firmware: smci: sandbox test for SCMI reset controllers

Add tests for SCMI reset controllers. A test device driver
sandbox-scmi_devices.c is used to get reset resources, allowing further
resets manipulation.

Change sandbox-smci_agent to emulate 1 reset controller exposed through
an agent. Add DM test scmi_resets to test this reset controller.

Signed-off-by: Etienne Carriere <etienne.carriere@linaro.org>
Cc: Simon Glass <sjg@chromium.org>
Cc: Peng Fan <peng.fan@nxp.com>
Cc: Sudeep Holla <sudeep.holla@arm.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

1 files changed, 39 insertions, 1 deletions

diff --git a/drivers/firmware/scmi/sandbox-scmi_devices.c b/drivers/firmware/scmi/sandbox-scmi_devices.c
index b3e411c5ac..c69967bf69 100644
--- a/drivers/firmware/scmi/sandbox-scmi_devices.c
+++ b/drivers/firmware/scmi/sandbox-scmi_devices.c
@@ -7,6 +7,7 @@
 #include <clk.h>
 #include <dm.h>
 #include <malloc.h>
+#include <reset.h>
 #include <asm/io.h>
 #include <asm/scmi_test.h>
 #include <dm/device_compat.h>
@@ -14,18 +15,22 @@
 /*
  * Simulate to some extent a SCMI exchange.
  * This drivers gets SCMI resources and offers API function to the
- * SCMI test sequence manipulate the resources, currently clocks.
+ * SCMI test sequence manipulate the resources, currently clock
+ * and reset controllers.
  */
 
 #define SCMI_TEST_DEVICES_CLK_COUNT		3
+#define SCMI_TEST_DEVICES_RD_COUNT		1
 
 /*
  * struct sandbox_scmi_device_priv - Storage for device handles used by test
  * @clk:		Array of clock instances used by tests
+ * @reset_clt:		Array of the reset controller instances used by tests
  * @devices:		Resources exposed by sandbox_scmi_devices_ctx()
  */
 struct sandbox_scmi_device_priv {
 	struct clk clk[SCMI_TEST_DEVICES_CLK_COUNT];
+	struct reset_ctl reset_ctl[SCMI_TEST_DEVICES_RD_COUNT];
 	struct sandbox_scmi_devices devices;
 };
 
@@ -39,6 +44,22 @@ struct sandbox_scmi_devices *sandbox_scmi_devices_ctx(struct udevice *dev)
 	return NULL;
 }
 
+static int sandbox_scmi_devices_remove(struct udevice *dev)
+{
+	struct sandbox_scmi_devices *devices = sandbox_scmi_devices_ctx(dev);
+	int ret = 0;
+	size_t n;
+
+	for (n = 0; n < SCMI_TEST_DEVICES_RD_COUNT; n++) {
+		int ret2 = reset_free(devices->reset + n);
+
+		if (ret2 && !ret)
+			ret = ret2;
+	}
+
+	return ret;
+}
+
 static int sandbox_scmi_devices_probe(struct udevice *dev)
 {
 	struct sandbox_scmi_device_priv *priv = dev_get_priv(dev);
@@ -48,6 +69,8 @@ static int sandbox_scmi_devices_probe(struct udevice *dev)
 	priv->devices = (struct sandbox_scmi_devices){
 		.clk = priv->clk,
 		.clk_count = SCMI_TEST_DEVICES_CLK_COUNT,
+		.reset = priv->reset_ctl,
+		.reset_count = SCMI_TEST_DEVICES_RD_COUNT,
 	};
 
 	for (n = 0; n < SCMI_TEST_DEVICES_CLK_COUNT; n++) {
@@ -58,7 +81,21 @@ static int sandbox_scmi_devices_probe(struct udevice *dev)
 		}
 	}
 
+	for (n = 0; n < SCMI_TEST_DEVICES_RD_COUNT; n++) {
+		ret = reset_get_by_index(dev, n, priv->devices.reset + n);
+		if (ret) {
+			dev_err(dev, "%s: Failed on reset %zu\n", __func__, n);
+			goto err_reset;
+		}
+	}
+
 	return 0;
+
+err_reset:
+	for (; n > 0; n--)
+		reset_free(priv->devices.reset + n - 1);
+
+	return ret;
 }
 
 static const struct udevice_id sandbox_scmi_devices_ids[] = {
@@ -71,5 +108,6 @@ U_BOOT_DRIVER(sandbox_scmi_devices) = {
 	.id = UCLASS_MISC,
 	.of_match = sandbox_scmi_devices_ids,
 	.priv_auto_alloc_size = sizeof(struct sandbox_scmi_device_priv),
+	.remove = sandbox_scmi_devices_remove,
 	.probe = sandbox_scmi_devices_probe,
 };