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    Subject[PATCH v2 2/2] spi: spi-ti-qspi: Add checking which flash chip has been mmap-ed
    Date
    This patch allows placing more than one flash chip on the qspi bus
    by checking which spi device has been memory-mapped and remapping
    if necessary.

    Signed-off-by: Arkadiusz Kwiatkowski <arkadiusz.kwiatkowski@aptiv.com>
    ---
    drivers/spi/spi-ti-qspi.c | 16 ++++++++++------
    1 file changed, 10 insertions(+), 6 deletions(-)

    diff --git a/drivers/spi/spi-ti-qspi.c b/drivers/spi/spi-ti-qspi.c
    index d0ea62d..5b99a1e 100644
    --- a/drivers/spi/spi-ti-qspi.c
    +++ b/drivers/spi/spi-ti-qspi.c
    @@ -66,7 +66,7 @@ struct ti_qspi {
    u32 cmd;
    u32 dc;

    - bool mmap_enabled;
    + struct spi_device *mmap_spi_device;
    };

    #define QSPI_PID (0x0)
    @@ -493,7 +493,7 @@ static void ti_qspi_enable_memory_map(struct spi_device *spi)
    MEM_CS_MASK,
    MEM_CS_EN(spi->chip_select));
    }
    - qspi->mmap_enabled = true;
    + qspi->mmap_spi_device = spi;
    }

    static void ti_qspi_disable_memory_map(struct spi_device *spi)
    @@ -504,7 +504,7 @@ static void ti_qspi_disable_memory_map(struct spi_device *spi)
    if (qspi->ctrl_base)
    regmap_update_bits(qspi->ctrl_base, qspi->ctrl_reg,
    MEM_CS_MASK, 0);
    - qspi->mmap_enabled = false;
    + qspi->mmap_spi_device = NULL;
    }

    static void ti_qspi_setup_mmap_read(struct spi_device *spi,
    @@ -544,8 +544,12 @@ static int ti_qspi_spi_flash_read(struct spi_device *spi,

    mutex_lock(&qspi->list_lock);

    - if (!qspi->mmap_enabled)
    + if (qspi->mmap_spi_device != spi) {
    + if (qspi->mmap_spi_device)
    + ti_qspi_disable_memory_map(qspi->mmap_spi_device);
    ti_qspi_enable_memory_map(spi);
    + }
    +
    ti_qspi_setup_mmap_read(spi, msg);

    if (qspi->rx_chan) {
    @@ -600,7 +604,7 @@ static int ti_qspi_start_transfer_one(struct spi_master *master,

    mutex_lock(&qspi->list_lock);

    - if (qspi->mmap_enabled)
    + if (qspi->mmap_spi_device)
    ti_qspi_disable_memory_map(spi);

    list_for_each_entry(t, &m->transfers, transfer_list) {
    @@ -787,7 +791,7 @@ static int ti_qspi_probe(struct platform_device *pdev)
    master->spi_flash_read = NULL;
    }
    }
    - qspi->mmap_enabled = false;
    + qspi->mmap_spi_device = NULL;

    ret = devm_spi_register_master(&pdev->dev, master);
    if (!ret)
    --
    2.7.4
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