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i2c: thunderx: ACPI support for clock settings 

Add support for reading the system clock and the TWSI clock
frequency from ACPI DSDT.

TWSI clock was already covered by using device_property_read().

Signed-off-by: Jan Glauber <jglauber@cavium.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
Jan Glauber 2017-03-02 11:34:07 +01:00 committed by Wolfram Sang
parent 4165bd4b91
commit 346e400cfc
1 changed files with 15 additions and 9 deletions
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24
drivers/i2c/busses/i2c-thunderx-pcidrv.c
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@ -85,16 +85,22 @@ static void thunder_i2c_clock_enable(struct device *dev, struct octeon_i2c *i2c)
{
int ret;
i2c->clk = clk_get(dev, NULL);
if (IS_ERR(i2c->clk)) {
i2c->clk = NULL;
goto skip;
}
if (acpi_disabled) {
/* DT */
i2c->clk = clk_get(dev, NULL);
if (IS_ERR(i2c->clk)) {
i2c->clk = NULL;
goto skip;
}
ret = clk_prepare_enable(i2c->clk);
if (ret)
goto skip;
i2c->sys_freq = clk_get_rate(i2c->clk);
ret = clk_prepare_enable(i2c->clk);
if (ret)
goto skip;
i2c->sys_freq = clk_get_rate(i2c->clk);
} else {
/* ACPI */
device_property_read_u32(dev, "sclk", &i2c->sys_freq);
}
skip:
if (!i2c->sys_freq)