On Tue, Apr 10, 2012 at 05:06:27PM +0200, Thierry Reding wrote:
> In order to get rid of the global namespace for PWM devices, this commit
> provides an alternative method, similar to that of the regulator or
> clock frameworks, for registering a static mapping for PWM devices. This
> works by providing a table with a provider/consumer map in the board
> setup code.
>
> With the new pwm_get() and pwm_put() functions available, usage of
> pwm_request() and pwm_free() becomes deprecated.
>
> Signed-off-by: Thierry Reding <thierry.reding@xxxxxxxxxxxxxxxxx>
...
> diff --git a/Documentation/pwm.txt b/Documentation/pwm.txt
> index 48f598a..bb3d2f9 100644
> --- a/Documentation/pwm.txt
> +++ b/Documentation/pwm.txt
> @@ -12,14 +12,33 @@ this kind of flexibility the generic PWM API exists.
> Identifying PWMs
> ----------------
>
> -Users of the legacy PWM API use unique IDs to refer to PWM devices. One
> -goal of the new PWM framework is to get rid of this global namespace.
> +Users of the legacy PWM API use unique IDs to refer to PWM devices.
> +
> +Instead of referring to a PWM device via its unique ID, board setup code
> +should instead register a static mapping that can be used to match PWM
> +consumers to providers, as given in the following example:
> +
> + static struct pwm_lookup board_pwm_lookup[] = {
> + PWM_LOOKUP("tegra-pwm", 0, "pwm-backlight"),
PWM_LOOKUP takes 4 parameters now. Other than that,
Reviewed-by: Shawn Guo <shawn.guo@xxxxxxxxxx>
Regards,
Shawn
> + };
> +
> + static void __init board_init(void)
> + {
> + ...
> + pwm_add_table(board_pwm_lookup, ARRAY_SIZE(board_pwm_lookup));
> + ...
> + }
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