linux-kernel - Re: [PATCH v5 2/3] pinctrl: qcom: Refactor target specific pinctrl driver

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Message-ID: <CAHp75VegxMgAamS3ORiJ2=D4MH7asD9PiWrM+3JAm-QOuEgcrg@mail.gmail.com>
Date:   Wed, 3 May 2023 12:41:56 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Rohit Agarwal <quic_rohiagar@...cinc.com>
Cc:     agross@...nel.org, andersson@...nel.org, konrad.dybcio@...aro.org,
        linus.walleij@...aro.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, richardcochran@...il.com,
        manivannan.sadhasivam@...aro.org, linux-arm-msm@...r.kernel.org,
        linux-gpio@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH v5 2/3] pinctrl: qcom: Refactor target specific pinctrl driver

On Wed, May 3, 2023 at 8:39 AM Rohit Agarwal <quic_rohiagar@...cinc.com> wrote:
>
> Update the msm_function and msm_pingroup structure to reuse the generic

structures

> pinfunction and pingroup structures. Also refactor pinctrl drivers to adjust
> the new macro and updated structure defined in pinctrl.h and pinctrl_msm.h
> respectively.

Thanks for this, my comments below.

...

>  #define FUNCTION(fname)                                        \
>         [APQ_MUX_##fname] = {                           \
> -               .name = #fname,                         \
> -               .groups = fname##_groups,               \
> -               .ngroups = ARRAY_SIZE(fname##_groups),  \
> -       }
> +               .func = PINCTRL_PINFUNCTION(#fname,                     \
> +                                       fname##_groups,                 \
> +                                       ARRAY_SIZE(fname##_groups))             \
> +                       }

Does it really make sense to keep an additional wrapper data type that
does not add any value? Can't we simply have

  #define FUNCTION(fname)      [...fname] = PINCTRL_PINFUNCTION(...)

?

...

> +               .grp = PINCTRL_PINGROUP("gpio"#id, gpio##id##_pins,     \
> +                       (unsigned int)ARRAY_SIZE(gpio##id##_pins)),     \

Why do you need this casting? Same Q to all the rest of the similar cases.

...

> +#include <linux/pinctrl/pinctrl.h>

Keep it separate, and below the generic ones...

>  #include <linux/pm.h>
>  #include <linux/types.h>
>

...like here (note also a blank line).

...

>  /**
>   * struct msm_function - a pinmux function
> - * @name:    Name of the pinmux function.
> - * @groups:  List of pingroups for this function.
> - * @ngroups: Number of entries in @groups.
> + * @func: Generic data of the pin function (name and groups of pins)
>   */
>  struct msm_function {
> -       const char *name;
> -       const char * const *groups;
> -       unsigned ngroups;
> +       struct pinfunction func;
>  };

But why? Just kill the entire structure.

...

>  #define FUNCTION(fname)                                        \

This definition appears in many files, instead you can make a generic
to this drivers one and use it here

#define QCOM_FUNCTION(_prefix_, _fname_)
  [_prefix_##_fname_] = PINCTRL_PINFUNCTION(...)

#define FUNCTION(fname) QCOM_FUNCTION(msm_mux, fname)

(this just a pseudocode, might not even be compilable)

>         [msm_mux_##fname] = {                           \
> -               .name = #fname,                         \
> -               .groups = fname##_groups,               \
> -               .ngroups = ARRAY_SIZE(fname##_groups),  \
> +               .func = PINCTRL_PINFUNCTION(#fname,                     \
> +                                       fname##_groups,                 \
> +                                       ARRAY_SIZE(fname##_groups))             \
>         }

-- 
With Best Regards,
Andy Shevchenko