From: Paul Mundt <lethal@linux-sh.org>
To: linux-sh@vger.kernel.org
Subject: Re: [PATCH 2/2] ARM: mach-shmobile: mackerel: add renesas_usbhs support for USB1
Date: Wed, 25 May 2011 02:57:02 +0000 [thread overview]
Message-ID: <20110525025701.GI14329@linux-sh.org> (raw)
In-Reply-To: <w3phbc5yjly.wl%kuninori.morimoto.gx@renesas.com>
On Wed, May 25, 2011 at 11:49:25AM +0900, Kuninori Morimoto wrote:
> CN31 USB1 can be Host/Function, and it can use IRQ8 as USB-phy.
> This mean we can power off it if...
> - while USB1 is disconnected.
> - USB-Function is selected.
> - driver is supporting it.
>
> OTOH, CN22 USB0 which is only USB Function
> can not use USB-phy interrupt (IRQ7) on mackerel board.
> Because IRQ7 is already used by Touchscreen,
> and it is impossible to use cascaded IRQ7.
>
Why is it impossible to have an IRQ7 demux?
> renesas_usbhs driver which is supporting USB-Function
> is supporting USB power off when disconnect.
> mackerel board will use renesas_usbhs driver as
> USB-Function on CN31 if it have CONFIG_USB_RENESAS_USBHS.
> And r8a66597_hcd will be used as USB Host if it have CONFIG_USB_R8A66597_HCD.
>
> But you can not select both CONFIG_USB_R8A66597_HCD and
> CONFIG_USB_RENESAS_USBHS in same time for now.
> Because IRQ8 will be requested in different driver.
>
Is there some particular reason why IRQF_SHARED isn't sufficient for
working around this? Since you're leveraging the IORESOURCE PnP IRQ bits
anyways, you could easily just or in IORESOURCE_IRQ_SHAREABLE and
translate that in to an IRQF_SHARED at request_irq() time for the cases
that need it.
next prev parent reply other threads:[~2011-05-25 2:57 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-02-15 5:03 [PATCH 2/2] ARM: mach-shmobile: mackerel: fixup memory initialize for Kuninori Morimoto
2011-02-17 0:41 ` [PATCH 2/2] ARM: mach-shmobile: mackerel: fixup memory Simon Horman
2011-02-17 1:11 ` [PATCH 2/2] ARM: mach-shmobile: mackerel: fixup memory initialize Kuninori Morimoto
2011-05-25 2:49 ` [PATCH 2/2] ARM: mach-shmobile: mackerel: add renesas_usbhs support Kuninori Morimoto
2011-05-25 2:57 ` Paul Mundt [this message]
2011-05-25 4:24 ` [PATCH 2/2] ARM: mach-shmobile: mackerel: add renesas_usbhs Kuninori Morimoto
2011-05-25 5:40 ` [PATCH 2/2] ARM: mach-shmobile: mackerel: add renesas_usbhs support for USB1 Paul Mundt
2012-03-01 4:25 ` [PATCH 2/2] ARM: mach-shmobile: mackerel: Add FSI DMAEngine support Kuninori Morimoto
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