linux-kernel - Re: [v3 01/11] irqchip: ls-extirq: Add LS1043A, LS1088A external interrupt

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Date:   Mon, 30 Nov 2020 08:20:18 +0000
From:   Marc Zyngier <maz@...nel.org>
To:     Biwen Li <biwen.li@....nxp.com>
Cc:     linux@...musvillemoes.dk, shawnguo@...nel.org, robh+dt@...nel.org,
        mark.rutland@....com, leoyang.li@....com, zhiqiang.hou@....com,
        tglx@...utronix.de, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, jiafei.pan@....com,
        xiaobo.xie@....com, linux-arm-kernel@...ts.infradead.org,
        Biwen Li <biwen.li@....com>
Subject: Re: [v3 01/11] irqchip: ls-extirq: Add LS1043A, LS1088A external
 interrupt

[- jason]

On 2020-11-30 03:30, Biwen Li wrote:
> From: Hou Zhiqiang <Zhiqiang.Hou@....com>
> 
> Add an new IRQ chip declaration for LS1043A and LS1088A
> - compatible "fsl,ls1043a-extirq" for LS1043A, LS1046A.
> - compatible "fsl,ls1088a-extirq" for LS1088A, LS208xA, LX216xA
> 
> Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@....com>
> Signed-off-by: Biwen Li <biwen.li@....com>
> ---
> Change in v3:
> 	- cleanup code
> 	- remove robust copyright
> 
> Change in v2:
> 	- add despcription of bit reverse
> 	- update copyright
> 
>  drivers/irqchip/irq-ls-extirq.c | 17 +++++++----------
>  1 file changed, 7 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/irqchip/irq-ls-extirq.c 
> b/drivers/irqchip/irq-ls-extirq.c
> index 4d1179fed77c..47804ce78b21 100644
> --- a/drivers/irqchip/irq-ls-extirq.c
> +++ b/drivers/irqchip/irq-ls-extirq.c
> @@ -18,7 +18,7 @@
>  struct ls_extirq_data {
>  	struct regmap		*syscon;
>  	u32			intpcr;
> -	bool			bit_reverse;
> +	bool			is_ls1021a_or_ls1043a;
>  	u32			nirq;
>  	struct irq_fwspec	map[MAXIRQ];
>  };
> @@ -30,7 +30,7 @@ ls_extirq_set_type(struct irq_data *data, unsigned 
> int type)
>  	irq_hw_number_t hwirq = data->hwirq;
>  	u32 value, mask;
> 
> -	if (priv->bit_reverse)
> +	if (priv->is_ls1021a_or_ls1043a)
>  		mask = 1U << (31 - hwirq);
>  	else
>  		mask = 1U << hwirq;
> @@ -174,14 +174,9 @@ ls_extirq_of_init(struct device_node *node,
> struct device_node *parent)
>  	if (ret)
>  		goto out;
> 
> -	if (of_device_is_compatible(node, "fsl,ls1021a-extirq")) {
> -		u32 revcr;
> -
> -		ret = regmap_read(priv->syscon, LS1021A_SCFGREVCR, &revcr);
> -		if (ret)
> -			goto out;
> -		priv->bit_reverse = (revcr != 0);
> -	}

This isn't explained in the commit message. You are changing the way
you infer some properties, and that's not innocent. Please describe
all important changes in the commit message.

> +	if (of_device_is_compatible(node, "fsl,ls1021a-extirq") || \

Spurious trailing \?

> +	    of_device_is_compatible(node, "fsl,ls1043a-extirq"))
> +		priv->is_ls1021a_or_ls1043a = true;

Which is better written as:

         priv->is_ls1021a_or_ls1043a = (of_device_is_compatible(node, 
"fsl,ls1021a-extirq") ||
                                        of_device_is_compatible(node, 
"fsl,ls1043a-extirq"));
> 
>  	domain = irq_domain_add_hierarchy(parent_domain, 0, priv->nirq, node,
>  					  &extirq_domain_ops, priv);
> @@ -195,3 +190,5 @@ ls_extirq_of_init(struct device_node *node, struct
> device_node *parent)
>  }
> 
>  IRQCHIP_DECLARE(ls1021a_extirq, "fsl,ls1021a-extirq", 
> ls_extirq_of_init);
> +IRQCHIP_DECLARE(ls1043a_extirq, "fsl,ls1043a-extirq", 
> ls_extirq_of_init);
> +IRQCHIP_DECLARE(ls1088a_extirq, "fsl,ls1088a-extirq", 
> ls_extirq_of_init);

Thanks,

         M.
-- 
Jazz is not dead. It just smells funny...