From mboxrd@z Thu Jan 1 00:00:00 1970 From: zhangfei.gao@linaro.org (Zhangfei Gao) Date: Tue, 11 Jun 2013 10:30:20 +0800 Subject: [PATCH 2/2] i2c: designware: add two optional property tx/rx-fifo-size In-Reply-To: <51B687E5.307@linaro.org> References: <51B687E5.307@linaro.org> Message-ID: <1370917820-24176-1-git-send-email-zhangfei.gao@linaro.org> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org rx-fifo-size and tx-fifo-size will be updated if provided from dts Signed-off-by: Zhangfei Gao CC: Baruch Siach --- .../devicetree/bindings/i2c/i2c-designware.txt | 7 +++++++ drivers/i2c/busses/i2c-designware-platdrv.c | 3 +++ 2 files changed, 10 insertions(+) diff --git a/Documentation/devicetree/bindings/i2c/i2c-designware.txt b/Documentation/devicetree/bindings/i2c/i2c-designware.txt index e42a2ee..84717fe 100644 --- a/Documentation/devicetree/bindings/i2c/i2c-designware.txt +++ b/Documentation/devicetree/bindings/i2c/i2c-designware.txt @@ -6,6 +6,11 @@ Required properties : - reg : Offset and length of the register set for the device - interrupts : where IRQ is the interrupt number. +Optional properties: + + - rx-fifo-size : 1 cell, Rx fifo size + - tx-fifo-size : 1 cell, Tx fifo size + 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>; }; diff --git a/drivers/i2c/busses/i2c-designware-platdrv.c b/drivers/i2c/busses/i2c-designware-platdrv.c index 41659c0..6760cea 100644 --- a/drivers/i2c/busses/i2c-designware-platdrv.c +++ b/drivers/i2c/busses/i2c-designware-platdrv.c @@ -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; -- 1.7.9.5