-----Original Message-----
From: Stefano Stabellini <redacted>
Sent: Thursday, August 13, 2020 1:36 PM
To: Ben Levinsky <redacted>
Cc: Stefano Stabellini <redacted>; Michal Simek
[off-list ref]; devicetree@vger.kernel.org;
mathieu.poirier@linaro.org; Ed T. Mooring [off-list ref]; linux-
remoteproc@vger.kernel.org; linux-kernel@vger.kernel.org;
robh+dt@kernel.org; Jiaying Liang [off-list ref]; linux-arm-
kernel@lists.infradead.org
Subject: Re: [PATCH v8 2/5] firmware: xilinx: Add shutdown/wakeup APIs

On Mon, 10 Aug 2020, Ben Levinsky wrote:

quoted

Add shutdown/wakeup a resource eemi operations to shutdown
or bringup a resource.

Signed-off-by: Ben Levinsky <redacted>
---
v3:
- add xilinx-related platform mgmt fn's instead of wrapping around
  function pointer in xilinx eemi ops struct
- fix formatting
v4:
- add default values for enumv3:
- add xilinx-related platform mgmt fn's instead of wrapping around
  function pointer in xilinx eemi ops struct
- fix formatting
v4:
- add default values for enum
---
 drivers/firmware/xilinx/zynqmp.c     | 35 ++++++++++++++++++++++++++++
 include/linux/firmware/xlnx-zynqmp.h | 22 +++++++++++++++++
 2 files changed, 57 insertions(+)

diff --git a/drivers/firmware/xilinx/zynqmp.c

b/drivers/firmware/xilinx/zynqmp.c

quoted

index 8d1ff2454e2e..f1a0bd35deeb 100644

--- a/drivers/firmware/xilinx/zynqmp.c
+++ b/drivers/firmware/xilinx/zynqmp.c

@@ -846,6 +846,41 @@ int zynqmp_pm_release_node(const u32 node)
 }
 EXPORT_SYMBOL_GPL(zynqmp_pm_release_node);

+/**
+ * zynqmp_pm_force_powerdown - PM call to request for another PU or

subsystem to

quoted

+ *             be powered down forcefully
+ * @target:    Node ID of the targeted PU or subsystem
+ * @ack:   Flag to specify whether acknowledge is requested
+ *
+ * Return: status, either success or error+reason
+ */
+int zynqmp_pm_force_powerdown(const u32 target,

If the target is really the node id, why not calling it "node", the same
way as below?

[Ben Levinsky] good point. Will change to "target" in v9

quoted

+			      const enum zynqmp_pm_request_ack ack)
+{
+	return zynqmp_pm_invoke_fn(PM_FORCE_POWERDOWN, target, ack,

0, 0, NULL);

quoted

+}
+EXPORT_SYMBOL_GPL(zynqmp_pm_force_powerdown);
+
+/**
+ * zynqmp_pm_request_wakeup - PM call to wake up selected master or

subsystem

quoted

+ * @node:  Node ID of the master or subsystem
+ * @set_addr:  Specifies whether the address argument is relevant
+ * @address:   Address from which to resume when woken up
+ * @ack:   Flag to specify whether acknowledge requested
+ *
+ * Return: status, either success or error+reason
+ */
+int zynqmp_pm_request_wakeup(const u32 node,
+			     const bool set_addr,
+			     const u64 address,
+			     const enum zynqmp_pm_request_ack ack)
+{
+	/* set_addr flag is encoded into 1st bit of address */
+	return zynqmp_pm_invoke_fn(PM_REQUEST_WAKEUP, node, address

| set_addr,

quoted

+				   address >> 32, ack, NULL);
+}
+EXPORT_SYMBOL_GPL(zynqmp_pm_request_wakeup);
+
 /**
  * zynqmp_pm_set_requirement() - PM call to set requirement for PM

slaves

quoted

  * @node:		Node ID of the slave

diff --git a/include/linux/firmware/xlnx-zynqmp.h

b/include/linux/firmware/xlnx-zynqmp.h

quoted

index bb347dfe4ba4..4d83a7d69c4c 100644

--- a/include/linux/firmware/xlnx-zynqmp.h
+++ b/include/linux/firmware/xlnx-zynqmp.h

@@ -64,6 +64,8 @@

 enum pm_api_id {
 	PM_GET_API_VERSION = 1,
+	PM_FORCE_POWERDOWN = 8,
+	PM_REQUEST_WAKEUP = 10,
 	PM_SYSTEM_SHUTDOWN = 12,
 	PM_REQUEST_NODE = 13,
 	PM_RELEASE_NODE,

@@ -376,6 +378,12 @@ int zynqmp_pm_write_pggs(u32 index, u32 value);
 int zynqmp_pm_read_pggs(u32 index, u32 *value);
 int zynqmp_pm_system_shutdown(const u32 type, const u32 subtype);
 int zynqmp_pm_set_boot_health_status(u32 value);
+int zynqmp_pm_force_powerdown(const u32 target,
+			      const enum zynqmp_pm_request_ack ack);
+int zynqmp_pm_request_wakeup(const u32 node,
+			     const bool set_addr,
+			     const u64 address,
+			     const enum zynqmp_pm_request_ack ack);
 #else
 static inline struct zynqmp_eemi_ops *zynqmp_pm_get_eemi_ops(void)
 {

@@ -526,6 +534,20 @@ static inline int

zynqmp_pm_set_boot_health_status(u32 value)

quoted

 {
 	return -ENODEV;
 }
+
+static inline int zynqmp_pm_force_powerdown(const u32 target,
+				    const enum zynqmp_pm_request_ack ack)
+{
+	return -ENODEV;
+}
+
+static inline int zynqmp_pm_request_wakeup(const u32 node,
+					   const bool set_addr,
+					   const u64 address,
+				   const enum zynqmp_pm_request_ack ack)

code style

[Ben Levinsky] will fix this in v9

quoted

+{
+	return -ENODEV;
+}
 #endif

 #endif /* __FIRMWARE_ZYNQMP_H__ */
--
2.17.1


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