linux-kernel - [PATCH 19/22] gpio: uapi: document uAPI V1 as deprecated

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Date:   Tue, 23 Jun 2020 12:01:04 +0800
From:   Kent Gibson <warthog618@...il.com>
To:     linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org,
        bgolaszewski@...libre.com, linus.walleij@...aro.org
Cc:     Kent Gibson <warthog618@...il.com>
Subject: [PATCH 19/22] gpio: uapi: document uAPI V1 as deprecated

Update uAPI documentation to deprecate V1 structs and ioctls.

Signed-off-by: Kent Gibson <warthog618@...il.com>

---
 include/uapi/linux/gpio.h | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/include/uapi/linux/gpio.h b/include/uapi/linux/gpio.h
index e4ed6f79e332..752d63f56b0d 100644
--- a/include/uapi/linux/gpio.h
+++ b/include/uapi/linux/gpio.h
@@ -238,6 +238,9 @@ struct gpioline_event {
 
 /*
  *  ABI V1
+ *
+ * This version of the ABI is deprecated and will be removed in the future.
+ * Use the latest version if the ABI, defined above, instead.
  */
 
 /* Informational flags */
@@ -261,6 +264,9 @@ struct gpioline_event {
  * @consumer: a functional name for the consumer of this GPIO line as set by
  * whatever is using it, will be empty if there is no current user but may
  * also be empty if the consumer doesn't set this up
+ *
+ * This struct part of ABI V1 and is deprecated.
+ * Use struct gpioline_info_v2 instead.
  */
 struct gpioline_info {
 	__u32 line_offset;
@@ -292,6 +298,9 @@ enum {
  * guarantee there are no implicit holes between it and subsequent members.
  * The 20-byte padding at the end makes sure we don't add any implicit padding
  * at the end of the structure on 64-bit architectures.
+ *
+ * This struct part of ABI V1 and is deprecated.
+ * Use struct gpioline_info_changed_v2 instead.
  */
 struct gpioline_info_changed {
 	struct gpioline_info info;
@@ -331,6 +340,9 @@ struct gpioline_info_changed {
  * @fd: if successful this field will contain a valid anonymous file handle
  * after a GPIO_GET_LINEHANDLE_IOCTL operation, zero or negative value
  * means error
+ *
+ * This struct part of ABI V1 and is deprecated.
+ * Use struct gpioline_request instead.
  */
 struct gpiohandle_request {
 	__u32 lineoffsets[GPIOHANDLES_MAX];
@@ -350,6 +362,9 @@ struct gpiohandle_request {
  * this specifies the default output value, should be 0 (low) or
  * 1 (high), anything else than 0 or 1 will be interpreted as 1 (high)
  * @padding: reserved for future use and should be zero filled
+ *
+ * This struct part of ABI V1 and is deprecated.
+ * Use struct gpioline_config instead.
  */
 struct gpiohandle_config {
 	__u32 flags;
@@ -362,6 +377,9 @@ struct gpiohandle_config {
  * @values: when getting the state of lines this contains the current
  * state of a line, when setting the state of lines these should contain
  * the desired target state
+ *
+ * This struct part of ABI V1 and is deprecated.
+ * Use struct gpioline_values instead.
  */
 struct gpiohandle_data {
 	__u8 values[GPIOHANDLES_MAX];
@@ -385,6 +403,9 @@ struct gpiohandle_data {
  * @fd: if successful this field will contain a valid anonymous file handle
  * after a GPIO_GET_LINEEVENT_IOCTL operation, zero or negative value
  * means error
+ *
+ * This struct part of ABI V1 and is deprecated.
+ * Use struct gpioline_request instead.
  */
 struct gpioevent_request {
 	__u32 lineoffset;
@@ -404,6 +425,9 @@ struct gpioevent_request {
  * struct gpioevent_data - The actual event being pushed to userspace
  * @timestamp: best estimate of time of event occurrence, in nanoseconds
  * @id: event identifier
+ *
+ * This struct part of ABI V1 and is deprecated.
+ * Use struct gpioline_event instead.
  */
 struct gpioevent_data {
 	__u64 timestamp;
@@ -428,6 +452,8 @@ struct gpioevent_data {
 
 /*
  * V1 ioctl()s
+ *
+ * These ioctl()s are deprecated.  Use the V2 equivalent instead.
  */
 #define GPIO_GET_LINEINFO_IOCTL _IOWR(0xB4, 0x02, struct gpioline_info)
 #define GPIO_GET_LINEHANDLE_IOCTL _IOWR(0xB4, 0x03, struct gpiohandle_request)
-- 
2.27.0