linux-kernel - Re: [PATCH v6] arm: pxa: support ICP DAS LP-8x4x FPGA irq

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Message-ID: <20160227174100.GG7219@io.lakedaemon.net>
Date:	Sat, 27 Feb 2016 17:41:00 +0000
From:	Jason Cooper <jason@...edaemon.net>
To:	Sergei Ianovich <ynvich@...il.com>
Cc:	linux-kernel@...r.kernel.org, Arnd Bergmann <arnd@...db.de>,
	Rob Herring <robh@...nel.org>,
	Marc Zyngier <marc.zyngier@....com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	"open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
	<devicetree@...r.kernel.org>
Subject: Re: [PATCH v6] arm: pxa: support ICP DAS LP-8x4x FPGA irq

Hi Sergei,

Marc, Rob, please see below.

On Sat, Feb 27, 2016 at 06:56:01PM +0300, Sergei Ianovich wrote:
> 

nit: Subject line of the patch should match 'irqchip/lp8841: [A-Z].*'

> ICP DAS LP-8x4x contains FPGA chip. The chip functions as an interrupt
> source providing 16 additional interrupts among other things. The
> interrupt lines are muxed to a GPIO pin of a 2nd level PXA-GPIO
> interrupt controller. GPIO pins of the 2nd level controller are in turn
> muxed to a CPU interrupt line.
> 
> Until pxa is completely converted to device tree, it is impossible
> to use IRQCHIP_DECLARE() and the irqdomain needs to added manually.
> Drivers for the on-CPU IRQs and GPIO-IRQs are loaded using
> postcore_initcall(). We need to have all irq domain drivers loaded prior
> to DT parsing in order to allow normal initialization of IRQ resources
> with DT.
> 
> Signed-off-by: Sergei Ianovich <ynvich@...il.com>
> Reviewed-by: Linus Walleij <linus.walleij@...aro.org>

nit:  From here, down should be below the '---' so that it isn't a part
of the commit log.  We add a link to the commit log that points to the
patch submission in the mailinglist archives.  So curious folks have
quick access to this info.

> CC: Arnd Bergmann <arnd@...db.de>
> CC: Rob Herring <robh@...nel.org>
> CC: Marc Zyngier <marc.zyngier@....com>
> 
>    v5..v6
>    fixes according to Rob Herring review comments:
>    * drop wildcards in binding and file names
>    * rename alias 'fpga'->'fpga_irq'
> 
>    fixes according to Marc Zyngier review comments:
>    * use writeb/readb not iowrite8/ioread8
>    * redefine 2nd mask using inversion on 1st
>    * add comments
> 
>    v4..v5
>    * constify struct of_device_id
>    * drop irq number from handler signature
> 
>    v3.2..v4
>    * move DTS binding to a different patch (8/21)
> 
>    v3.1..v3.2
>    fixes to apply Linus Walleij's "Reviewed-by":
>    * add kerneldoc comment for state container struct
>    * rename irq -> hwirq for clarity
>    * drop overzealous error checks from the hotpaths
> 
>    v3..v3.1
>    fixes according to Linus Walleij review comments:
>    * update commit message
>    * use state container instead of global variables
>    * get hardware irq nums from irq_data, don't calculate them
>    * use BIT() macro
>    * add defines for system irq register masks
>    * replace cycle control variable with break
>    * use better names for resource variables
>    * add a linear domain instead of a legacy one
>    * use irq_create_mapping() instead of irq_alloc_desc()
> 
>    v2..v3
>    * no changes (except number 09/16 -> 11/21)
> 
>    v0..v2
>    * extract irqchip and move to drivers/irqchip/
>    * use device tree
>    * use devm helpers where possible


> ---

iow, it should be moved here.

>  .../interrupt-controller/icpdas-lp8x4x-irq.txt     |  49 ++++
>  drivers/irqchip/Kconfig                            |   5 +
>  drivers/irqchip/Makefile                           |   1 +
>  drivers/irqchip/irq-lp8841.c                       | 246 +++++++++++++++++++++
>  4 files changed, 301 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/interrupt-controller/icpdas-lp8x4x-irq.txt
>  create mode 100644 drivers/irqchip/irq-lp8841.c

I don't seem to have the previous versions, and their threads, in my
email archive.  From the changelog, it looks like Marc and Rob have been
reviewing this most recently.

If you guys could give me an Acked-by/Reviewed-by, I'll go ahead and
queue this up for v4.6.

I'll fix up the Subject line and the commit log when I bring it in.
I'll be adding the tags anyway.  No need to resubmit.

thx,

Jason.