linux-kernel - Re: [PATCH v2 2/6] irqchip/sunxi-nmi: Add support for the V3s NMI

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Date:   Wed, 4 Nov 2020 22:14:47 -0600
From:   Samuel Holland <samuel@...lland.org>
To:     Paul Kocialkowski <contact@...lk.fr>, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     Rob Herring <robh+dt@...nel.org>,
        Maxime Ripard <mripard@...nel.org>,
        Chen-Yu Tsai <wens@...e.org>, Icenowy Zheng <icenowy@...c.io>,
        Matteo Scordino <matteo.scordino@...il.com>
Subject: Re: [PATCH v2 2/6] irqchip/sunxi-nmi: Add support for the V3s NMI

On 11/3/20 2:50 PM, Paul Kocialkowski wrote:
> The V3s/V3 has a NMI IRQ controller, which is mainly used for the AXP209
> interrupt. In great wisdom, Allwinner decided to invert the enable and
> pending register offsets, compared to the A20.
> 
> As a result, a specific compatible and register description is required
> for the V3s. This was tested with an AXP209 on a V3 board.
> 
> Acked-by: Maxime Ripard <mripard@...nel.org>
> Signed-off-by: Paul Kocialkowski <contact@...lk.fr>
> ---
>  drivers/irqchip/irq-sunxi-nmi.c | 18 +++++++++++++++++-
>  1 file changed, 17 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/irqchip/irq-sunxi-nmi.c b/drivers/irqchip/irq-sunxi-nmi.c
> index a412b5d5d0fa..59e0e4612ef7 100644
> --- a/drivers/irqchip/irq-sunxi-nmi.c
> +++ b/drivers/irqchip/irq-sunxi-nmi.c
> @@ -44,6 +44,10 @@
>  #define SUN7I_NMI_PENDING	0x04
>  #define SUN7I_NMI_ENABLE	0x08
>  
> +#define SUN8I_V3S_NMI_CTRL	0x00
> +#define SUN8I_V3S_NMI_ENABLE	0x04
> +#define SUN8I_V3S_NMI_PENDING	0x08
> +
>  #define SUN9I_NMI_CTRL		0x00
>  #define SUN9I_NMI_ENABLE	0x04
>  #define SUN9I_NMI_PENDING	0x08

These two sets of definitions are the same. So it would make sense for
V3S and sun9i to share a configuration, instead of creating a copy.

> @@ -79,6 +83,12 @@ static const struct sunxi_sc_nmi_reg_offs sun7i_reg_offs __initconst = {
>  	.enable	= SUN7I_NMI_ENABLE,
>  };
>  
> +static const struct sunxi_sc_nmi_reg_offs sun8i_v3s_reg_offs __initconst = {
> +	.ctrl	= SUN8I_V3S_NMI_CTRL,
> +	.pend	= SUN8I_V3S_NMI_PENDING,
> +	.enable	= SUN8I_V3S_NMI_ENABLE,
> +};
> +
>  static const struct sunxi_sc_nmi_reg_offs sun9i_reg_offs __initconst = {
>  	.ctrl	= SUN9I_NMI_CTRL,
>  	.pend	= SUN9I_NMI_PENDING,
> @@ -165,7 +175,6 @@ static int __init sunxi_sc_nmi_irq_init(struct device_node *node,
>  	unsigned int clr = IRQ_NOREQUEST | IRQ_NOPROBE | IRQ_NOAUTOEN;
>  	int ret;
>  
> -
>  	domain = irq_domain_add_linear(node, 1, &irq_generic_chip_ops, NULL);
>  	if (!domain) {
>  		pr_err("Could not register interrupt domain.\n");
> @@ -254,6 +263,13 @@ static int __init sun7i_sc_nmi_irq_init(struct device_node *node,
>  }
>  IRQCHIP_DECLARE(sun7i_sc_nmi, "allwinner,sun7i-a20-sc-nmi", sun7i_sc_nmi_irq_init);
>  
> +static int __init sun8i_v3s_sc_nmi_irq_init(struct device_node *node,
> +					    struct device_node *parent)
> +{
> +	return sunxi_sc_nmi_irq_init(node, &sun8i_v3s_reg_offs);
> +}
> +IRQCHIP_DECLARE(sun8i_v3s_sc_nmi, "allwinner,sun8i-v3s-sc-nmi", sun8i_v3s_sc_nmi_irq_init);
> +
>  static int __init sun9i_nmi_irq_init(struct device_node *node,
>  				     struct device_node *parent)
>  {
>