Message-ID: <CA+V-a8vQzBs-Qq0mRyjn_=ciqxna9Fw64dvnQCFF-0xLEx7Fmg@mail.gmail.com>
Date:   Wed, 20 Sep 2023 14:43:55 +0100
From:   "Lad, Prabhakar" <prabhakar.csengg@...il.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Claudiu <claudiu.beznea@...on.dev>,
        prabhakar.mahadev-lad.rj@...renesas.com, mturquette@...libre.com,
        sboyd@...nel.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
        ulf.hansson@...aro.org, linus.walleij@...aro.org,
        gregkh@...uxfoundation.org, jirislaby@...nel.org,
        magnus.damm@...il.com, catalin.marinas@....com, will@...nel.org,
        biju.das.jz@...renesas.com, quic_bjorande@...cinc.com,
        arnd@...db.de, konrad.dybcio@...aro.org, neil.armstrong@...aro.org,
        nfraprado@...labora.com, rafal@...ecki.pl,
        wsa+renesas@...g-engineering.com,
        linux-renesas-soc@...r.kernel.org, linux-clk@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mmc@...r.kernel.org, linux-gpio@...r.kernel.org,
        linux-serial@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
Subject: Re: [PATCH 23/37] pinctrl: renesas: rzg2l: index all registers based
 on port offset

Hi Geert,

On Wed, Sep 20, 2023 at 2:22 PM Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
>
> Hi Claudiu,
>
> Thanks for your patch!
>
> On Tue, Sep 12, 2023 at 6:53 AM Claudiu <claudiu.beznea@...on.dev> wrote:
> > From: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
> >
> > To get address that needs to be read/write for specific port
> > functionalities the P(), PM(), PMC(), PFC(), PIN(), IOLH() IEN(), ISEL()
> > macros are used. Some of these macros received as argument the hardware
> > port identifier, some hardware port offset address (e.g. ISEL() received
> > port identifier, IOLH() received port offset address). This makes hard to
> > extend the current driver for SoCs were port identifiers are not continuous
> > in memory map of pin controller. This is the case for RZ/G3S pin controller
> > were ports are mapped as follows:
> >
> > port offset    port identifier
> > -----------    ---------------
> > 0x20           P0
> > 0x21           P5
> > 0x22           P6
> > 0x23           P11
> > 0x24           P12
> > 0x25           P13
> > 0x26           P14
> > 0x27           P15
> > 0x28           P16
> > 0x29           P17
> > 0x2a           P18
> > 0x30           P1
> > 0x31           P2
> > 0x32           P3
> > 0x33           P4
> > 0x34           P7
> > 0x35           P8
> > 0x36           P8
> > 0x37           P10
> >
> > To make this achievable change all the above macros used to get the address
> > of a port register for specific port functionality based on port hardware
> > address. Shortly, all the above macros will get as argument the port
> > offset address listed in the above table.
> >
> > With this RZG2L_SINGLE_PIN_GET_PORT_OFFSET() and
> > RZG2L_PIN_ID_TO_PORT_OFFSET() were replaced by
>
> and RZG2L_GPIO_PORT_GET_INDEX()?
>
> > RZG2L_PIN_CFG_TO_PORT_OFFSET(), RZG2L_SINGLE_PIN_GET_CFGS() and
> > RZG2L_GPIO_PORT_GET_CFGS() were replaced by RZG2L_PIN_CFG_TO_CAPS().
> >
> > Also rzg2l_pinctrl_set_pfc_mode() don't need port argument anymore.
> > Also rzg2l_gpio_direction_input() and rzg2l_gpio_direction_output() don't
> > need to translate port and bit locally as this can be done by
> > rzg2l_gpio_set_direction().
> >
> > To use the same naming for port, bit/pin and register offset the
> > port_offset variable names in different places was replaced by variable
> > named off and there is no need to initialize anymore cfg and bit in
> > different code places.
> >
> > Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
>
> This looks like a nice cleanup, thanks a lot!
> Prabhakar: do you like it, too?
>
Yes indeed, I loved it when I reviewed it internally. This makes it
easier for me to add those extra port pins present on rz/five ;)

Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Tested-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>

Cheers,
Prabhakar

> Reviewed-by: Geert Uytterhoeven <geert+renesas@...der.be>
> You can find a few suggestions for improvement below...
>
> > --- a/drivers/pinctrl/renesas/pinctrl-rzg2l.c
> > +++ b/drivers/pinctrl/renesas/pinctrl-rzg2l.c
> > @@ -202,9 +202,11 @@ static int rzg2l_pinctrl_set_mux(struct pinctrl_dev *pctldev,
> >                                  unsigned int group_selector)
> >  {
> >         struct rzg2l_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
> > +       const struct pinctrl_pin_desc *pin_desc;
> > +       unsigned int i, *psel_val, *pin_data;
> >         struct function_desc *func;
> > -       unsigned int i, *psel_val;
> >         struct group_desc *group;
> > +       u32 port, pin, off;
>
> Please move the new variable declarations inside the for(), and
> combine them with their initialization.
>
> >         int *pins;
> >
> >         func = pinmux_generic_get_function(pctldev, func_selector);
> > @@ -218,11 +220,17 @@ static int rzg2l_pinctrl_set_mux(struct pinctrl_dev *pctldev,
> >         pins = group->pins;
> >
> >         for (i = 0; i < group->num_pins; i++) {
> > -               dev_dbg(pctrl->dev, "port:%u pin: %u PSEL:%u\n",
> > -                       RZG2L_PIN_ID_TO_PORT(pins[i]), RZG2L_PIN_ID_TO_PIN(pins[i]),
> > -                       psel_val[i]);
> > -               rzg2l_pinctrl_set_pfc_mode(pctrl, RZG2L_PIN_ID_TO_PORT(pins[i]),
> > -                                          RZG2L_PIN_ID_TO_PIN(pins[i]), psel_val[i]);
> > +               pin_desc = &pctrl->desc.pins[pins[i]];
> > +               pin_data = pin_desc->drv_data;
> > +
> > +               port = RZG2L_PIN_ID_TO_PORT(pins[i]);
>
> As port is unused but in the debug print, please drop the variable,
> and use RZG2L_PIN_ID_TO_PORT() in the debug print below.
>
> > +               pin = RZG2L_PIN_ID_TO_PIN(pins[i]);
> > +               off = RZG2L_PIN_CFG_TO_PORT_OFFSET(*pin_data);
> > +
> > +               dev_dbg(pctrl->dev, "port:%u pin: %u off:%x PSEL:%u\n", port,
> > +                       pin, off, psel_val[i]);
> > +
> > +               rzg2l_pinctrl_set_pfc_mode(pctrl, pin, off, psel_val[i]);
> >         }
>
> Gr{oetje,eeting}s,
>
>                         Geert
>
> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org
>
> In personal conversations with technical people, I call myself a hacker. But
> when I'm talking to journalists I just say "programmer" or something like that.
>                                 -- Linus Torvalds
>
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