[RFC][PATCH v3 07/16] soc: qcom: smem: Add minidump device

[Eugen Hristev <eugen.hristev@linaro.org>]

Add a minidump platform device.
Minidump can collect various memory snippets using dedicated firmware.
To know which snippets to collect, each snippet must be registered
by the kernel into a specific shared memory table which is controlled
by the qcom smem driver.
To instantiate the minidump platform driver, register its data using
platform_device_register_data.
Later on, the minidump driver will probe and register itself into
kmemdump as a backend.

Signed-off-by: Eugen Hristev <eugen.hristev@linaro.org>
---
 drivers/soc/qcom/smem.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/soc/qcom/smem.c b/drivers/soc/qcom/smem.c
index c4c45f15dca4..03315722d71a 100644
--- a/drivers/soc/qcom/smem.c
+++ b/drivers/soc/qcom/smem.c
@@ -270,6 +270,7 @@ struct smem_region {
  * @partitions: list of partitions of current processor/host
  * @item_count: max accepted item number
  * @socinfo:	platform device pointer
+ * @mdinfo:	minidump device pointer
  * @num_regions: number of @regions
  * @regions:	list of the memory regions defining the shared memory
  */
@@ -280,6 +281,7 @@ struct qcom_smem {
 
 	u32 item_count;
 	struct platform_device *socinfo;
+	struct platform_device *mdinfo;
 	struct smem_ptable *ptable;
 	struct smem_partition global_partition;
 	struct smem_partition partitions[SMEM_HOST_COUNT];
@@ -1236,12 +1238,20 @@ static int qcom_smem_probe(struct platform_device *pdev)
 	if (IS_ERR(smem->socinfo))
 		dev_dbg(&pdev->dev, "failed to register socinfo device\n");
 
+	smem->mdinfo = platform_device_register_data(&pdev->dev, "qcom-minidump",
+						     PLATFORM_DEVID_AUTO, NULL,
+						     0);
+	if (IS_ERR(smem->mdinfo))
+		dev_err(&pdev->dev, "failed to register platform md device\n");
+
 	return 0;
 }
 
 static void qcom_smem_remove(struct platform_device *pdev)
 {
 	platform_device_unregister(__smem->socinfo);
+	if (!IS_ERR(__smem->mdinfo))
+		platform_device_unregister(__smem->mdinfo);
 
 	hwspin_lock_free(__smem->hwlock);
 	__smem = NULL;
-- 
2.43.0