linux-kernel - [PATCH 2/2] reset: reset-zynqmp: Added support for Versal platform

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Message-Id: <1594708149-29944-3-git-send-email-lakshmi.sai.krishna.potthuri@xilinx.com>
Date:   Tue, 14 Jul 2020 11:59:09 +0530
From:   Sai Krishna Potthuri <lakshmi.sai.krishna.potthuri@...inx.com>
To:     Philipp Zabel <p.zabel@...gutronix.de>,
        Rob Herring <robh+dt@...nel.org>,
        Michal Simek <michal.simek@...inx.com>
Cc:     devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, git@...inx.com,
        saikrishna12468@...il.com,
        Sai Krishna Potthuri <lakshmi.sai.krishna.potthuri@...inx.com>
Subject: [PATCH 2/2] reset: reset-zynqmp: Added support for Versal platform

Updated the reset driver to support Versal platform.
As part of adding Versal support
- Added Versal specific compatible string.
- Reset Id and number of resets are different for Versal and ZynqMP,
hence taken care of these two based on compatible string.

Signed-off-by: Sai Krishna Potthuri <lakshmi.sai.krishna.potthuri@...inx.com>
---
 drivers/reset/reset-zynqmp.c | 24 ++++++++++++++++++++----
 1 file changed, 20 insertions(+), 4 deletions(-)

diff --git a/drivers/reset/reset-zynqmp.c b/drivers/reset/reset-zynqmp.c
index 373ea8d4f7a1..17aa4532ec5e 100644
--- a/drivers/reset/reset-zynqmp.c
+++ b/drivers/reset/reset-zynqmp.c
@@ -12,9 +12,11 @@
 
 #define ZYNQMP_NR_RESETS (ZYNQMP_PM_RESET_END - ZYNQMP_PM_RESET_START)
 #define ZYNQMP_RESET_ID ZYNQMP_PM_RESET_START
+#define VERSAL_NR_RESETS	95
 
 struct zynqmp_reset_data {
 	struct reset_controller_dev rcdev;
+	u32 reset_id;
 };
 
 static inline struct zynqmp_reset_data *
@@ -26,23 +28,28 @@ to_zynqmp_reset_data(struct reset_controller_dev *rcdev)
 static int zynqmp_reset_assert(struct reset_controller_dev *rcdev,
 			       unsigned long id)
 {
-	return zynqmp_pm_reset_assert(ZYNQMP_RESET_ID + id,
+	struct zynqmp_reset_data *priv = to_zynqmp_reset_data(rcdev);
+
+	return zynqmp_pm_reset_assert(priv->reset_id + id,
 				      PM_RESET_ACTION_ASSERT);
 }
 
 static int zynqmp_reset_deassert(struct reset_controller_dev *rcdev,
 				 unsigned long id)
 {
-	return zynqmp_pm_reset_assert(ZYNQMP_RESET_ID + id,
+	struct zynqmp_reset_data *priv = to_zynqmp_reset_data(rcdev);
+
+	return zynqmp_pm_reset_assert(priv->reset_id + id,
 				      PM_RESET_ACTION_RELEASE);
 }
 
 static int zynqmp_reset_status(struct reset_controller_dev *rcdev,
 			       unsigned long id)
 {
+	struct zynqmp_reset_data *priv = to_zynqmp_reset_data(rcdev);
 	int val, err;
 
-	err = zynqmp_pm_reset_get_status(ZYNQMP_RESET_ID + id, &val);
+	err = zynqmp_pm_reset_get_status(priv->reset_id + id, &val);
 	if (err)
 		return err;
 
@@ -52,7 +59,9 @@ static int zynqmp_reset_status(struct reset_controller_dev *rcdev,
 static int zynqmp_reset_reset(struct reset_controller_dev *rcdev,
 			      unsigned long id)
 {
-	return zynqmp_pm_reset_assert(ZYNQMP_RESET_ID + id,
+	struct zynqmp_reset_data *priv = to_zynqmp_reset_data(rcdev);
+
+	return zynqmp_pm_reset_assert(priv->reset_id + id,
 				      PM_RESET_ACTION_PULSE);
 }
 
@@ -76,13 +85,20 @@ static int zynqmp_reset_probe(struct platform_device *pdev)
 	priv->rcdev.ops = &zynqmp_reset_ops;
 	priv->rcdev.owner = THIS_MODULE;
 	priv->rcdev.of_node = pdev->dev.of_node;
+	priv->reset_id = ZYNQMP_RESET_ID;
 	priv->rcdev.nr_resets = ZYNQMP_NR_RESETS;
+	if (of_device_is_compatible(pdev->dev.of_node,
+				    "xlnx,versal-reset")) {
+		priv->reset_id = 0;
+		priv->rcdev.nr_resets = VERSAL_NR_RESETS;
+	}
 
 	return devm_reset_controller_register(&pdev->dev, &priv->rcdev);
 }
 
 static const struct of_device_id zynqmp_reset_dt_ids[] = {
 	{ .compatible = "xlnx,zynqmp-reset", },
+	{ .compatible = "xlnx,versal-reset", },
 	{ /* sentinel */ },
 };
 
-- 
2.17.1