linux-kernel - RE: [RFC PATCH 1/4] pinctrl: renesas: rzg2l: Include pinmap in RZG2L_GPIO_PORT

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Date:   Mon, 3 Jul 2023 14:13:15 +0000
From:   Biju Das <biju.das.jz@...renesas.com>
To:     "Lad, Prabhakar" <prabhakar.csengg@...il.com>
CC:     Geert Uytterhoeven <geert+renesas@...der.be>,
        Magnus Damm <magnus.damm@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        "linux-renesas-soc@...r.kernel.org" 
        <linux-renesas-soc@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-riscv@...ts.infradead.org" <linux-riscv@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
        Prabhakar Mahadev Lad <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: RE: [RFC PATCH 1/4] pinctrl: renesas: rzg2l: Include pinmap in
 RZG2L_GPIO_PORT_PACK() macro

Hi Prabhakar,

> -----Original Message-----
> From: Lad, Prabhakar <prabhakar.csengg@...il.com>
> Sent: Monday, July 3, 2023 1:43 PM
> To: Biju Das <biju.das.jz@...renesas.com>
> Cc: Geert Uytterhoeven <geert+renesas@...der.be>; Magnus Damm
> <magnus.damm@...il.com>; Rob Herring <robh+dt@...nel.org>; Krzysztof
> Kozlowski <krzysztof.kozlowski+dt@...aro.org>; Linus Walleij
> <linus.walleij@...aro.org>; linux-renesas-soc@...r.kernel.org;
> devicetree@...r.kernel.org; linux-riscv@...ts.infradead.org; linux-
> kernel@...r.kernel.org; linux-gpio@...r.kernel.org; Prabhakar Mahadev
> Lad <prabhakar.mahadev-lad.rj@...renesas.com>
> Subject: Re: [RFC PATCH 1/4] pinctrl: renesas: rzg2l: Include pinmap in
> RZG2L_GPIO_PORT_PACK() macro
> 
> Hi Biju,
> 
> Thank you for the review.
> 
> On Mon, Jul 3, 2023 at 12:42 PM Biju Das <biju.das.jz@...renesas.com>
> wrote:
> >
> > Hi Prabhakar,
> >
> > Thanks for the patch.
> >
> > > -----Original Message-----
> > > From: Prabhakar <prabhakar.csengg@...il.com>
> > > Sent: Friday, June 30, 2023 1:05 PM
> > > To: Geert Uytterhoeven <geert+renesas@...der.be>; Magnus Damm
> > > <magnus.damm@...il.com>
> > > Cc: Rob Herring <robh+dt@...nel.org>; Krzysztof Kozlowski
> > > <krzysztof.kozlowski+dt@...aro.org>; Linus Walleij
> > > <linus.walleij@...aro.org>; linux-renesas-soc@...r.kernel.org;
> > > devicetree@...r.kernel.org; linux-riscv@...ts.infradead.org; linux-
> > > kernel@...r.kernel.org; linux-gpio@...r.kernel.org; Biju Das
> > > <biju.das.jz@...renesas.com>; Prabhakar
> > > <prabhakar.csengg@...il.com>; Prabhakar Mahadev Lad
> > > <prabhakar.mahadev-lad.rj@...renesas.com>
> > > Subject: [RFC PATCH 1/4] pinctrl: renesas: rzg2l: Include pinmap in
> > > RZG2L_GPIO_PORT_PACK() macro
> > >
> > > From: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> > >
> > > Currently we assume all the port pins are sequential ie always PX_0
> > > to PX_n (n=1..7) exist, but on RZ/Five SoC we have additional pins
> > > P19_1 to
> > > P28_5 which have holes in them, for example only one pin on port19
> > > is available and that is P19_1 and not P19_0.
> > >
> > > So to handle such cases include pinmap for each port which would
> > > indicate the pin availability on each port. With this we also get
> > > additional pin validation, for example on the RZ/G2L SOC P0 has two
> > > pins
> > > P0_1 and P0_0 but with DT/SYSFS could use the P0_2-P0_7.
> > >
> > > While at it, update rzg2l_validate_gpio_pin() to use the port pinmap
> > > to validate the gpio pin.
> > >
> > > Signed-off-by: Lad Prabhakar
> > > <prabhakar.mahadev-lad.rj@...renesas.com>
> > > ---
> > >  drivers/pinctrl/renesas/pinctrl-rzg2l.c | 167
> > > ++++++++++++------------
> > >  1 file changed, 86 insertions(+), 81 deletions(-)
> > >
> > > diff --git a/drivers/pinctrl/renesas/pinctrl-rzg2l.c
> > > b/drivers/pinctrl/renesas/pinctrl-rzg2l.c
> > > index 9511d920565e..a0c2e585e765 100644
> > > --- a/drivers/pinctrl/renesas/pinctrl-rzg2l.c
> > > +++ b/drivers/pinctrl/renesas/pinctrl-rzg2l.c
> > > @@ -67,10 +67,12 @@
> > >                                        PIN_CFG_FILCLKSEL)
> > >
> > >  /*
> > > - * n indicates number of pins in the port, a is the register index
> > > - * and f is pin configuration capabilities supported.
> > > + * m indicates the bitmap of supported pins, n indicates number
> > > + * of pins in the port, a is the register index and f is pin
> > > + * configuration capabilities supported.
> > >   */
> > > -#define RZG2L_GPIO_PORT_PACK(n, a, f)        (((n) << 28) | ((a) <<
> 20) |
> > > (f))
> > > +#define RZG2L_GPIO_PORT_PACK(m, n, a, f)     ((UL(m) << 32) |
> (UL(n) << 28)
> > > | ((a) << 20) | (f))
> >
> > I guess, you can still achieve RZG2L_GPIO_PORT_PACK(n, a, f) with
> > ((UL(PINMAP(n)) << 32) | (UL(n) << 28) | ((a) << 20) | (f))
> >
> > #define PINMAP(n) GENMASK(n,0) ?? Then you don't need to modify
> rzg2l_gpio_configs.
> >
> Good point, but this would work if port pins didn't have any holes.
> For example on RZ/Five port P19 we have P19_1 pin only and P19_0 is not
> available (and similarly for port P25 we have P25_1).

Maybe introduce a helper macro to address this case.

#define RZG2L_GPIO_PORT_PACK_WITH_HOLES(m, n, a, f) for these 2 cases

and use RZG2L_GPIO_PORT_PACK(n, a, f) for the one without holes.

Cheers,
Biju