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 <o...@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.lik...@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
>
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