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Commit 9e556dcc authored by Huang Shijie's avatar Huang Shijie Committed by Mark Brown
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spi: spi-imx: only enable the clocks when we start to transfer a message 



Current code keeps the clocks enabled all the time, it wastes the power
when there is no operaiton on the spi controller.

In order to save the power, this patch adds the two hooks:
   spi_imx_prepare_message: enable the clocks for this message
   spi_imx_unprepare_message: disable the clocks.

This patch also disables the clocks in the end of the probe.

Signed-off-by: default avatarHuang Shijie <b32955@freescale.com>
Signed-off-by: default avatarMark Brown <broonie@linaro.org>
parent 31d141e3

drivers/spi/spi-imx.c

+33 −0
Original line number Diff line number Diff line
@@ -749,6 +749,35 @@ static void spi_imx_cleanup(struct spi_device *spi) 
{

}



static int

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

{

	struct spi_imx_data *spi_imx = spi_master_get_devdata(master);

	int ret;



	ret = clk_enable(spi_imx->clk_per);

	if (ret)

		return ret;



	ret = clk_enable(spi_imx->clk_ipg);

	if (ret) {

		clk_disable(spi_imx->clk_per);

		return ret;

	}



	return 0;

}



static int

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

{

	struct spi_imx_data *spi_imx = spi_master_get_devdata(master);



	clk_disable(spi_imx->clk_ipg);

	clk_disable(spi_imx->clk_per);

	return 0;

}



static int spi_imx_probe(struct platform_device *pdev)

{

	struct device_node *np = pdev->dev.of_node;
@@ -810,6 +839,8 @@ static int spi_imx_probe(struct platform_device *pdev) 
	spi_imx->bitbang.txrx_bufs = spi_imx_transfer;

	spi_imx->bitbang.master->setup = spi_imx_setup;

	spi_imx->bitbang.master->cleanup = spi_imx_cleanup;

	spi_imx->bitbang.master->prepare_message = spi_imx_prepare_message;

	spi_imx->bitbang.master->unprepare_message = spi_imx_unprepare_message;

	spi_imx->bitbang.master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH;



	init_completion(&spi_imx->xfer_done);
@@ -872,6 +903,8 @@ static int spi_imx_probe(struct platform_device *pdev) 


	dev_info(&pdev->dev, "probed\n");



	clk_disable(spi_imx->clk_ipg);

	clk_disable(spi_imx->clk_per);

	return ret;



out_clk_put: