spi: dw: Add support for an optional interface clock

The Synopsys SSI Controller has an interface clock, but most SoCs hide
this away. However, on some SoCs you need to explicitly enable the
interface clock in order to access the registers. Therefore, add support
for an optional interface clock.

Signed-off-by: Phil Edworthy <phil.edworthy@renesas.com>
Signed-off-by: Gareth Williams <gareth.williams.jx@renesas.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/drivers/spi/spi-dw-mmio.c b/drivers/spi/spi-dw-mmio.c
index 4bd59a93d98868901e209c8c3ec97f72f91294f3..de952b17bc1069b0b1d017fd51beff9b307159f2 100644 (file)
--- a/drivers/spi/spi-dw-mmio.c
+++ b/drivers/spi/spi-dw-mmio.c
@@ -30,6 +30,7 @@
 struct dw_spi_mmio {
        struct dw_spi  dws;
        struct clk     *clk;
+       struct clk     *pclk;
        void           *priv;
 };
 
@@ -172,6 +173,14 @@ static int dw_spi_mmio_probe(struct platform_device *pdev)
        if (ret)
                return ret;
 
+       /* Optional clock needed to access the registers */
+       dwsmmio->pclk = devm_clk_get_optional(&pdev->dev, "pclk");
+       if (IS_ERR(dwsmmio->pclk))
+               return PTR_ERR(dwsmmio->pclk);
+       ret = clk_prepare_enable(dwsmmio->pclk);
+       if (ret)
+               goto out_clk;
+
        dws->bus_num = pdev->id;
 
        dws->max_freq = clk_get_rate(dwsmmio->clk);
@@ -199,6 +208,8 @@ static int dw_spi_mmio_probe(struct platform_device *pdev)
        return 0;
 
 out:
+       clk_disable_unprepare(dwsmmio->pclk);
+out_clk:
        clk_disable_unprepare(dwsmmio->clk);
        return ret;
 }
@@ -208,6 +219,7 @@ static int dw_spi_mmio_remove(struct platform_device *pdev)
        struct dw_spi_mmio *dwsmmio = platform_get_drvdata(pdev);
 
        dw_spi_remove_host(&dwsmmio->dws);
+       clk_disable_unprepare(dwsmmio->pclk);
        clk_disable_unprepare(dwsmmio->clk);
 
        return 0;