@@ -6,6 +6,11 @@ Required properties :
- reg : Offset and length of the register set for the device
- interrupts : <IRQ> where IRQ is the interrupt number.
+Optional properties:
+
+ - rx-fifo-size : 1 cell, Rx fifo threshold
+ - tx-fifo-size : 1 cell, Tx fifo threshold
+
Recommended properties :
- clock-frequency : desired I2C bus clock frequency in Hz.
@@ -18,5 +23,7 @@ Example :
compatible = "snps,designware-i2c";
reg = <0xf0000 0x1000>;
interrupts = <11>;
+ rx-fifo-size = <16>;
+ tx-fifo-size = <16>;
clock-frequency = <400000>;
};
@@ -85,6 +85,7 @@ static int dw_i2c_probe(struct platform_device *pdev)
struct dw_i2c_dev *dev;
struct i2c_adapter *adap;
struct resource *mem;
+ struct device_node *np = pdev->dev.of_node;
int irq, r;
/* NOTE: driver uses the static register mapping */
@@ -140,6 +141,8 @@ static int dw_i2c_probe(struct platform_device *pdev)
dev->rx_fifo_depth = ((param1 >> 8) & 0xff) + 1;
dev->adapter.nr = pdev->id;
}
+ of_property_read_u32(np, "rx-fifo-size", &dev->rx_fifo_depth);
+ of_property_read_u32(np, "tx-fifo-size", &dev->tx_fifo_depth);
r = i2c_dw_init(dev);
if (r)
return r;
rx-fifo-size and tx-fifo-size will be updated if provided from dts Signed-off-by: Zhangfei Gao <zhangfei.gao@linaro.org> CC: Baruch Siach <baruch@tkos.co.il> --- .../devicetree/bindings/i2c/i2c-designware.txt | 7 +++++++ drivers/i2c/busses/i2c-designware-platdrv.c | 3 +++ 2 files changed, 10 insertions(+)