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Date: Tue, 16 Feb 2016 20:43:06 +0800
From: Jiang Qiu <qiujiang@...wei.com>
To: Mika Westerberg <mika.westerberg@...ux.intel.com>
CC: <linus.walleij@...aro.org>, <gnurou@...il.com>,
<linux-gpio@...r.kernel.org>, <linux-acpi@...r.kernel.org>,
<linux-kernel@...r.kernel.org>, <linuxarm@...wei.com>,
<haifeng.wei@...wei.com>, <charles.chenxin@...wei.com>
Subject: Re: [RFC PATCH] GPIO/ACPI: DesignWare: Add GPIO-signaled ACPI events
support for power button
在 2016/2/16 17:24, Mika Westerberg 写道:
> On Fri, Feb 05, 2016 at 02:25:42PM +0800, qiujiang wrote:
>> This patch modifies the DesignWare GPIO controller driver to
>> support the GPIO-signaled ACPI Events. This is used for power
>> button function on ARM server.
>>
>> To make it work, the _AEI and _EVT object must be defined in
>> the corresponding GPIO driver's dsdt table in UEFI. At the same
>> time, ACPI daemon component is also necessary.
>
> In general ACPI parts look ok to me. I would like to see ACPI DSDT table
> entry for this device though.
>
Thanks for review, the DSDT table for this driver is as follow:
Device(GPI0) {
Name(_HID, "HISI0181")
Name(_ADR, 0) // _ADR: Address
Name(_UID, 0)
Name (_CRS, ResourceTemplate () {
Memory32Fixed (ReadWrite, 0x802e0000, 0x10000)
Interrupt (ResourceConsumer, Level, ActiveHigh,
Exclusive,,,) {344}
})
Device(PRTa) {
Name (_DSD, Package () {
ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"),
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)
}
}
> There are few minor comments below.
>
>> Signed-off-by: qiujiang <qiujiang@...wei.com>
>> ---
>> drivers/gpio/gpio-dwapb.c | 75 ++++++++++++++++++++------------
>> include/linux/platform_data/gpio-dwapb.h | 2 +-
>> 2 files changed, 49 insertions(+), 28 deletions(-)
>>
>> diff --git a/drivers/gpio/gpio-dwapb.c b/drivers/gpio/gpio-dwapb.c
>> index fcd5b0a..bfed2e9 100644
>> --- a/drivers/gpio/gpio-dwapb.c
>> +++ b/drivers/gpio/gpio-dwapb.c
>> @@ -23,6 +23,11 @@
>> #include <linux/spinlock.h>
>> #include <linux/platform_data/gpio-dwapb.h>
>> #include <linux/slab.h>
>> +#include <linux/acpi.h>
>> +#include <linux/gpio.h>
>> +
>> +#include "gpiolib.h"
>> +
>>
>> #define GPIO_SWPORTA_DR 0x00
>> #define GPIO_SWPORTA_DDR 0x04
>> @@ -296,14 +301,14 @@ static void dwapb_configure_irqs(struct dwapb_gpio *gpio,
>> struct dwapb_port_property *pp)
>> {
>> struct gpio_chip *gc = &port->bgc.gc;
>> - struct device_node *node = pp->node;
>> + struct fwnode_handle *fwnode = pp->fwnode;
>> struct irq_chip_generic *irq_gc = NULL;
>> unsigned int hwirq, ngpio = gc->ngpio;
>> struct irq_chip_type *ct;
>> int err, i;
>>
>> - gpio->domain = irq_domain_add_linear(node, ngpio,
>> - &irq_generic_chip_ops, gpio);
>> + gpio->domain = irq_domain_create_linear(fwnode,
>> + ngpio, &irq_generic_chip_ops, gpio);
>> if (!gpio->domain)
>> return;
>>
>> @@ -421,7 +426,7 @@ static int dwapb_gpio_add_port(struct dwapb_gpio *gpio,
>> }
>>
>> #ifdef CONFIG_OF_GPIO
>> - port->bgc.gc.of_node = pp->node;
>> + port->bgc.gc.of_node = to_of_node(pp->fwnode);
>> #endif
>> port->bgc.gc.ngpio = pp->ngpio;
>> port->bgc.gc.base = pp->gpio_base;
>> @@ -440,6 +445,10 @@ static int dwapb_gpio_add_port(struct dwapb_gpio *gpio,
>> else
>> port->is_registered = true;
>>
>> + /* Add GPIO-signaled ACPI event support */
>> + if (pp->irq)
>> + acpi_gpiochip_request_interrupts(&(port->bgc.gc));
>> +
>> return err;
>> }
>>
>> @@ -453,19 +462,15 @@ static void dwapb_gpio_unregister(struct dwapb_gpio *gpio)
>> }
>>
>> static struct dwapb_platform_data *
>> -dwapb_gpio_get_pdata_of(struct device *dev)
>> +dwapb_gpio_get_pdata(struct device *dev)
>> {
>> - struct device_node *node, *port_np;
>> + struct fwnode_handle *fwnode;
>> struct dwapb_platform_data *pdata;
>> struct dwapb_port_property *pp;
>> int nports;
>> int i;
>>
>> - node = dev->of_node;
>> - if (!IS_ENABLED(CONFIG_OF_GPIO) || !node)
>> - return ERR_PTR(-ENODEV);
>> -
>> - nports = of_get_child_count(node);
>> + nports = device_get_child_node_count(dev);
>> if (nports == 0)
>> return ERR_PTR(-ENODEV);
>>
>> @@ -480,21 +485,19 @@ dwapb_gpio_get_pdata_of(struct device *dev)
>> pdata->nports = nports;
>>
>> i = 0;
>> - for_each_child_of_node(node, port_np) {
>> - pp = &pdata->properties[i++];
>> - pp->node = port_np;
>> + device_for_each_child_node(dev, fwnode) {
>> + pp = &pdata->properties[i];
>> + pp->fwnode = fwnode;
>>
>> - if (of_property_read_u32(port_np, "reg", &pp->idx) ||
>> + if (fwnode_property_read_u32(fwnode, "reg", &pp->idx) ||
>> pp->idx >= DWAPB_MAX_PORTS) {
>> - dev_err(dev, "missing/invalid port index for %s\n",
>> - port_np->full_name);
>> + dev_err(dev, "missing/invalid port index\n");
>> return ERR_PTR(-EINVAL);
>> }
>>
>> - if (of_property_read_u32(port_np, "snps,nr-gpios",
>> + if (fwnode_property_read_u32(fwnode, "snps,nr-gpios",
>> &pp->ngpio)) {
>> - dev_info(dev, "failed to get number of gpios for %s\n",
>> - port_np->full_name);
>> + dev_info(dev, "failed to get number of gpios\n");
>> pp->ngpio = 32;
>> }
>>
>> @@ -502,18 +505,27 @@ dwapb_gpio_get_pdata_of(struct device *dev)
>> * Only port A can provide interrupts in all configurations of
>> * the IP.
>> */
>> - if (pp->idx == 0 &&
>> - of_property_read_bool(port_np, "interrupt-controller")) {
>> - pp->irq = irq_of_parse_and_map(port_np, 0);
>> + if (dev->of_node && pp->idx == 0 &&
>> + of_property_read_bool(to_of_node(fwnode),
>> + "interrupt-controller")) {
>> + pp->irq = irq_of_parse_and_map(to_of_node(fwnode), 0);
>> if (!pp->irq) {
>> - dev_warn(dev, "no irq for bank %s\n",
>> - port_np->full_name);
>> + dev_warn(dev, "no irq for bank %s\n",
>> + to_of_node(fwnode)->full_name);
>> }
>> }
>>
>> + if (ACPI_COMPANION(dev) && pp->idx == 0)
>
> You can also use has_acpi_companion(dev) here.
OK, I will fix it, thank you.
>
>> + pp->irq = platform_get_irq(to_platform_device(dev), 0);
>> +
>> pp->irq_shared = false;
>> pp->gpio_base = -1;
>> - pp->name = port_np->full_name;
>> +
>> + if (dev->of_node)
>> + pp->name = to_of_node(fwnode)->full_name;
>> +
>> + if (ACPI_COMPANION(dev))
>> + pp->name = acpi_dev_name(to_acpi_device_node(fwnode));
>> }
>>
>> return pdata;
>> @@ -529,7 +541,7 @@ static int dwapb_gpio_probe(struct platform_device *pdev)
>> struct dwapb_platform_data *pdata = dev_get_platdata(dev);
>>
>> if (!pdata) {
>> - pdata = dwapb_gpio_get_pdata_of(dev);
>> + pdata = dwapb_gpio_get_pdata(dev);
>> if (IS_ERR(pdata))
>> return PTR_ERR(pdata);
>> }
>> @@ -559,6 +571,7 @@ static int dwapb_gpio_probe(struct platform_device *pdev)
>> if (err)
>> goto out_unregister;
>> }
>> +
>
> Unrelated whitespace change.
Fine, I will fix it.
>
>> platform_set_drvdata(pdev, gpio);
>>
>> return 0;
>> @@ -586,6 +599,13 @@ static const struct of_device_id dwapb_of_match[] = {
>> };
>> MODULE_DEVICE_TABLE(of, dwapb_of_match);
>>
>> +static const struct acpi_device_id dwapb_acpi_match[] = {
>> + {"HISI0181", 0},
>
> Too many tabs.
>
Yes, here is my fault to this redundant tab, thanks for reminder.
>> + { }
>> +};
>> +MODULE_DEVICE_TABLE(acpi, dwapb_acpi_match);
>> +
>> +
>> #ifdef CONFIG_PM_SLEEP
>> static int dwapb_gpio_suspend(struct device *dev)
>> {
>> @@ -680,6 +700,7 @@ static struct platform_driver dwapb_gpio_driver = {
>> .name = "gpio-dwapb",
>> .pm = &dwapb_gpio_pm_ops,
>> .of_match_table = of_match_ptr(dwapb_of_match),
>> + .acpi_match_table = ACPI_PTR(dwapb_acpi_match),
>> },
>> .probe = dwapb_gpio_probe,
>> .remove = dwapb_gpio_remove,
>> diff --git a/include/linux/platform_data/gpio-dwapb.h b/include/linux/platform_data/gpio-dwapb.h
>> index 28702c8..c5bd1f2 100644
>> --- a/include/linux/platform_data/gpio-dwapb.h
>> +++ b/include/linux/platform_data/gpio-dwapb.h
>> @@ -15,7 +15,7 @@
>> #define GPIO_DW_APB_H
>>
>> struct dwapb_port_property {
>> - struct device_node *node;
>> + struct fwnode_handle *fwnode;
>> const char *name;
>> unsigned int idx;
>> unsigned int ngpio;
>> --
>> 1.9.1
>>
>> --
>> To unsubscribe from this list: send the line "unsubscribe linux-acpi" in
>> the body of a message to majordomo@...r.kernel.org
>> More majordomo info at http://vger.kernel.org/majordomo-info.html
>
> .
>
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