The i2c node property "fsl,preserve-clocking" allows to overtake the clock settings from the boot loader avoiding the hard-coded settings.
Signed-off-by: Wolfgang Grandegger <[email protected]> --- Documentation/powerpc/dts-bindings/fsl/i2c.txt | 2 ++ drivers/i2c/busses/i2c-mpc.c | 20 +++++++++++--------- 2 files changed, 13 insertions(+), 9 deletions(-) Index: linux-2.6/drivers/i2c/busses/i2c-mpc.c =================================================================== --- linux-2.6.orig/drivers/i2c/busses/i2c-mpc.c 2009-03-31 13:25:08.000000000 +0200 +++ linux-2.6/drivers/i2c/busses/i2c-mpc.c 2009-03-31 21:29:21.615721143 +0200 @@ -323,13 +323,6 @@ if (!i2c) return -ENOMEM; - if (of_get_property(op->node, "dfsrr", NULL)) - i2c->flags |= FSL_I2C_DEV_SEPARATE_DFSRR; - - if (of_device_is_compatible(op->node, "fsl,mpc5200-i2c") || - of_device_is_compatible(op->node, "mpc5200-i2c")) - i2c->flags |= FSL_I2C_DEV_CLOCK_5200; - init_waitqueue_head(&i2c->queue); i2c->base = of_iomap(op->node, 0); @@ -348,8 +341,17 @@ goto fail_request; } } - - mpc_i2c_setclock(i2c); + + if (!of_get_property(op->node, "fsl,preserve-clocking", NULL)) { + if (of_get_property(op->node, "dfsrr", NULL)) + i2c->flags |= FSL_I2C_DEV_SEPARATE_DFSRR; + + if (of_device_is_compatible(op->node, "fsl,mpc5200-i2c") || + of_device_is_compatible(op->node, "mpc5200-i2c")) + i2c->flags |= FSL_I2C_DEV_CLOCK_5200; + + mpc_i2c_setclock(i2c); + } dev_set_drvdata(&op->dev, i2c); Index: linux-2.6/Documentation/powerpc/dts-bindings/fsl/i2c.txt =================================================================== --- linux-2.6.orig/Documentation/powerpc/dts-bindings/fsl/i2c.txt 2009-03-17 10:28:07.000000000 +0100 +++ linux-2.6/Documentation/powerpc/dts-bindings/fsl/i2c.txt 2009-03-31 21:35:51.527901532 +0200 @@ -20,6 +20,8 @@ a digital filter sampling rate register - fsl5200-clocking : boolean; if defined, indicated that this device uses the FSL 5200 clocking mechanism. + - fsl,preserve-clocking : boolean; if defined, the clock settings + from the bootloader are preserved (not touched). Example : i...@3000 { _______________________________________________ devicetree-discuss mailing list [email protected] https://ozlabs.org/mailman/listinfo/devicetree-discuss
