linux-kernel - Re: [PATCH v3 2/3] regulator: tps6586x: add and use correct voltage table

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Message-ID: <20131204093136.GN19943@ulmo.nvidia.com>
Date:	Wed, 4 Dec 2013 10:31:36 +0100
From:	Thierry Reding <thierry.reding@...il.com>
To:	Stefan Agner <stefan@...er.ch>
Cc:	swarren@...dotorg.org, dev@...xeye.de, lee.jones@...aro.org,
	lgirdwood@...il.com, broonie@...nel.org,
	kai.poggensee@...onic-design.de, sameo@...ux.intel.com,
	linux-tegra@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 2/3] regulator: tps6586x: add and use correct voltage
 table

On Tue, Dec 03, 2013 at 08:57:28PM +0100, Stefan Agner wrote:
[...]
> Changes since v2:
>   - Removed reg_ from reg_version
>   - Moved walk through version dependent tables to find_regulator_info,
>     removed the inline definition. This reduces .o size and encapsulates
>     the logic of finding the right regulator into one function. It comes
>     with a slight code duplication, the table search now appears twice.

Well, the table was searched twice in the original patch, too, so this
variant isn't any worse, really.

> ---
>  arch/arm/boot/dts/tegra20-colibri-512.dtsi |  4 +-
>  drivers/regulator/tps6586x-regulator.c     | 91 +++++++++++++++++++++++-------
>  2 files changed, 74 insertions(+), 21 deletions(-)
> 
> diff --git a/arch/arm/boot/dts/tegra20-colibri-512.dtsi b/arch/arm/boot/dts/tegra20-colibri-512.dtsi
[...]
> -static inline struct tps6586x_regulator *find_regulator_info(int id)
> +static struct tps6586x_regulator *find_regulator_info(int id, int version)
>  {
>  	struct tps6586x_regulator *ri;
> +	struct tps6586x_regulator *table = NULL;
> +	int num;
>  	int i;
>  
> +	switch (version) {
> +	case TPS658623:
> +		table = tps658623_regulator;
> +		num = ARRAY_SIZE(tps658623_regulator);
> +		break;
> +	case TPS658643:
> +		table = tps658643_regulator;
> +		num = ARRAY_SIZE(tps658643_regulator);
> +		break;
> +	}
> +

I think you still need to check for table to be valid here. Depending on
the version it might still be NULL.

> +	/* Search version specific table first */
> +	for (i = 0; i < num; i++) {
> +		ri = &table[i];
> +		if (ri->desc.id == id)
> +			return ri;
> +	}

So this would need to be wrapped in an "if (table) { }" block.


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