diff options
| author |   Jan Glauber <jglauber@cavium.com> | 2017-03-02 11:34:07 +0100 |
|---|---|---|
| committer |   Wolfram Sang <wsa@the-dreams.de> | 2017-03-23 21:49:27 +0100 |
| commit | 346e400cfcebeb2a3dc3ede80cbd8b6fb95165ce (patch) | |
| tree | 4678ca8437ec5069a7d4079d4a5f6f3657dd8c9d /drivers/i2c | |
| parent | i2c: xlp9xx: update for ARCH_THUNDER2 (diff) | |
| download | linux-dev-346e400cfcebeb2a3dc3ede80cbd8b6fb95165ce.tar.xz linux-dev-346e400cfcebeb2a3dc3ede80cbd8b6fb95165ce.zip | |
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>
Diffstat (limited to 'drivers/i2c')
| -rw-r--r-- | drivers/i2c/busses/i2c-thunderx-pcidrv.c | 24 |
1 files changed, 15 insertions, 9 deletions
diff --git a/drivers/i2c/busses/i2c-thunderx-pcidrv.c b/drivers/i2c/busses/i2c-thunderx-pcidrv.c index 1d4c2beacf2e..b4bc884cef93 100644 --- a/drivers/i2c/busses/i2c-thunderx-pcidrv.c +++ b/drivers/i2c/busses/i2c-thunderx-pcidrv.c @@ -85,17 +85,23 @@ 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); + } else { + /* ACPI */ + device_property_read_u32(dev, "sclk", &i2c->sys_freq); } - ret = clk_prepare_enable(i2c->clk); - if (ret) - goto skip; - i2c->sys_freq = clk_get_rate(i2c->clk); - skip: if (!i2c->sys_freq) i2c->sys_freq = SYS_FREQ_DEFAULT; |