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rockchip: clk: Add a function to get a peripheral clock rate

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It is useful to be able to read the rate of a peripheral clock. Add a
handler for that.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass 2016-01-21 19:43:40 -07:00
parent 542635a0cf
commit 4f43673e5a
1 changed files with 37 additions and 0 deletions
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37
drivers/clk/clk_rk3288.c
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@ -508,6 +508,42 @@ static ulong rockchip_spi_set_clk(struct rk3288_cru *cru, uint gclk_rate,
return rockchip_spi_get_clk(cru, gclk_rate, periph);
}
static ulong rk3288_get_periph_rate(struct udevice *dev, int periph)
{
struct rk3288_clk_priv *priv = dev_get_priv(dev);
struct udevice *gclk;
ulong new_rate, gclk_rate;
int ret;
ret = uclass_get_device(UCLASS_CLK, CLK_GENERAL, &gclk);
if (ret)
return ret;
gclk_rate = clk_get_rate(gclk);
switch (periph) {
case HCLK_EMMC:
case HCLK_SDIO0:
case HCLK_SDIO1:
new_rate = rockchip_mmc_get_clk(priv->cru, gclk_rate, periph);
break;
case SCLK_SPI0:
case SCLK_SPI1:
case SCLK_SPI2:
new_rate = rockchip_spi_get_clk(priv->cru, gclk_rate, periph);
break;
case PCLK_I2C0:
case PCLK_I2C1:
case PCLK_I2C2:
case PCLK_I2C3:
case PCLK_I2C4:
case PCLK_I2C5:
return gclk_rate;
default:
return -ENOENT;
}
return new_rate;
}
static ulong rk3288_set_periph_rate(struct udevice *dev, int periph, ulong rate)
{
struct rk3288_clk_priv *priv = dev_get_priv(dev);
@ -543,6 +579,7 @@ static struct clk_ops rk3288_clk_ops = {
.get_rate = rk3288_clk_get_rate,
.set_rate = rk3288_clk_set_rate,
.set_periph_rate = rk3288_set_periph_rate,
.get_periph_rate = rk3288_get_periph_rate,
};
static int rk3288_clk_probe(struct udevice *dev)