On Mon, Jul 30, 2012 at 12:51 PM, Heiko Schocher <hs@xxxxxxx> wrote: > add of support for the davinci i2c driver. > > Signed-off-by: Heiko Schocher <hs@xxxxxxx> > Signed-off-by: Sekhar Nori <nsekhar@xxxxxx> > Cc: davinci-linux-open-source@xxxxxxxxxxxxxxxxxxxx > Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx > Cc: devicetree-discuss@xxxxxxxxxxxxxxxx > Cc: linux-i2c@xxxxxxxxxxxxxxx > Cc: Ben Dooks <ben-linux@xxxxxxxxx> > Cc: Wolfram Sang <w.sang@xxxxxxxxxxxxxx> > Cc: Grant Likely <grant.likely@xxxxxxxxxxxx> > Cc: Sekhar Nori <nsekhar@xxxxxx> > Cc: Wolfgang Denk <wd@xxxxxxx> > Cc: Sylwester Nawrocki <s.nawrocki@xxxxxxxxxxx> > > --- > - changes for v2: > - add comments from Sylwester Nawrocki <s.nawrocki@xxxxxxxxxxx>: > - use "cell-index" instead "id" > - OF_DEV_AUXDATA in the machine code, instead pre-define platform > device name > - add comment from Grant Likely: > - removed "id" resp. "cell-index" completely > - fixed documentation > - use of_match_ptr() > - use devm_kzalloc() for allocating plattform data mem > - fixed a whitespace issue > - no changes for v3 > - changes for v4 > remove "pinmux-handle" property as discussed here: > http://www.spinics.net/lists/arm-kernel/msg175701.html > with Nori Sekhar > > - changes for v5 > add comments from Grant Likely: > - do not change value of dev->dev->platform_data, instead > hold a copy in davinci_i2c_dev. > > - changes for v6: > add comments from Sekhar Nori: > - removed unneccessary include > - merge patch from Sekhar Nori: > setup the newly introduced dev->pdata member correctly once in > probe -> i2c_get_plattformdata(() not needed, remove a lot of > checks for pdata in code > - add Signed-off-by: Sekhar Nori <nsekhar@xxxxxx> > - patch no longer in patchserie, as it has no dependencies. > > - changes for v7: > add comments from Wolfram Sang: > - move Documentation/devicetree/bindings/arm/davinci/i2c.txt > to Documentation/devicetree/bindings/i2c/davinci.txt > - remove bus-delay property > > Documentation/devicetree/bindings/i2c/davinci.txt | 28 ++++++++++++ > drivers/i2c/busses/i2c-davinci.c | 48 ++++++++++++++++----- > 2 files changed, 65 insertions(+), 11 deletions(-) > create mode 100644 Documentation/devicetree/bindings/i2c/davinci.txt > > diff --git a/Documentation/devicetree/bindings/i2c/davinci.txt b/Documentation/devicetree/bindings/i2c/davinci.txt > new file mode 100644 > index 0000000..c79078e > --- /dev/null > +++ b/Documentation/devicetree/bindings/i2c/davinci.txt > @@ -0,0 +1,28 @@ > +* Texas Instruments Davinci I2C > + > +This file provides information, what the device node for the > +davinci i2c interface contain. > + > +Required properties: > +- compatible: "ti,davinci-i2c"; > +- reg : Offset and length of the register set for the device > + > +Recommended properties : > +- interrupts : <a> standard interrupt property. > +- clock-frequency : desired I2C bus clock frequency in Hz. > + > +Example (enbw_cmc board): > + i2c@1c22000 { > + compatible = "ti,davinci-i2c"; > + reg = <0x22000 0x1000>; > + clock-frequency = <100000>; > + interrupts = <15>; > + interrupt-parent = <&intc>; > + #address-cells = <1>; > + #size-cells = <0>; > + > + dtt@48 { > + compatible = "national,lm75"; > + reg = <0x48>; > + }; > + }; > diff --git a/drivers/i2c/busses/i2c-davinci.c b/drivers/i2c/busses/i2c-davinci.c > index 79b4bcb..b6185dc 100644 > --- a/drivers/i2c/busses/i2c-davinci.c > +++ b/drivers/i2c/busses/i2c-davinci.c > @@ -38,6 +38,8 @@ > #include <linux/slab.h> > #include <linux/cpufreq.h> > #include <linux/gpio.h> > +#include <linux/of_i2c.h> > +#include <linux/of_device.h> > > #include <mach/hardware.h> > #include <mach/i2c.h> > @@ -114,6 +116,7 @@ struct davinci_i2c_dev { > struct completion xfr_complete; > struct notifier_block freq_transition; > #endif > + struct davinci_i2c_platform_data *pdata; > }; > > /* default platform data to use if not supplied in the platform_device */ > @@ -155,7 +158,7 @@ static void generic_i2c_clock_pulse(unsigned int scl_pin) > static void i2c_recover_bus(struct davinci_i2c_dev *dev) > { > u32 flag = 0; > - struct davinci_i2c_platform_data *pdata = dev->dev->platform_data; > + struct davinci_i2c_platform_data *pdata = dev->pdata; > > dev_err(dev->dev, "initiating i2c bus recovery\n"); > /* Send NACK to the slave */ > @@ -163,8 +166,7 @@ static void i2c_recover_bus(struct davinci_i2c_dev *dev) > flag |= DAVINCI_I2C_MDR_NACK; > /* write the data into mode register */ > davinci_i2c_write_reg(dev, DAVINCI_I2C_MDR_REG, flag); > - if (pdata) > - generic_i2c_clock_pulse(pdata->scl_pin); > + generic_i2c_clock_pulse(pdata->scl_pin); > /* Send STOP */ > flag = davinci_i2c_read_reg(dev, DAVINCI_I2C_MDR_REG); > flag |= DAVINCI_I2C_MDR_STP; > @@ -187,7 +189,7 @@ static inline void davinci_i2c_reset_ctrl(struct davinci_i2c_dev *i2c_dev, > > static void i2c_davinci_calc_clk_dividers(struct davinci_i2c_dev *dev) > { > - struct davinci_i2c_platform_data *pdata = dev->dev->platform_data; > + struct davinci_i2c_platform_data *pdata = dev->pdata; > u16 psc; > u32 clk; > u32 d; > @@ -235,10 +237,7 @@ static void i2c_davinci_calc_clk_dividers(struct davinci_i2c_dev *dev) > */ > static int i2c_davinci_init(struct davinci_i2c_dev *dev) > { > - struct davinci_i2c_platform_data *pdata = dev->dev->platform_data; > - > - if (!pdata) > - pdata = &davinci_i2c_platform_data_default; > + struct davinci_i2c_platform_data *pdata = dev->pdata; > > /* put I2C into reset */ > davinci_i2c_reset_ctrl(dev, 0); > @@ -260,6 +259,7 @@ static int i2c_davinci_init(struct davinci_i2c_dev *dev) > dev_dbg(dev->dev, "bus_freq = %dkHz, bus_delay = %d\n", > pdata->bus_freq, pdata->bus_delay); > > + > /* Take the I2C module out of reset: */ > davinci_i2c_reset_ctrl(dev, 1); > > @@ -308,13 +308,11 @@ static int > i2c_davinci_xfer_msg(struct i2c_adapter *adap, struct i2c_msg *msg, int stop) > { > struct davinci_i2c_dev *dev = i2c_get_adapdata(adap); > - struct davinci_i2c_platform_data *pdata = dev->dev->platform_data; > + struct davinci_i2c_platform_data *pdata = dev->pdata; > u32 flag; > u16 w; > int r; > > - if (!pdata) > - pdata = &davinci_i2c_platform_data_default; > /* Introduce a delay, required for some boards (e.g Davinci EVM) */ > if (pdata->bus_delay) > udelay(pdata->bus_delay); > @@ -635,6 +633,12 @@ static struct i2c_algorithm i2c_davinci_algo = { > .functionality = i2c_davinci_func, > }; > > +static const struct of_device_id davinci_i2c_of_match[] = { > + {.compatible = "ti,davinci-i2c", }, > + {}, > +}; > +MODULE_DEVICE_TABLE(of, davinci_i2c_of_match); > + Should this be protected under OF flag? -- To unsubscribe from this list: send the line "unsubscribe linux-i2c" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
