[PATCH v3 2/2] i2c-imx: add device tree probe support
From: Shawn Guo <hidden>
Date: 2011-09-15 15:39:53
Also in:
linux-devicetree, linux-i2c
Subsystem:
freescale imx i2c driver, i2c subsystem, i2c subsystem host drivers, open firmware and flattened device tree bindings, the rest · Maintainers:
Oleksij Rempel, Andi Shyti, Rob Herring, Krzysztof Kozlowski, Conor Dooley, Linus Torvalds
It adds device tree probe support for i2c-imx driver. Signed-off-by: Shawn Guo <redacted> Cc: Grant Likely <redacted> Cc: Darius Augulis <redacted> Cc: Ben Dooks <ben-linux@fluff.org> Acked-by: Grant Likely <redacted> --- .../devicetree/bindings/i2c/fsl-imx-i2c.txt | 18 ++++++++++++++ drivers/i2c/busses/i2c-imx.c | 25 +++++++++++++++---- 2 files changed, 37 insertions(+), 6 deletions(-) create mode 100644 Documentation/devicetree/bindings/i2c/fsl-imx-i2c.txt
diff --git a/Documentation/devicetree/bindings/i2c/fsl-imx-i2c.txt b/Documentation/devicetree/bindings/i2c/fsl-imx-i2c.txt
new file mode 100644
index 0000000..a5189e6
--- /dev/null
+++ b/Documentation/devicetree/bindings/i2c/fsl-imx-i2c.txt@@ -0,0 +1,18 @@ +* Freescale Inter IC (I2C) for i.MX + +Required properties: +- compatible : Should be "fsl,<chip>-i2c" +- reg : Should contain I2C registers location and length +- interrupts : Should contain I2C interrupt + +Optional properties: +- clock-frequency : Constains desired I2C bus clock frequency in Hz. + The absence of the propoerty indicates the default frequency 100 kHz. + +Examples: + +i2c at 83fc4000 { /* I2C2 on i.MX51 */ + compatible = "fsl,imx51-i2c", "fsl,imx1-i2c"; + reg = <0x83fc4000 0x4000>; + interrupts = <63>; +};
diff --git a/drivers/i2c/busses/i2c-imx.c b/drivers/i2c/busses/i2c-imx.c
index 54d809e..58832e5 100644
--- a/drivers/i2c/busses/i2c-imx.c
+++ b/drivers/i2c/busses/i2c-imx.c@@ -48,6 +48,9 @@ #include <linux/platform_device.h> #include <linux/clk.h> #include <linux/slab.h> +#include <linux/of.h> +#include <linux/of_device.h> +#include <linux/of_i2c.h> #include <mach/irqs.h> #include <mach/hardware.h>
@@ -125,6 +128,11 @@ struct imx_i2c_struct { unsigned int ifdr; /* IMX_I2C_IFDR */ }; +static const struct of_device_id i2c_imx_dt_ids[] = { + { .compatible = "fsl,imx1-i2c", }, + { /* sentinel */ } +}; + /** Functions for IMX I2C adapter driver *************************************** *******************************************************************************/
@@ -469,7 +477,7 @@ static int __init i2c_imx_probe(struct platform_device *pdev) struct imxi2c_platform_data *pdata = pdev->dev.platform_data; void __iomem *base; resource_size_t res_size; - int irq; + int irq, bitrate; int ret; dev_dbg(&pdev->dev, "<%s>\n", __func__);
@@ -512,6 +520,7 @@ static int __init i2c_imx_probe(struct platform_device *pdev) i2c_imx->adapter.algo = &i2c_imx_algo; i2c_imx->adapter.dev.parent = &pdev->dev; i2c_imx->adapter.nr = pdev->id; + i2c_imx->adapter.dev.of_node = pdev->dev.of_node; i2c_imx->irq = irq; i2c_imx->base = base; i2c_imx->res = res;
@@ -538,10 +547,12 @@ static int __init i2c_imx_probe(struct platform_device *pdev) i2c_set_adapdata(&i2c_imx->adapter, i2c_imx); /* Set up clock divider */ - if (pdata && pdata->bitrate) - i2c_imx_set_clk(i2c_imx, pdata->bitrate); - else - i2c_imx_set_clk(i2c_imx, IMX_I2C_BIT_RATE); + bitrate = IMX_I2C_BIT_RATE; + ret = of_property_read_u32(pdev->dev.of_node, + "clock-frequency", &bitrate); + if (ret < 0 && pdata && pdata->bitrate) + bitrate = pdata->bitrate; + i2c_imx_set_clk(i2c_imx, bitrate); /* Set up chip registers to defaults */ writeb(0, i2c_imx->base + IMX_I2C_I2CR);
@@ -554,6 +565,8 @@ static int __init i2c_imx_probe(struct platform_device *pdev) goto fail5; } + of_i2c_register_devices(&i2c_imx->adapter); + /* Set up platform driver data */ platform_set_drvdata(pdev, i2c_imx);
@@ -584,7 +597,6 @@ fail1: static int __exit i2c_imx_remove(struct platform_device *pdev) { struct imx_i2c_struct *i2c_imx = platform_get_drvdata(pdev); - struct imxi2c_platform_data *pdata = pdev->dev.platform_data; /* remove adapter */ dev_dbg(&i2c_imx->adapter.dev, "adapter removed\n");
@@ -613,6 +625,7 @@ static struct platform_driver i2c_imx_driver = { .driver = { .name = DRIVER_NAME, .owner = THIS_MODULE, + .of_match_table = i2c_imx_dt_ids, } };
--
1.7.4.1