linux-kernel - Re: [PATCH v2 1/2] pinctrl: generic: add API to solve generic sub-node property name

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Date:   Wed, 2 May 2018 14:56:44 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Matheus Castello <matheus@...tello.eng.br>
Cc:     kbuild-all@...org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 1/2] pinctrl: generic: add API to solve generic
 sub-node property name

On Tue, May 1, 2018 at 9:10 PM, Matheus Castello
<matheus@...tello.eng.br> wrote:

> Set dt_params with the definitions of the generic sub-node properties
> global in pinconf-generic.h and add a function to pinconf-generic API
> to decode a packed param returning the string name from sub-node
> property.
>
> This can be useful in debug from pinctrl-vendor driver or even for
> debug in pinconf driver.
>
> Signed-off-by: Matheus Castello <matheus@...tello.eng.br>

(...)

> +const char *pinconf_generic_get_param_property_name(struct pinctrl_dev *pctldev,
> +       unsigned int num_configs, unsigned long *param)
> +{
> +       struct pinctrl_desc *desc = pctldev->desc;
> +       unsigned int num_params = ARRAY_SIZE(pinconf_dt_params),
> +               num_custom_params = desc->num_custom_params,
> +               i, j;
> +
> +       for (i = 0; i < num_configs; i++) {
> +               enum pin_config_param pin_param =
> +               pinconf_to_config_param(param[i]);
> +
> +               /* first search on default properties */
> +               for (j = 0; j < num_params; j++) {
> +                       if (pin_param == pinconf_dt_params[j].param)
> +                               return pinconf_dt_params[j].property;
> +               }

If this is only for OF, we should rename the function to something including
*of* as well.

I would like it if you manage to break the dependency to OF though.

> +++ b/include/linux/pinctrl/pinconf-generic.h
>
> +static const struct pinconf_generic_params pinconf_dt_params[] = {
> +       { "bias-bus-hold", PIN_CONFIG_BIAS_BUS_HOLD, 0 },
> +       { "bias-disable", PIN_CONFIG_BIAS_DISABLE, 0 },
> +       { "bias-high-impedance", PIN_CONFIG_BIAS_HIGH_IMPEDANCE, 0 },
(...)

Is it really advisible to put big static constant arrays into header
files like this?

This will end up with a copy in each file where it is included and it is not a
small thing that gets replicated all over the place either.

What about just add it as extern and exporting the symbol if you
need it elsewhere?

Yours,
Linus Walleij