linux-kernel - Re: [PATCH v5 1/4] drivers/mfd/menf21bmc: introduce MEN 14F021P00 BMC MFD Core driver

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Date:	Wed, 27 Aug 2014 12:29:56 +0100
From:	Lee Jones <lee.jones@...aro.org>
To:	Andreas Werner <andreas.werner@....de>
Cc:	linux-kernel@...r.kernel.org, sameo@...ux.intel.com, wim@...ana.be,
	linux-watchdog@...r.kernel.org, cooloney@...il.com,
	rpurdie@...ys.net, linux-leds@...r.kernel.org, jdelvare@...e.de,
	linux@...ck-us.net, lm-sensors@...sensors.org,
	johannes.thumshirn@....de
Subject: Re: [PATCH v5 1/4] drivers/mfd/menf21bmc: introduce MEN 14F021P00
 BMC MFD Core driver

On Wed, 27 Aug 2014, Andreas Werner wrote:

> On Wed, Aug 27, 2014 at 12:01:42PM +0100, Lee Jones wrote:
> > On Wed, 27 Aug 2014, Andreas Werner wrote:
> > > On Wed, Aug 27, 2014 at 08:26:33AM +0100, Lee Jones wrote:
> > > > On Tue, 26 Aug 2014, Andreas Werner wrote:
> > > > > The MEN 14F021P00 Board Management Controller provides an
> > > > > I2C interface to the host to access the feature implemented in the BMC.
> > > > > The BMC is a PIC Microntroller assembled on CPCI Card from MEN Mikroelektronik
> > > > > and on a few Box/Display Computer.
> > > > > 
> > > > > Added MFD Core driver, supporting the I2C communication to the device.
> > > > > 
> > > > > The MFD driver currently supports the following features:
> > > > >  	- Watchdog
> > > > >  	- LEDs
> > > > > 	- Hwmon (voltage monitoring)
> > > > > 
> > > > > Signed-off-by: Andreas Werner <andreas.werner@....de>
> > > > > Acked-by: Lee Jones <lee.jones@...aro.org>
> > > > > ---
> > > > >  drivers/mfd/Kconfig     |  12 +++++
> > > > >  drivers/mfd/Makefile    |   1 +
> > > > >  drivers/mfd/menf21bmc.c | 132 ++++++++++++++++++++++++++++++++++++++++++++++++
> > > > >  3 files changed, 145 insertions(+)
> > > > >  create mode 100644 drivers/mfd/menf21bmc.c
> > > > > 
> > > > > diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
> > > > > index b8d9ca0..6a9f101 100644
> > > > > --- a/drivers/mfd/Kconfig
> > > > > +++ b/drivers/mfd/Kconfig
> > > > > @@ -453,6 +453,18 @@ config MFD_MAX8998
> > > > >  	  additional drivers must be enabled in order to use the functionality
> > > > >  	  of the device.
> > > > >  
> > > > > +config MFD_MENF21BMC
> > > > > +	tristate "MEN 14F021P00 Board Management Controller Support"
> > > > > +	depends on I2C
> > > > > +	select MFD_CORE
> > > > > +	help
> > > > > +	  Say yes here to add support for the MEN 14F021P00 BMC
> > > > > +	  which is a Board Management Controller connected to the I2C bus.
> > > > > +	  The device supports multiple sub-devices like LED, HWMON  and WDT.
> > > > 
> > > > Nit: Whitespace error.
> > > > 
> > > 
> > > I run checkpatch but did not find any whitespace error.
> > > Where is it?
> > 
> > After 'HWMON'.
> >
> 
> Ah ok.
>  
> > > > > +MODULE_DEVICE_TABLE(i2c, menf21bmc_id_table);
> > > > > +
> > > > > +static struct i2c_driver menf21bmc_driver = {
> > > > > +	.driver.name	= "menf21bmc",
> > > > > +	.id_table	= menf21bmc_id_table,
> > > > > +	.probe		= menf21bmc_probe,
> > > > > +	.remove		= menf21bmc_remove,
> > > > > +};
> > > > 
> > > > No DT support?
> > > > 
> > > 
> > > No not at the moment because it is used only on x86 system.
> > 
> > Ah okay.  Shouldn't the Kconfig depend on X86 then?  What about ACPI?
> 
> Yes and no. Could be also instantiated manually withouth DT. (e.g. i2c sysfs)
> So for me it is better to not depend on x86 to have the possibility to use
> the driver without DT on another arch.
> ACPI is no option because there are a lot boards out without
> the BMC in ACPI Table.
> 
> I think i will implement DT support if we have on board which is not x86.

Very well.

> > > > > +module_i2c_driver(menf21bmc_driver);
> > > > > +
> > > > > +MODULE_DESCRIPTION("MEN 14F021P00 BMC mfd core driver");
> > > > 
> > > > s/mfd/MFD
> > > > 
> > > > > +MODULE_AUTHOR("Andreas Werner <andreas.werner@....de>");
> > > > > +MODULE_LICENSE("GPL v2");
> > > > 
> > 

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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