i2c: thunderx: Adding ioclk support

Read the ioclk property as reference clock if sclk not present in acpi
table to make it SOC agnostic.
In case, it's not populated from dts/acpi table, use the default clock
of 800 MHz which is optimal in either case of sclk/ioclk.

Signed-off-by: Piyush Malgujar <pmalgujar@marvell.com>
Acked-by: Andi Shyti <andi.shyti@kernel.org>
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>

diff --git a/drivers/i2c/busses/i2c-thunderx-pcidrv.c b/drivers/i2c/busses/i2c-thunderx-pcidrv.c
index 31f11b77ab663626967c86086a03213876bf4a07..32d0e3930b675484138084e1bbed2e7cf898e1e1 100644 (file)
--- a/drivers/i2c/busses/i2c-thunderx-pcidrv.c
+++ b/drivers/i2c/busses/i2c-thunderx-pcidrv.c
@@ -27,7 +27,7 @@
 
 #define PCI_DEVICE_ID_THUNDER_TWSI     0xa012
 
-#define SYS_FREQ_DEFAULT               700000000
+#define SYS_FREQ_DEFAULT               800000000
 #define OTX2_REF_FREQ_DEFAULT          100000000
 
 #define TWSI_INT_ENA_W1C               0x1028
@@ -100,7 +100,8 @@ static void thunder_i2c_clock_enable(struct device *dev, struct octeon_i2c *i2c)
                i2c->sys_freq = clk_get_rate(i2c->clk);
        } else {
                /* ACPI */
-               device_property_read_u32(dev, "sclk", &i2c->sys_freq);
+               if (device_property_read_u32(dev, "sclk", &i2c->sys_freq))
+                       device_property_read_u32(dev, "ioclk", &i2c->sys_freq);
        }
 
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