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

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Message-ID: <CA+V-a8t3PveWo==GQNPWV3cTAQebtsgKwrFvc5qJVc_RsBKcGA@mail.gmail.com>
Date:   Tue, 4 Jul 2023 09:47:43 +0100
From:   "Lad, Prabhakar" <prabhakar.csengg@...il.com>
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" 
        <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

On Tue, Jul 4, 2023 at 9:42 AM Biju Das <biju.das.jz@...renesas.com> wrote:
>
> Hi Prabhakar,
>
> > -----Original Message-----
> > From: Lad, Prabhakar <prabhakar.csengg@...il.com>
> > Sent: Tuesday, July 4, 2023 9:36 AM
> > 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,
> >
> > On Tue, Jul 4, 2023 at 9:30 AM Biju Das <biju.das.jz@...renesas.com>
> > wrote:
> > >
> > > Hi Prabhakar,
> > >
> > > > -----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(
>
> , 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))
> > > > +#define RZG2L_GPIO_PORT_GET_PINMAP(x)        (((x) & GENMASK(39,
> > 32)) >> 32)
> > > >  #define RZG2L_GPIO_PORT_GET_PINCNT(x)        (((x) & GENMASK(30,
> > 28)) >> 28)
> > > >  #define RZG2L_GPIO_PORT_GET_INDEX(x) (((x) & GENMASK(26, 20)) >>
> > > > 20)  #define RZG2L_GPIO_PORT_GET_CFGS(x)  ((x) & GENMASK(19, 0)) @@
> > > > -129,7 +131,7 @@ struct rzg2l_dedicated_configs {
> > > >
> > > >  struct rzg2l_pinctrl_data {
> > > >       const char * const *port_pins;
> > > > -     const u32 *port_pin_configs;
> > > > +     const u64 *port_pin_configs;
> > >
> > > Can this be SoC specific? Only for RZ/Five you need this changes.
> > > Others SoCs like RZ/{G2L,G2LC,V2L and G2UL) still work with u32* as
> > > there is no holes. With this change memory usage is doubled as we
> > > change from
> > > u32->u64.
> > >
> > This is to avoid writing to undocumented registers so I have added for
> > all the SoCs. For example on the RZ/G2L SOC P0 has two pins P0_1 and
> > P0_0 but DT/SYSFS could use the P0_2-P0_7. This patch restricts users to
> > use only available GPIO pins.
>
> I guess that still can be achieved, as the below macro has valid
> pins info??
>
> #define RZG2L_GPIO_PORT_GET_PINCNT(x)   (((x) & GENMASK(30, 28)) >> 28)
>
> if (!(BIT(bit) & GENMASK(RZG2L_GPIO_PORT_GET_PINCNT(x), 0))
> return -EINVAL;
>
Agreed, If Geert is OK to have SoC specific checks around I'll do the above.

Cheers,
Prabhakar