On sun6i, the gmac clock is handled by the dwmac-sunxi driver, but
its configuration register is located in the CCU register range,
requiring proper regmap setup.
In order to do that, we use CLK_OF_DECLARE_DRIVER to initialize
sun7i ccu, which clears the OF_POPULATED flag, allowing the
platform device to probe the same resource with device node.
Signed-off-by: Priit Laes <plaes@xxxxxxxxx>
---
drivers/clk/sunxi-ng/ccu-sun6i-a31.c | 62 +++++++++++++++++++++++++++-
1 file changed, 60 insertions(+), 2 deletions(-)
diff --git a/drivers/clk/sunxi-ng/ccu-sun6i-a31.c b/drivers/clk/sunxi-ng/ccu-sun6i-a31.c
index 9b40d53266a3..3f6f9824b2ca 100644
--- a/drivers/clk/sunxi-ng/ccu-sun6i-a31.c
+++ b/drivers/clk/sunxi-ng/ccu-sun6i-a31.c
@@ -10,6 +10,8 @@
#include <linux/clk-provider.h>
#include <linux/io.h>
#include <linux/of_address.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
#include "ccu_common.h"
#include "ccu_reset.h"
@@ -1262,5 +1264,61 @@ static void __init sun6i_a31_ccu_setup(struct device_node *node)
ccu_mux_notifier_register(pll_cpu_clk.common.hw.clk,
&sun6i_a31_cpu_nb);
}
-CLK_OF_DECLARE(sun6i_a31_ccu, "allwinner,sun6i-a31-ccu",
- sun6i_a31_ccu_setup);
+CLK_OF_DECLARE_DRIVER(sun6i_a31_ccu, "allwinner,sun6i-a31-ccu",
+ sun6i_a31_ccu_setup);
+
+/*
+ * Regmap for the GMAC driver (dwmac-sunxi) to allow access to
+ * GMAC configuration register.
+ */
+#define SUN6I_A31_GMAC_CFG_REG 0xD0
+static bool sun6i_a31_ccu_regmap_accessible_reg(struct device *dev,
+ unsigned int reg)
+{
+ if (reg == SUN6I_A31_GMAC_CFG_REG)
+ return true;
+ return false;
+}
+
+static struct regmap_config sun6i_a31_ccu_regmap_config = {
+ .reg_bits = 32,
+ .val_bits = 32,
+ .reg_stride = 4,
+ .max_register = 0x308, /* clk_out_b */
+
+ .readable_reg = sun6i_a31_ccu_regmap_accessible_reg,
+ .writeable_reg = sun6i_a31_ccu_regmap_accessible_reg,
+};
+
+static int sun6i_a31_ccu_probe_regmap(struct platform_device *pdev)
+{
+ void __iomem *reg;
+ struct resource *res;
+ struct regmap *regmap;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ reg = devm_ioremap(&pdev->dev, res->start, resource_size(res));
+ if (IS_ERR(reg))
+ return PTR_ERR(reg);
+
+ regmap = devm_regmap_init_mmio(&pdev->dev, reg,
+ &sun6i_a31_ccu_regmap_config);
+ if (IS_ERR(regmap))
+ return PTR_ERR(regmap);
+
+ return 0;
+}
+
+static const struct of_device_id sun6i_a31_ccu_ids[] = {
+ { .compatible = "allwinner,sun6i-a31-ccu"},
+ { }
+};
+
+static struct platform_driver sun6i_a31_ccu_driver = {
+ .probe = sun6i_a31_ccu_probe_regmap,
+ .driver = {
+ .name = "sun6i-a31-ccu",
+ .of_match_table = sun6i_a31_ccu_ids,
+ },
+};
+builtin_platform_driver(sun6i_a31_ccu_driver);
--
2.26.2
