[PATCH 2/8] media: imx-pxp: detect PXP version

[Michael Tretter]

Different versions of the Pixel Pipeline have different blocks and their
routing may be different. Read the PXP_HW_VERSION register to determine
the version of the PXP and print it to the log for debugging purposes.

Signed-off-by: Michael Tretter <m.tretter at pengutronix.de>
---
 drivers/media/platform/nxp/imx-pxp.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/drivers/media/platform/nxp/imx-pxp.c b/drivers/media/platform/nxp/imx-pxp.c
index 689ae5e6ac62..05abe40558b0 100644
--- a/drivers/media/platform/nxp/imx-pxp.c
+++ b/drivers/media/platform/nxp/imx-pxp.c
@@ -10,6 +10,7 @@
  * Pawel Osciak, <pawel at osciak.com>
  * Marek Szyprowski, <m.szyprowski at samsung.com>
  */
+#include <linux/bitfield.h>
 #include <linux/clk.h>
 #include <linux/delay.h>
 #include <linux/dma-mapping.h>
@@ -52,6 +53,11 @@ MODULE_PARM_DESC(debug, "activates debug info");
 #define MEM2MEM_HFLIP	(1 << 0)
 #define MEM2MEM_VFLIP	(1 << 1)
 
+#define PXP_VERSION_MAJOR(version) \
+	FIELD_GET(BM_PXP_VERSION_MAJOR, version)
+#define PXP_VERSION_MINOR(version) \
+	FIELD_GET(BM_PXP_VERSION_MINOR, version)
+
 #define dprintk(dev, fmt, arg...) \
 	v4l2_dbg(1, debug, &dev->v4l2_dev, "%s: " fmt, __func__, ## arg)
 
@@ -192,6 +198,8 @@ struct pxp_dev {
 	struct clk		*clk;
 	void __iomem		*mmio;
 
+	u32			hw_version;
+
 	atomic_t		num_inst;
 	struct mutex		dev_mutex;
 	spinlock_t		irqlock;
@@ -1660,6 +1668,11 @@ static int pxp_soft_reset(struct pxp_dev *dev)
 	return 0;
 }
 
+static u32 pxp_read_version(struct pxp_dev *dev)
+{
+	return readl(dev->mmio + HW_PXP_VERSION);
+}
+
 static int pxp_probe(struct platform_device *pdev)
 {
 	struct pxp_dev *dev;
@@ -1705,6 +1718,11 @@ static int pxp_probe(struct platform_device *pdev)
 		goto err_clk;
 	}
 
+	dev->hw_version = pxp_read_version(dev);
+	dev_info(&pdev->dev, "PXP Version %d.%d\n",
+		 PXP_VERSION_MAJOR(dev->hw_version),
+		 PXP_VERSION_MINOR(dev->hw_version));
+
 	ret = v4l2_device_register(&pdev->dev, &dev->v4l2_dev);
 	if (ret)
 		goto err_clk;
-- 
2.30.2