linux-kernel - Re: [RFC PATCH 2/2] ata: ahci_platform: Add ACPI

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Date:	Thu, 18 Dec 2014 10:02:35 +0100
From:	Hans de Goede <hdegoede@...hat.com>
To:	Suravee Suthikulpanit <suravee.suthikulpanit@....com>,
	rjw@...ysocki.net, lenb@...nel.org, tj@...nel.org, arnd@...db.de,
	mjg59@...f.ucam.org
CC:	hanjun.guo@...aro.org, leo.duran@....com,
	graeme.gregory@...aro.org, linux-ide@...r.kernel.org,
	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
	linaro-acpi@...ts.linaro.org
Subject: Re: [RFC PATCH 2/2] ata: ahci_platform: Add ACPI _CLS matching

Hi,

On 18-12-14 00:16, Suravee Suthikulpanit wrote:
> From: Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>
>
> This patch adds ACPI supports for AHCI platform driver, which uses _CLS
> method to match the device.
>
> The following is an example of ASL structure in DSDT for a SATA controller,
> which contains _CLS package to be matched by the ahci_platform driver:
>
>    Device (AHC0) // AHCI Controller
>    {
>      Name(_HID, "AMDI0600")
>      Name (_CCA, 1)
>      Name (_CLS, Package (3)
>      {
>        0x01, // Base Class: Mass Storage
>        0x06, // Sub-Class: serial ATA
>        0x01, // Interface: AHCI
>      })
>      Name (_CRS, ResourceTemplate ()
>      {
>        Memory32Fixed (ReadWrite, 0xE0300000, 0x00010000)
>        Interrupt (ResourceConsumer, Level, ActiveHigh, Exclusive,,,) { 387 }
>      })
>    }
>
> Also, since ATA driver should not require PCI support for ATA_ACPI,
> this patch removes dependency in the driver/ata/Kconfig.
>
> Signed-off-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>

The ahci_platform changes done here look good to me:

Acked-by: Hans de Goede <hdegoede@...hat.com>

Regards,

Hans


> ---
>   drivers/ata/Kconfig         |  2 +-
>   drivers/ata/ahci_platform.c | 10 ++++++++++
>   2 files changed, 11 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/ata/Kconfig b/drivers/ata/Kconfig
> index cd4cccb..edb00c6 100644
> --- a/drivers/ata/Kconfig
> +++ b/drivers/ata/Kconfig
> @@ -48,7 +48,7 @@ config ATA_VERBOSE_ERROR
>
>   config ATA_ACPI
>   	bool "ATA ACPI Support"
> -	depends on ACPI && PCI
> +	depends on ACPI
>   	default y
>   	help
>   	  This option adds support for ATA-related ACPI objects.
> diff --git a/drivers/ata/ahci_platform.c b/drivers/ata/ahci_platform.c
> index 06f1d59..54568ec 100644
> --- a/drivers/ata/ahci_platform.c
> +++ b/drivers/ata/ahci_platform.c
> @@ -20,6 +20,9 @@
>   #include <linux/platform_device.h>
>   #include <linux/libata.h>
>   #include <linux/ahci_platform.h>
> +#ifdef CONFIG_ATA_ACPI
> +#include <linux/acpi.h>
> +#endif
>   #include "ahci.h"
>
>   static const struct ata_port_info ahci_port_info = {
> @@ -71,6 +74,10 @@ static const struct of_device_id ahci_of_match[] = {
>   };
>   MODULE_DEVICE_TABLE(of, ahci_of_match);
>
> +#ifdef CONFIG_ATA_ACPI
> +static const struct acpi_device_cls ahci_cls = {0x01, 0x06, 0x01};
> +#endif
> +
>   static struct platform_driver ahci_driver = {
>   	.probe = ahci_probe,
>   	.remove = ata_platform_remove_one,
> @@ -78,6 +85,9 @@ static struct platform_driver ahci_driver = {
>   		.name = "ahci",
>   		.owner = THIS_MODULE,
>   		.of_match_table = ahci_of_match,
> +#ifdef CONFIG_ATA_ACPI
> +		.acpi_cls = &ahci_cls,
> +#endif
>   		.pm = &ahci_pm_ops,
>   	},
>   };
>
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