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path: root/drivers/i2c/busses/i2c-designware-platdrv.c
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Diffstat (limited to 'drivers/i2c/busses/i2c-designware-platdrv.c')
-rw-r--r--drivers/i2c/busses/i2c-designware-platdrv.c19
1 files changed, 12 insertions, 7 deletions
diff --git a/drivers/i2c/busses/i2c-designware-platdrv.c b/drivers/i2c/busses/i2c-designware-platdrv.c
index 35b70a1edf5..4c5fadabe49 100644
--- a/drivers/i2c/busses/i2c-designware-platdrv.c
+++ b/drivers/i2c/busses/i2c-designware-platdrv.c
@@ -34,6 +34,7 @@
#include <linux/sched.h>
#include <linux/err.h>
#include <linux/interrupt.h>
+#include <linux/of.h>
#include <linux/of_i2c.h>
#include <linux/platform_device.h>
#include <linux/pm.h>
@@ -87,13 +88,6 @@ static int dw_i2c_probe(struct platform_device *pdev)
struct resource *mem;
int irq, r;
- /* NOTE: driver uses the static register mapping */
- mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- if (!mem) {
- dev_err(&pdev->dev, "no mem resource?\n");
- return -EINVAL;
- }
-
irq = platform_get_irq(pdev, 0);
if (irq < 0) {
dev_err(&pdev->dev, "no irq resource?\n");
@@ -104,6 +98,7 @@ static int dw_i2c_probe(struct platform_device *pdev)
if (!dev)
return -ENOMEM;
+ mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
dev->base = devm_ioremap_resource(&pdev->dev, mem);
if (IS_ERR(dev->base))
return PTR_ERR(dev->base);
@@ -121,6 +116,16 @@ static int dw_i2c_probe(struct platform_device *pdev)
return PTR_ERR(dev->clk);
clk_prepare_enable(dev->clk);
+ if (pdev->dev.of_node) {
+ u32 ht = 0;
+ u32 ic_clk = dev->get_clk_rate_khz(dev);
+
+ of_property_read_u32(pdev->dev.of_node,
+ "i2c-sda-hold-time-ns", &ht);
+ dev->sda_hold_time = div_u64((u64)ic_clk * ht + 500000,
+ 1000000);
+ }
+
dev->functionality =
I2C_FUNC_I2C |
I2C_FUNC_10BIT_ADDR |