linux-kernel - Re: [PATCH 2/5] irqchip/renesas-rzg2l: Add support for RZ/Five SoC

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Message-ID: <CAMuHMdV7Q4kMv1pFVNBf5oYF=_W_snp=5GKLpr9+OxeqxywhBw@mail.gmail.com>
Date: Tue, 30 Jan 2024 12:38:01 +0100
From: Geert Uytterhoeven <geert@...ux-m68k.org>
To: Prabhakar <prabhakar.csengg@...il.com>
Cc: Thomas Gleixner <tglx@...utronix.de>, Rob Herring <robh+dt@...nel.org>, 
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, Conor Dooley <conor+dt@...nel.org>, 
	Magnus Damm <magnus.damm@...il.com>, linux-renesas-soc@...r.kernel.org, 
	devicetree@...r.kernel.org, linux-riscv@...ts.infradead.org, 
	linux-kernel@...r.kernel.org, Biju Das <biju.das.jz@...renesas.com>, 
	Claudiu Beznea <claudiu.beznea.uj@...renesas.com>, 
	Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: Re: [PATCH 2/5] irqchip/renesas-rzg2l: Add support for RZ/Five SoC

Hi Prabhakar,

On Mon, Jan 29, 2024 at 4:16 PM Prabhakar <prabhakar.csengg@...il.com> wrote:
> From: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
>
> The IX45 block has additional mask registers (NMSK/IMSK/TMSK) as compared
> to the RZ/G2L (family) SoC.
>
> Introduce masking/unmasking support for IRQ and TINT interrupts in IRQC
> controller driver. Two new registers, IMSK and TMSK, are defined to
> handle masking on RZ/Five SoC. The implementation utilizes a new data
> structure, `struct rzg2l_irqc_data`, to determine mask support for a
> specific controller instance.
>
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>

Thanks for your patch!

> --- a/drivers/irqchip/irq-renesas-rzg2l.c
> +++ b/drivers/irqchip/irq-renesas-rzg2l.c
> @@ -66,15 +68,25 @@ struct rzg2l_irqc_reg_cache {
>         u32     titsr[2];
>  };
>
> +/**
> + * struct rzg2l_irqc_data - OF data structure
> + * @mask_supported: Indicates if mask registers are available
> + */
> +struct rzg2l_irqc_data {

This structure has the same name as the single static struct
rzg2l_irqc_priv instance, which is confusing.

> +       bool    mask_supported;
> +};
> +
>  /**
>   * struct rzg2l_irqc_priv - IRQ controller private data structure
>   * @base:      Controller's base address
> + * @data:      OF data pointer
>   * @fwspec:    IRQ firmware specific data
>   * @lock:      Lock to serialize access to hardware registers
>   * @cache:     Registers cache for suspend/resume
>   */
>  static struct rzg2l_irqc_priv {
>         void __iomem                    *base;
> +       const struct rzg2l_irqc_data    *data;

Replacing this by a bool would avoid a pointer dereference in each user,
and allows you to make rzg2l_irqc_data etc. __initconst.

>         struct irq_fwspec               fwspec[IRQC_NUM_IRQ];
>         raw_spinlock_t                  lock;
>         struct rzg2l_irqc_reg_cache     cache;

> @@ -371,9 +475,23 @@ static int rzg2l_irqc_parse_interrupts(struct rzg2l_irqc_priv *priv,
>         return 0;
>  }
>
> +static const struct rzg2l_irqc_data rzfive_irqc_data = {
> +       .mask_supported = true,
> +};
> +
> +static const struct rzg2l_irqc_data rzg2l_irqc_default_data = {
> +       .mask_supported = false,
> +};
> +
> +static const struct of_device_id rzg2l_irqc_matches[] = {
> +       { .compatible = "renesas,r9a07g043f-irqc", .data = &rzfive_irqc_data },
> +       { }
> +};
> +
>  static int rzg2l_irqc_init(struct device_node *node, struct device_node *parent)
>  {
>         struct irq_domain *irq_domain, *parent_domain;
> +       const struct of_device_id *match;
>         struct platform_device *pdev;
>         struct reset_control *resetn;
>         int ret;
> @@ -392,6 +510,12 @@ static int rzg2l_irqc_init(struct device_node *node, struct device_node *parent)
>         if (!rzg2l_irqc_data)
>                 return -ENOMEM;
>
> +       match = of_match_node(rzg2l_irqc_matches, node);
> +       if (match)
> +               rzg2l_irqc_data->data = match->data;
> +       else
> +               rzg2l_irqc_data->data = &rzg2l_irqc_default_data;

Instead of matching a second time, I'd rather add a second
IRQCHIP_MATCH() entry with a different init function, passing the
actual rzg2l_irqc_data pointer.

> +
>         rzg2l_irqc_data->base = devm_of_iomap(&pdev->dev, pdev->dev.of_node, 0, NULL);
>         if (IS_ERR(rzg2l_irqc_data->base))
>                 return PTR_ERR(rzg2l_irqc_data->base);

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68korg

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