[PATCH 4/4] clk: imx: imx8qxp-lpcg: add parsing clocks from device tree

[Aisheng Dong <aisheng.dong@nxp.com>]

Add parsing clocks from device tree.

Cc: Stephen Boyd <sboyd@kernel.org>
Cc: Shawn Guo <shawnguo@kernel.org>
Cc: Sascha Hauer <kernel@pengutronix.de>
Cc: Michael Turquette <mturquette@baylibre.com>
Signed-off-by: Dong Aisheng <aisheng.dong@nxp.com>
---
 drivers/clk/imx/clk-imx8qxp-lpcg.c | 90 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 90 insertions(+)

diff --git a/drivers/clk/imx/clk-imx8qxp-lpcg.c b/drivers/clk/imx/clk-imx8qxp-lpcg.c
index 99c2508..dbbd3bd 100644
--- a/drivers/clk/imx/clk-imx8qxp-lpcg.c
+++ b/drivers/clk/imx/clk-imx8qxp-lpcg.c
@@ -9,6 +9,7 @@
 #include <linux/io.h>
 #include <linux/module.h>
 #include <linux/of.h>
+#include <linux/of_address.h>
 #include <linux/of_device.h>
 #include <linux/platform_device.h>
 #include <linux/slab.h>
@@ -152,6 +153,88 @@ static const struct imx8qxp_ss_lpcg imx8qxp_ss_lsio = {
 	.num_max = IMX_LSIO_LPCG_CLK_END,
 };
 
+#define IMX_LPCG_MAX_CLKS	8
+
+static int imx_lpcg_parse_clks_from_dt(struct platform_device *pdev,
+				       struct device_node *np)
+{
+	const char *output_names[IMX_LPCG_MAX_CLKS];
+	const char *parent_names[IMX_LPCG_MAX_CLKS];
+	unsigned int bit_offset[IMX_LPCG_MAX_CLKS];
+	struct clk_hw_onecell_data *clk_data;
+	struct clk_hw **clk_hws;
+	struct resource *res;
+	void __iomem *base;
+	bool autogate;
+	int count;
+	int ret;
+	int i;
+
+	if (!of_device_is_compatible(np, "fsl,imx8qxp-lpcg"))
+		return -EINVAL;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	base = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(base))
+		return PTR_ERR(base);
+
+	count = of_property_count_u32_elems(np, "bit-offset");
+	if (count < 0) {
+		dev_err(&pdev->dev, "failed to count clocks\n");
+		return -EINVAL;
+	}
+
+	clk_data = devm_kzalloc(&pdev->dev, struct_size(clk_data, hws, count),
+				GFP_KERNEL);
+	if (!clk_data)
+		return -ENOMEM;
+
+	clk_data->num = count;
+	clk_hws = clk_data->hws;
+
+	ret = of_property_read_u32_array(np, "bit-offset", bit_offset,
+					 clk_data->num);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "failed to read clocks bit-offset\n");
+		return -EINVAL;
+	}
+
+	ret = of_clk_parent_fill(np, parent_names, clk_data->num);
+	if (ret != clk_data->num) {
+		dev_err(&pdev->dev, "failed to get clock parent names\n");
+		return -EINVAL;
+	}
+
+	ret = of_property_read_string_array(np, "clock-output-names",
+					    output_names, clk_data->num);
+	if (ret != clk_data->num) {
+		dev_err(&pdev->dev, "failed to read clock-output-names\n");
+		return -EINVAL;
+	}
+
+	autogate = of_property_read_bool(np, "hw-autogate");
+
+	for (i = 0; i < clk_data->num; i++) {
+		if (bit_offset[i] > 31) {
+			dev_warn(&pdev->dev, "invalid bit offset of clock %d\n",
+				 i);
+			return -EINVAL;
+		}
+
+		clk_hws[i] = imx_clk_lpcg_scu(output_names[i],
+					      parent_names[i], 0, base,
+					      bit_offset[i], autogate);
+		if (IS_ERR(clk_hws[i])) {
+			dev_warn(&pdev->dev, "failed to register clock %d\n",
+				 i);
+			return -EINVAL;
+		}
+	}
+
+	return devm_of_clk_add_hw_provider(&pdev->dev, of_clk_hw_onecell_get,
+					   clk_data);
+}
+
 static int imx8qxp_lpcg_clk_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
@@ -162,8 +245,14 @@ static int imx8qxp_lpcg_clk_probe(struct platform_device *pdev)
 	struct resource *res;
 	struct clk_hw **clks;
 	void __iomem *base;
+	int ret;
 	int i;
 
+	/* try new binding to parse clocks from device tree first */
+	ret = imx_lpcg_parse_clks_from_dt(pdev, np);
+	if (!ret)
+		return 0;
+
 	ss_lpcg = of_device_get_match_data(dev);
 	if (!ss_lpcg)
 		return -ENODEV;
@@ -201,6 +290,7 @@ static const struct of_device_id imx8qxp_lpcg_match[] = {
 	{ .compatible = "fsl,imx8qxp-lpcg-adma", &imx8qxp_ss_adma, },
 	{ .compatible = "fsl,imx8qxp-lpcg-conn", &imx8qxp_ss_conn, },
 	{ .compatible = "fsl,imx8qxp-lpcg-lsio", &imx8qxp_ss_lsio, },
+	{ .compatible = "fsl,imx8qxp-lpcg", NULL },
 	{ /* sentinel */ }
 };
 
-- 
2.7.4