linux-kernel - Re: [PATCH 1/3] power: max17042_battery: Use reg type instead of chip type

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Date:	Wed, 1 Apr 2015 10:18:53 +0200
From:	Krzysztof Kozlowski <k.kozlowski@...sung.com>
To:	Beomho Seo <beomho.seo@...sung.com>
Cc:	lee.jones@...aro.org, galak@...eaurora.org,
	linux-kernel@...r.kernel.org, cw00.choi@...sung.com,
	sangbae90.lee@...sung.com, inki.dae@...sung.com,
	Kozik <k.kozlowski@...sung.com>, linux-pm@...r.kernel.org,
	myungjoo.ham@...sung.com, Sebastian Reichel <sre@...nel.org>,
	jonghwa3.lee@...sung.com
Subject: Re: [PATCH 1/3] power: max17042_battery: Use reg type instead of chip type

2015-03-31 15:29 GMT+02:00 Beomho Seo <beomho.seo@...sung.com>:
> Currently, max17042 battery driver choose register map by MAX17042_DevName
> register. But thid register is return IC specific firmware version. So other
> maxim chip hard to use this drvier. This patch choose reg_type by driver_data.

I don't quite get the concept of "reg_type" and why it replaces chip
type? It seems that you choose reg_type based on given chip type so
there is direct mapping chip_type->reg_type. If max17047 and max17050
are the same from the point of view of interface (registers) then they
should use the same compatible or the same device type. Something
like:

>  static const struct i2c_device_id max17042_id[] = {
> -       { "max17042", 0 },
> -       { "max17047", 1 },
> -       { "max17050", 2 },
> +       { "max17042", MAXIM_DEVICE_TYPE_MAX17042 },
> +       { "max17047", MAXIM_DEVICE_TYPE_MAX17047 },
> +       { "max17050", MAXIM_DEVICE_TYPE_MAX17047 }, /* Same as 17047 */
>         { }

So why you are adding the conversion from i2c_device_id -> reg_type?

Beside that, thanks for integrating this into existing driver! Much appreciated.

Best regards,
Krzysztof
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