[U-Boot] [U-Boot PATCH 1/3] gpio: pcf8575: Add pcf8575 driver to control gpio lines

[Tom Rini <trini@konsulko.com>]

On Wed, Mar 11, 2015 at 02:19:32PM +0530, Vignesh R wrote:
> 
> 
> On Tuesday 10 March 2015 09:33 PM, Tom Rini wrote:
> > On Tue, Mar 10, 2015 at 08:41:21PM +0530, Vignesh R wrote:
> > 
> >> TI's pcf8575 is a 16-bit I2C based GPIO expander.The device features a
> >> 16-bit quasi-bidirectional I/O ports. Each quasi-bidirectional I/O can
> >> be used as an input or output without the use of a data-direction
> >> control signal. The I/Os should be high before being used as inputs.
> >>
> >> This driver is based on pcf857x driver available in Linux 4.0 kernel.
> >> It supports basic reading and writing of gpio pins.
> > 
> > For attribution of stuff ported from the kernel please see
> > http://www.denx.de/wiki/view/U-Boot/Patches#Attributing_Code_Copyrights_Sign
> > 
> > [snip]
> >> diff --git a/drivers/gpio/pcf8575.c b/drivers/gpio/pcf8575.c
> >> new file mode 100644
> >> index 000000000000..1ee92a29760a
> >> --- /dev/null
> >> +++ b/drivers/gpio/pcf8575.c
> >> @@ -0,0 +1,248 @@
> >> +/*
> >> + * PCF8575 I2C GPIO EXPANDER DRIVER
> >> + *
> >> + * Copyright (C) 2015 Texas Instruments Incorporated - http://www.ti.com/
> >> + *
> >> + * 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 version 2.
> >> + *
> >> + * This program is distributed "as is" WITHOUT ANY WARRANTY of any
> >> + * kind, whether express or implied; without even the implied warranty
> >> + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> >> + * GNU General Public License for more details.
> >> + */
> > 
> > Please use SPDX tags for new files, thanks.
> > 
> > And right up front, this driver isn't using device model, please re-work
> > and update to use that framework, thanks!
> 
> Thanks for reviewing.
> 
> I can switch to device model, but DRA72 does not support device tree and
> hence I will not be able use device model based pcf driver in my use-case.

Starting the move to DT is very easy, I would swear.  For example,
am335x_boneblack_vboot switches am335x over to DM and includes a device
tree, but it's only used for the verified boot part now.

-- 
Tom
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