Merge tag 'i3c/for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linuxgrafted

Pull I3C updates from Alexandre Belloni:
 "A new driver this cycle, for the AMD AXI I3C controller.

  There are also new features such as IBI wakeup support, SETAASA device
  discovery and ACPI support for the the DAA methods, meaning we can now
  communicate with the SPD devices on DDR5 modules.

  New driver:
   - AMD AXI I3C master controller

  Subsystem:
   - I3C Common Command Code (CCC) handling improvements, especially
     around GET CCCs
   - SETAASA device discovery support
   - ACPI support for all existing DAA methods like SETDASA, SETNEWDA as
     well as I2C devices on I3C bus
   - IBI-based wakeup support

  Drivers:
   - dw: SETAASA support
   - mipi-i3c-hci: advertise IBI wakeup capability, AMD_PT I3C
     controller support, PIO queue management support for HCI v1.2
   - renesas: improve suspend to RAM support, add runtime PM support"

* tag 'i3c/for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linux: (70 commits)
  i3c: dw: reduce do_daa time if there's no client
  i3c: mipi-i3c-hci: Add support for AMD_PT I3C controller
  i3c: mipi-i3c-hci: Add PIO queue management support for HCI v1.2
  i3c: mipi-i3c-hci: Fix missing STAT_IBI_STATUS_THLD in PIO mode
  i3c: dw: rename "pclk" to "apb" to match dt-binding
  i3c: dw: make struct dw_i3c_cmd smaller
  i3c: dw: use COMMAND_PORT_TRANSFER_ARG instead of hardcoding
  i3c: renesas: Don't register devices when ENTDAA times out
  i3c: master: dw-i3c-master: fix OD timing for first broadcast
  i3c: mipi-i3c-hci: Advertise IBI wakeup capability
  i3c: mipi-i3c-hci: Factor out i3c_hci_sysdev()
  i3c: mipi-i3c-hci-pci: Propagate I3C wakeup requirements to PCI
  i3c: master: Reject IBI requests from non-IBI-capable devices
  i3c: master: Add helper to query bus wakeup requirements
  i3c: master: Report wakeup events for IBIs
  i3c: master: Support IBI-based wakeup capability
  i3c: master: Fix potential UAF in i3c_device_match()
  i3c: master: Fix potential UAF in i3c_device_uevent()
  i3c: Make dev->desc locking assumptions explicit
  i3c: master: Fix use-after-free of master->this
  ...

3 files changed, 316 insertions, 0 deletions

diff --git a/drivers/pmdomain/xilinx/Kconfig b/drivers/pmdomain/xilinx/Kconfig
new file mode 100644
index 000000000..5242753d8
--- /dev/null
+++ b/drivers/pmdomain/xilinx/Kconfig
@@ -0,0 +1,10 @@
+# SPDX-License-Identifier: GPL-2.0
+
+config ZYNQMP_PM_DOMAINS
+	bool "Enable Zynq MPSoC generic PM domains"
+	default y
+	depends on PM && ZYNQMP_FIRMWARE
+	select PM_GENERIC_DOMAINS
+	help
+	  Say yes to enable device power management through PM domains
+	  If in doubt, say N.
diff --git a/drivers/pmdomain/xilinx/Makefile b/drivers/pmdomain/xilinx/Makefile
new file mode 100644
index 000000000..a706ab699
--- /dev/null
+++ b/drivers/pmdomain/xilinx/Makefile
@@ -0,0 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0
+obj-$(CONFIG_ZYNQMP_PM_DOMAINS)		+= zynqmp-pm-domains.o
diff --git a/drivers/pmdomain/xilinx/zynqmp-pm-domains.c b/drivers/pmdomain/xilinx/zynqmp-pm-domains.c
new file mode 100644
index 000000000..b5aedd6e3
--- /dev/null
+++ b/drivers/pmdomain/xilinx/zynqmp-pm-domains.c
@@ -0,0 +1,304 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * ZynqMP Generic PM domain support
+ *
+ *  Copyright (C) 2015-2019 Xilinx, Inc.
+ *
+ *  Davorin Mista <davorin.mista@aggios.com>
+ *  Jolly Shah <jollys@xilinx.com>
+ *  Rajan Vaja <rajan.vaja@xilinx.com>
+ */
+
+#include <linux/err.h>
+#include <linux/list.h>
+#include <linux/module.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+#include <linux/pm_domain.h>
+#include <linux/slab.h>
+
+#include <linux/firmware/xlnx-zynqmp.h>
+
+#define ZYNQMP_NUM_DOMAINS		(100)
+
+static int min_capability;
+
+/**
+ * struct zynqmp_pm_domain - Wrapper around struct generic_pm_domain
+ * @gpd:		Generic power domain
+ * @node_id:		PM node ID corresponding to device inside PM domain
+ * @requested:		The PM node mapped to the PM domain has been requested
+ */
+struct zynqmp_pm_domain {
+	struct generic_pm_domain gpd;
+	u32 node_id;
+	bool requested;
+};
+
+#define to_zynqmp_pm_domain(pm_domain) \
+	container_of(pm_domain, struct zynqmp_pm_domain, gpd)
+
+/**
+ * zynqmp_gpd_is_active_wakeup_path() - Check if device is in wakeup source
+ *					path
+ * @dev:	Device to check for wakeup source path
+ * @not_used:	Data member (not required)
+ *
+ * This function is checks device's child hierarchy and checks if any device is
+ * set as wakeup source.
+ *
+ * Return: 1 if device is in wakeup source path else 0
+ */
+static int zynqmp_gpd_is_active_wakeup_path(struct device *dev, void *not_used)
+{
+	int may_wakeup;
+
+	may_wakeup = device_may_wakeup(dev);
+	if (may_wakeup)
+		return may_wakeup;
+
+	return device_for_each_child(dev, NULL,
+			zynqmp_gpd_is_active_wakeup_path);
+}
+
+/**
+ * zynqmp_gpd_power_on() - Power on PM domain
+ * @domain:	Generic PM domain
+ *
+ * This function is called before devices inside a PM domain are resumed, to
+ * power on PM domain.
+ *
+ * Return: 0 on success, error code otherwise
+ */
+static int zynqmp_gpd_power_on(struct generic_pm_domain *domain)
+{
+	struct zynqmp_pm_domain *pd = to_zynqmp_pm_domain(domain);
+	int ret;
+
+	ret = zynqmp_pm_set_requirement(pd->node_id,
+					ZYNQMP_PM_CAPABILITY_ACCESS,
+					ZYNQMP_PM_MAX_QOS,
+					ZYNQMP_PM_REQUEST_ACK_BLOCKING);
+	if (ret) {
+		dev_err(&domain->dev,
+			"failed to set requirement to 0x%x for PM node id %d: %d\n",
+			ZYNQMP_PM_CAPABILITY_ACCESS, pd->node_id, ret);
+		return ret;
+	}
+
+	dev_dbg(&domain->dev, "set requirement to 0x%x for PM node id %d\n",
+		ZYNQMP_PM_CAPABILITY_ACCESS, pd->node_id);
+
+	return 0;
+}
+
+/**
+ * zynqmp_gpd_power_off() - Power off PM domain
+ * @domain:	Generic PM domain
+ *
+ * This function is called after devices inside a PM domain are suspended, to
+ * power off PM domain.
+ *
+ * Return: 0 on success, error code otherwise
+ */
+static int zynqmp_gpd_power_off(struct generic_pm_domain *domain)
+{
+	struct zynqmp_pm_domain *pd = to_zynqmp_pm_domain(domain);
+	int ret;
+	struct pm_domain_data *pdd, *tmp;
+	u32 capabilities = min_capability;
+	bool may_wakeup;
+
+	/* If domain is already released there is nothing to be done */
+	if (!pd->requested) {
+		dev_dbg(&domain->dev, "PM node id %d is already released\n",
+			pd->node_id);
+		return 0;
+	}
+
+	list_for_each_entry_safe(pdd, tmp, &domain->dev_list, list_node) {
+		/* If device is in wakeup path, set capability to WAKEUP */
+		may_wakeup = zynqmp_gpd_is_active_wakeup_path(pdd->dev, NULL);
+		if (may_wakeup) {
+			dev_dbg(pdd->dev, "device is in wakeup path in %s\n",
+				domain->name);
+			capabilities = ZYNQMP_PM_CAPABILITY_WAKEUP;
+			break;
+		}
+	}
+
+	ret = zynqmp_pm_set_requirement(pd->node_id, capabilities, 0,
+					ZYNQMP_PM_REQUEST_ACK_NO);
+	if (ret) {
+		dev_err(&domain->dev,
+			"failed to set requirement to 0x%x for PM node id %d: %d\n",
+			capabilities, pd->node_id, ret);
+		return ret;
+	}
+
+	dev_dbg(&domain->dev, "set requirement to 0x%x for PM node id %d\n",
+		capabilities, pd->node_id);
+
+	return 0;
+}
+
+/**
+ * zynqmp_gpd_attach_dev() - Attach device to the PM domain
+ * @domain:	Generic PM domain
+ * @dev:	Device to attach
+ *
+ * Return: 0 on success, error code otherwise
+ */
+static int zynqmp_gpd_attach_dev(struct generic_pm_domain *domain,
+				 struct device *dev)
+{
+	struct zynqmp_pm_domain *pd = to_zynqmp_pm_domain(domain);
+	int ret;
+
+	/* If this is not the first device to attach there is nothing to do */
+	if (domain->device_count)
+		return 0;
+
+	ret = zynqmp_pm_request_node(pd->node_id, 0, 0,
+				     ZYNQMP_PM_REQUEST_ACK_BLOCKING);
+	if (ret) {
+		dev_err(&domain->dev, "%s request failed for node %d: %d\n",
+			domain->name, pd->node_id, ret);
+		return ret;
+	}
+
+	pd->requested = true;
+
+	dev_dbg(&domain->dev, "%s requested PM node id %d\n",
+		dev_name(dev), pd->node_id);
+
+	return 0;
+}
+
+/**
+ * zynqmp_gpd_detach_dev() - Detach device from the PM domain
+ * @domain:	Generic PM domain
+ * @dev:	Device to detach
+ */
+static void zynqmp_gpd_detach_dev(struct generic_pm_domain *domain,
+				  struct device *dev)
+{
+	struct zynqmp_pm_domain *pd = to_zynqmp_pm_domain(domain);
+	int ret;
+
+	/* If this is not the last device to detach there is nothing to do */
+	if (domain->device_count)
+		return;
+
+	ret = zynqmp_pm_release_node(pd->node_id);
+	if (ret) {
+		dev_err(&domain->dev, "failed to release PM node id %d: %d\n",
+			pd->node_id, ret);
+		return;
+	}
+
+	pd->requested = false;
+
+	dev_dbg(&domain->dev, "%s released PM node id %d\n",
+		dev_name(dev), pd->node_id);
+}
+
+static struct generic_pm_domain *zynqmp_gpd_xlate
+				(const struct of_phandle_args *genpdspec, void *data)
+{
+	struct genpd_onecell_data *genpd_data = data;
+	unsigned int i, idx = genpdspec->args[0];
+	struct zynqmp_pm_domain *pd;
+
+	pd = to_zynqmp_pm_domain(genpd_data->domains[0]);
+
+	if (genpdspec->args_count != 1)
+		return ERR_PTR(-EINVAL);
+
+	/* Check for existing pm domains */
+	for (i = 0; i < ZYNQMP_NUM_DOMAINS; i++) {
+		if (pd[i].node_id == idx)
+			goto done;
+	}
+
+	/*
+	 * Add index in empty node_id of power domain list as no existing
+	 * power domain found for current index.
+	 */
+	for (i = 0; i < ZYNQMP_NUM_DOMAINS; i++) {
+		if (pd[i].node_id == 0) {
+			pd[i].node_id = idx;
+			break;
+		}
+	}
+
+done:
+	if (!genpd_data->domains[i] || i == ZYNQMP_NUM_DOMAINS)
+		return ERR_PTR(-ENOENT);
+
+	return genpd_data->domains[i];
+}
+
+static int zynqmp_gpd_probe(struct platform_device *pdev)
+{
+	int i;
+	struct genpd_onecell_data *zynqmp_pd_data;
+	struct generic_pm_domain **domains;
+	struct zynqmp_pm_domain *pd;
+	struct device *dev = &pdev->dev;
+
+	pd = devm_kcalloc(dev, ZYNQMP_NUM_DOMAINS, sizeof(*pd), GFP_KERNEL);
+	if (!pd)
+		return -ENOMEM;
+
+	zynqmp_pd_data = devm_kzalloc(dev, sizeof(*zynqmp_pd_data), GFP_KERNEL);
+	if (!zynqmp_pd_data)
+		return -ENOMEM;
+
+	zynqmp_pd_data->xlate = zynqmp_gpd_xlate;
+
+	domains = devm_kcalloc(dev, ZYNQMP_NUM_DOMAINS, sizeof(*domains),
+			       GFP_KERNEL);
+	if (!domains)
+		return -ENOMEM;
+
+	if (!of_device_is_compatible(dev->parent->of_node,
+				     "xlnx,zynqmp-firmware"))
+		min_capability = ZYNQMP_PM_CAPABILITY_UNUSABLE;
+
+	for (i = 0; i < ZYNQMP_NUM_DOMAINS; i++, pd++) {
+		pd->node_id = 0;
+		pd->gpd.name = kasprintf(GFP_KERNEL, "domain%d", i);
+		pd->gpd.power_off = zynqmp_gpd_power_off;
+		pd->gpd.power_on = zynqmp_gpd_power_on;
+		pd->gpd.attach_dev = zynqmp_gpd_attach_dev;
+		pd->gpd.detach_dev = zynqmp_gpd_detach_dev;
+
+		domains[i] = &pd->gpd;
+
+		/* Mark all PM domains as initially powered off */
+		pm_genpd_init(&pd->gpd, NULL, true);
+	}
+
+	zynqmp_pd_data->domains = domains;
+	zynqmp_pd_data->num_domains = ZYNQMP_NUM_DOMAINS;
+	of_genpd_add_provider_onecell(dev->parent->of_node, zynqmp_pd_data);
+
+	return 0;
+}
+
+static void zynqmp_gpd_remove(struct platform_device *pdev)
+{
+	of_genpd_del_provider(pdev->dev.parent->of_node);
+}
+
+static struct platform_driver zynqmp_power_domain_driver = {
+	.driver	= {
+		.name = "zynqmp_power_controller",
+	},
+	.probe = zynqmp_gpd_probe,
+	.remove = zynqmp_gpd_remove,
+};
+module_platform_driver(zynqmp_power_domain_driver);
+
+MODULE_ALIAS("platform:zynqmp_power_controller");