spi: dw: Add support for an optional interface clock (560ee7e9) · Commits · 戴 / test

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>

drivers/spi/spi-dw-mmio.c

+12 −0

Original line number	Diff line number	Diff line
		@@ -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;

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