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

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Date:   Mon, 19 Mar 2018 11:27:25 +0100
From:   "Rafael J. Wysocki" <rjw@...ysocki.net>
To:     John Garry <john.garry@...wei.com>
Cc:     mika.westerberg@...ux.intel.com, rafael@...nel.org,
        lorenzo.pieralisi@....com, 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, 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: Re: [PATCH v17 07/10] ACPI / scan: rename acpi_is_serial_bus_slave() to widen use

On Wednesday, March 14, 2018 7:15:56 PM CET John Garry wrote:
> 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>

Acked-by: Rafael J. Wysocki <rafael.j.wysocki@...el.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;
>  };
>  
>