From: Jiang Qiu <qiujiang@huawei.com> To: Linus Walleij <linus.walleij@linaro.org> Cc: Alexandre Courbot <gnurou@gmail.com>, Mika Westerberg <mika.westerberg@linux.intel.com>, Andy Shevchenko <andy.shevchenko@gmail.com>, Alan Tull <delicious.quinoa@gmail.com>, Jamie Iles <jamie@jamieiles.com>, charles.chenxin@huawei.com, "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>, "linux-gpio@vger.kernel.org" <linux-gpio@vger.kernel.org>, ACPI Devel Maling List <linux-acpi@vger.kernel.org>, Linuxarm <linuxarm@huawei.com> Subject: Re: [PATCH v7 3/3] gpio: dwapb: add gpio-signaled acpi event support Date: Mon, 11 Apr 2016 20:33:26 +0800 [thread overview] Message-ID: <570B9996.10402@huawei.com> (raw) In-Reply-To: <CACRpkdb63AZtEOSJ0R+EqdHfKXcUr7Hs8fh9N5XHNcWjQ1Ba8A@mail.gmail.com> 在 2016/4/8 16:26, Linus Walleij 写道: > On Wed, Apr 6, 2016 at 9:08 AM, qiujiang <qiujiang@huawei.com> wrote: > >> This patch adds gpio-signaled acpi event support. It is used for >> power button on hisilicon D02 board, an arm64 platform. >> >> The corresponding DSDT file is defined as follows: >> Device(GPI0) { >> Name(_HID, "HISI0181") >> Name(_ADR, 0) >> Name(_UID, 0) >> >> Name (_CRS, ResourceTemplate () { >> Memory32Fixed (ReadWrite, 0x802e0000, 0x10000) >> Interrupt (ResourceConsumer, Level, ActiveHigh, >> Exclusive,,,) {344} >> }) >> >> Device(PRTa) { >> Name (_DSD, Package () { >> Package () { >> Package () {"reg",0}, >> Package () {"snps,nr-gpios",32}, >> } >> }) >> } >> >> Name (_AEI, ResourceTemplate () { >> GpioInt(Edge, ActiveLow, ExclusiveAndWake, >> PullUp, , " \\_SB.GPI0") {8} >> }) >> >> Method (_E08, 0x0, NotSerialized) { >> Notify (\_SB.PWRB, 0x80) >> } >> } >> >> Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com> >> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> >> Signed-off-by: qiujiang <qiujiang@huawei.com> > Admittedly I'm an ACPI novice and need help with deciding > about ACPI, but I mostly trust Mika to know these things right. > > About this: > >> + /* Add GPIO-signaled ACPI event support */ >> + if (pp->irq) >> + acpi_gpiochip_request_interrupts(&port->gc); > It's weird to me that the driver already has a requested IRQ and > everything, now it has to request it again from ACPI. > > When I look into the acpi_gpiochip_request_interrupts() > I find it weird that it is void given how much can go wrong > inside it. Should it not return an errorcode? Just as Mika said, these are two different things: platform_get_irq() requestedIRQ resource from interrupt subsystem and create irq mapping, then gose ready for device, but dose not request a handler immediately. acpi_gpiochip_request_interrupts() parse the _AEI and _EVT object and result awareness of what GPIO pin is used.Then, install a event handler for each pin by request this pp->irq. If something gose wrong when acpi_gpiochip_request_interrupts() process, GPIO itself can still works fine. >> + if (has_acpi_companion(dev) && pp->idx == 0) >> + pp->irq = platform_get_irq(to_platform_device(dev), 0); > As it was already fetched here and then later requested, > we still have to call acpi_gpiochip_request_interrupts() > further down the road? That is confusing to me, can you > explain what is going on? > > Yours, > Linus Walleij > > . > -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
WARNING: multiple messages have this Message-ID (diff)
From: Jiang Qiu <qiujiang@huawei.com> To: Linus Walleij <linus.walleij@linaro.org> Cc: Alexandre Courbot <gnurou@gmail.com>, Mika Westerberg <mika.westerberg@linux.intel.com>, Andy Shevchenko <andy.shevchenko@gmail.com>, Alan Tull <delicious.quinoa@gmail.com>, "Jamie Iles" <jamie@jamieiles.com>, <charles.chenxin@huawei.com>, "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>, "linux-gpio@vger.kernel.org" <linux-gpio@vger.kernel.org>, "ACPI Devel Maling List" <linux-acpi@vger.kernel.org>, Linuxarm <linuxarm@huawei.com> Subject: Re: [PATCH v7 3/3] gpio: dwapb: add gpio-signaled acpi event support Date: Mon, 11 Apr 2016 20:33:26 +0800 [thread overview] Message-ID: <570B9996.10402@huawei.com> (raw) In-Reply-To: <CACRpkdb63AZtEOSJ0R+EqdHfKXcUr7Hs8fh9N5XHNcWjQ1Ba8A@mail.gmail.com> 在 2016/4/8 16:26, Linus Walleij 写道: > On Wed, Apr 6, 2016 at 9:08 AM, qiujiang <qiujiang@huawei.com> wrote: > >> This patch adds gpio-signaled acpi event support. It is used for >> power button on hisilicon D02 board, an arm64 platform. >> >> The corresponding DSDT file is defined as follows: >> Device(GPI0) { >> Name(_HID, "HISI0181") >> Name(_ADR, 0) >> Name(_UID, 0) >> >> Name (_CRS, ResourceTemplate () { >> Memory32Fixed (ReadWrite, 0x802e0000, 0x10000) >> Interrupt (ResourceConsumer, Level, ActiveHigh, >> Exclusive,,,) {344} >> }) >> >> Device(PRTa) { >> Name (_DSD, Package () { >> Package () { >> Package () {"reg",0}, >> Package () {"snps,nr-gpios",32}, >> } >> }) >> } >> >> Name (_AEI, ResourceTemplate () { >> GpioInt(Edge, ActiveLow, ExclusiveAndWake, >> PullUp, , " \\_SB.GPI0") {8} >> }) >> >> Method (_E08, 0x0, NotSerialized) { >> Notify (\_SB.PWRB, 0x80) >> } >> } >> >> Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com> >> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> >> Signed-off-by: qiujiang <qiujiang@huawei.com> > Admittedly I'm an ACPI novice and need help with deciding > about ACPI, but I mostly trust Mika to know these things right. > > About this: > >> + /* Add GPIO-signaled ACPI event support */ >> + if (pp->irq) >> + acpi_gpiochip_request_interrupts(&port->gc); > It's weird to me that the driver already has a requested IRQ and > everything, now it has to request it again from ACPI. > > When I look into the acpi_gpiochip_request_interrupts() > I find it weird that it is void given how much can go wrong > inside it. Should it not return an errorcode? Just as Mika said, these are two different things: platform_get_irq() requestedIRQ resource from interrupt subsystem and create irq mapping, then gose ready for device, but dose not request a handler immediately. acpi_gpiochip_request_interrupts() parse the _AEI and _EVT object and result awareness of what GPIO pin is used.Then, install a event handler for each pin by request this pp->irq. If something gose wrong when acpi_gpiochip_request_interrupts() process, GPIO itself can still works fine. >> + if (has_acpi_companion(dev) && pp->idx == 0) >> + pp->irq = platform_get_irq(to_platform_device(dev), 0); > As it was already fetched here and then later requested, > we still have to call acpi_gpiochip_request_interrupts() > further down the road? That is confusing to me, can you > explain what is going on? > > Yours, > Linus Walleij > > . >
next prev parent reply other threads:[~2016-04-11 12:37 UTC|newest] Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top 2016-04-06 7:07 [PATCH v7 0/3] gpio: dwapb: add gpio-signaled acpi event support for power button qiujiang 2016-04-06 7:07 ` qiujiang 2016-04-06 7:07 ` [PATCH v7 1/3] gpio: dwapb: remove name from dwapb_port_property qiujiang 2016-04-06 7:07 ` qiujiang 2016-04-06 12:57 ` Andy Shevchenko 2016-04-07 11:45 ` Jiang Qiu 2016-04-07 11:45 ` Jiang Qiu 2016-04-06 7:07 ` [PATCH v7 2/3] gpio: dwapb: convert device node to fwnode qiujiang 2016-04-06 7:07 ` qiujiang 2016-04-06 13:01 ` Andy Shevchenko 2016-04-07 11:14 ` Jiang Qiu 2016-04-07 11:14 ` Jiang Qiu 2016-04-15 2:29 ` Kefeng Wang 2016-04-15 2:29 ` Kefeng Wang 2016-04-06 7:08 ` [PATCH v7 3/3] gpio: dwapb: add gpio-signaled acpi event support qiujiang 2016-04-06 7:08 ` qiujiang 2016-04-08 8:26 ` Linus Walleij 2016-04-08 8:38 ` Mika Westerberg 2016-04-11 12:43 ` Jiang Qiu 2016-04-11 12:43 ` Jiang Qiu 2016-04-12 6:46 ` Mika Westerberg 2016-04-12 6:55 ` Jiang Qiu 2016-04-12 6:55 ` Jiang Qiu 2016-04-15 7:40 ` Linus Walleij 2016-04-15 7:58 ` Jiang Qiu 2016-04-15 7:58 ` Jiang Qiu 2016-04-11 13:00 ` Linus Walleij 2016-04-11 12:33 ` Jiang Qiu [this message] 2016-04-11 12:33 ` Jiang Qiu 2016-04-06 13:03 ` [PATCH v7 0/3] gpio: dwapb: add gpio-signaled acpi event support for power button Andy Shevchenko
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