linux-kernel - Re: [RFC PATCH RESEND 2/3] leds: upboard: Add LED support

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Date:   Fri, 27 Apr 2018 08:38:43 +0100
From:   Lee Jones <lee.jones@...aro.org>
To:     Javier Arteaga <javier@...tex.com>
Cc:     Jacek Anaszewski <jacek.anaszewski@...il.com>,
        Pavel Machek <pavel@....cz>, Dan O'Donovan <dan@...tex.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        linux-gpio@...r.kernel.org, linux-leds@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH RESEND 2/3] leds: upboard: Add LED support

On Thu, 26 Apr 2018, Javier Arteaga wrote:

[...]

> > >  static const struct regmap_range upboard_up2_readable_ranges[] = {
> > > @@ -116,7 +124,18 @@ static const struct regmap_config upboard_up2_regmap_config = {
> > >  	.wr_table = &upboard_up2_writable_table,
> > >  };
> > >  
> > > +static struct upboard_led_data upboard_up2_led_data[] = {
> > > +	{ .id = 0, .color = "blue" },
> > > +	{ .id = 1, .color = "yellow" },
> > > +	{ .id = 2, .color = "green" },
> > > +	{ .id = 3, .color = "red" },
> > > +};
> > 
> > How is this data used?
> > 
> > Does it ever change, from board to board?
> 
> This provides indexes into the LED control register, so the leds driver
> knows which regmap bits to flip, and maps them to color names, so it can
> name the led devices accordingly. The mapping does change for each board
> (UP1 has 3 LEDs, UP Core depends on the carrier board).

I think this information should live in the driver which consumes it.

-- 
Lee Jones [李琼斯]
Linaro Services Technical Lead
Linaro.org │ Open source software for ARM SoCs
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