[PATCH 05/35] irqchip/qcom-pdc: Add PDC_VERSION() macro to describe version register fields

[Mukesh Ojha <mukesh.ojha@oss.qualcomm.com>]

The PDC hardware version register encodes major, minor and step fields
in byte-sized fields at bits [23:16], [15:8] and [7:0] respectively.
The existing PDC_VERSION_3_2 constant was a bare magic number (0x30200)
with no indication of this encoding.

Add GENMASK-based field definitions for each sub-field and a
PDC_VERSION(maj, min, step) constructor macro using FIELD_PREP, making
the encoding self-documenting. Replace the magic constant with
PDC_VERSION(3, 2, 0).

Signed-off-by: Mukesh Ojha <mukesh.ojha@oss.qualcomm.com>
---
 drivers/irqchip/qcom-pdc.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/irqchip/qcom-pdc.c b/drivers/irqchip/qcom-pdc.c
index 734576cdce0c..5e1553334103 100644
--- a/drivers/irqchip/qcom-pdc.c
+++ b/drivers/irqchip/qcom-pdc.c
@@ -3,6 +3,7 @@
  * Copyright (c) 2017-2019, The Linux Foundation. All rights reserved.
  */
 
+#include <linux/bitfield.h>
 #include <linux/err.h>
 #include <linux/init.h>
 #include <linux/interrupt.h>
@@ -34,9 +35,16 @@
 #define IRQ_i_CFG_TYPE_MASK	GENMASK(2, 0)
 
 #define PDC_VERSION_REG		0x1000
+#define PDC_VERSION_MAJOR	GENMASK(23, 16)
+#define PDC_VERSION_MINOR	GENMASK(15, 8)
+#define PDC_VERSION_STEP	GENMASK(7, 0)
+#define PDC_VERSION(maj, min, step)	\
+	(FIELD_PREP(PDC_VERSION_MAJOR, (maj)) | \
+	 FIELD_PREP(PDC_VERSION_MINOR, (min)) | \
+	 FIELD_PREP(PDC_VERSION_STEP,  (step)))
 
 /* Notable PDC versions */
-#define PDC_VERSION_3_2		0x30200
+#define PDC_VERSION_3_2		PDC_VERSION(3, 2, 0)
 
 struct pdc_pin_region {
 	u32 pin_base;
-- 
2.53.0