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Date: Mon, 4 Jan 2016 09:16:49 +0100
From: Boris Brezillon <boris.brezillon@...e-electrons.com>
To: Milo Kim <milo.kim@...com>
Cc: <tglx@...utronix.de>, <jason@...edaemon.net>,
<marc.zyngier@....com>, <alexandre.belloni@...e-electrons.com>,
<ludovic.desroches@...el.com>, <nicolas.ferre@...el.com>,
<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 02/19] irqchip: atmel-aic: clean up RTC interrupt code
Hi Milo,
On Mon, 4 Jan 2016 13:28:26 +0900
Milo Kim <milo.kim@...com> wrote:
> Atmel AIC disables RTC interrupt on initialization. However, the controller
> doesn't need to do it. There are two reasons.
>
> * RTC driver disables interrupts on _probe()
> RTC_IDR is set to 0x1f which means all RTC interrupts are disabled.
> (drivers/rtc/rtc-at91rm9200.c)
> at91_rtc_write_idr(AT91_RTC_ACKUPD | AT91_RTC_ALARM |
> AT91_RTC_SECEV | AT91_RTC_TIMEV |
> AT91_RTC_CALEV);
>
> * All RTC interrupts are disabled by default.
> If we try to read RTC_IMR(interrup mask status), then read value is 0
> by default. It means all RTC interrupts are disabled by default.
> We can also check the default status in the datasheet. Please note that
> all devices have same RTC registers.
> AT91RM9200
> AT91SAM9N12
> AT91SAM9X5
> AT91SAM9G45
> AT91SAM9RL
> SAMA5D3
> SAMA5D4
>
> So, aic_common_rtc_irq_fixup() helper can be removed.
Please read b2f579b58e93 ("irqchip: atmel-aic: Add irq fixup
infrastructure") and 3d61467f9bab ("irqchip: atmel-aic: Implement RTC
irq fixup") messages before assuming you can simply remove these
functions.
There's a good reason behind this irq fixup infrastructure, and you're
blindly removing those functions without asking why we were doing that.
Best Regards,
Boris
>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Jason Cooper <jason@...edaemon.net>
> Cc: Marc Zyngier <marc.zyngier@....com>
> Cc: Alexandre Belloni <alexandre.belloni@...e-electrons.com>
> Cc: Boris BREZILLON <boris.brezillon@...e-electrons.com>
> Cc: Ludovic Desroches <ludovic.desroches@...el.com>
> Cc: Nicolas Ferre <nicolas.ferre@...el.com>
> Cc: linux-kernel@...r.kernel.org
> Signed-off-by: Milo Kim <milo.kim@...com>
> ---
> drivers/irqchip/irq-atmel-aic-common.c | 28 ----------------------------
> drivers/irqchip/irq-atmel-aic-common.h | 2 --
> drivers/irqchip/irq-atmel-aic.c | 9 ---------
> drivers/irqchip/irq-atmel-aic5.c | 13 -------------
> 4 files changed, 52 deletions(-)
>
> diff --git a/drivers/irqchip/irq-atmel-aic-common.c b/drivers/irqchip/irq-atmel-aic-common.c
> index 37199b9..f8261be 100644
> --- a/drivers/irqchip/irq-atmel-aic-common.c
> +++ b/drivers/irqchip/irq-atmel-aic-common.c
> @@ -139,34 +139,6 @@ static void __init aic_common_ext_irq_of_init(struct irq_domain *domain)
> }
> }
>
> -#define AT91_RTC_IDR 0x24
> -#define AT91_RTC_IMR 0x28
> -#define AT91_RTC_IRQ_MASK 0x1f
> -
> -void __init aic_common_rtc_irq_fixup(struct device_node *root)
> -{
> - struct device_node *np;
> - void __iomem *regs;
> -
> - np = of_find_compatible_node(root, NULL, "atmel,at91rm9200-rtc");
> - if (!np)
> - np = of_find_compatible_node(root, NULL,
> - "atmel,at91sam9x5-rtc");
> -
> - if (!np)
> - return;
> -
> - regs = of_iomap(np, 0);
> - of_node_put(np);
> -
> - if (!regs)
> - return;
> -
> - writel(AT91_RTC_IRQ_MASK, regs + AT91_RTC_IDR);
> -
> - iounmap(regs);
> -}
> -
> #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 */
> diff --git a/drivers/irqchip/irq-atmel-aic-common.h b/drivers/irqchip/irq-atmel-aic-common.h
> index 603f0a9..9027f15 100644
> --- a/drivers/irqchip/irq-atmel-aic-common.h
> +++ b/drivers/irqchip/irq-atmel-aic-common.h
> @@ -32,8 +32,6 @@ 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_rtc_irq_fixup(struct device_node *root);
> -
> void __init aic_common_rtt_irq_fixup(struct device_node *root);
>
> void __init aic_common_irq_fixup(const struct of_device_id *matches);
> diff --git a/drivers/irqchip/irq-atmel-aic.c b/drivers/irqchip/irq-atmel-aic.c
> index 8a0c7f2..4c60224 100644
> --- a/drivers/irqchip/irq-atmel-aic.c
> +++ b/drivers/irqchip/irq-atmel-aic.c
> @@ -209,11 +209,6 @@ static const struct irq_domain_ops aic_irq_ops = {
> .xlate = aic_irq_domain_xlate,
> };
>
> -static void __init at91rm9200_aic_irq_fixup(struct device_node *root)
> -{
> - aic_common_rtc_irq_fixup(root);
> -}
> -
> static void __init at91sam9260_aic_irq_fixup(struct device_node *root)
> {
> aic_common_rtt_irq_fixup(root);
> @@ -221,16 +216,12 @@ static void __init at91sam9260_aic_irq_fixup(struct device_node *root)
>
> static void __init at91sam9g45_aic_irq_fixup(struct device_node *root)
> {
> - aic_common_rtc_irq_fixup(root);
> aic_common_rtt_irq_fixup(root);
> }
>
> static const struct of_device_id aic_irq_fixups[] __initconst = {
> - { .compatible = "atmel,at91rm9200", .data = at91rm9200_aic_irq_fixup },
> { .compatible = "atmel,at91sam9g45", .data = at91sam9g45_aic_irq_fixup },
> - { .compatible = "atmel,at91sam9n12", .data = at91rm9200_aic_irq_fixup },
> { .compatible = "atmel,at91sam9rl", .data = at91sam9g45_aic_irq_fixup },
> - { .compatible = "atmel,at91sam9x5", .data = at91rm9200_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 },
> diff --git a/drivers/irqchip/irq-atmel-aic5.c b/drivers/irqchip/irq-atmel-aic5.c
> index 62bb840..8b8f5e2 100644
> --- a/drivers/irqchip/irq-atmel-aic5.c
> +++ b/drivers/irqchip/irq-atmel-aic5.c
> @@ -285,17 +285,6 @@ static const struct irq_domain_ops aic5_irq_ops = {
> .xlate = aic5_irq_domain_xlate,
> };
>
> -static void __init sama5d3_aic_irq_fixup(struct device_node *root)
> -{
> - aic_common_rtc_irq_fixup(root);
> -}
> -
> -static const struct of_device_id aic5_irq_fixups[] __initconst = {
> - { .compatible = "atmel,sama5d3", .data = sama5d3_aic_irq_fixup },
> - { .compatible = "atmel,sama5d4", .data = sama5d3_aic_irq_fixup },
> - { /* sentinel */ },
> -};
> -
> static int __init aic5_of_init(struct device_node *node,
> struct device_node *parent,
> int nirqs)
> @@ -316,8 +305,6 @@ static int __init aic5_of_init(struct device_node *node,
> if (IS_ERR(domain))
> return PTR_ERR(domain);
>
> - aic_common_irq_fixup(aic5_irq_fixups);
> -
> aic5_domain = domain;
> nchips = aic5_domain->revmap_size / 32;
> for (i = 0; i < nchips; i++) {
--
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com
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