On 08/21/2012 04:29 PM, [email protected] : > From: Ludovic Desroches <[email protected]> > > The at91sam9261 TWI ip version requires also some fixes. The id_entry > field from the platform device structure has been replaced by the use > of cpu_is_xxx function to determine when to use these fixes.
No, for this one. The current tendency is to remove the use of cpu_is_xxx() functions. So yes, you will have to keep the use of struct platform_device_id in this driver and extend it with the device tree information. > Signed-off-by: Ludovic Desroches <[email protected]> > --- > arch/arm/mach-at91/at91rm9200_devices.c | 9 ------- > drivers/i2c/busses/i2c-at91.c | 42 > +++++++++++++++++++-------------- > 2 files changed, 24 insertions(+), 27 deletions(-) > > diff --git a/arch/arm/mach-at91/at91rm9200_devices.c > b/arch/arm/mach-at91/at91rm9200_devices.c > index 2b9b493..e6b7d05 100644 > --- a/arch/arm/mach-at91/at91rm9200_devices.c > +++ b/arch/arm/mach-at91/at91rm9200_devices.c > @@ -494,18 +494,9 @@ static struct resource twi_resources[] = { > }, > }; > > -static const struct platform_device_id twi_id = { > - /* > - * driver_data is "1" for hardware with ckdiv upper limit == 5 > - * (AT91RM9200 erratum 22), "0" for twi modules without this bug > - */ > - .driver_data = 1, > -}; > - > static struct platform_device at91rm9200_twi_device = { > .name = "at91_i2c", > .id = -1, > - .id_entry = &twi_id, > .resource = twi_resources, > .num_resources = ARRAY_SIZE(twi_resources), > }; > diff --git a/drivers/i2c/busses/i2c-at91.c b/drivers/i2c/busses/i2c-at91.c > index b1cb780..4599522 100644 > --- a/drivers/i2c/busses/i2c-at91.c > +++ b/drivers/i2c/busses/i2c-at91.c > @@ -27,6 +27,8 @@ > #include <linux/platform_device.h> > #include <linux/slab.h> > > +#include <mach/cpu.h> > + > #define TWI_CLK_HZ 100000 /* max 400 Kbits/s */ > #define AT91_I2C_TIMEOUT msecs_to_jiffies(100) /* transfer timeout */ > > @@ -72,7 +74,6 @@ struct at91_twi_dev { > int irq; > unsigned transfer_status; > struct i2c_adapter adapter; > - bool is_rm9200; > unsigned twi_cwgr_reg; > }; > > @@ -111,20 +112,28 @@ static void at91_init_twi_bus(struct at91_twi_dev *dev) > */ > static void __devinit at91_calc_twi_clock(struct at91_twi_dev *dev, int > twi_clk) > { > - const int offset = dev->is_rm9200 ? 3 : 4; > - const int div = max(0, (int)DIV_ROUND_UP(clk_get_rate(dev->clk), > - 2 * twi_clk) - offset); > - int ckdiv = fls(div >> 8); > - int cdiv = div >> ckdiv; > - > - if (dev->is_rm9200 && (ckdiv > 5)) { > - dev_warn(dev->dev, "AT91RM9200 erratum 22: using ckdiv = 5.\n"); > - ckdiv = 5; > - cdiv = 255; > - } else if (ckdiv > 7) { > - dev_warn(dev->dev, "%d exceeds 3 bits for ckdiv, limiting.\n", > - ckdiv); > - ckdiv = 7; > + int offset, div, max_ckdiv, ckdiv, cdiv; > + > + if (cpu_is_at91rm9200()) { > + offset = 3; > + max_ckdiv = 5; > + } else if (cpu_is_at91sam9261()) { > + offset = 4; > + max_ckdiv = 5; > + } else { > + offset = 4; > + max_ckdiv = 7; > + } > + > + div = max(0, (int)DIV_ROUND_UP(clk_get_rate(dev->clk), > + 2 * twi_clk) - offset); > + ckdiv = fls(div >> 8); > + cdiv = div >> ckdiv; > + > + if (ckdiv > max_ckdiv) { > + dev_warn(dev->dev, "%d exceeds ckdiv max value which is %d.\n", > + ckdiv, max_ckdiv); > + ckdiv = max_ckdiv; > cdiv = 255; > } > > @@ -331,9 +340,6 @@ static int __devinit at91_twi_probe(struct > platform_device *pdev) > goto err_release_region; > } > > - if (pdev->id_entry && pdev->id_entry->driver_data == 1) > - dev->is_rm9200 = 1; > - > init_completion(&dev->cmd_complete); > > dev->dev = &pdev->dev; > -- Nicolas Ferre -- To unsubscribe from this list: send the line "unsubscribe linux-i2c" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
