Commit 7b983da3 authored by Ivan Bornyakov's avatar Ivan Bornyakov Committed by Shawn Guo
Browse files

bus: imx-weim: optionally enable continuous burst clock 



To enable continuous burst clock, add "fsl,continuous-burst-clk" along
with "fsl,burst-clk-enable" property to the weim bus's devicetree node.

Example:
weim: weim@21b8000 {
	compatible = "fsl,imx6ul-weim", "fsl,imx6q-weim";
	reg = <0x021b8000 0x4000>;
	clocks = <&clks 143>;
	#address-cells = <2>;
	#size-cells = <1>;
	ranges = <0 0 0x50000000 0x08000000>;
	fsl,weim-cs-gpr = <&gpr>;
	fsl,burst-clk-enable;
	fsl,continuous-burst-clk;

	client-device@0 {
		...
	};
};

Signed-off-by: default avatarIvan Bornyakov <i.bornyakov@metrotek.ru>
Reviewed-by: default avatarFabio Estevam <festevam@gmail.com>
Signed-off-by: default avatarShawn Guo <shawnguo@kernel.org>
parent 8361b8b2

drivers/bus/imx-weim.c

+16 −2
Original line number Diff line number Diff line
@@ -21,6 +21,7 @@ struct imx_weim_devtype { 
	unsigned int	cs_stride;

	unsigned int	wcr_offset;

	unsigned int	wcr_bcm;

	unsigned int	wcr_cont_bclk;

};



static const struct imx_weim_devtype imx1_weim_devtype = {
@@ -41,6 +42,7 @@ static const struct imx_weim_devtype imx50_weim_devtype = { 
	.cs_stride	= 0x18,

	.wcr_offset	= 0x90,

	.wcr_bcm	= BIT(0),

	.wcr_cont_bclk	= BIT(3),

};



static const struct imx_weim_devtype imx51_weim_devtype = {
@@ -206,8 +208,20 @@ static int weim_parse_dt(struct platform_device *pdev, void __iomem *base) 
	if (of_property_read_bool(pdev->dev.of_node, "fsl,burst-clk-enable")) {

		if (devtype->wcr_bcm) {

			reg = readl(base + devtype->wcr_offset);

			writel(reg | devtype->wcr_bcm,

				base + devtype->wcr_offset);

			reg |= devtype->wcr_bcm;



			if (of_property_read_bool(pdev->dev.of_node,

						"fsl,continuous-burst-clk")) {

				if (devtype->wcr_cont_bclk) {

					reg |= devtype->wcr_cont_bclk;

				} else {

					dev_err(&pdev->dev,

						"continuous burst clk not supported.\n");

					return -EINVAL;

				}

			}



			writel(reg, base + devtype->wcr_offset);

		} else {

			dev_err(&pdev->dev, "burst clk mode not supported.\n");

			return -EINVAL;