Re: [rtc-linux] [PATCH V2 1/4] mfd: da9062: DA9062 MFD core driver

[Alexandre Belloni <alexandre.belloni@free-electrons.com>]

On 14/05/2015 at 17:43:52 +0100, S Twiss wrote :
> +config MFD_DA9062
> +	tristate "Dialog Semiconductor DA9062 PMIC Support"
> +	select MFD_CORE
> +	select REGMAP_I2C
> +	select REGMAP_IRQ
> +	depends on I2C=y

Isn't depends on I2C enough?

> diff --git a/drivers/mfd/da9062-core.c b/drivers/mfd/da9062-core.c
> new file mode 100644
> index 0000000..e6a9878
> --- /dev/null
> +++ b/drivers/mfd/da9062-core.c
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/init.h>
> +#include <linux/slab.h>
> +#include <linux/device.h>
> +#include <linux/delay.h>
> +#include <linux/interrupt.h>
> +#include <linux/mutex.h>
> +#include <linux/regmap.h>
> +
> +#include <linux/irq.h>
> +#include <linux/mfd/core.h>
> +#include <linux/i2c.h>
> +#include <linux/err.h>
> +
> +#include <linux/mfd/da9062/core.h>
> +#include <linux/mfd/da9062/registers.h>
> +#include <linux/of.h>
> +#include <linux/regulator/of_regulator.h>
> +
> +#include <linux/proc_fs.h>
> +#include <linux/kthread.h>
> +#include <linux/uaccess.h>
> +

You should order the header inclusions alphabetically

[...]

> +	{
> +		.name		= "da9062-watchdog",
> +		.num_resources	= ARRAY_SIZE(da9062_wdt_resources),
> +		.resources	= da9062_wdt_resources,
> +		.of_compatible  = "dlg,da9062-wdt",
> +	},
> +	{
> +		.name		= "da9062-onkey",
> +		.num_resources	= ARRAY_SIZE(da9062_onkey_resources),
> +		.resources	= da9062_onkey_resources,
> +		.of_compatible  = "dlg,da9062-onkey",
> +	},
> +	{
> +		.name		= "da9062-thermal",
> +		.num_resources	= ARRAY_SIZE(da9062_thermal_resources),
> +		.resources	= da9062_thermal_resources,
> +		.of_compatible  = "dlg,da9062-thermal",
> +	},
> +	{
> +		.name		= "da9062-rtc",
> +		.num_resources	= ARRAY_SIZE(da9062_rtc_resources),
> +		.resources	= da9062_rtc_resources,
> +		.of_compatible  = "dlg,da9062-rtc",

Did you try to use "da9063-rtc"? The register set seems to be exactly
the same. Unfortunately, the datasheet are not available on the diasemi
website...

Also, the .of_compatibles are not necessary because you don't add any of
bindings to the underlying drivers. The match happens on .name.

> diff --git a/include/linux/mfd/da9062/registers.h b/include/linux/mfd/da9062/registers.h
> new file mode 100644
> index 0000000..d07c2bc
> --- /dev/null
> +++ b/include/linux/mfd/da9062/registers.h

Comparing that file with da9063/registers.h, It really seems that
DA062AA, DA9063AD and DA9063BB are register compatible, apart from a few
differences in the regulator and the gpio count.

Also, at least the watchdog and rtc driver are duplicating their da9063
counterpart. I'm not trying to annoy you, I just want you to understand
that the less code is duplicated, the easiest it will be to maintain
later.


-- 
Alexandre Belloni, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com