linux-kernel - Re: [PATCH 2/3] regulator: tps6586x: add voltage table for tps658643

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Date:	Wed, 27 Nov 2013 10:09:16 -0700
From:	Stephen Warren <swarren@...dotorg.org>
To:	Stefan Agner <stefan@...er.ch>, thierry.reding@...il.com,
	sameo@...ux.intel.com, dev@...xeye.de
CC:	mark.rutland@....com, linux-tegra@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] regulator: tps6586x: add voltage table for tps658643

On 11/26/2013 04:45 PM, Stefan Agner wrote:
> Depending on version, the voltage table might be different. Add version
> compatibility to the regulator information in order to select correct
> voltage table.

> diff --git a/drivers/regulator/tps6586x-regulator.c b/drivers/regulator/tps6586x-regulator.c

> -static const unsigned int tps6586x_ldo4_voltages[] = {
> +static const unsigned int tps6586x_ldo4_sm2_voltages[] = {

> +static const unsigned int tps658643_sm2_voltages[] = {

What's the logic behind the "ldo4_sm2" v.s. "sm2" naming? Does it match
the data sheet in some way? If not, it might be better to name this
something like "tps6586x_ldo4_voltages" and "tps65863_ldo4_voltages".

> -#define TPS6586X_REGULATOR(_id, _pin_name, vdata, vreg, shift, nbits,	\
> -			   ereg0, ebit0, ereg1, ebit1, goreg, gobit)	\
> +#define TPS6586X_REG(_ver, _id, _pin_name, vdata, vreg, shift,	nbits,	\
> +		     ereg0, ebit0, ereg1, ebit1, goreg, gobit)		\

Why rename the macro?

There's an embedded TAB before "nbits".

> +/* Add version specific entries before any */
>  static struct tps6586x_regulator tps6586x_regulator[] = {
>  	TPS6586X_SYS_REGULATOR(),
> -	TPS6586X_LDO(LDO_0, "vinldo01", ldo0, SUPPLYV1, 5, 3, ENC, 0, END, 0),
...
> +	TPS6586X_LDO(TPS6586X_ANY, LDO_0, "vinldo01", tps6586x_ldo0, SUPPLYV1,
> +			5, 3, ENC, 0, END, 0),

Rather than changing all the macros and table entries, wouldn't it be
much simpler to:

1) Make tps6586x_regulator[] only contain all the common regulator
definitions.

2) Add new version-specific tables for each version of regulator, so
tps6586x_other_regulator[] and tps65863_regulator[].

3) Have probe() walk multiple tables of regulators, selecting which
tables to walk based on version.

That would result in a much smaller and less invasive diff.
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