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authorGanesan Ramalingam <ganesanr@broadcom.com>2012-07-13 19:14:23 +0530
committerWolfram Sang <w.sang@pengutronix.de>2012-07-14 13:30:24 +0200
commit8bb986a816148d6e8fbaae23be0fee33d6a1ae3f (patch)
tree1b1bee995a60cc6be9d87ce9bbe711b26746cedf /drivers/i2c
parent9ae97a8996a6d6f66e2fbc221906e2406d6c261f (diff)
downloadop-kernel-dev-8bb986a816148d6e8fbaae23be0fee33d6a1ae3f.zip
op-kernel-dev-8bb986a816148d6e8fbaae23be0fee33d6a1ae3f.tar.gz
i2c: i2c-ocores: Use reg-shift property
Deprecate 'regstep' property and use the standard 'reg-shift' property for register offset shifts. 'regstep' will still be supported as an optional property, but will give a warning when used. Signed-off-by: Ganesan Ramalingam <ganesanr@broadcom.com> Signed-off-by: Jayachandran C <jayachandranc@netlogicmicro.com> Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
Diffstat (limited to 'drivers/i2c')
-rw-r--r--drivers/i2c/busses/i2c-ocores.c36
1 files changed, 22 insertions, 14 deletions
diff --git a/drivers/i2c/busses/i2c-ocores.c b/drivers/i2c/busses/i2c-ocores.c
index f6e7ad9..9e0709d 100644
--- a/drivers/i2c/busses/i2c-ocores.c
+++ b/drivers/i2c/busses/i2c-ocores.c
@@ -25,10 +25,11 @@
#include <linux/slab.h>
#include <linux/io.h>
#include <linux/of_i2c.h>
+#include <linux/log2.h>
struct ocores_i2c {
void __iomem *base;
- int regstep;
+ u32 reg_shift;
wait_queue_head_t wait;
struct i2c_adapter adap;
struct i2c_msg *msg;
@@ -71,12 +72,12 @@ struct ocores_i2c {
static inline void oc_setreg(struct ocores_i2c *i2c, int reg, u8 value)
{
- iowrite8(value, i2c->base + reg * i2c->regstep);
+ iowrite8(value, i2c->base + (reg << i2c->reg_shift));
}
static inline u8 oc_getreg(struct ocores_i2c *i2c, int reg)
{
- return ioread8(i2c->base + reg * i2c->regstep);
+ return ioread8(i2c->base + (reg << i2c->reg_shift));
}
static void ocores_process(struct ocores_i2c *i2c)
@@ -219,22 +220,29 @@ static struct i2c_adapter ocores_adapter = {
static int ocores_i2c_of_probe(struct platform_device *pdev,
struct ocores_i2c *i2c)
{
- const __be32* val;
-
- val = of_get_property(pdev->dev.of_node, "regstep", NULL);
- if (!val) {
- dev_err(&pdev->dev, "Missing required parameter 'regstep'\n");
- return -ENODEV;
+ struct device_node *np = pdev->dev.of_node;
+ u32 val;
+
+ if (of_property_read_u32(np, "reg-shift", &i2c->reg_shift)) {
+ /* no 'reg-shift', check for deprecated 'regstep' */
+ if (!of_property_read_u32(np, "regstep", &val)) {
+ if (!is_power_of_2(val)) {
+ dev_err(&pdev->dev, "invalid regstep %d\n",
+ val);
+ return -EINVAL;
+ }
+ i2c->reg_shift = ilog2(val);
+ dev_warn(&pdev->dev,
+ "regstep property deprecated, use reg-shift\n");
+ }
}
- i2c->regstep = be32_to_cpup(val);
- val = of_get_property(pdev->dev.of_node, "clock-frequency", NULL);
- if (!val) {
+ if (of_property_read_u32(np, "clock-frequency", &val)) {
dev_err(&pdev->dev,
"Missing required parameter 'clock-frequency'\n");
return -ENODEV;
}
- i2c->clock_khz = be32_to_cpup(val) / 1000;
+ i2c->clock_khz = val / 1000;
return 0;
}
@@ -277,7 +285,7 @@ static int __devinit ocores_i2c_probe(struct platform_device *pdev)
pdata = pdev->dev.platform_data;
if (pdata) {
- i2c->regstep = pdata->regstep;
+ i2c->reg_shift = pdata->reg_shift;
i2c->clock_khz = pdata->clock_khz;
} else {
ret = ocores_i2c_of_probe(pdev, i2c);
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