linux-kernel - [PATCH v17 07/10] ACPI / scan: rename acpi_is_serial_bus

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Date:   Thu, 15 Mar 2018 02:15:56 +0800
From:   John Garry <john.garry@...wei.com>
To:     <mika.westerberg@...ux.intel.com>, <rafael@...nel.org>,
        <lorenzo.pieralisi@....com>, <rjw@...ysocki.net>,
        <hanjun.guo@...aro.org>, <robh+dt@...nel.org>,
        <bhelgaas@...gle.com>, <arnd@...db.de>, <mark.rutland@....com>,
        <olof@...om.net>, <dann.frazier@...onical.com>,
        <andy.shevchenko@...il.com>, <robh@...nel.org>,
        <andriy.shevchenko@...ux.intel.com>
CC:     <joe@...ches.com>, <benh@...nel.crashing.org>,
        <linux-pci@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-acpi@...r.kernel.org>, <linuxarm@...wei.com>,
        <minyard@....org>, <devicetree@...r.kernel.org>,
        <linux-arch@...r.kernel.org>, <rdunlap@...radead.org>,
        <gregkh@...uxfoundation.org>, <akpm@...ux-foundation.org>,
        <frowand.list@...il.com>, <agraf@...e.de>
Subject: [PATCH v17 07/10] ACPI / scan: rename acpi_is_serial_bus_slave() to widen use

Currently the ACPI scan has special handling for serial bus
slaves, in that it makes it the responsibility of the the slave
device's parent to enumerate the device.

To support in future other types of slave devices which require
the same special handling, but where the bus is not strictly a
serial bus - such as devices on the HiSilicon LPC controller bus -
rename acpi_is_serial_bus_slave() to
acpi_device_enumeration_by_parent(), so that the name can fit the
wider purpose.

Associated device flag acpi_device_flags.serial_bus_slave is also
renamed to .enumeration_by_parent.

Signed-off-by: John Garry <john.garry@...wei.com>
---
 drivers/acpi/scan.c     | 19 ++++++++++---------
 include/acpi/acpi_bus.h |  2 +-
 2 files changed, 11 insertions(+), 10 deletions(-)

diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index 8e63d93..f9e7904 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -1524,7 +1524,7 @@ static int acpi_check_serial_bus_slave(struct acpi_resource *ares, void *data)
 	return -1;
 }
 
-static bool acpi_is_serial_bus_slave(struct acpi_device *device)
+static bool acpi_device_enumeration_by_parent(struct acpi_device *device)
 {
 	struct list_head resource_list;
 	bool is_serial_bus_slave = false;
@@ -1560,7 +1560,8 @@ void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
 	acpi_bus_get_flags(device);
 	device->flags.match_driver = false;
 	device->flags.initialized = true;
-	device->flags.serial_bus_slave = acpi_is_serial_bus_slave(device);
+	device->flags.enumeration_by_parent =
+		acpi_device_enumeration_by_parent(device);
 	acpi_device_clear_enumerated(device);
 	device_initialize(&device->dev);
 	dev_set_uevent_suppress(&device->dev, true);
@@ -1858,10 +1859,10 @@ static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
 static void acpi_default_enumeration(struct acpi_device *device)
 {
 	/*
-	 * Do not enumerate SPI/I2C/UART slaves as they will be enumerated by
-	 * their respective parents.
+	 * Do not enumerate devices with enumeration_by_parent flag set as
+	 * they will be enumerated by their respective parents.
 	 */
-	if (!device->flags.serial_bus_slave) {
+	if (!device->flags.enumeration_by_parent) {
 		acpi_create_platform_device(device, NULL);
 		acpi_device_set_enumerated(device);
 	} else {
@@ -1958,7 +1959,7 @@ static void acpi_bus_attach(struct acpi_device *device)
 		return;
 
 	device->flags.match_driver = true;
-	if (ret > 0 && !device->flags.serial_bus_slave) {
+	if (ret > 0 && !device->flags.enumeration_by_parent) {
 		acpi_device_set_enumerated(device);
 		goto ok;
 	}
@@ -1967,10 +1968,10 @@ static void acpi_bus_attach(struct acpi_device *device)
 	if (ret < 0)
 		return;
 
-	if (!device->pnp.type.platform_id && !device->flags.serial_bus_slave)
-		acpi_device_set_enumerated(device);
-	else
+	if (device->pnp.type.platform_id || device->flags.enumeration_by_parent)
 		acpi_default_enumeration(device);
+	else
+		acpi_device_set_enumerated(device);
 
  ok:
 	list_for_each_entry(child, &device->children, node)
diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
index c9608b0..ba4dd54 100644
--- a/include/acpi/acpi_bus.h
+++ b/include/acpi/acpi_bus.h
@@ -215,7 +215,7 @@ struct acpi_device_flags {
 	u32 of_compatible_ok:1;
 	u32 coherent_dma:1;
 	u32 cca_seen:1;
-	u32 serial_bus_slave:1;
+	u32 enumeration_by_parent:1;
 	u32 reserved:19;
 };
 
-- 
1.9.1