linux-kernel - Re: [PATCH 06/12] gpio: Add Aspeed driver

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Message-ID: <1469148572.5468.2.camel@aj.id.au>
Date:	Fri, 22 Jul 2016 10:19:32 +0930
From:	Andrew Jeffery <andrew@...id.au>
To:	Paul Gortmaker <paul.gortmaker@...driver.com>
Cc:	Linus Walleij <linus.walleij@...aro.org>,
	Alexandre Courbot <gnurou@...il.com>,
	Joel Stanley <joel@....id.au>,
	Mark Rutland <mark.rutland@....com>,
	Rob Herring <robh+dt@...nel.org>,
	Russell King <linux@...linux.org.uk>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Jeremy Kerr <jk@...abs.org>, devicetree@...r.kernel.org,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>, linux-gpio@...r.kernel.org,
	LKML <linux-kernel@...r.kernel.org>,
	Alistair Popple <alistair@...ple.id.au>
Subject: Re: [PATCH 06/12] gpio: Add Aspeed driver

On Thu, 2016-07-21 at 16:12 -0400, Paul Gortmaker wrote:
> On Wed, Jul 20, 2016 at 1:58 AM, Andrew Jeffery <andrew@...id.au> wrote:
> > 
> > From: Joel Stanley <joel@....id.au>
> > 
> > The Aspeed SoCs contain GPIOs grouped by letter, where each letter group
> > contains 8 pins. The GPIO letter groups are then banked in sets of four
> > in the register layout.
> > 
> > The implementation exposes multiple banks through the one driver, and
> > requests and releases pins via the pinctrl subsystem. The hardware
> > supports generation of interrupts with per-pin triggers, and exposes this
> > capability through an irqchip and devicetree.
> > 
> > A number of supported features are not yet implemented: Configuration of
> > interrupt direction (ARM or LPC), debouncing, and provides WDT reset
> > tolerance for output ports.
> > 
> > Signed-off-by: Joel Stanley <joel@....id.au>
> > Signed-off-by: Alistair Popple <alistair@...ple.id.au>
> > Signed-off-by: Jeremy Kerr <jk@...abs.org>
> > Signed-off-by: Andrew Jeffery <andrew@...id.au>
> > ---
> >  arch/arm/mach-aspeed/Kconfig |   4 +
> >  drivers/gpio/Kconfig         |   8 +-
> >  drivers/gpio/Makefile        |   1 +
> >  drivers/gpio/gpio-aspeed.c   | 456 +++++++++++++++++++++++++++++++++++++++++++
> >  4 files changed, 468 insertions(+), 1 deletion(-)
> >  create mode 100644 drivers/gpio/gpio-aspeed.c
> > 
> > diff --git a/arch/arm/mach-aspeed/Kconfig b/arch/arm/mach-aspeed/Kconfig
> > index 25a0ae01429e..a52de9d3adfb 100644
> > --- a/arch/arm/mach-aspeed/Kconfig
> > +++ b/arch/arm/mach-aspeed/Kconfig
> > @@ -6,6 +6,10 @@ menuconfig ARCH_ASPEED
> >         select ASPEED_WATCHDOG
> >         select MOXART_TIMER
> >         select PINCTRL
> > +       select GPIOLIB
> > +       select GPIO_ASPEED
> > +       select GPIO_SYSFS
> > +
> >         help
> >           Say Y here if you want to run your kernel on an ASpeed BMC SoC.
> > 
> > diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
> > index 536112fd2466..2c21b5db09cd 100644
> > --- a/drivers/gpio/Kconfig
> > +++ b/drivers/gpio/Kconfig
> > @@ -137,6 +137,13 @@ config GPIO_ATH79
> >           Select this option to enable GPIO driver for
> >           Atheros AR71XX/AR724X/AR913X SoC devices.
> > 
> > +config GPIO_ASPEED
> > +       bool "Aspeed GPIO support"
> Since this is a bool Kconfig...
> 
> > 
> > +       depends on (ARCH_ASPEED || COMPILE_TEST) && OF
> > +       select GENERIC_IRQ_CHIP
> > +       help
> > +         Say Y here to support Aspeed AST2400 and AST2500 GPIO controllers.
> > +
> [...]
> 
>  > diff --git a/drivers/gpio/gpio-aspeed.c b/drivers/gpio/gpio-aspeed.c
> > 
> > new file mode 100644
> > index 000000000000..7885adc1332a
> > --- /dev/null
> > +++ b/drivers/gpio/gpio-aspeed.c
> > @@ -0,0 +1,456 @@
> > +/*
> > + * Copyright 2015 IBM Corp
> > + *
> > + * Joel Stanley <joel@....id.au>
> > + *
> > + * This program is free software; you can redistribute it and/or
> > + * modify it under the terms of the GNU General Public License
> > + * as published by the Free Software Foundation; either version
> > + * 2 of the License, or (at your option) any later version.
> > + */
> > +
> > +#include 
> ...can you please get rid of module.h and all the MODULE_
> stuff and use the built in registration?   Alternatively change it to
> a tristate if there is a valid use case for it to be modular.
> 

I'll change it to tristate; I don't see a reason to require it be built
in.

Cheers,

Andrew
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