Re: [PATCH v3 1/5] mfd: max14577: Add max14577 MFD driver core

[Lee Jones]

On Fri, 22 Nov 2013, Krzysztof Kozlowski wrote:

> From: Chanwoo Choi <cw00.choi@xxxxxxxxxxx>
> 
> This patch adds max14577 core/irq driver to support MUIC(Micro USB IC)
> device and charger device and support irq domain method to control
> internal interrupt of max14577 device. Also, this patch supports DT
> binding with max14577_i2c_parse_dt().
> 
> The MAXIM 14577 chip contains Micro-USB Interface Circuit and Li+ Battery
> Charger. It contains accessory and USB charger detection logic. It supports
> USB 2.0 Hi-Speed, UART and stereo audio signals over Micro-USB connector.
> 
> The battery charger is compliant with the USB Battery Charging Specification
> Revision 1.1. It has also SFOUT LDO output for powering USB devices.
> 
> Signed-off-by: Chanwoo Choi <cw00.choi@xxxxxxxxxxx>
> Signed-off-by: Krzysztof Kozlowski <k.kozlowski@xxxxxxxxxxx>
> Signed-off-by: Kyungmin Park <kyungmin.park@xxxxxxxxxxx>
> ---
>  drivers/mfd/Kconfig                  |   13 ++
>  drivers/mfd/Makefile                 |    1 +
>  drivers/mfd/max14577.c               |  241 +++++++++++++++++++++++++
>  include/linux/mfd/max14577-private.h |  324 ++++++++++++++++++++++++++++++++++
>  include/linux/mfd/max14577.h         |   70 ++++++++
>  5 files changed, 649 insertions(+)
>  create mode 100644 drivers/mfd/max14577.c
>  create mode 100644 include/linux/mfd/max14577-private.h
>  create mode 100644 include/linux/mfd/max14577.h

<snip>

> +static struct mfd_cell max14577_devs[] = {
> +	{ .name = "max14577-muic", },
> +	{ .name = "max14577-regulator", },
> +	{ .name = "max14577-charger", },
> +};

If these all support device tree, shouldn't you be populating
max14577_devs[x].of_compatible too? That way the MFD core will
automatically setup your dev.of_node pointers for you?

<snip>

> +	max14577->vendor_id = (reg_data & 0x7);
> +	max14577->device_id = ((reg_data & 0xF8) >> 0x3);

I'm not too keen on these magic numbers, can you create #defines for
them please? If there are any other interesting address, it might be
worth creating some for those too.

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