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path: root/drivers/clk/sunxi/clk-sun6i-apb0-gates.c
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Diffstat (limited to 'drivers/clk/sunxi/clk-sun6i-apb0-gates.c')
-rw-r--r--drivers/clk/sunxi/clk-sun6i-apb0-gates.c78
1 files changed, 45 insertions, 33 deletions
diff --git a/drivers/clk/sunxi/clk-sun6i-apb0-gates.c b/drivers/clk/sunxi/clk-sun6i-apb0-gates.c
index 44cd27c5c401..e10d0521ec76 100644
--- a/drivers/clk/sunxi/clk-sun6i-apb0-gates.c
+++ b/drivers/clk/sunxi/clk-sun6i-apb0-gates.c
@@ -9,81 +9,93 @@
*/
#include <linux/clk-provider.h>
+#include <linux/clkdev.h>
#include <linux/module.h>
#include <linux/of.h>
+#include <linux/of_device.h>
#include <linux/platform_device.h>
#define SUN6I_APB0_GATES_MAX_SIZE 32
+struct gates_data {
+ DECLARE_BITMAP(mask, SUN6I_APB0_GATES_MAX_SIZE);
+};
+
+static const struct gates_data sun6i_a31_apb0_gates __initconst = {
+ .mask = {0x7F},
+};
+
+static const struct gates_data sun8i_a23_apb0_gates __initconst = {
+ .mask = {0x5D},
+};
+
+static const struct of_device_id sun6i_a31_apb0_gates_clk_dt_ids[] = {
+ { .compatible = "allwinner,sun6i-a31-apb0-gates-clk", .data = &sun6i_a31_apb0_gates },
+ { .compatible = "allwinner,sun8i-a23-apb0-gates-clk", .data = &sun8i_a23_apb0_gates },
+ { /* sentinel */ }
+};
+
static int sun6i_a31_apb0_gates_clk_probe(struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;
struct clk_onecell_data *clk_data;
+ const struct of_device_id *device;
+ const struct gates_data *data;
const char *clk_parent;
const char *clk_name;
struct resource *r;
void __iomem *reg;
- int gate_id;
int ngates;
int i;
+ int j = 0;
+
+ if (!np)
+ return -ENODEV;
+
+ device = of_match_device(sun6i_a31_apb0_gates_clk_dt_ids, &pdev->dev);
+ if (!device)
+ return -ENODEV;
+ data = device->data;
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
reg = devm_ioremap_resource(&pdev->dev, r);
- if (!reg)
+ if (IS_ERR(reg))
return PTR_ERR(reg);
clk_parent = of_clk_get_parent_name(np, 0);
if (!clk_parent)
return -EINVAL;
- ngates = of_property_count_strings(np, "clock-output-names");
- if (ngates < 0)
- return ngates;
-
- if (!ngates || ngates > SUN6I_APB0_GATES_MAX_SIZE)
- return -EINVAL;
-
clk_data = devm_kzalloc(&pdev->dev, sizeof(struct clk_onecell_data),
GFP_KERNEL);
if (!clk_data)
return -ENOMEM;
- clk_data->clks = devm_kzalloc(&pdev->dev,
- SUN6I_APB0_GATES_MAX_SIZE *
- sizeof(struct clk *),
- GFP_KERNEL);
+ /* Worst-case size approximation and memory allocation */
+ ngates = find_last_bit(data->mask, SUN6I_APB0_GATES_MAX_SIZE);
+ clk_data->clks = devm_kcalloc(&pdev->dev, (ngates + 1),
+ sizeof(struct clk *), GFP_KERNEL);
if (!clk_data->clks)
return -ENOMEM;
- for (i = 0; i < ngates; i++) {
+ for_each_set_bit(i, data->mask, SUN6I_APB0_GATES_MAX_SIZE) {
of_property_read_string_index(np, "clock-output-names",
- i, &clk_name);
+ j, &clk_name);
- gate_id = i;
- of_property_read_u32_index(np, "clock-indices", i, &gate_id);
+ clk_data->clks[i] = clk_register_gate(&pdev->dev, clk_name,
+ clk_parent, 0, reg, i,
+ 0, NULL);
+ WARN_ON(IS_ERR(clk_data->clks[i]));
+ clk_register_clkdev(clk_data->clks[i], clk_name, NULL);
- WARN_ON(gate_id >= SUN6I_APB0_GATES_MAX_SIZE);
- if (gate_id >= SUN6I_APB0_GATES_MAX_SIZE)
- continue;
-
- clk_data->clks[gate_id] = clk_register_gate(&pdev->dev,
- clk_name,
- clk_parent, 0,
- reg, gate_id,
- 0, NULL);
- WARN_ON(IS_ERR(clk_data->clks[gate_id]));
+ j++;
}
- clk_data->clk_num = ngates;
+ clk_data->clk_num = ngates + 1;
return of_clk_add_provider(np, of_clk_src_onecell_get, clk_data);
}
-const struct of_device_id sun6i_a31_apb0_gates_clk_dt_ids[] = {
- { .compatible = "allwinner,sun6i-a31-apb0-gates-clk" },
- { /* sentinel */ }
-};
-
static struct platform_driver sun6i_a31_apb0_gates_clk_driver = {
.driver = {
.name = "sun6i-a31-apb0-gates-clk",