linux-kernel - [Patch v2 1/3] misc: pch_phub: Read prefetch value from device tree if passed

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Date:	Fri, 12 Aug 2016 12:48:52 +0100
From:	Zubair Lutfullah Kakakhel <Zubair.Kakakhel@...tec.com>
To:	<gregkh@...uxfoundation.org>, <arnd@...db.de>
CC:	<jslaby@...e.com>, <linux-kernel@...r.kernel.org>,
	<linux-serial@...r.kernel.org>, <Zubair.Kakakhel@...tec.com>
Subject: [Patch v2 1/3] misc: pch_phub: Read prefetch value from device tree if passed

The default prefetch value for the eg20t device is hard coded to
0x000affaa.

Add support for an alternative to be read from DT if available

Signed-off-by: Zubair Lutfullah Kakakhel <Zubair.Kakakhel@...tec.com>

---
V1 -> V2
added #include <linux/of.h>
---
 drivers/misc/pch_phub.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/misc/pch_phub.c b/drivers/misc/pch_phub.c
index 4810e03..1dd18f5 100644
--- a/drivers/misc/pch_phub.c
+++ b/drivers/misc/pch_phub.c
@@ -28,6 +28,7 @@
 #include <linux/if_ether.h>
 #include <linux/ctype.h>
 #include <linux/dmi.h>
+#include <linux/of.h>
 
 #define PHUB_STATUS 0x00		/* Status Register offset */
 #define PHUB_CONTROL 0x04		/* Control Register offset */
@@ -711,6 +712,12 @@ static int pch_phub_probe(struct pci_dev *pdev,
 
 	if (id->driver_data == 1) { /* EG20T PCH */
 		const char *board_name;
+		unsigned int prefetch = 0x000affaa;
+
+		if (pdev->dev.of_node)
+			of_property_read_u32(pdev->dev.of_node,
+						  "intel,eg20t-prefetch",
+						  &prefetch);
 
 		ret = sysfs_create_file(&pdev->dev.kobj,
 					&dev_attr_pch_mac.attr);
@@ -736,7 +743,7 @@ static int pch_phub_probe(struct pci_dev *pdev,
 						CLKCFG_UART_MASK);
 
 		/* set the prefech value */
-		iowrite32(0x000affaa, chip->pch_phub_base_address + 0x14);
+		iowrite32(prefetch, chip->pch_phub_base_address + 0x14);
 		/* set the interrupt delay value */
 		iowrite32(0x25, chip->pch_phub_base_address + 0x44);
 		chip->pch_opt_rom_start_address = PCH_PHUB_ROM_START_ADDR_EG20T;
-- 
1.9.1