[RFC 3/5] drivers: boot_constraint: Add boot_constraints_disable kernel parameter

Randy Dunlap
2017-06-28T15:51:10Z

On 06/28/2017 03:26 AM, Viresh Kumar wrote:
> Users must be given an option to discard any constraints set by
> bootloaders. For example, consider that a constraint is set for the LCD
> controller's supply and the LCD driver isn't loaded by the kernel. If
> the user doesn't need to use the LCD device, then he shouldn't be forced
> to honour the constraint.
>
> We can also think about finer control of such constraints with help of
> some sysfs files, but a kernel parameter is fine to begin with.
>
> Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
> ---
> Documentation/admin-guide/kernel-parameters.txt | 2 ++
> drivers/base/boot_constraint.c | 17 +++++++++++++++++
> 2 files changed, 19 insertions(+)
>
> diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
> index 7737ab5d04b2..35e8a298bfc1 100644
> --- a/Documentation/admin-guide/kernel-parameters.txt
> +++ b/Documentation/admin-guide/kernel-parameters.txt
> @@ -426,6 +426,8 @@
> embedded devices based on command line input.
> See Documentation/block/cmdline-partition.txt
>
> + boot_constraints_disable = Do not set any boot constraints for devices.
> +

No '=' sign. That is only used when there is a following parameter value.

> boot_delay= Milliseconds to delay each printk during boot.
> Values larger than 10 seconds (10000) are changed to
> no delay (0).

--
~Randy