linux-kernel - [PATCH v6 13/20] gpio: uapi: document uAPI v1 as deprecated

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Message-Id: <20200831032006.1019978-14-warthog618@gmail.com>
Date:   Mon, 31 Aug 2020 11:19:59 +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 v6 13/20] 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 0eb1f53b47e0..4af67415d73e 100644
--- a/include/uapi/linux/gpio.h
+++ b/include/uapi/linux/gpio.h
@@ -274,6 +274,9 @@ struct gpio_v2_line_event {
 
 /*
  *  ABI v1
+ *
+ * This version of the ABI is deprecated and will be removed in the future.
+ * Use the latest version of the ABI, defined above, instead.
  */
 
 /* Informational flags */
@@ -297,6 +300,9 @@ struct gpio_v2_line_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 is part of ABI v1 and is deprecated.
+ * Use struct gpio_v2_line_info instead.
  */
 struct gpioline_info {
 	__u32 line_offset;
@@ -328,6 +334,9 @@ 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 is part of ABI v1 and is deprecated.
+ * Use struct gpio_v2_line_info_changed instead.
  */
 struct gpioline_info_changed {
 	struct gpioline_info info;
@@ -367,6 +376,9 @@ 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 is part of ABI v1 and is deprecated.
+ * Use struct gpio_v2_line_request instead.
  */
 struct gpiohandle_request {
 	__u32 lineoffsets[GPIOHANDLES_MAX];
@@ -386,6 +398,9 @@ 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 is part of ABI v1 and is deprecated.
+ * Use struct gpio_v2_line_config instead.
  */
 struct gpiohandle_config {
 	__u32 flags;
@@ -398,6 +413,9 @@ 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 is part of ABI v1 and is deprecated.
+ * Use struct gpio_v2_line_values instead.
  */
 struct gpiohandle_data {
 	__u8 values[GPIOHANDLES_MAX];
@@ -421,6 +439,9 @@ 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 is part of ABI v1 and is deprecated.
+ * Use struct gpio_v2_line_request instead.
  */
 struct gpioevent_request {
 	__u32 lineoffset;
@@ -440,6 +461,9 @@ 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 is part of ABI v1 and is deprecated.
+ * Use struct gpio_v2_line_event instead.
  */
 struct gpioevent_data {
 	__u64 timestamp;
@@ -464,6 +488,8 @@ 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)
-- 
2.28.0