diff --git a/Documentation/devicetree/bindings/i2c/i2c-designware.txt b/Documentation/devicetree/bindings/i2c/i2c-designware.txt index e42a2ee233e65160f85840a74814a16774a714db..7fd7fa25e9b0f084cec79cd6a5a4c24e1a75fa77 100644 --- a/Documentation/devicetree/bindings/i2c/i2c-designware.txt +++ b/Documentation/devicetree/bindings/i2c/i2c-designware.txt @@ -10,6 +10,10 @@ Recommended properties : - clock-frequency : desired I2C bus clock frequency in Hz. +Optional properties : + - i2c-sda-hold-time-ns : should contain the SDA hold time in nanoseconds. + This option is only supported in hardware blocks version 1.11a or newer. + Example : i2c@f0000 { @@ -20,3 +24,14 @@ Example : interrupts = <11>; clock-frequency = <400000>; }; + + i2c@1120000 { + #address-cells = <1>; + #size-cells = <0>; + compatible = "snps,designware-i2c"; + reg = <0x1120000 0x1000>; + interrupt-parent = <&ictl>; + interrupts = <12 1>; + clock-frequency = <400000>; + i2c-sda-hold-time-ns = <300>; + }; diff --git a/arch/arc/boot/dts/abilis_tb100_dvk.dts b/arch/arc/boot/dts/abilis_tb100_dvk.dts index 0fa0d4abe79557cf8338c92ddf2a58a3e9d9d61c..ebc313a9f5b248df51352f909697afca5cc9e88f 100644 --- a/arch/arc/boot/dts/abilis_tb100_dvk.dts +++ b/arch/arc/boot/dts/abilis_tb100_dvk.dts @@ -45,19 +45,19 @@ }; i2c0: i2c@FF120000 { - sda-hold-time = <432>; + i2c-sda-hold-time-ns = <432>; }; i2c1: i2c@FF121000 { - sda-hold-time = <432>; + i2c-sda-hold-time-ns = <432>; }; i2c2: i2c@FF122000 { - sda-hold-time = <432>; + i2c-sda-hold-time-ns = <432>; }; i2c3: i2c@FF123000 { - sda-hold-time = <432>; + i2c-sda-hold-time-ns = <432>; }; i2c4: i2c@FF124000 { - sda-hold-time = <432>; + i2c-sda-hold-time-ns = <432>; }; leds { diff --git a/arch/arc/boot/dts/abilis_tb101_dvk.dts b/arch/arc/boot/dts/abilis_tb101_dvk.dts index a4d80ce283aec1e7df6ca447fadc2a31b72f8b2c..b204657993aab2fca0127365b74aaced843b9a2e 100644 --- a/arch/arc/boot/dts/abilis_tb101_dvk.dts +++ b/arch/arc/boot/dts/abilis_tb101_dvk.dts @@ -45,19 +45,19 @@ }; i2c0: i2c@FF120000 { - sda-hold-time = <432>; + i2c-sda-hold-time-ns = <432>; }; i2c1: i2c@FF121000 { - sda-hold-time = <432>; + i2c-sda-hold-time-ns = <432>; }; i2c2: i2c@FF122000 { - sda-hold-time = <432>; + i2c-sda-hold-time-ns = <432>; }; i2c3: i2c@FF123000 { - sda-hold-time = <432>; + i2c-sda-hold-time-ns = <432>; }; i2c4: i2c@FF124000 { - sda-hold-time = <432>; + i2c-sda-hold-time-ns = <432>; }; leds { diff --git a/drivers/i2c/busses/i2c-designware-core.c b/drivers/i2c/busses/i2c-designware-core.c index 3de5494369929456bfd217e82de479fefc7a3f0c..ad46616de29ec8638aeb2a17c6ff231d59c57596 100644 --- a/drivers/i2c/busses/i2c-designware-core.c +++ b/drivers/i2c/busses/i2c-designware-core.c @@ -67,9 +67,12 @@ #define DW_IC_STATUS 0x70 #define DW_IC_TXFLR 0x74 #define DW_IC_RXFLR 0x78 +#define DW_IC_SDA_HOLD 0x7c #define DW_IC_TX_ABRT_SOURCE 0x80 #define DW_IC_ENABLE_STATUS 0x9c #define DW_IC_COMP_PARAM_1 0xf4 +#define DW_IC_COMP_VERSION 0xf8 +#define DW_IC_SDA_HOLD_MIN_VERS 0x3131312A #define DW_IC_COMP_TYPE 0xfc #define DW_IC_COMP_TYPE_VALUE 0x44570140 @@ -332,6 +335,16 @@ int i2c_dw_init(struct dw_i2c_dev *dev) dw_writel(dev, lcnt, DW_IC_FS_SCL_LCNT); dev_dbg(dev->dev, "Fast-mode HCNT:LCNT = %d:%d\n", hcnt, lcnt); + /* Configure SDA Hold Time if required */ + if (dev->sda_hold_time) { + reg = dw_readl(dev, DW_IC_COMP_VERSION); + if (reg >= DW_IC_SDA_HOLD_MIN_VERS) + dw_writel(dev, dev->sda_hold_time, DW_IC_SDA_HOLD); + else + dev_warn(dev->dev, + "Hardware too old to adjust SDA hold time."); + } + /* Configure Tx/Rx FIFO threshold levels */ dw_writel(dev, dev->tx_fifo_depth - 1, DW_IC_TX_TL); dw_writel(dev, 0, DW_IC_RX_TL); diff --git a/drivers/i2c/busses/i2c-designware-core.h b/drivers/i2c/busses/i2c-designware-core.h index e761ad18dd61b8888e77a2989b772f79431d8b26..912aa22628664a41ed2b8975e4548085555830a4 100644 --- a/drivers/i2c/busses/i2c-designware-core.h +++ b/drivers/i2c/busses/i2c-designware-core.h @@ -90,6 +90,7 @@ struct dw_i2c_dev { unsigned int tx_fifo_depth; unsigned int rx_fifo_depth; int rx_outstanding; + u32 sda_hold_time; }; #define ACCESS_SWAP 0x00000001 diff --git a/drivers/i2c/busses/i2c-designware-platdrv.c b/drivers/i2c/busses/i2c-designware-platdrv.c index ee46c92d7e3ca63067fafe0b8be4ecd17640e935..def79b5fd4c8af986078af105186430a7287ebcf 100644 --- a/drivers/i2c/busses/i2c-designware-platdrv.c +++ b/drivers/i2c/busses/i2c-designware-platdrv.c @@ -34,6 +34,7 @@ #include #include #include +#include #include #include #include @@ -115,6 +116,15 @@ static int dw_i2c_probe(struct platform_device *pdev) return PTR_ERR(dev->clk); clk_prepare_enable(dev->clk); + if (pdev->dev.of_node) { + u32 ht = 0; + u32 ic_clk = dev->get_clk_rate_khz(dev); + + of_property_read_u32(pdev->dev.of_node, + "i2c-sda-hold-time-ns", &ht); + dev->sda_hold_time = ((u64)ic_clk * ht + 500000) / 1000000; + } + dev->functionality = I2C_FUNC_I2C | I2C_FUNC_10BIT_ADDR |