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Commit 3ffa1a5d authored by Gao Pan's avatar Gao Pan Committed by Mark Brown
Browse files

spi: imx: use prepare_transfer_hardware() for lpspi 



The old driver enable clk in fsl_lpspi_prepare_message() and
disable clk in fsl_lpspi_unprepare_message().

Rather than doing this per message it's a bit better to do it
in prepare_transfer_hardware(), that way if there's a sequence
of messages queued one after another we don't turn the clock on
and off all the time.

Signed-off-by: default avatarGao Pan <pandy.gao@nxp.com>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent a17efbc5

drivers/spi/spi-fsl-lpspi.c

+4 −6
Original line number Diff line number Diff line
@@ -148,16 +148,14 @@ static void fsl_lpspi_intctrl(struct fsl_lpspi_data *fsl_lpspi, 
	writel(enable, fsl_lpspi->base + IMX7ULP_IER);

}



static int fsl_lpspi_prepare_message(struct spi_master *master,

				     struct spi_message *msg)

static int lpspi_prepare_xfer_hardware(struct spi_master *master)

{

	struct fsl_lpspi_data *fsl_lpspi = spi_master_get_devdata(master);



	return clk_prepare_enable(fsl_lpspi->clk);

}



static int

fsl_lpspi_unprepare_message(struct spi_master *master, struct spi_message *msg)

static int lpspi_unprepare_xfer_hardware(struct spi_master *master)

{

	struct fsl_lpspi_data *fsl_lpspi = spi_master_get_devdata(master);
@@ -438,8 +436,8 @@ static int fsl_lpspi_probe(struct platform_device *pdev) 
	fsl_lpspi->dev = &pdev->dev;



	master->transfer_one_message = fsl_lpspi_transfer_one_msg;

	master->prepare_message = fsl_lpspi_prepare_message;

	master->unprepare_message = fsl_lpspi_unprepare_message;

	master->prepare_transfer_hardware = lpspi_prepare_xfer_hardware;

	master->unprepare_transfer_hardware = lpspi_unprepare_xfer_hardware;

	master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH;

	master->flags = SPI_MASTER_MUST_RX | SPI_MASTER_MUST_TX;

	master->dev.of_node = pdev->dev.of_node;