1 files changed, 92 insertions, 0 deletions
diff --git a/drivers/clk/clk-fsl-sai.c b/drivers/clk/clk-fsl-sai.c
new file mode 100644
index 000000000..6238fcea0
--- /dev/null
+++ b/drivers/clk/clk-fsl-sai.c
@@ -0,0 +1,92 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Freescale SAI BCLK as a generic clock driver
+ *
+ * Copyright 2020 Michael Walle <michael@walle.cc>
+ */
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/clk-provider.h>
+#include <linux/err.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/slab.h>
+
+#define I2S_CSR		0x00
+#define I2S_CR2		0x08
+#define CSR_BCE_BIT	28
+#define CR2_BCD		BIT(24)
+#define CR2_DIV_SHIFT	0
+#define CR2_DIV_WIDTH	8
+
+struct fsl_sai_clk {
+	struct clk_divider div;
+	struct clk_gate gate;
+	spinlock_t lock;
+};
+
+static int fsl_sai_clk_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct fsl_sai_clk *sai_clk;
+	struct clk_parent_data pdata = { .index = 0 };
+	void __iomem *base;
+	struct clk_hw *hw;
+	struct resource *res;
+
+	sai_clk = devm_kzalloc(dev, sizeof(*sai_clk), GFP_KERNEL);
+	if (!sai_clk)
+		return -ENOMEM;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	base = devm_ioremap_resource(dev, res);
+	if (IS_ERR(base))
+		return PTR_ERR(base);
+
+	spin_lock_init(&sai_clk->lock);
+
+	sai_clk->gate.reg = base + I2S_CSR;
+	sai_clk->gate.bit_idx = CSR_BCE_BIT;
+	sai_clk->gate.lock = &sai_clk->lock;
+
+	sai_clk->div.reg = base + I2S_CR2;
+	sai_clk->div.shift = CR2_DIV_SHIFT;
+	sai_clk->div.width = CR2_DIV_WIDTH;
+	sai_clk->div.lock = &sai_clk->lock;
+
+	/* set clock direction, we are the BCLK master */
+	writel(CR2_BCD, base + I2S_CR2);
+
+	hw = devm_clk_hw_register_composite_pdata(dev, dev->of_node->name,
+						  &pdata, 1, NULL, NULL,
+						  &sai_clk->div.hw,
+						  &clk_divider_ops,
+						  &sai_clk->gate.hw,
+						  &clk_gate_ops,
+						  CLK_SET_RATE_GATE);
+	if (IS_ERR(hw))
+		return PTR_ERR(hw);
+
+	return devm_of_clk_add_hw_provider(dev, of_clk_hw_simple_get, hw);
+}
+
+static const struct of_device_id of_fsl_sai_clk_ids[] = {
+	{ .compatible = "fsl,vf610-sai-clock" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, of_fsl_sai_clk_ids);
+
+static struct platform_driver fsl_sai_clk_driver = {
+	.probe = fsl_sai_clk_probe,
+	.driver		= {
+		.name	= "fsl-sai-clk",
+		.of_match_table = of_fsl_sai_clk_ids,
+	},
+};
+module_platform_driver(fsl_sai_clk_driver);
+
+MODULE_DESCRIPTION("Freescale SAI bitclock-as-a-clock driver");
+MODULE_AUTHOR("Michael Walle <michael@walle.cc>");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:fsl-sai-clk");