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Subject[PATCH v2] platform/mellanox: fix the mlx-bootctl sysfs
Date
This is a follow-up commit for the sysfs attributes to change
from DRIVER_ATTR to DEVICE_ATTR according to some initial comments.
In such case, it's better to point the sysfs path to the device
itself instead of the driver. This commit adds the missing
sysfs_create_group() so the attributes can be created under the
device. The ABI document is also updated.

Fixes: 79e29cb8fbc5 ("platform/mellanox: Add bootctl driver for Mellanox BlueField Soc")
Signed-off-by: Liming Sun <lsun@mellanox.com>
---
v1->v2: Added the Fixes tag according to Andy's comment.
v1: Initial version.
---
Documentation/ABI/testing/sysfs-platform-mellanox-bootctl | 10 +++++-----
drivers/platform/mellanox/mlxbf-bootctl.c | 15 +++++++++++++++
2 files changed, 20 insertions(+), 5 deletions(-)

diff --git a/Documentation/ABI/testing/sysfs-platform-mellanox-bootctl b/Documentation/ABI/testing/sysfs-platform-mellanox-bootctl
index c65a805..401d202 100644
--- a/Documentation/ABI/testing/sysfs-platform-mellanox-bootctl
+++ b/Documentation/ABI/testing/sysfs-platform-mellanox-bootctl
@@ -1,4 +1,4 @@
-What: /sys/bus/platform/devices/MLNXBF04:00/driver/lifecycle_state
+What: /sys/bus/platform/devices/MLNXBF04:00/lifecycle_state
Date: Oct 2019
KernelVersion: 5.5
Contact: "Liming Sun <lsun@mellanox.com>"
@@ -10,7 +10,7 @@ Description:
GA Non-Secured - Non-Secure chip and not able to change state
RMA - Return Merchandise Authorization

-What: /sys/bus/platform/devices/MLNXBF04:00/driver/post_reset_wdog
+What: /sys/bus/platform/devices/MLNXBF04:00/post_reset_wdog
Date: Oct 2019
KernelVersion: 5.5
Contact: "Liming Sun <lsun@mellanox.com>"
@@ -19,7 +19,7 @@ Description:
to reboot the chip and recover it to the old state if the new
boot partition fails.

-What: /sys/bus/platform/devices/MLNXBF04:00/driver/reset_action
+What: /sys/bus/platform/devices/MLNXBF04:00/reset_action
Date: Oct 2019
KernelVersion: 5.5
Contact: "Liming Sun <lsun@mellanox.com>"
@@ -30,7 +30,7 @@ Description:
emmc - boot from the onchip eMMC
emmc_legacy - boot from the onchip eMMC in legacy (slow) mode

-What: /sys/bus/platform/devices/MLNXBF04:00/driver/second_reset_action
+What: /sys/bus/platform/devices/MLNXBF04:00/second_reset_action
Date: Oct 2019
KernelVersion: 5.5
Contact: "Liming Sun <lsun@mellanox.com>"
@@ -44,7 +44,7 @@ Description:
swap_emmc - swap the primary / secondary boot partition
none - cancel the action

-What: /sys/bus/platform/devices/MLNXBF04:00/driver/secure_boot_fuse_state
+What: /sys/bus/platform/devices/MLNXBF04:00/secure_boot_fuse_state
Date: Oct 2019
KernelVersion: 5.5
Contact: "Liming Sun <lsun@mellanox.com>"
diff --git a/drivers/platform/mellanox/mlxbf-bootctl.c b/drivers/platform/mellanox/mlxbf-bootctl.c
index 61753b6..9482eab 100644
--- a/drivers/platform/mellanox/mlxbf-bootctl.c
+++ b/drivers/platform/mellanox/mlxbf-bootctl.c
@@ -282,9 +282,16 @@ static bool mlxbf_bootctl_guid_match(const guid_t *guid,
static int mlxbf_bootctl_probe(struct platform_device *pdev)
{
struct arm_smccc_res res = { 0 };
+ struct device *dev = &pdev->dev;
guid_t guid;
int ret;

+ ret = sysfs_create_group(&dev->kobj, &mlxbf_bootctl_group);
+ if (ret) {
+ dev_err(dev, "failed to create attributes, err=%d\n", ret);
+ return ret;
+ }
+
/* Ensure we have the UUID we expect for this service. */
arm_smccc_smc(MLXBF_BOOTCTL_SIP_SVC_UID, 0, 0, 0, 0, 0, 0, 0, &res);
guid_parse(mlxbf_bootctl_svc_uuid_str, &guid);
@@ -305,8 +312,16 @@ static int mlxbf_bootctl_probe(struct platform_device *pdev)
return 0;
}

+static int mlxbf_bootctl_remove(struct platform_device *pdev)
+{
+ sysfs_remove_group(&pdev->dev.kobj, &mlxbf_bootctl_group);
+
+ return 0;
+}
+
static struct platform_driver mlxbf_bootctl_driver = {
.probe = mlxbf_bootctl_probe,
+ .remove = mlxbf_bootctl_remove,
.driver = {
.name = "mlxbf-bootctl",
.groups = mlxbf_bootctl_groups,
--
1.8.3.1
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