On Mon, 4 Jan 2016 13:28:27 +0900
Milo Kim <milo....@ti.com> wrote:

> Atmel AIC disables RTT(Real Time Timer) interrupt on initialization.
> Alarm interrupt(ALMIEN) and RTT increment interrupt(RTTINCIEN) are used.
> However, the controller doesn't need to do it.
> 
> * RTT driver disables interrupts on _probe().
>   ALMIEN and RTTINCIEN bits in RTT_MR are cleared to disable RTT
>   interrupts.
>   (drivers/rtc/rtc-at91sam9.c)
>   /* disable all interrupts (same as on shutdown path) */
>   mr &= ~(AT91_RTT_ALMIEN | AT91_RTT_RTTINCIEN);
>   rtt_writel(rtc, MR, mr);
> 
> * All RTT interrupts are disabled by default.
>   Reset value of ALMIEN and RTTINCIEN bits are 0.
>   Please note that all devices have same RTT registers.
>   AT91RM9G45
>   AT91SAM9RL
>   AT91SAM9260
>   AT91SAM9261
>   AT91SAM9263
>   AT91SAM9G20
> 
> So, aic_common_rtt_irq_fixup() helper can be removed.
> And aic_common_irq_fixup() also can be removed because no driver
> calls it any more.

Same as for patch 2, you cannot remove these functions without
impacting the system behavior.

> 
> Cc: Thomas Gleixner <t...@linutronix.de>
> Cc: Jason Cooper <ja...@lakedaemon.net>
> Cc: Marc Zyngier <marc.zyng...@arm.com>
> Cc: Alexandre Belloni <alexandre.bell...@free-electrons.com>
> Cc: Boris BREZILLON <boris.brezil...@free-electrons.com>
> Cc: Ludovic Desroches <ludovic.desroc...@atmel.com>
> Cc: Nicolas Ferre <nicolas.fe...@atmel.com>
> Cc: linux-kernel@vger.kernel.org
> Signed-off-by: Milo Kim <milo....@ti.com>
> ---
>  drivers/irqchip/irq-atmel-aic-common.c | 45 
> ----------------------------------
>  drivers/irqchip/irq-atmel-aic-common.h |  4 ---
>  drivers/irqchip/irq-atmel-aic.c        | 22 -----------------
>  3 files changed, 71 deletions(-)
> 
> diff --git a/drivers/irqchip/irq-atmel-aic-common.c 
> b/drivers/irqchip/irq-atmel-aic-common.c
> index f8261be..ef2c619 100644
> --- a/drivers/irqchip/irq-atmel-aic-common.c
> +++ b/drivers/irqchip/irq-atmel-aic-common.c
> @@ -139,51 +139,6 @@ static void __init aic_common_ext_irq_of_init(struct 
> irq_domain *domain)
>       }
>  }
>  
> -#define AT91_RTT_MR          0x00                    /* Real-time Mode 
> Register */
> -#define AT91_RTT_ALMIEN              (1 << 16)               /* Alarm 
> Interrupt Enable */
> -#define AT91_RTT_RTTINCIEN   (1 << 17)               /* Real Time Timer 
> Increment Interrupt Enable */
> -
> -void __init aic_common_rtt_irq_fixup(struct device_node *root)
> -{
> -     struct device_node *np;
> -     void __iomem *regs;
> -
> -     /*
> -      * The at91sam9263 SoC has 2 instances of the RTT block, hence we
> -      * iterate over the DT to find each occurrence.
> -      */
> -     for_each_compatible_node(np, NULL, "atmel,at91sam9260-rtt") {
> -             regs = of_iomap(np, 0);
> -             if (!regs)
> -                     continue;
> -
> -             writel(readl(regs + AT91_RTT_MR) &
> -                    ~(AT91_RTT_ALMIEN | AT91_RTT_RTTINCIEN),
> -                    regs + AT91_RTT_MR);
> -
> -             iounmap(regs);
> -     }
> -}
> -
> -void __init aic_common_irq_fixup(const struct of_device_id *matches)
> -{
> -     struct device_node *root = of_find_node_by_path("/");
> -     const struct of_device_id *match;
> -
> -     if (!root)
> -             return;
> -
> -     match = of_match_node(matches, root);
> -     of_node_put(root);
> -
> -     if (match) {
> -             void (*fixup)(struct device_node *) = match->data;
> -             fixup(root);
> -     }
> -
> -     of_node_put(root);
> -}
> -
>  struct irq_domain *__init aic_common_of_init(struct device_node *node,
>                                            const struct irq_domain_ops *ops,
>                                            const char *name, int nirqs)
> diff --git a/drivers/irqchip/irq-atmel-aic-common.h 
> b/drivers/irqchip/irq-atmel-aic-common.h
> index 9027f15..c178557 100644
> --- a/drivers/irqchip/irq-atmel-aic-common.h
> +++ b/drivers/irqchip/irq-atmel-aic-common.h
> @@ -32,8 +32,4 @@ struct irq_domain *__init aic_common_of_init(struct 
> device_node *node,
>                                            const struct irq_domain_ops *ops,
>                                            const char *name, int nirqs);
>  
> -void __init aic_common_rtt_irq_fixup(struct device_node *root);
> -
> -void __init aic_common_irq_fixup(const struct of_device_id *matches);
> -
>  #endif /* __IRQ_ATMEL_AIC_COMMON_H */
> diff --git a/drivers/irqchip/irq-atmel-aic.c b/drivers/irqchip/irq-atmel-aic.c
> index 4c60224..6fcd680 100644
> --- a/drivers/irqchip/irq-atmel-aic.c
> +++ b/drivers/irqchip/irq-atmel-aic.c
> @@ -209,26 +209,6 @@ static const struct irq_domain_ops aic_irq_ops = {
>       .xlate  = aic_irq_domain_xlate,
>  };
>  
> -static void __init at91sam9260_aic_irq_fixup(struct device_node *root)
> -{
> -     aic_common_rtt_irq_fixup(root);
> -}
> -
> -static void __init at91sam9g45_aic_irq_fixup(struct device_node *root)
> -{
> -     aic_common_rtt_irq_fixup(root);
> -}
> -
> -static const struct of_device_id aic_irq_fixups[] __initconst = {
> -     { .compatible = "atmel,at91sam9g45", .data = at91sam9g45_aic_irq_fixup 
> },
> -     { .compatible = "atmel,at91sam9rl", .data = at91sam9g45_aic_irq_fixup },
> -     { .compatible = "atmel,at91sam9260", .data = at91sam9260_aic_irq_fixup 
> },
> -     { .compatible = "atmel,at91sam9261", .data = at91sam9260_aic_irq_fixup 
> },
> -     { .compatible = "atmel,at91sam9263", .data = at91sam9260_aic_irq_fixup 
> },
> -     { .compatible = "atmel,at91sam9g20", .data = at91sam9260_aic_irq_fixup 
> },
> -     { /* sentinel */ },
> -};
> -
>  static int __init aic_of_init(struct device_node *node,
>                             struct device_node *parent)
>  {
> @@ -243,8 +223,6 @@ static int __init aic_of_init(struct device_node *node,
>       if (IS_ERR(domain))
>               return PTR_ERR(domain);
>  
> -     aic_common_irq_fixup(aic_irq_fixups);
> -
>       aic_domain = domain;
>       gc = irq_get_domain_generic_chip(domain, 0);
>  



-- 
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com
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