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    Subject[PATCH 01/19] mfd-core: unconditionally add mfd_cell to every platform_device

    Previously, one would set the mfd_cell's platform_data/data_size to point
    to the current mfd_cell in order to pass that information along to drivers.

    This causes the current mfd_cell to always be available to drivers. It
    also adds a wrapper function for fetching the mfd cell from a platform
    device.

    Signed-off-by: Andres Salomon <dilinger@queued.net>
    ---
    drivers/mfd/mfd-core.c | 9 +++------
    include/linux/mfd/core.h | 12 ++++++++++--
    2 files changed, 13 insertions(+), 8 deletions(-)

    diff --git a/drivers/mfd/mfd-core.c b/drivers/mfd/mfd-core.c
    index d83ad0f..d8b9e35 100644
    --- a/drivers/mfd/mfd-core.c
    +++ b/drivers/mfd/mfd-core.c
    @@ -39,12 +39,9 @@ static int mfd_add_device(struct device *parent, int id,
    pdev->dev.parent = parent;
    platform_set_drvdata(pdev, cell->driver_data);

    - if (cell->data_size) {
    - ret = platform_device_add_data(pdev,
    - cell->platform_data, cell->data_size);
    - if (ret)
    - goto fail_res;
    - }
    + ret = platform_device_add_data(pdev, cell, sizeof(struct mfd_cell));
    + if (ret)
    + goto fail_res;

    for (r = 0; r < cell->num_resources; r++) {
    res[r].name = cell->resources[r].name;
    diff --git a/include/linux/mfd/core.h b/include/linux/mfd/core.h
    index 835996e..82b2a5c 100644
    --- a/include/linux/mfd/core.h
    +++ b/include/linux/mfd/core.h
    @@ -33,8 +33,7 @@ struct mfd_cell {
    /* driver-specific data for MFD-aware "cell" drivers */
    void *driver_data;

    - /* platform_data can be used to either pass data to "generic"
    - driver or as a hook to mfd_cell for the "cell" drivers */
    + /* These two are unused */
    void *platform_data;
    size_t data_size;

    @@ -55,6 +54,15 @@ struct mfd_cell {
    bool pm_runtime_no_callbacks;
    };

    +/*
    + * Given a platform device that's been created by mfd_add_devices(), fetch
    + * the mfd_cell that created it.
    + */
    +static inline const struct mfd_cell *mfd_get_cell(struct platform_device *pdev)
    +{
    + return pdev->dev.platform_data;
    +}
    +
    extern int mfd_add_devices(struct device *parent, int id,
    const struct mfd_cell *cells, int n_devs,
    struct resource *mem_base,
    --
    1.7.2.3


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