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authorWolfgang Grandegger <wg@grandegger.com>2009-04-07 10:20:55 +0200
committerBen Dooks <ben-linux@fluff.org>2009-04-07 10:18:47 +0100
commitf2bd5efe723814916ece92ccfa0bffb085c94b94 (patch)
tree111f6224df4c31983809d06c1e03c531fb52ebcb /arch/powerpc
parent54377cd059061637b627e236a459c58e274f35c6 (diff)
i2c: i2c-mpc: make I2C bus speed configurable
This patch makes the I2C bus speed configurable by using the I2C node property "clock-frequency". If the property is not defined, the old fixed clock settings will be used for backward comptibility. The generic I2C clock properties, especially the CPU-specific source clock pre-scaler are defined via the OF match table: static const struct of_device_id mpc_i2c_of_match[] = { ... {.compatible = "fsl,mpc8543-i2c", .data = &(struct fsl_i2c_match_data) { .setclock = mpc_i2c_setclock_8xxx, .prescaler = 2, }, }, The "data" field defines the relevant I2C setclock function and the relevant pre-scaler for the I2C source clock frequency. It uses arch-specific tables and functions to determine resonable Freqency Divider Register (fdr) values for MPC83xx, MPC85xx, MPC86xx, MPC5200 and MPC5200B. The i2c->flags field and the corresponding FSL_I2C_DEV_* definitions have been removed as they are obsolete. Signed-off-by: Wolfgang Grandegger <wg@grandegger.com> Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Diffstat (limited to 'arch/powerpc')
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