren <>
CC:	<>, <>,
	<>, <>,
	<>, <>,
	<>, <>,
	<>, <>
Subject: Re: [PATCH v3 00/27] memory: omap-gpmc: mtd: nand: Support GPMC NAND
 on non-OMAP platforms

On 06/10/15 11:33, Tony Lindgren wrote:
> * Roger Quadros <> [150930 04:04]:
>> Tony,
>> On 18/09/15 17:53, Roger Quadros wrote:
>>> Hi,
>>> We do a couple of things in this series which result in
>>> cleaner device tree implementation, faster perfomance and
>>> multi-platform support. As an added bonus we get new GPI/Interrupt pins
>>> for use in the system.
>>> - Establish a custom interface between NAND and GPMC driver. This is
>>> needed because all of the NAND registers sit in the GPMC register space.
>>> Some bits like NAND IRQ are even shared with GPMC.
>>> - Remove NAND IRQ handling from omap-gpmc driver, share the GPMC IRQ
>>> with the omap2-nand driver and handle NAND IRQ events in the NAND driver.
>>> This causes performance increase when using prefetch-irq mode.
>>> 30% increase in read, 17% increase in write in prefetch-irq mode.
>>> - Clean up device tree support so that omap-gpmc IP and the omap2 NAND
>>> driver can be used on non-OMAP platforms. e.g. Keystone.
>>> - Implement GPIOCHIP + IRQCHIP for the GPMC WAITPINS. SoCs can contain
>>> 2 to 4 of these and most of them would be unused otherwise. It also
>>> allows a cleaner implementation of NAND Ready pin status for the NAND driver.
>>> - Implement GPIOlib based NAND ready pin checking for OMAP NAND driver.
>>> This series is available at
>>> in branch
>>> for-v4.4/gpmc-v3
> In general, very nice work :)

Thanks :)

>> I've verified this series with the following boards
>> -dra7-evm
>> -am437x-gp-evm
>> -am335x-evm
>> -beagleboard-c4
>> For legacy boot I've checked only on beagleboard-c4.
> Great.
> Does build and boot and use NAND work throughtout the series?
> Otherwise we'll have hard time bisecting anything..

Yes it does with the following exceptions.

- Patch 7 "memory: omap-gpmc: Remove NAND IRQ code" breaks prefetch-irq mode
but none of the boards seem to be using it so it shouldn't break NAND on existing boards.
At patch 9 "mtd: nand: omap2: manage NAND interrupts" prefetch-irq mode is working again.
Do you want me to squash patches 7,8,9 so that pre-fetch irq is not broken at any point?

- Then at patch 11 "mtd: nand: omap: Clean up device tree support" we break NAND on all DT
boards as we expect NAND to be a real child node with compatible id. Simply applying the
DT patch at this point makes it work again.

>> Test procedure was to read an existing ubifs partition,
>> create a new one and read it back.
>> Need you to Ack if it looks good.
>> Do you mind taking it via omap-soc once MTD maintainers ack their relevant parts?
> Sure. I'll try to do some testing on the series first too.

> Can the dts changes be merged separtely? Otherwise we'll have
> a dependency between dts branch and the GPMC/NAND changes.

I'm afraid no. Patch 11 makes us incompatible with the old DT.

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