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i2c: rcar: switch to i2c generic dt parsing 

Switch to the new generic functions. Plain convert, no functionality
added yet.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
Wolfram Sang 2015-12-08 10:37:48 +01:00 committed by Wolfram Sang
parent f9c9d31bdd
commit c7881871de
1 changed files with 9 additions and 7 deletions
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16
drivers/i2c/busses/i2c-rcar.c
View File

@ -162,12 +162,15 @@ static int rcar_i2c_bus_barrier(struct rcar_i2c_priv *priv)
return -EBUSY;
}
static int rcar_i2c_clock_calculate(struct rcar_i2c_priv *priv, u32 bus_speed)
static int rcar_i2c_clock_calculate(struct rcar_i2c_priv *priv, struct i2c_timings *t)
{
u32 scgd, cdf, round, ick, scl, cdf_width;
unsigned long rate;
struct device *dev = rcar_i2c_priv_to_dev(priv);
/* Fall back to previously used values if not supplied */
t->bus_freq_hz = t->bus_freq_hz ?: 100000;
switch (priv->devtype) {
case I2C_RCAR_GEN1:
cdf_width = 2;
@ -230,7 +233,7 @@ static int rcar_i2c_clock_calculate(struct rcar_i2c_priv *priv, u32 bus_speed)
*/
for (scgd = 0; scgd < 0x40; scgd++) {
scl = ick / (20 + (scgd * 8) + round);
if (scl <= bus_speed)
if (scl <= t->bus_freq_hz)
goto scgd_find;
}
dev_err(dev, "it is impossible to calculate best SCL\n");
@ -238,7 +241,7 @@ static int rcar_i2c_clock_calculate(struct rcar_i2c_priv *priv, u32 bus_speed)
scgd_find:
dev_dbg(dev, "clk %d/%d(%lu), round %u, CDF:0x%x, SCGD: 0x%x\n",
scl, bus_speed, clk_get_rate(priv->clk), round, cdf, scgd);
scl, t->bus_freq_hz, clk_get_rate(priv->clk), round, cdf, scgd);
/* keep icccr value */
priv->icccr = scgd << cdf_width | cdf;
@ -588,7 +591,7 @@ static int rcar_i2c_probe(struct platform_device *pdev)
struct i2c_adapter *adap;
struct resource *res;
struct device *dev = &pdev->dev;
u32 bus_speed;
struct i2c_timings i2c_t;
int irq, ret;
priv = devm_kzalloc(dev, sizeof(struct rcar_i2c_priv), GFP_KERNEL);
@ -619,12 +622,11 @@ static int rcar_i2c_probe(struct platform_device *pdev)
i2c_set_adapdata(adap, priv);
strlcpy(adap->name, pdev->name, sizeof(adap->name));
bus_speed = 100000; /* default 100 kHz */
of_property_read_u32(dev->of_node, "clock-frequency", &bus_speed);
i2c_parse_fw_timings(dev, &i2c_t, false);
pm_runtime_enable(dev);
pm_runtime_get_sync(dev);
ret = rcar_i2c_clock_calculate(priv, bus_speed);
ret = rcar_i2c_clock_calculate(priv, &i2c_t);
if (ret < 0)
goto out_pm_put;