From 43fea5813c56e4327371fd3c2209791ef7822de2 Mon Sep 17 00:00:00 2001 From: Lee Jones Date: Mon, 6 Aug 2012 11:09:57 +0100 Subject: i2c: nomadik: Add Device Tree support to the Nomadik I2C driver Here we apply the bindings required for successful Device Tree probing of the i2c-nomadik driver. Signed-off-by: Lee Jones Acked-by: Linus Walleij Signed-off-by: Wolfram Sang --- Documentation/devicetree/bindings/i2c/nomadik.txt | 23 +++++++++++++++ drivers/i2c/busses/i2c-nomadik.c | 35 +++++++++++++++++++++-- include/linux/platform_data/i2c-nomadik.h | 2 +- 3 files changed, 56 insertions(+), 4 deletions(-) create mode 100644 Documentation/devicetree/bindings/i2c/nomadik.txt diff --git a/Documentation/devicetree/bindings/i2c/nomadik.txt b/Documentation/devicetree/bindings/i2c/nomadik.txt new file mode 100644 index 000000000000..72065b0ff680 --- /dev/null +++ b/Documentation/devicetree/bindings/i2c/nomadik.txt @@ -0,0 +1,23 @@ +I2C for Nomadik based systems + +Required (non-standard) properties: + - Nil + +Recommended (non-standard) properties: + - clock-frequency : Maximum bus clock frequency for the device + +Optional (non-standard) properties: + - Nil + +Example : + +i2c@80004000 { + compatible = "stericsson,db8500-i2c", "st,nomadik-i2c"; + reg = <0x80004000 0x1000>; + interrupts = <0 21 0x4>; + #address-cells = <1>; + #size-cells = <0>; + v-i2c-supply = <&db8500_vape_reg>; + + clock-frequency = <400000>; +}; diff --git a/drivers/i2c/busses/i2c-nomadik.c b/drivers/i2c/busses/i2c-nomadik.c index 1b898b647ec2..698d7acb0f08 100644 --- a/drivers/i2c/busses/i2c-nomadik.c +++ b/drivers/i2c/busses/i2c-nomadik.c @@ -24,6 +24,8 @@ #include #include #include +#include +#include #define DRIVER_NAME "nmk-i2c" @@ -913,18 +915,42 @@ static struct nmk_i2c_controller u8500_i2c = { .sm = I2C_FREQ_MODE_FAST, }; +static void nmk_i2c_of_probe(struct device_node *np, + struct nmk_i2c_controller *pdata) +{ + of_property_read_u32(np, "clock-frequency", &pdata->clk_freq); + + /* This driver only supports 'standard' and 'fast' modes of operation. */ + if (pdata->clk_freq <= 100000) + pdata->sm = I2C_FREQ_MODE_STANDARD; + else + pdata->sm = I2C_FREQ_MODE_FAST; +} + static atomic_t adapter_id = ATOMIC_INIT(0); static int nmk_i2c_probe(struct amba_device *adev, const struct amba_id *id) { int ret = 0; struct nmk_i2c_controller *pdata = adev->dev.platform_data; + struct device_node *np = adev->dev.of_node; struct nmk_i2c_dev *dev; struct i2c_adapter *adap; - if (!pdata) - /* No i2c configuration found, using the default. */ - pdata = &u8500_i2c; + if (!pdata) { + if (np) { + pdata = devm_kzalloc(&adev->dev, sizeof(*pdata), GFP_KERNEL); + if (!pdata) { + ret = -ENOMEM; + goto err_no_mem; + } + /* Provide the default configuration as a base. */ + memcpy(pdata, &u8500_i2c, sizeof(struct nmk_i2c_controller)); + nmk_i2c_of_probe(np, pdata); + } else + /* No i2c configuration found, using the default. */ + pdata = &u8500_i2c; + } dev = kzalloc(sizeof(struct nmk_i2c_dev), GFP_KERNEL); if (!dev) { @@ -960,6 +986,7 @@ static int nmk_i2c_probe(struct amba_device *adev, const struct amba_id *id) } adap = &dev->adap; + adap->dev.of_node = np; adap->dev.parent = &adev->dev; adap->owner = THIS_MODULE; adap->class = I2C_CLASS_HWMON | I2C_CLASS_SPD; @@ -989,6 +1016,8 @@ static int nmk_i2c_probe(struct amba_device *adev, const struct amba_id *id) goto err_add_adap; } + of_i2c_register_devices(adap); + pm_runtime_put(&adev->dev); return 0; diff --git a/include/linux/platform_data/i2c-nomadik.h b/include/linux/platform_data/i2c-nomadik.h index c2303c3e4803..3a8be9cdc95c 100644 --- a/include/linux/platform_data/i2c-nomadik.h +++ b/include/linux/platform_data/i2c-nomadik.h @@ -28,7 +28,7 @@ enum i2c_freq_mode { * @sm: speed mode */ struct nmk_i2c_controller { - unsigned long clk_freq; + u32 clk_freq; unsigned short slsu; unsigned char tft; unsigned char rft; -- cgit v1.2.3