On Sun, Jul 31, 2011 at 02:21:27AM +0800, Shawn Guo wrote:
> It adds device tree probe support for i2c-imx driver.
>
> Signed-off-by: Shawn Guo <shawn.guo@xxxxxxxxxx>
> Cc: Grant Likely <grant.likely@xxxxxxxxxxxx>
> Cc: Darius Augulis <augulis.darius@xxxxxxxxx>
> Cc: Ben Dooks <ben-linux@xxxxxxxxx>
> Acked-by: Grant Likely <grant.likely@xxxxxxxxxxxx>
> ---
> .../devicetree/bindings/i2c/fsl-imx-i2c.txt | 25 ++++++++++++++++++++
> drivers/i2c/busses/i2c-imx.c | 25 +++++++++++++++----
> 2 files changed, 44 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..f3cf43b
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/i2c/fsl-imx-i2c.txt
> @@ -0,0 +1,25 @@
> +* Freescale Inter IC (I2C) and High Speed Inter IC (HS-I2C) for i.MX
> +
> +Required properties:
> +- compatible : Should be "fsl,<chip>-i2c"
> +- reg : Should contain I2C/HS-I2C registers location and length
> +- interrupts : Should contain I2C/HS-I2C interrupt
> +
> +Optional properties:
> +- clock-frequency : Constains desired I2C/HS-I2C bus clock frequency in Hz.
> + The absence of the propoerty indicates the default frequency 100 kHz.
> +
> +Examples:
> +
> +i2c@83fc4000 { /* I2C2 on i.MX51 */
> + compatible = "fsl,imx51-i2c", "fsl,imx1-i2c";
> + reg = <0x83fc4000 0x4000>;
> + interrupts = <63>;
> +};
> +
> +i2c@70038000 { /* HS-I2C on i.MX51 */
> + compatible = "fsl,imx51-i2c", "fsl,imx1-i2c";
> + reg = <0x70038000 0x4000>;
> + interrupts = <64>;
> + clock-frequency = <400000>;
> +};
It occurs to me that the clock-frequency field should be a standard
used by all of-i2c drivers? could we have a standardised set of
properties and a standard chunk of code that reads them?
> 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
>
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