linux-kernel - Re: [PATCH] input: keyboard: tegra: support for defining row/columns based on SoC

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Date:	Tue, 12 Mar 2013 12:09:26 -0600
From:	Stephen Warren <swarren@...dotorg.org>
To:	Laxman Dewangan <ldewangan@...dia.com>
CC:	dmitry.torokhov@...il.com, linux-input@...r.kernel.org,
	linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] input: keyboard: tegra: support for defining row/columns
 based on SoC

On 03/12/2013 05:36 AM, Laxman Dewangan wrote:
> NVIDIA's Tegra20 and Tegra30 supports the 16x8 keyboard matrix and T114
> support the 11x8 Key matrix.
> 
> Add support for defining the maximum row/columns based on SoC through
> proper compatibity.

Aside from the few nits below,
Reviewed-by: Stephen Warren <swarren@...dia.com>

> diff --git a/drivers/input/keyboard/tegra-kbc.c b/drivers/input/keyboard/tegra-kbc.c

> @@ -108,6 +115,9 @@ struct tegra_kbc {
>  	u32 wakeup_key;
>  	struct timer_list timer;
>  	struct clk *clk;
> +	const struct tegra_kbc_hw_support *hw_support;
> +	int max_keys;
> +	int max_row_columns;

That isn't really max_row_columns, that's num_gpios or perhaps
num_rows_and_columns.

> +	if (num_cols > kbc->hw_support->max_columns) {
> +		dev_err(kbc->dev,
> +			"Number of column is more than supported on SoCs\n");

That's be slightly better as:

Number of columns is more than supported by this hardware.

Similar for the row check above.

> @@ -579,6 +622,12 @@ static int tegra_kbc_probe(struct platform_device *pdev)
>  	}
>  
>  	kbc->dev = &pdev->dev;
> +	kbc->hw_support = match->data;
> +	kbc->max_keys = (kbc->hw_support->max_rows *
> +				kbc->hw_support->max_columns);
> +	kbc->max_row_columns = (kbc->hw_support->max_rows +
> +					kbc->hw_support->max_columns);

You don't need the () around either of those expressions.
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