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i2c: rockchip: dynamically control clk

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黄涛
2014-10-28 14:59:58 +08:00
parent da8f8281e9
commit fd4605611e
1 changed files with 11 additions and 5 deletions
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16
drivers/i2c/busses/i2c-rockchip.c
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@@ -330,9 +330,9 @@ static void rockchip_i2c_set_clk(struct rockchip_i2c *i2c, unsigned long scl_rat
static void rockchip_i2c_init_hw(struct rockchip_i2c *i2c, unsigned long scl_rate)
{
i2c->scl_rate = 0;
// clk_prepare_enable(i2c->clk);
clk_enable(i2c->clk);
rockchip_i2c_set_clk(i2c, scl_rate);
// clk_disable_unprepare(i2c->clk);
clk_disable(i2c->clk);
}
/* returns TRUE if we this is the last byte in the current message */
@@ -738,7 +738,7 @@ static int rockchip_i2c_xfer(struct i2c_adapter *adap,
struct rockchip_i2c *i2c = i2c_get_adapdata(adap);
unsigned long scl_rate = i2c->scl_rate;
// clk_prepare_enable(i2c->clk);
clk_enable(i2c->clk);
if (i2c->check_idle) {
int state, retry = 10;
while (retry--) {
@@ -776,7 +776,7 @@ static int rockchip_i2c_xfer(struct i2c_adapter *adap,
ret = rockchip_i2c_doxfer(i2c, msgs, num);
i2c_dbg(i2c->dev, "i2c transfer stop: addr: 0x%04x, state: %d, ret: %d\n", msgs[0].addr, ret, i2c->state);
// clk_disable_unprepare(i2c->clk);
clk_disable(i2c->clk);
return (ret < 0) ? ret : num;
}
@@ -907,7 +907,12 @@ static int rockchip_i2c_probe(struct platform_device *pdev)
return ret;
}
clk_prepare_enable(i2c->clk); // FIXME: enable i2c clock temporarily
ret = clk_prepare(i2c->clk);
if (ret < 0) {
dev_err(&pdev->dev, "Could not prepare clock\n");
return ret;
}
i2c->i2c_rate = clk_get_rate(i2c->clk);
rockchip_i2c_init_hw(i2c, 100 * 1000);
@@ -928,6 +933,7 @@ static int rockchip_i2c_remove(struct platform_device *pdev)
struct rockchip_i2c *i2c = platform_get_drvdata(pdev);
i2c_del_adapter(&i2c->adap);
clk_unprepare(i2c->clk);
return 0;
}