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Message-ID: <CAHp75VefypfqtGY4g747+dCugx2j9ogxC2uDLwJWMZnGyWMgyA@mail.gmail.com>
Date: Wed, 17 Feb 2016 16:47:50 +0200
From: Andy Shevchenko <andy.shevchenko@...il.com>
To: qiujiang <qiujiang@...wei.com>
Cc: Linus Walleij <linus.walleij@...aro.org>,
Alexandre Courbot <gnurou@...il.com>,
Mika Westerberg <mika.westerberg@...ux.intel.com>,
"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
linuxarm@...wei.com, haifeng.wei@...wei.com,
charles.chenxin@...wei.com
Subject: Re: [PATCH v1] GPIO/ACPI: DesignWare: Add GPIO-signaled ACPI events
support for power button
On Wed, Feb 17, 2016 at 9:28 AM, qiujiang <qiujiang@...wei.com> 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 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 () {
> 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)
> }
> }
>
The contents looks fine to me, though I would suggest to split to two
patches if possible, i.e. preparatory patch which switches to use
fwnode, and the second one with the extent.
> Signed-off-by: qiujiang <qiujiang@...wei.com>
> ---
> drivers/gpio/gpio-dwapb.c | 71 ++++++++++++++++++++------------
> include/linux/platform_data/gpio-dwapb.h | 2 +-
> 2 files changed, 45 insertions(+), 28 deletions(-)
>
> diff --git a/drivers/gpio/gpio-dwapb.c b/drivers/gpio/gpio-dwapb.c
> index fcd5b0a..e482e32 100644
> --- a/drivers/gpio/gpio-dwapb.c
> +++ b/drivers/gpio/gpio-dwapb.c
> @@ -7,6 +7,7 @@
> *
> * All enquiries to support@...ochip.com
> */
> +#include <linux/acpi.h>
> #include <linux/basic_mmio_gpio.h>
> #include <linux/err.h>
> #include <linux/init.h>
> @@ -24,6 +25,8 @@
> #include <linux/platform_data/gpio-dwapb.h>
> #include <linux/slab.h>
>
> +#include "gpiolib.h"
> +
> #define GPIO_SWPORTA_DR 0x00
> #define GPIO_SWPORTA_DDR 0x04
> #define GPIO_SWPORTB_DR 0x0c
> @@ -296,14 +299,14 @@ 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 +424,7 @@ 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 +443,10 @@ 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 +460,15 @@ 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 +483,19 @@ 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 +503,27 @@ 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 (has_acpi_companion(dev) && pp->idx == 0)
> + 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 (has_acpi_companion(dev))
> + pp->name = acpi_dev_name(to_acpi_device_node(fwnode));
> }
>
> return pdata;
> @@ -529,7 +539,7 @@ 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);
> }
> @@ -586,6 +596,12 @@ 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},
> + { }
> +};
> +MODULE_DEVICE_TABLE(acpi, dwapb_acpi_match);
> +
> #ifdef CONFIG_PM_SLEEP
> static int dwapb_gpio_suspend(struct device *dev)
> {
> @@ -680,6 +696,7 @@ 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..80954f2 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
>
--
With Best Regards,
Andy Shevchenko
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