Merge tag 'armsoc-drivers' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc

Pull ARM SoC-related driver updates from Olof Johansson:
 "Various driver updates for platforms:

   - Nvidia: Fuse support for Tegra194, continued memory controller
     pieces for Tegra30

   - NXP/FSL: Refactorings of QuickEngine drivers to support
     ARM/ARM64/PPC

   - NXP/FSL: i.MX8MP SoC driver pieces

   - TI Keystone: ring accelerator driver

   - Qualcomm: SCM driver cleanup/refactoring + support for new SoCs.

   - Xilinx ZynqMP: feature checking interface for firmware. Mailbox
     communication for power management

   - Overall support patch set for cpuidle on more complex hierarchies
     (PSCI-based)

  and misc cleanups, refactorings of Marvell, TI, other platforms"

* tag 'armsoc-drivers' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc: (166 commits)
  drivers: soc: xilinx: Use mailbox IPI callback
  dt-bindings: power: reset: xilinx: Add bindings for ipi mailbox
  drivers: soc: ti: knav_qmss_queue: Pass lockdep expression to RCU lists
  MAINTAINERS: Add brcmstb PCIe controller entry
  soc/tegra: fuse: Unmap registers once they are not needed anymore
  soc/tegra: fuse: Correct straps' address for older Tegra124 device trees
  soc/tegra: fuse: Warn if straps are not ready
  soc/tegra: fuse: Cache values of straps and Chip ID registers
  memory: tegra30-emc: Correct error message for timed out auto calibration
  memory: tegra30-emc: Firm up hardware programming sequence
  memory: tegra30-emc: Firm up suspend/resume sequence
  soc/tegra: regulators: Do nothing if voltage is unchanged
  memory: tegra: Correct reset value of xusb_hostr
  soc/tegra: fuse: Add APB DMA dependency for Tegra20
  bus: tegra-aconnect: Remove PM_CLK dependency
  dt-bindings: mediatek: add MT6765 power dt-bindings
  soc: mediatek: cmdq: delete not used define
  memory: tegra: Add support for the Tegra194 memory controller
  memory: tegra: Only include support for enabled SoCs
  memory: tegra: Support DVFS on Tegra186 and later
  ...

drivers/firmware/xilinx/zynqmp.c

@@ -26,6 +26,9 @@
 
 static const struct zynqmp_eemi_ops *eemi_ops_tbl;
 
+static bool feature_check_enabled;
+static u32 zynqmp_pm_features[PM_API_MAX];
+
 static const struct mfd_cell firmware_devs[] = {
 	{
 		.name = "zynqmp_power_controller",
@@ -44,6 +47,8 @@ static int zynqmp_pm_ret_code(u32 ret_status)
 	case XST_PM_SUCCESS:
 	case XST_PM_DOUBLE_REQ:
 		return 0;
+	case XST_PM_NO_FEATURE:
+		return -ENOTSUPP;
 	case XST_PM_NO_ACCESS:
 		return -EACCES;
 	case XST_PM_ABORT_SUSPEND:
@@ -128,6 +133,39 @@ static noinline int do_fw_call_hvc(u64 arg0, u64 arg1, u64 arg2,
 	return zynqmp_pm_ret_code((enum pm_ret_status)res.a0);
 }
 
+/**
+ * zynqmp_pm_feature() - Check weather given feature is supported or not
+ * @api_id:		API ID to check
+ *
+ * Return: Returns status, either success or error+reason
+ */
+static int zynqmp_pm_feature(u32 api_id)
+{
+	int ret;
+	u32 ret_payload[PAYLOAD_ARG_CNT];
+	u64 smc_arg[2];
+
+	if (!feature_check_enabled)
+		return 0;
+
+	/* Return value if feature is already checked */
+	if (zynqmp_pm_features[api_id] != PM_FEATURE_UNCHECKED)
+		return zynqmp_pm_features[api_id];
+
+	smc_arg[0] = PM_SIP_SVC | PM_FEATURE_CHECK;
+	smc_arg[1] = api_id;
+
+	ret = do_fw_call(smc_arg[0], smc_arg[1], 0, ret_payload);
+	if (ret) {
+		zynqmp_pm_features[api_id] = PM_FEATURE_INVALID;
+		return PM_FEATURE_INVALID;
+	}
+
+	zynqmp_pm_features[api_id] = ret_payload[1];
+
+	return zynqmp_pm_features[api_id];
+}
+
 /**
  * zynqmp_pm_invoke_fn() - Invoke the system-level platform management layer
  *			   caller function depending on the configuration
@@ -162,6 +200,9 @@ int zynqmp_pm_invoke_fn(u32 pm_api_id, u32 arg0, u32 arg1,
 	 */
 	u64 smc_arg[4];
 
+	if (zynqmp_pm_feature(pm_api_id) == PM_FEATURE_INVALID)
+		return -ENOTSUPP;
+
 	smc_arg[0] = PM_SIP_SVC | pm_api_id;
 	smc_arg[1] = ((u64)arg1 << 32) | arg0;
 	smc_arg[2] = ((u64)arg3 << 32) | arg2;
@@ -717,6 +758,8 @@ static int zynqmp_firmware_probe(struct platform_device *pdev)
 		np = of_find_compatible_node(NULL, NULL, "xlnx,versal");
 		if (!np)
 			return 0;
+
+		feature_check_enabled = true;
 	}
 	of_node_put(np);