clk: sunxi-ng: Convert early providers to platform drivers

The PRCM CCU drivers depend on clocks provided by other CCU drivers. For
example, the sun8i-r-ccu driver uses the "pll-periph" clock provided by
the SoC's main CCU.

However, sun8i-r-ccu is an early OF clock provider, and many of the
main CCUs (e.g. sun50i-a64-ccu) use platform drivers. This means that
the consumer clocks will be orphaned until the supplier driver is bound.
This can be avoided by converting the remaining CCUs to use platform
drivers. Then fw_devlink will ensure the drivers are bound in the
optimal order.

The sun5i CCU is the only one which actually needs to be an early clock
provider, because it provides the clock for the system timer. That one
is left alone.

Signed-off-by: Samuel Holland <samuel@sholland.org>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://lore.kernel.org/r/20211119033338.25486-4-samuel@sholland.org

1 files changed, 25 insertions, 10 deletions

diff --git a/drivers/clk/sunxi-ng/ccu-sun8i-a23.c b/drivers/clk/sunxi-ng/ccu-sun8i-a23.c
index 577bb235d658..e80cc3864e44 100644
--- a/drivers/clk/sunxi-ng/ccu-sun8i-a23.c
+++ b/drivers/clk/sunxi-ng/ccu-sun8i-a23.c
@@ -5,7 +5,8 @@
 
 #include <linux/clk-provider.h>
 #include <linux/io.h>
-#include <linux/of_address.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
 
 #include "ccu_common.h"
 #include "ccu_reset.h"
@@ -724,16 +725,14 @@ static const struct sunxi_ccu_desc sun8i_a23_ccu_desc = {
 	.num_resets	= ARRAY_SIZE(sun8i_a23_ccu_resets),
 };
 
-static void __init sun8i_a23_ccu_setup(struct device_node *node)
+static int sun8i_a23_ccu_probe(struct platform_device *pdev)
 {
 	void __iomem *reg;
 	u32 val;
 
-	reg = of_io_request_and_map(node, 0, of_node_full_name(node));
-	if (IS_ERR(reg)) {
-		pr_err("%pOF: Could not map the clock registers\n", node);
-		return;
-	}
+	reg = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(reg))
+		return PTR_ERR(reg);
 
 	/* Force the PLL-Audio-1x divider to 1 */
 	val = readl(reg + SUN8I_A23_PLL_AUDIO_REG);
@@ -745,7 +744,23 @@ static void __init sun8i_a23_ccu_setup(struct device_node *node)
 	val &= ~BIT(16);
 	writel(val, reg + SUN8I_A23_PLL_MIPI_REG);
 
-	of_sunxi_ccu_probe(node, reg, &sun8i_a23_ccu_desc);
+	return devm_sunxi_ccu_probe(&pdev->dev, reg, &sun8i_a23_ccu_desc);
 }
-CLK_OF_DECLARE(sun8i_a23_ccu, "allwinner,sun8i-a23-ccu",
-	       sun8i_a23_ccu_setup);
+
+static const struct of_device_id sun8i_a23_ccu_ids[] = {
+	{ .compatible = "allwinner,sun8i-a23-ccu" },
+	{ }
+};
+
+static struct platform_driver sun8i_a23_ccu_driver = {
+	.probe	= sun8i_a23_ccu_probe,
+	.driver	= {
+		.name			= "sun8i-a23-ccu",
+		.suppress_bind_attrs	= true,
+		.of_match_table		= sun8i_a23_ccu_ids,
+	},
+};
+module_platform_driver(sun8i_a23_ccu_driver);
+
+MODULE_IMPORT_NS(SUNXI_CCU);
+MODULE_LICENSE("GPL");