[PATCH v2 1/2] Input: tegra-kbc - add device tree bindings

[Grant Likely]

On Tue, Dec 27, 2011 at 10:19:29PM -0800, Olof Johansson wrote:
> This adds a simple device tree binding to the tegra keyboard controller.
> 
> Also, mark the default keymap as __devinitdata since it is not referenced
> after boot, and shorten the name to not have to avoid line wraps.
> 
> Signed-off-by: Olof Johansson <olof at lixom.net>
> ---
>  .../devicetree/bindings/input/tegra-kbc.txt        |   18 +++++
>  drivers/input/keyboard/tegra-kbc.c                 |   70 ++++++++++++++++++--
>  2 files changed, 83 insertions(+), 5 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/input/tegra-kbc.txt
> 
> diff --git a/Documentation/devicetree/bindings/input/tegra-kbc.txt b/Documentation/devicetree/bindings/input/tegra-kbc.txt
> new file mode 100644
> index 0000000..a7c1d40
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/input/tegra-kbc.txt
> @@ -0,0 +1,18 @@
> +* Tegra keyboard controller
> +
> +Required properties:
> +- compatible : "nvidia,tegra20-kbc"
> +
> +Optional properties:
> +- debounce-delay: delay in milliseconds per row scan for debouncing
> +- repeat-delay: delay in milliseconds before repeat starts
> +- ghost-filter : enable ghost filtering for this device
> +- wakeup-source : configure keyboard as a wakeup source for suspend/resume

I'd like to see a "tegra," prefix on these custom properties, but otherwise
the binding looks okay to me.  You should also consider a '-ms' suffix on
the millisecond properties.

Otherwise;

Acked-by: Grant Likely <grant.likely at secretlab.ca>

> +
> +Example:
> +
> +keyboard: keyboard {
> +	compatible = "nvidia,tegra20-kbc";
> +	reg = <0x7000e200 0x100>;
> +	ghost-filter;
> +};
> diff --git a/drivers/input/keyboard/tegra-kbc.c b/drivers/input/keyboard/tegra-kbc.c
> index cf3228b..4ce6cc8 100644
> --- a/drivers/input/keyboard/tegra-kbc.c
> +++ b/drivers/input/keyboard/tegra-kbc.c
> @@ -26,6 +26,7 @@
>  #include <linux/delay.h>
>  #include <linux/io.h>
>  #include <linux/interrupt.h>
> +#include <linux/of.h>
>  #include <linux/clk.h>
>  #include <linux/slab.h>
>  #include <mach/clk.h>
> @@ -82,7 +83,7 @@ struct tegra_kbc {
>  	struct clk *clk;
>  };
>  
> -static const u32 tegra_kbc_default_keymap[] = {
> +static const u32 default_keymap[] __devinitdata = {
>  	KEY(0, 2, KEY_W),
>  	KEY(0, 3, KEY_S),
>  	KEY(0, 4, KEY_A),
> @@ -217,9 +218,9 @@ static const u32 tegra_kbc_default_keymap[] = {
>  	KEY(31, 4, KEY_HELP),
>  };
>  
> -static const struct matrix_keymap_data tegra_kbc_default_keymap_data = {
> -	.keymap		= tegra_kbc_default_keymap,
> -	.keymap_size	= ARRAY_SIZE(tegra_kbc_default_keymap),
> +static const struct matrix_keymap_data default_keymap_data __devinitdata = {
> +	.keymap		= default_keymap,
> +	.keymap_size	= ARRAY_SIZE(default_keymap),
>  };
>  
>  static void tegra_kbc_report_released_keys(struct input_dev *input,
> @@ -576,6 +577,55 @@ tegra_kbc_check_pin_cfg(const struct tegra_kbc_platform_data *pdata,
>  	return true;
>  }
>  
> +#ifdef CONFIG_OF
> +static struct tegra_kbc_platform_data * __devinit tegra_kbc_dt_parse_pdata(
> +	struct platform_device *pdev)
> +{
> +	struct tegra_kbc_platform_data *pdata;
> +	struct device_node *np = pdev->dev.of_node;
> +	int i;
> +	u32 prop;
> +
> +	if (!np)
> +		return NULL;
> +
> +	pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
> +
> +	if (!of_property_read_u32(np, "debounce-delay", &prop))
> +		pdata->debounce_cnt = prop;
> +
> +	if (!of_property_read_u32(np, "repeat-delay", &prop))
> +		pdata->repeat_cnt = prop;
> +
> +	if (of_find_property(np, "needs-ghost-filter", NULL))
> +		pdata->use_ghost_filter = true;
> +
> +	if (of_find_property(np, "wakeup-source", NULL))
> +		pdata->wakeup = true;
> +
> +	/* All currently known keymaps with device tree support use the same
> +	 * pin_cfg, so set it up here.
> +	 */
> +	for (i = 0; i < KBC_MAX_ROW; i++) {
> +		pdata->pin_cfg[i].num = i;
> +		pdata->pin_cfg[i].is_row = true;
> +	}
> +	
> +	for (i = 0; i < KBC_MAX_COL; i++) {
> +		pdata->pin_cfg[KBC_MAX_ROW + i].num = i;
> +		pdata->pin_cfg[KBC_MAX_ROW + i].is_row = false;
> +	}
> +
> +	return pdata;
> +}
> +#else
> +static inline struct tegra_kbc_platform_data *tegra_kbc_dt_parse_pdata(
> +	struct platform_device *pdev)
> +{
> +	return NULL;
> +}
> +#endif
> +
>  static int __devinit tegra_kbc_probe(struct platform_device *pdev)
>  {
>  	const struct tegra_kbc_platform_data *pdata = pdev->dev.platform_data;
> @@ -590,6 +640,9 @@ static int __devinit tegra_kbc_probe(struct platform_device *pdev)
>  	unsigned int scan_time_rows;
>  
>  	if (!pdata)
> +		pdata = tegra_kbc_dt_parse_pdata(pdev);
> +
> +	if (!pdata)
>  		return -EINVAL;
>  
>  	if (!tegra_kbc_check_pin_cfg(pdata, &pdev->dev, &num_rows))
> @@ -671,7 +724,7 @@ static int __devinit tegra_kbc_probe(struct platform_device *pdev)
>  
>  	kbc->use_fn_map = pdata->use_fn_map;
>  	kbc->use_ghost_filter = pdata->use_ghost_filter;
> -	keymap_data = pdata->keymap_data ?: &tegra_kbc_default_keymap_data;
> +	keymap_data = pdata->keymap_data ?: &default_keymap_data;
>  	matrix_keypad_build_keymap(keymap_data, KBC_ROW_SHIFT,
>  				   input_dev->keycode, input_dev->keybit);
>  
> @@ -793,6 +846,12 @@ static int tegra_kbc_resume(struct device *dev)
>  
>  static SIMPLE_DEV_PM_OPS(tegra_kbc_pm_ops, tegra_kbc_suspend, tegra_kbc_resume);
>  
> +static const struct of_device_id tegra_kbc_of_match[] = {
> +	{ .compatible = "nvidia,tegra20-kbc", },
> +	{ },
> +};
> +MODULE_DEVICE_TABLE(of, tegra_kbc_of_match);
> +
>  static struct platform_driver tegra_kbc_driver = {
>  	.probe		= tegra_kbc_probe,
>  	.remove		= __devexit_p(tegra_kbc_remove),
> @@ -800,6 +859,7 @@ static struct platform_driver tegra_kbc_driver = {
>  		.name	= "tegra-kbc",
>  		.owner  = THIS_MODULE,
>  		.pm	= &tegra_kbc_pm_ops,
> +		.of_match_table = tegra_kbc_of_match,
>  	},
>  };
>  
> -- 
> 1.7.8.GIT
>