[PATCH i2c-next v3 2/3] i2c: aspeed: Add 'aspeed,timeout' DT property reading code

[Jae Hyun Yoo]

This commit adds reading code of the 'aspeed,timeout' DT property
to set 'timeout' value in adapter configuration. This value still
case be configured through an I2C_TIMEOUT ioctl on cdev too.

Signed-off-by: Jae Hyun Yoo <jae.hyun....@linux.intel.com>
---
 drivers/i2c/busses/i2c-aspeed.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/drivers/i2c/busses/i2c-aspeed.c b/drivers/i2c/busses/i2c-aspeed.c
index 8dc9161ced38..0d934ce0c028 100644
--- a/drivers/i2c/busses/i2c-aspeed.c
+++ b/drivers/i2c/busses/i2c-aspeed.c
@@ -115,6 +115,9 @@
 /* 0x18 : I2CD Slave Device Address Register   */
 #define ASPEED_I2CD_DEV_ADDR_MASK                      GENMASK(6, 0)
 
+/* Timeout */
+#define ASPEED_I2C_BUS_TIMEOUT_US_DEFAULT              (5 * 1000 * 1000)
+
 enum aspeed_i2c_master_state {
        ASPEED_I2C_MASTER_INACTIVE,
        ASPEED_I2C_MASTER_START,
@@ -885,6 +888,7 @@ static int aspeed_i2c_probe_bus(struct platform_device 
*pdev)
        struct clk *parent_clk;
        struct resource *res;
        int irq, ret;
+       u32 timeout_us;
 
        bus = devm_kzalloc(&pdev->dev, sizeof(*bus), GFP_KERNEL);
        if (!bus)
@@ -918,6 +922,11 @@ static int aspeed_i2c_probe_bus(struct platform_device 
*pdev)
                bus->bus_frequency = 100000;
        }
 
+       ret = of_property_read_u32(pdev->dev.of_node, "aspeed,timeout",
+                                  &timeout_us);
+       if (ret)
+               timeout_us = ASPEED_I2C_BUS_TIMEOUT_US_DEFAULT;
+
        match = of_match_node(aspeed_i2c_bus_of_table, pdev->dev.of_node);
        if (!match)
                bus->get_clk_reg_val = aspeed_i2c_24xx_get_clk_reg_val;
@@ -930,7 +939,7 @@ static int aspeed_i2c_probe_bus(struct platform_device 
*pdev)
        init_completion(&bus->cmd_complete);
        bus->adap.owner = THIS_MODULE;
        bus->adap.retries = 0;
-       bus->adap.timeout = 5 * HZ;
+       bus->adap.timeout = usecs_to_jiffies(timeout_us);
        bus->adap.algo = &aspeed_i2c_algo;
        bus->adap.dev.parent = &pdev->dev;
        bus->adap.dev.of_node = pdev->dev.of_node;
-- 
2.19.0