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From: Kefeng Wang <wangkefeng.wang@huawei.com>
To: Rob Herring <robh+dt@kernel.org>
Cc: Saravana Kannan <saravanak@google.com>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	Frank Rowand <frowand.list@gmail.com>,
	<devicetree@vger.kernel.org>,
	Russell King <linux@armlinux.org.uk>,
	"Linus Walleij" <linus.walleij@linaro.org>,
	linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
	Ruizhe Lin <linruizhe@huawei.com>
Subject: Re: [PATCH 3/3] amba: Properly handle device probe without IRQ domain
Date: Wed, 25 Aug 2021 22:41:15 +0800	[thread overview]
Message-ID: <d7a1d3a8-bda4-7a29-b66d-22ed4926f9c8@huawei.com> (raw)
In-Reply-To: <CAL_Jsq+0rq6u5d7itETOnQWx_V+J3aP1m1Zgehi5QKVoKvdbvQ@mail.gmail.com>


On 2021/8/25 20:33, Rob Herring wrote:
> On Tue, Aug 24, 2021 at 11:05 PM Kefeng Wang <wangkefeng.wang@huawei.com> wrote:

...

>>> Similar to other resources the AMBA bus "gets" for the device, I think
>>> this should be moved into amba_probe() and not here. There's no reason
>>> to delay the addition of the device (and loading its module) because
>>> the IRQ isn't ready yet.
>> The following code in the amba_device_try_add() will be called, it uses irq[0]
>> and irq[1], so I put of_amba_device_decode_irq() into amba_device_try_add().
>>
>> 470         if (dev->irq[0])
>> 471                 ret = device_create_file(&dev->dev, &dev_attr_irq0);
>> 472         if (ret == 0 && dev->irq[1])
>> 473                 ret = device_create_file(&dev->dev, &dev_attr_irq1);
>> 474         if (ret == 0)
>> 475                 return ret;
> I wonder if we could just remove these. Why does userspace need them
> in the first place? It's only an ABI if someone notices. Looking at
> the history, AMBA bus was added in 2003 with just 'irq' and then
> changed (ABI break) in 2004 to 'irq0' and 'irq1'.
>
> Rob

Ok, I will kill all irq parts,

diff --git a/drivers/amba/bus.c b/drivers/amba/bus.c
index 962041148482..c08e8b30e02c 100644
--- a/drivers/amba/bus.c
+++ b/drivers/amba/bus.c
@@ -20,8 +20,6 @@
  #include <linux/platform_device.h>
  #include <linux/reset.h>

-#include <asm/irq.h>
-
  #define to_amba_driver(d)      container_of(d, struct amba_driver, drv)

  /* called on periphid match and class 0x9 coresight device. */
@@ -135,8 +133,6 @@ static ssize_t name##_show(struct device 
*_dev,                             \
  static DEVICE_ATTR_RO(name)

  amba_attr_func(id, "%08x\n", dev->periphid);
-amba_attr_func(irq0, "%u\n", dev->irq[0]);
-amba_attr_func(irq1, "%u\n", dev->irq[1]);
  amba_attr_func(resource, "\t%016llx\t%016llx\t%016lx\n",
          (unsigned long long)dev->res.start, (unsigned long 
long)dev->res.end,
          dev->res.flags);
@@ -467,10 +463,6 @@ static int amba_device_try_add(struct amba_device 
*dev, struct resource *parent)
         if (ret)
                 goto err_release;

-       if (dev->irq[0])
-               ret = device_create_file(&dev->dev, &dev_attr_irq0);
-       if (ret == 0 && dev->irq[1])
-               ret = device_create_file(&dev->dev, &dev_attr_irq1);

and do some cleanup about error handling in the next version.

>
> [1] https://git.kernel.org/pub/scm/linux/kernel/git/tglx/history.git/log/arch/arm/common/amba.c
> .
>

  reply	other threads:[~2021-08-25 14:41 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-16  7:46 [PATCH 0/3] " Kefeng Wang
2021-08-16  7:46 ` [PATCH 1/3] amba: Drop unused functions about APB/AHB devices add Kefeng Wang
2021-08-16  7:46 ` [PATCH 2/3] Revert "ARM: amba: make use of -1 IRQs warn" Kefeng Wang
2021-08-16  7:46 ` [PATCH 3/3] amba: Properly handle device probe without IRQ domain Kefeng Wang
2021-08-24 20:05   ` Rob Herring
2021-08-24 20:08     ` Saravana Kannan
2021-08-25  4:05       ` Kefeng Wang
2021-08-25  8:04         ` Saravana Kannan
2021-08-25  8:39           ` Kefeng Wang
2021-08-26  2:45           ` Kefeng Wang
2021-08-26  4:45             ` Saravana Kannan
2021-08-26  6:22               ` Kefeng Wang
2021-08-26  8:22               ` [BUG] amba: Remove deferred device addition Kefeng Wang
2021-08-27  0:04                 ` Saravana Kannan
2021-08-27 14:38                   ` Kefeng Wang
2021-08-27 19:09                     ` Saravana Kannan
2021-08-28  1:09                       ` Kefeng Wang
2021-09-09  3:30                         ` Saravana Kannan
2021-09-10  7:59                           ` Kefeng Wang
2022-07-05 19:25                             ` Saravana Kannan
2022-08-27 10:26                               ` Leizhen (ThunderTown)
2021-08-25 12:33         ` [PATCH 3/3] amba: Properly handle device probe without IRQ domain Rob Herring
2021-08-25 14:41           ` Kefeng Wang [this message]
2021-08-17 22:27 ` [PATCH 0/3] " Rob Herring
2021-08-23  2:19   ` Kefeng Wang
2021-08-23  9:05     ` Russell King (Oracle)
2021-08-23 10:57       ` Kefeng Wang

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