| Message ID | 1312050087-15701-3-git-send-email-shawn.guo@linaro.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
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@linaro.org> > Cc: Grant Likely <grant.likely@secretlab.ca> > Cc: Darius Augulis <augulis.darius@gmail.com> > Cc: Ben Dooks <ben-linux@fluff.org> > Acked-by: Grant Likely <grant.likely@secretlab.ca> > --- > .../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 > > -- > To unsubscribe from this list: send the line "unsubscribe linux-i2c" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html
On 1 August 2011 22:25, Ben Dooks <ben-i2c@fluff.org> wrote: > 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@linaro.org> >> Cc: Grant Likely <grant.likely@secretlab.ca> >> Cc: Darius Augulis <augulis.darius@gmail.com> >> Cc: Ben Dooks <ben-linux@fluff.org> >> Acked-by: Grant Likely <grant.likely@secretlab.ca> >> --- >> .../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? > Yes, "clock-frequency" is a common property for all clock frequency binding, not only for of-i2c but all drivers that need to get clock frequency from device tree. And it's a u32 and being read by the common OF API of_property_read_u32(). So to answer your question, both the binding and code have already been standard. Regards, Shawn >> 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 >> >> -- >> To unsubscribe from this list: send the line "unsubscribe linux-i2c" in >> the body of a message to majordomo@vger.kernel.org >> More majordomo info at http://vger.kernel.org/majordomo-info.html >
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>; +}; 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, } };