linux-kernel - Re: [PATCH v9 0/4] Add gpio/pinconf support to Broadcom Cygnus SoC

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Date:	Wed, 25 Feb 2015 11:30:59 -0800
From:	Dmitry Torokhov <dtor@...omium.org>
To:	Ray Jui <rjui@...adcom.com>
Cc:	Linus Walleij <linus.walleij@...aro.org>,
	Alexandre Courbot <gnurou@...il.com>,
	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>,
	Grant Likely <grant.likely@...aro.org>,
	Christian Daudt <bcm@...thebug.org>,
	Matt Porter <mporter@...aro.org>,
	Florian Fainelli <f.fainelli@...il.com>,
	Russell King <linux@....linux.org.uk>,
	Joe Perches <joe@...ches.com>, Arnd Bergmann <arnd@...db.de>,
	Scott Branden <sbranden@...adcom.com>,
	Anatol Pomazau <anatol@...gle.com>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-gpio@...r.kernel.org, bcm-kernel-feedback-list@...adcom.com,
	devicetree@...r.kernel.org
Subject: Re: [PATCH v9 0/4] Add gpio/pinconf support to Broadcom Cygnus SoC

On Tue, Feb 10, 2015 at 02:16:20PM -0800, Ray Jui wrote:
> This patchset contains the initial GPIO/PINCONF support for the Broadcom
> Cygnus SoC.
> 
> Cygnus has 3 GPIO controllers: 1) the ASIU GPIO; 2) the chipCommonG GPIO;
> and 3) the ALWAYS-ON GPIO. All 3 types of GPIO controllers are supported by
> the this driver.
> 
> All 3 Cygnus GPIO controllers support basic PINCONF functions such as bias
> pull up, pull down, and drive strength configurations, when these pins are
> muxed to GPIO.
> 
> Pins from the ASIU GPIO can be individually muxed to GPIO function, through
> interaction with the Cygnus IOMUX controller.
> 
> Note this patchset has a dependency on the other patchset "Add pinctrl support
> to Broadcom Cygnus SoC" that is also under review
> 
> Changes from v8:
>  - Add code in function 'cygnus_gpio_pinmux_add_range' to free pinmux
>    node resource by calling of_node_put
>  - Drop .suppress_bind_attrs = true, since this is already done in
>    platform_driver_probe
> 
> Changes from v7:
>  - Use 'bool' instead of 'int' for flag that indicates pinmux support in the
>    driver
>  - Call put_device to drop reference to the pinmux dev after call to
>    of_find_device_by_node
>  - Replace kasprintf with devm_kasprintf and remove memory deallocation logic
>    in the driver
>  - Set suppress_bind_attrs to true for the driver
> 
> Changes from v6:
>  - Move the driver from drivers/gpio/* to drivers/pinctrl/* since this driver
>    supports both GPIO and some basic PINCONF features
>  - Support PINCONF features through standard DT subnodes properties including
>    "bias-disable", "bias-pull-up", "bias-pull-down", and "drive-strength", by
>    creating local PINCONF controller
>  - Add support to allow individual ASIU GPIO pins to be muxed as GPIO, through
>    interactions with the Cygnus IOMUX driver
>  - Convert the driver to use standard GPIOCHIP_IRQ APIs. This helps to reduce
>    customized code in the driver
>  - Other miscellaneous imrpovements in the driver
>  - Enable GPIO based phone hook detection support for BCM911360 phone factor
>    board
> 
> Changes from v5:
>  - Get rid of DT property "linux,gpio-base". Use dynamic allocation for GPIO base
>    number
> 
> Changes from v4:
>  - Use DT property "linux,gpio-base" to define GPIO base number
>  - factorize common code to improve code readability and reduce code size
>  - remove "bcm_" prefix on function and struct names
>  - improve debugging prints
>  - default GPIO_BCM_CYGNUS to y in Kconfig (it still depends on
>    ARCH_BCM_CYGNUS). This way we do not need to select it from the
>    arch/arm/mach-bcm/Kconfig
>  - Get rid of redundant MAINTAINER entry for this driver. It will be maintained
>    by Broadcom iProc/Cygnus maintainers
>  - Update device tree document based on driver changes
> 
> Changes from v3:
>  - Fix dt property tpyo
>  - Fix incorrect GPIO compatible ID in device tree binding document example
> 
> Changes from v2:
>  - Consolidate different compatible IDs into "brcm,cygnus-gpio"
>  - Get rid of redundant "no-interrupt" property
> 
> Changes from v1:
>  - Get rid of inline qualifier
>  - Get rid of redundant check in the ISR
>  - Other minor fixes to imrove code readability

FWIW I tested this series on BCM958305K SVK.

Tested-by: Dmitry Torokhov <dtor@...omium.org>

Thanks.

-- 
Dmitry
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