[lkml]   [2011]   [Nov]   [23]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
    Subject[PATCH v7 0/5] AT91: replace broken TWI driver i2c-at91.c
    The old driver has two main deficencies:
    i) No repeated start (Sr) condiction is possible, this makes it unusable
    e.g. for most SMBus transfers.
    ii) I/O was done with polling/busy waiting what caused over-/underruns
    even at light system loads and clock speeds.

    The new driver overcomes these deficencies and in addition allows for
    more than one TWI interface.

    A remaining limitation is the fact, that only one repeated start is
    possible (two concatenated messages). This limitation is imposed by
    the hardware. However, this should not be a problem as all common
    i2c-client communication does not rely on more than one repeated start.

    v7: Patch 4/5: i) fix bug if internal address > 1 byte
    ii) send stop when len == 1
    (both reported by Carsten Behling)
    v6: Patch 5/5: support for I2C_SMBUS_BLOCK_DATA transfers.
    Better use of clk_(un)prepare().
    More sensible transfer timeout.
    v5: Another round of review comments from Ryan Mallon, Felipe Balbi
    and Russell King: convert twi clk to use .dev_id, cleanups
    v4: Integrated more review comments from Ryan Mallon and Felipe Balbi:
    Moved register include file to local include, code cleanups
    v3: Integrated review comments from Ryan Mallon and Felipe Balbi
    v2: Fixed whitespace issue

    Nikolaus Voss (5):
    drivers/i2c/busses/i2c-at91.c: remove broken driver
    Replace clk_lookup.con_id with clk_lookup.dev_id entries for twi clk
    drivers/i2c/busses/i2c-at91.c: add new driver
    G45 TWI: remove open drain setting for twi function gpios
    i2c-at91.c: add SMBUS_READ_BLOCK_DATA functionality

    arch/arm/mach-at91/at91cap9.c | 1 +
    arch/arm/mach-at91/at91rm9200.c | 1 +
    arch/arm/mach-at91/at91sam9260.c | 1 +
    arch/arm/mach-at91/at91sam9261.c | 1 +
    arch/arm/mach-at91/at91sam9263.c | 1 +
    arch/arm/mach-at91/at91sam9g45.c | 2 +
    arch/arm/mach-at91/at91sam9g45_devices.c | 6 -
    arch/arm/mach-at91/at91sam9rl.c | 2 +
    arch/arm/mach-at91/include/mach/at91_twi.h | 68 ----
    drivers/i2c/busses/Kconfig | 11 +-
    drivers/i2c/busses/i2c-at91.c | 529 +++++++++++++++++-----------
    drivers/i2c/busses/i2c-at91.h | 80 +++++
    12 files changed, 408 insertions(+), 295 deletions(-)
    delete mode 100644 arch/arm/mach-at91/include/mach/at91_twi.h
    create mode 100644 drivers/i2c/busses/i2c-at91.h


     \ /
      Last update: 2011-11-23 17:01    [W:0.022 / U:1.644 seconds]
    ©2003-2017 Jasper Spaans. hosted at Digital OceanAdvertise on this site