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SubjectRe: [PATCH v2 1/2] pinctrl: ocelot: Fix pincfg for lan966x
On Fri, Jul 8, 2022 at 10:10 PM Horatiu Vultur
<horatiu.vultur@microchip.com> wrote:
>
> The blamed commit introduce support for lan966x which use the same
> pinconf_ops as sparx5. The problem is that pinconf_ops is specific to
> sparx5. More precisely the offset of the bits in the pincfg register are
> different and also lan966x doesn't have support for
> PIN_CONFIG_INPUT_SCHMITT_ENABLE.
>
> Fix this by making pinconf_ops more generic such that it can be also
> used by lan966x. This is done by introducing 'ocelot_pincfg_data' which
> contains the offset and what is supported for each SOC.

...

> +struct ocelot_pincfg_data {
> + bool has_schmitt;
> + u8 schmitt_bit;
> + u8 pd_bit;
> + u8 pu_bit;
> + u8 drive_bits;

I would go with mandatory fields first and leave optional (that is
with boolean flag) at last.

> +};

...

> struct ocelot_pinctrl {
> struct device *dev;
> struct pinctrl_dev *pctl;
> @@ -330,6 +331,12 @@ struct ocelot_pinctrl {
> struct pinctrl_desc *desc;
> struct ocelot_pmx_func func[FUNC_MAX];
> u8 stride;
> + struct ocelot_pincfg_data *pincfg_data;

It might waste too many bytes in some cases. I would recommend moving
it somewhere above, definitely before the u8 member.

> +};

Yes, I understand that for a certain architecture it might be the same
result in sizeof(), the rationale is to make code better in case
somebody copies'n'pastes pieces or ideas from it.

...

> if (param == PIN_CONFIG_BIAS_DISABLE)> val = (val == 0);
> else if (param == PIN_CONFIG_BIAS_PULL_DOWN)
> - val = (val & BIAS_PD_BIT ? true : false);
> + val = (val & info->pincfg_data->pd_bit ? true : false);
> else /* PIN_CONFIG_BIAS_PULL_UP */
> - val = (val & BIAS_PU_BIT ? true : false);
> + val = (val & info->pincfg_data->pu_bit ? true : false);
> break;

> + val = (val & info->pincfg_data->schmitt_bit ? true : false);


!!(val & ...) will be a much shorter equivalent to ternary.

> break;

...

> +static struct ocelot_match_data ocelot_desc = {
> + .desc = {
> + .name = "ocelot-pinctrl",
> + .pins = ocelot_pins,
> + .npins = ARRAY_SIZE(ocelot_pins),
> + .pctlops = &ocelot_pctl_ops,
> + .pmxops = &ocelot_pmx_ops,
> + .owner = THIS_MODULE,
> + }

Please, keep a comma here. It's definitely not a terminating entry, so
it might help in the future.

Ditto for all cases like this.

> };

...

> + struct ocelot_match_data *data;

Any specific reason why this is not const?

...

> + data = (struct ocelot_match_data *)device_get_match_data(dev);

And here you drop the qualifier...

I would recommend making it const and dropping the cast completely.

> + if (!data)
> + return -EINVAL;

--
With Best Regards,
Andy Shevchenko

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