From mboxrd@z Thu Jan 1 00:00:00 1970 From: Zhangfei Gao Subject: [PATCH v4 2/2] i2c: designware: add two optional property tx/rx-fifo-size Date: Fri, 26 Jul 2013 21:22:18 +0800 Message-ID: <1374844938-25505-3-git-send-email-zhangfei.gao@linaro.org> References: <1374844938-25505-1-git-send-email-zhangfei.gao@linaro.org> Return-path: In-Reply-To: <1374844938-25505-1-git-send-email-zhangfei.gao-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org> Sender: linux-i2c-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Wolfram Sang , Baruch Siach Cc: linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, linux-i2c-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Zhangfei Gao List-Id: linux-i2c@vger.kernel.org Some platform can not get fifo-size info form register DW_IC_COMP_PARAM_1. Give chance to update rx-fifo-size and tx-fifo-size if provided in dts. Signed-off-by: Zhangfei Gao Acked-by: 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 7fd7fa2..af0bf8f 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. @@ -22,6 +27,8 @@ 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 36ceebc..f657e65 100644 --- a/drivers/i2c/busses/i2c-designware-platdrv.c +++ b/drivers/i2c/busses/i2c-designware-platdrv.c @@ -86,6 +86,7 @@ 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; irq = platform_get_irq(pdev, 0); @@ -145,6 +146,8 @@ 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