linux-kernel - Re: [PATCH] soc: renesas: Add support for reading product revision for RZ/G2L family

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Date:   Thu, 20 Jan 2022 09:45:03 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Cc:     Magnus Damm <magnus.damm@...il.com>,
        Biju Das <biju.das.jz@...renesas.com>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] soc: renesas: Add support for reading product revision
 for RZ/G2L family

Hi Prabhakar,

On Mon, Dec 20, 2021 at 6:04 PM Lad Prabhakar
<prabhakar.mahadev-lad.rj@...renesas.com> wrote:
> From: Biju Das <biju.das.jz@...renesas.com>
>
> As per RZ/G2L HW manual (Rev.1.00 Sep, 2021) DEV_ID [31:28] indicates
> product revision. Use this information to populate the revision info
> for RZ/G2L family.
>
> Signed-off-by: Biju Das <biju.das.jz@...renesas.com>
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>

Thanks for your patch!

> Below is the log from Renesas RZ/G2L SMARC EVK:
>
> root@...rc-rzg2l:~#
> at /sys/devices/soc0/$i; donemachine family soc_id revision; do echo -n "$i: ";ca

This looks a bit mangled ;-)

> machine: Renesas SMARC EVK based on r9a07g044l2
> family: RZ/G2L
> soc_id: r9a07g044
> revision: Rev 1
> root@...rc-rzg2l:~#
>
> Cheers,
> Prabhakar
> ---
>  drivers/soc/renesas/renesas-soc.c | 31 +++++++++++++++++--------------
>  1 file changed, 17 insertions(+), 14 deletions(-)
>
> diff --git a/drivers/soc/renesas/renesas-soc.c b/drivers/soc/renesas/renesas-soc.c
> index 8f82749f182f..6ecd2763d100 100644
> --- a/drivers/soc/renesas/renesas-soc.c
> +++ b/drivers/soc/renesas/renesas-soc.c
> @@ -416,6 +416,17 @@ static int __init renesas_soc_init(void)
>                 chipid = ioremap(family->reg, 4);
>         }
>
> +       soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);

This is not freed in case of SoC mismatch error below.

> +       if (!soc_dev_attr)
> +               return -ENOMEM;
> +
> +       np = of_find_node_by_path("/");
> +       of_property_read_string(np, "model", &soc_dev_attr->machine);
> +       of_node_put(np);
> +
> +       soc_dev_attr->family = kstrdup_const(family->name, GFP_KERNEL);
> +       soc_dev_attr->soc_id = kstrdup_const(soc_id, GFP_KERNEL);
> +
>         if (chipid) {
>                 product = readl(chipid + id->offset);
>                 iounmap(chipid);
> @@ -430,6 +441,12 @@ static int __init renesas_soc_init(void)
>
>                         eshi = ((product >> 4) & 0x0f) + 1;
>                         eslo = product & 0xf;
> +                       soc_dev_attr->revision = kasprintf(GFP_KERNEL, "ES%u.%u",
> +                                                          eshi, eslo);
> +               }  else if (id == &id_rzg2l) {
> +                       eshi =  ((product >> 28) & 0x0f);
> +                       soc_dev_attr->revision = kasprintf(GFP_KERNEL, "Rev %u",
> +                                                          eshi);

These are not freed in case of SoC mismatch error below.

>                 }
>
>                 if (soc->id &&
> @@ -439,20 +456,6 @@ static int __init renesas_soc_init(void)
>                 }
>         }
>
> -       soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
> -       if (!soc_dev_attr)
> -               return -ENOMEM;
> -
> -       np = of_find_node_by_path("/");
> -       of_property_read_string(np, "model", &soc_dev_attr->machine);
> -       of_node_put(np);
> -
> -       soc_dev_attr->family = kstrdup_const(family->name, GFP_KERNEL);
> -       soc_dev_attr->soc_id = kstrdup_const(soc_id, GFP_KERNEL);
> -       if (eshi)
> -               soc_dev_attr->revision = kasprintf(GFP_KERNEL, "ES%u.%u", eshi,
> -                                                  eslo);
> -
>         pr_info("Detected Renesas %s %s %s\n", soc_dev_attr->family,
>                 soc_dev_attr->soc_id, soc_dev_attr->revision ?: "");

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