lkml.org 
[lkml]   [2017]   [Mar]   [2]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH] i2c: thunderx: ACPI support for clock settings
Date
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>
---
drivers/i2c/busses/i2c-thunderx-pcidrv.c | 24 +++++++++++++++---------
1 file changed, 15 insertions(+), 9 deletions(-)

diff --git a/drivers/i2c/busses/i2c-thunderx-pcidrv.c b/drivers/i2c/busses/i2c-thunderx-pcidrv.c
index bba5b42..031e59f 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;
--
2.9.0.rc0.21.g7777322
\
 
 \ /
  Last update: 2017-03-02 11:45    [W:0.045 / U:0.324 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site