Merge tag 'scmi-updates-6.12' of https://git.kernel.org/pub/scm/linux/kernel/git/sudeep.holla/linux into soc/drivers

Arm SCMI updates for v6.12

Few main features include:

1. SCMI transport as stand-alone drivers

    Currently the SCMI transport layer is being built embedded into in
    the core SCMI stack. Some of these transports, despite being currently
    part of the main SCMI module, are indeed also registered with different
    subsystems like optee or virtio, and actively probed also by those.
    This leads to a few awkward and convoluted tricks to properly handle
    such interactions at boot time in the SCMI stack.

    This change adds the new logic to the core SCMI stack so that each
    existing transport is transitioned to be a standi-alone driver. With
    that all the probe deferral and awkward retries between the SCMI
    core stack and the transports has been removed, since no more needed.

2. Support for obtaining transport descriptors from the devicetree

    SCMI platform firmwares might have different designs depending on
    the platform. Some of the transport descriptors rely on such design.
    E.g. the maximum receive channel timeout value might vary depending
    on the specific underlying hardware and firmware design choices.

    This change adds support for max-rx-timeout-ms property to describe
    the transport needs of a specific platform design. It will be extended
    in the future to obtain other such hardware/firmware dependent
    transport related descriptors.

3. NXP i.MX95 specific SCMI vendor protocol extensions

    SCMI specification allows vendor or platform-specific extensions to
    the interface. NXP i.MX95 System Manager(SM) that implements SCMI
    extends the interface to implement couple of vendor/platform specific
    protocol, namely:
    a. Battery Backed Module(BBM) Protocol

       This protocol is intended provide access to the battery-backed
       module. This contains persistent storage (GPR), an RTC, and the
       ON/OFF button. The protocol can also provide access to similar
       functions implemented via external board components.

    b. MISC Protocol for misc settings

        This includes controls that are misc settings/actions that must
	be exposed from the SM to agents. They are device specific and
	are usually define to access bit fields in various mix block
	control modules, IOMUX_GPR, and other GPR/CSR owned by the SM.

4. SCMI debug/tracking metrics

    Since SCMI involves interaction with the entity(software, firmware
    and/or hardware) providing services or features, it is quite useful
    to track certain metrics(for pure debugging purposes) like how many
    messages were sent or received, were there any failures, what kind
    of failures, ..etc. This feature adds support for the same via debugfs.

Apart from these main features, there are some miscellaneous updates, fixes
and cleanups.

* tag 'scmi-updates-6.12' of https://git.kernel.org/pub/scm/linux/kernel/git/sudeep.holla/linux: (31 commits)
  rtc: support i.MX95 BBM RTC
  input: keyboard: support i.MX95 BBM module
  firmware: imx: Add i.MX95 MISC driver
  firmware: arm_scmi: Add initial support for i.MX MISC protocol
  firmware: arm_scmi: Add initial support for i.MX BBM protocol
  firmware: arm_scmi: Add NXP i.MX95 SCMI documentation
  dt-bindings: firmware: Add i.MX95 SCMI Extension protocol
  firmware: arm_scmi: Replace comma with the semicolon
  firmware: arm_scmi: Replace the use of of_node_put() to __free(device_node)
  firmware: arm_scmi: Fix trivial whitespace/coding style issues
  firmware: arm_scmi: Use max-rx-timeout-ms from devicetree
  dt-bindings: firmware: arm,scmi: Introduce property max-rx-timeout-ms
  firmware: arm_scmi: Remove const from transport descriptors
  firmware: arm_scmi: Simplify with scoped for each OF child loop
  firmware: arm_scmi: Update various protocols versions
  firmware: arm_scmi: Remove legacy transport-layer code
  firmware: arm_scmi: Make VirtIO transport a standalone driver
  firmware: arm_scmi: Make OPTEE transport a standalone driver
  firmware: arm_scmi: Make SMC transport a standalone driver
  firmware: arm_scmi: Make MBOX transport a standalone driver
  ...

Link: https://lore.kernel.org/r/20240830135918.2383664-1-sudeep.holla@arm.com
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

3 files changed, 237 insertions, 0 deletions

diff --git a/drivers/input/keyboard/Kconfig b/drivers/input/keyboard/Kconfig
index 1d0c5f4c0f99..1c3fef7d34af 100644
--- a/drivers/input/keyboard/Kconfig
+++ b/drivers/input/keyboard/Kconfig
@@ -466,6 +466,17 @@ config KEYBOARD_IMX
 	  To compile this driver as a module, choose M here: the
 	  module will be called imx_keypad.
 
+config KEYBOARD_IMX_BBM_SCMI
+	tristate "IMX BBM SCMI Key Driver"
+	depends on IMX_SCMI_BBM_EXT || COMPILE_TEST
+	default y if ARCH_MXC
+	help
+	  This is the BBM key driver for NXP i.MX SoCs managed through
+	  SCMI protocol.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called scmi-imx-bbm-key.
+
 config KEYBOARD_IMX_SC_KEY
 	tristate "IMX SCU Key Driver"
 	depends on IMX_SCU
diff --git a/drivers/input/keyboard/Makefile b/drivers/input/keyboard/Makefile
index aecef00c5d09..624c90adde89 100644
--- a/drivers/input/keyboard/Makefile
+++ b/drivers/input/keyboard/Makefile
@@ -31,6 +31,7 @@ obj-$(CONFIG_KEYBOARD_IPAQ_MICRO)	+= ipaq-micro-keys.o
 obj-$(CONFIG_KEYBOARD_IQS62X)		+= iqs62x-keys.o
 obj-$(CONFIG_KEYBOARD_IMX)		+= imx_keypad.o
 obj-$(CONFIG_KEYBOARD_IMX_SC_KEY)	+= imx_sc_key.o
+obj-$(CONFIG_KEYBOARD_IMX_BBM_SCMI)	+= imx-sm-bbm-key.o
 obj-$(CONFIG_KEYBOARD_HP6XX)		+= jornada680_kbd.o
 obj-$(CONFIG_KEYBOARD_HP7XX)		+= jornada720_kbd.o
 obj-$(CONFIG_KEYBOARD_LKKBD)		+= lkkbd.o
diff --git a/drivers/input/keyboard/imx-sm-bbm-key.c b/drivers/input/keyboard/imx-sm-bbm-key.c
new file mode 100644
index 000000000000..96486bd23d60
--- /dev/null
+++ b/drivers/input/keyboard/imx-sm-bbm-key.c
@@ -0,0 +1,225 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright 2024 NXP.
+ */
+
+#include <linux/input.h>
+#include <linux/jiffies.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/rtc.h>
+#include <linux/scmi_protocol.h>
+#include <linux/scmi_imx_protocol.h>
+#include <linux/suspend.h>
+
+#define DEBOUNCE_TIME		30
+#define REPEAT_INTERVAL		60
+
+struct scmi_imx_bbm {
+	struct scmi_protocol_handle *ph;
+	const struct scmi_imx_bbm_proto_ops *ops;
+	struct notifier_block nb;
+	int keycode;
+	int keystate;  /* 1:pressed */
+	bool suspended;
+	struct delayed_work check_work;
+	struct input_dev *input;
+};
+
+static void scmi_imx_bbm_pwrkey_check_for_events(struct work_struct *work)
+{
+	struct scmi_imx_bbm *bbnsm = container_of(to_delayed_work(work),
+						  struct scmi_imx_bbm, check_work);
+	struct scmi_protocol_handle *ph = bbnsm->ph;
+	struct input_dev *input = bbnsm->input;
+	u32 state = 0;
+	int ret;
+
+	ret = bbnsm->ops->button_get(ph, &state);
+	if (ret) {
+		pr_err("%s: %d\n", __func__, ret);
+		return;
+	}
+
+	pr_debug("%s: state: %d, keystate %d\n", __func__, state, bbnsm->keystate);
+
+	/* only report new event if status changed */
+	if (state ^ bbnsm->keystate) {
+		bbnsm->keystate = state;
+		input_event(input, EV_KEY, bbnsm->keycode, state);
+		input_sync(input);
+		pm_relax(bbnsm->input->dev.parent);
+		pr_debug("EV_KEY: %x\n", bbnsm->keycode);
+	}
+
+	/* repeat check if pressed long */
+	if (state)
+		schedule_delayed_work(&bbnsm->check_work, msecs_to_jiffies(REPEAT_INTERVAL));
+}
+
+static int scmi_imx_bbm_pwrkey_event(struct scmi_imx_bbm *bbnsm)
+{
+	struct input_dev *input = bbnsm->input;
+
+	pm_wakeup_event(input->dev.parent, 0);
+
+	/*
+	 * Directly report key event after resume to make no key press
+	 * event is missed.
+	 */
+	if (READ_ONCE(bbnsm->suspended)) {
+		bbnsm->keystate = 1;
+		input_event(input, EV_KEY, bbnsm->keycode, 1);
+		input_sync(input);
+		WRITE_ONCE(bbnsm->suspended, false);
+	}
+
+	schedule_delayed_work(&bbnsm->check_work, msecs_to_jiffies(DEBOUNCE_TIME));
+
+	return 0;
+}
+
+static void scmi_imx_bbm_pwrkey_act(void *pdata)
+{
+	struct scmi_imx_bbm *bbnsm = pdata;
+
+	cancel_delayed_work_sync(&bbnsm->check_work);
+}
+
+static int scmi_imx_bbm_key_notifier(struct notifier_block *nb, unsigned long event, void *data)
+{
+	struct scmi_imx_bbm *bbnsm = container_of(nb, struct scmi_imx_bbm, nb);
+	struct scmi_imx_bbm_notif_report *r = data;
+
+	if (r->is_button) {
+		pr_debug("BBM Button Power key pressed\n");
+		scmi_imx_bbm_pwrkey_event(bbnsm);
+	} else {
+		/* Should never reach here */
+		pr_err("Unexpected BBM event: %s\n", __func__);
+	}
+
+	return 0;
+}
+
+static int scmi_imx_bbm_pwrkey_init(struct scmi_device *sdev)
+{
+	const struct scmi_handle *handle = sdev->handle;
+	struct device *dev = &sdev->dev;
+	struct scmi_imx_bbm *bbnsm = dev_get_drvdata(dev);
+	struct input_dev *input;
+	int ret;
+
+	if (device_property_read_u32(dev, "linux,code", &bbnsm->keycode)) {
+		bbnsm->keycode = KEY_POWER;
+		dev_warn(dev, "key code is not specified, using default KEY_POWER\n");
+	}
+
+	INIT_DELAYED_WORK(&bbnsm->check_work, scmi_imx_bbm_pwrkey_check_for_events);
+
+	input = devm_input_allocate_device(dev);
+	if (!input) {
+		dev_err(dev, "failed to allocate the input device for SCMI IMX BBM\n");
+		return -ENOMEM;
+	}
+
+	input->name = dev_name(dev);
+	input->phys = "bbnsm-pwrkey/input0";
+	input->id.bustype = BUS_HOST;
+
+	input_set_capability(input, EV_KEY, bbnsm->keycode);
+
+	ret = devm_add_action_or_reset(dev, scmi_imx_bbm_pwrkey_act, bbnsm);
+	if (ret) {
+		dev_err(dev, "failed to register remove action\n");
+		return ret;
+	}
+
+	bbnsm->input = input;
+
+	bbnsm->nb.notifier_call = &scmi_imx_bbm_key_notifier;
+	ret = handle->notify_ops->devm_event_notifier_register(sdev, SCMI_PROTOCOL_IMX_BBM,
+							       SCMI_EVENT_IMX_BBM_BUTTON,
+							       NULL, &bbnsm->nb);
+
+	if (ret)
+		dev_err(dev, "Failed to register BBM Button Events %d:", ret);
+
+	ret = input_register_device(input);
+	if (ret) {
+		dev_err(dev, "failed to register input device\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+static int scmi_imx_bbm_key_probe(struct scmi_device *sdev)
+{
+	const struct scmi_handle *handle = sdev->handle;
+	struct device *dev = &sdev->dev;
+	struct scmi_protocol_handle *ph;
+	struct scmi_imx_bbm *bbnsm;
+	int ret;
+
+	if (!handle)
+		return -ENODEV;
+
+	bbnsm = devm_kzalloc(dev, sizeof(*bbnsm), GFP_KERNEL);
+	if (!bbnsm)
+		return -ENOMEM;
+
+	bbnsm->ops = handle->devm_protocol_get(sdev, SCMI_PROTOCOL_IMX_BBM, &ph);
+	if (IS_ERR(bbnsm->ops))
+		return PTR_ERR(bbnsm->ops);
+
+	bbnsm->ph = ph;
+
+	device_init_wakeup(dev, true);
+
+	dev_set_drvdata(dev, bbnsm);
+
+	ret = scmi_imx_bbm_pwrkey_init(sdev);
+	if (ret)
+		device_init_wakeup(dev, false);
+
+	return ret;
+}
+
+static int __maybe_unused scmi_imx_bbm_key_suspend(struct device *dev)
+{
+	struct scmi_imx_bbm *bbnsm = dev_get_drvdata(dev);
+
+	WRITE_ONCE(bbnsm->suspended, true);
+
+	return 0;
+}
+
+static int __maybe_unused scmi_imx_bbm_key_resume(struct device *dev)
+{
+	return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(scmi_imx_bbm_pm_key_ops, scmi_imx_bbm_key_suspend,
+			 scmi_imx_bbm_key_resume);
+
+static const struct scmi_device_id scmi_id_table[] = {
+	{ SCMI_PROTOCOL_IMX_BBM, "imx-bbm-key" },
+	{ },
+};
+MODULE_DEVICE_TABLE(scmi, scmi_id_table);
+
+static struct scmi_driver scmi_imx_bbm_key_driver = {
+	.driver = {
+		.pm = &scmi_imx_bbm_pm_key_ops,
+	},
+	.name = "scmi-imx-bbm-key",
+	.probe = scmi_imx_bbm_key_probe,
+	.id_table = scmi_id_table,
+};
+module_scmi_driver(scmi_imx_bbm_key_driver);
+
+MODULE_AUTHOR("Peng Fan <peng.fan@nxp.com>");
+MODULE_DESCRIPTION("IMX SM BBM Key driver");
+MODULE_LICENSE("GPL");