linux-kernel - [PATCH v3 1/2] bus: imx-weim: optionally enable continuous burst clock

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Message-Id: <20211202055724.4416-2-i.bornyakov@metrotek.ru>
Date:   Thu,  2 Dec 2021 08:57:23 +0300
From:   Ivan Bornyakov <i.bornyakov@...rotek.ru>
To:     unlisted-recipients:; (no To-header on input)
Cc:     Ivan Bornyakov <i.bornyakov@...rotek.ru>, system@...rotek.ru,
        shawnguo@...nel.org, s.hauer@...gutronix.de, kernel@...gutronix.de,
        festevam@...il.com, linux-imx@....com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        robh+dt@...nel.org, devicetree@...r.kernel.org
Subject: [PATCH v3 1/2] 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@...8000 {
	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: Ivan Bornyakov <i.bornyakov@...rotek.ru>
---
 drivers/bus/imx-weim.c | 18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

diff --git a/drivers/bus/imx-weim.c b/drivers/bus/imx-weim.c
index 28bb65a5613f..bccb275b65ba 100644
--- a/drivers/bus/imx-weim.c
+++ b/drivers/bus/imx-weim.c
@@ -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;
-- 
2.32.0