[PATCH v4 6/7] cmd: Add a mux command

[Tom Rini <trini@konsulko.com>]

On Fri, Oct 16, 2020 at 04:16:35PM +0530, Pratyush Yadav wrote:

> This command lets the user list, select, and deselect mux controllers
> introduced with the mux framework on the fly. It has 3 subcommands:
> list, select, and deselect.
> 
> List: Lists all the mux present on the system. The muxes are listed for
> each chip. The chip is identified by its device name. Each chip can have
> a number of mux controllers. Each is listed in sequence and is assigned
> a sequential ID based on its position in the mux chip. It lists details
> like ID, whether the mux is currently selected or not, the current
> state, the idle state, and the number of states.
> 
> A sample output would look something like:
> 
> => mux list
> a-mux-controller:
> 	ID	Selected	Current State	Idle State	Num States
> 	0	no        	unknown   	as-is     	0x4
> 	1	no        	0x2       	0x2       	0x10
> 	2	no        	0x73      	0x73      	0x100
> 
> another-mux-controller:
> 	ID	Selected	Current State	Idle State	Num States
>         0       no              0x1             0x1             0x4
>         1       no              0x2             0x2             0x4
> 
> Select: Selects a given mux and puts it in the specified state. This
> subcommand takes 3 arguments: mux chip, mux ID, state to set
> the mux in. The arguments mux chip and mux ID are used to identify which
> mux needs to be selected, and then it is selected to the given state.
> The mux needs to be deselected before it can be selected again in
> another state. The state should be a hexadecimal number.
> 
> For example:
> => mux list
> a-mux-controller:
>         ID      Selected        Current State   Idle State      Num States
>         0       no              0x1             0x1             0x4
>         1       no              0x1             0x1             0x4
> => mux select a-mux-controller 0 0x3
> => mux list
> a-mux-controller:
>         ID      Selected        Current State   Idle State      Num States
>         0       yes             0x3             0x1             0x4
>         1       no              0x1             0x1             0x4
> 
> Deselect: Deselects a given mux and puts it in its idle state. This
> subcommand takes 2 arguments: the mux chip and mux ID to identify which
> mux needs to be deselected. So in the above example, we can deselect mux
> 0 using:
> 
> => mux deselect a-mux-controller 0
> => mux list
> a-mux-controller:
>         ID      Selected        Current State   Idle State      Num States
>         0       no              0x1             0x1             0x4
>         1       no              0x1             0x1             0x4
> 
> Signed-off-by: Pratyush Yadav <p.yadav@ti.com>
> Reviewed-by: Simon Glass <sjg@chromium.org>

Applied to u-boot/master, thanks!

-- 
Tom
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