linux-kernel - Re: [PATCH 0/6] Add support for BCM7271 style interrupt controller

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Date:   Fri, 7 Jul 2017 12:39:44 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Doug Berger <opendmb@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>
Cc:     Jason Cooper <jason@...edaemon.net>,
        Marc Zyngier <marc.zyngier@....com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Kevin Cernekee <cernekee@...il.com>,
        Brian Norris <computersforpeace@...il.com>,
        Gregory Fong <gregory.0xf0@...il.com>,
        bcm-kernel-feedback-list@...adcom.com,
        Marc Gonzalez <marc_gonzalez@...madesigns.com>,
        Bartosz Golaszewski <brgl@...ev.pl>,
        Sebastian Frias <sf84@...oste.net>,
        Boris Brezillon <boris.brezillon@...e-electrons.com>,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-mips@...ux-mips.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 0/6] Add support for BCM7271 style interrupt controller

On 07/07/2017 12:34 PM, Doug Berger wrote:
> Sorry, messed up the CC list.
> 
> On 07/07/2017 12:20 PM, Doug Berger wrote:
>> This patch set extends the functionality of the irq-brcmstb-l2 interrupt
>> controller driver to cover a hardware variant first introduced in the
>> BCM7271 SoC.  The main difference between this variant and the block
>> found in earlier brcmstb SoCs is that this variant only supports level
>> sensitive interrupts and therefore does not latch the interrupt state
>> based on edges.  Since there is no longer a need to ack interrupts with
>> a register write to clear the latch the register map has been changed.
>>
>> Therefore the change to add support for the new hardware block is to
>> abstract the register accesses to accommodate different maps and to
>> identify the block with a new device-tree compatible string.
>>
>> I also took the opportunity to make some small efficiency enhancements
>> to the driver.  One of these was to make use of the slightly more
>> efficient irq_mask_ack method.  However, I discovered that the defined
>> irq_gc_mask_disable_reg_and_ack() generic irq function was insufficient
>> for my needs.  The first three commits of this set are intended to be a
>> correction and extension of the existing generic irq implementation to
>> provide a set of functions that can be used by interrupt controller
>> drivers for their irq_mask_ack method.
>>
>> I believe these first three commits should be added to the irq/core
>> repository and the remaining commits should be added to the Broadcom
>> github repository but have included the complete set here for improved
>> context.  This entire set is therefore based on the irq/core master
>> branch.  Please let me know if you would like a different packaging.

The irqchip maintainers (Thomas, Jason, Marc Z.) will probably want to
get irqchip drivers changes through their tree:

IRQCHIP DRIVERS
M:      Thomas Gleixner <tglx@...utronix.de>
M:      Jason Cooper <jason@...edaemon.net>
M:      Marc Zyngier <marc.zyngier@....com>
L:      linux-kernel@...r.kernel.org
S:      Maintained
T:      git git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git
irq/core
T:      git git://git.infradead.org/users/jcooper/linux.git irqchip/core
F:      Documentation/devicetree/bindings/interrupt-controller/
F:      drivers/irqchip/

Will reply to the individual patches, thanks for getting this out.

>>
>> If the changes to genirq are not acceptable I can implement the
>> irq_mask_ask method locally in the irq-brcmstb-l2 driver and submit
>> that on its own.
>>
>> Doug Berger (5):
>>   genirq: generic chip: add generic irq_mask_ack functions
>>   genirq: generic chip: remove irq_gc_mask_disable_reg_and_ack()
>>   irqchip: brcmstb-l2: Remove some processing from the handler
>>   irqchip: brcmstb-l2: Abstract register accesses
>>   irqchip: brcmstb-l2: Add support for the BCM7271 L2 controller
>>
>> Florian Fainelli (1):
>>   irqchip/tango: Use irq_gc_mask_disable_and_ack_set
>>
>>  .../bindings/interrupt-controller/brcm,l2-intc.txt |   3 +-
>>  drivers/irqchip/irq-brcmstb-l2.c                   | 145 ++++++++++++++-------
>>  drivers/irqchip/irq-tango.c                        |   2 +-
>>  include/linux/irq.h                                |   7 +-
>>  kernel/irq/generic-chip.c                          | 110 +++++++++++++++-
>>  5 files changed, 214 insertions(+), 53 deletions(-)
>>
> 


-- 
Florian