clk: qcom: cbf-msm8996: scale CBF clock according to the CPUfreq

Turn CBF into the interconnect provider. Scale CBF frequency (bandwidth)
according to CPU frequencies.

Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Tested-by: Yassine Oudjana <y.oudjana@protonmail.com>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Acked-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230512001334.2983048-4-dmitry.baryshkov@linaro.org
Signed-off-by: Georgi Djakov <djakov@kernel.org>

drivers/clk/qcom/Kconfig

@@ -48,6 +48,7 @@ config QCOM_CLK_APCS_MSM8916
 config QCOM_CLK_APCC_MSM8996
 	tristate "MSM8996 CPU Clock Controller"
 	select QCOM_KRYO_L2_ACCESSORS
+	select INTERCONNECT_CLK if INTERCONNECT
 	depends on ARM64
 	help
 	  Support for the CPU clock controller on msm8996 devices.

drivers/clk/qcom/clk-cbf-8996.c

@@ -5,11 +5,15 @@
 #include <linux/bitfield.h>
 #include <linux/clk.h>
 #include <linux/clk-provider.h>
+#include <linux/interconnect-clk.h>
+#include <linux/interconnect-provider.h>
 #include <linux/of.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/regmap.h>
 
+#include <dt-bindings/interconnect/qcom,msm8996-cbf.h>
+
 #include "clk-alpha-pll.h"
 #include "clk-regmap.h"
 
@@ -223,6 +227,49 @@ static const struct regmap_config cbf_msm8996_regmap_config = {
 	.val_format_endian	= REGMAP_ENDIAN_LITTLE,
 };
 
+#ifdef CONFIG_INTERCONNECT
+
+/* Random ID that doesn't clash with main qnoc and OSM */
+#define CBF_MASTER_NODE 2000
+
+static int qcom_msm8996_cbf_icc_register(struct platform_device *pdev, struct clk_hw *cbf_hw)
+{
+	struct device *dev = &pdev->dev;
+	struct clk *clk = devm_clk_hw_get_clk(dev, cbf_hw, "cbf");
+	const struct icc_clk_data data[] = {
+		{ .clk = clk, .name = "cbf", },
+	};
+	struct icc_provider *provider;
+
+	provider = icc_clk_register(dev, CBF_MASTER_NODE, ARRAY_SIZE(data), data);
+	if (IS_ERR(provider))
+		return PTR_ERR(provider);
+
+	platform_set_drvdata(pdev, provider);
+
+	return 0;
+}
+
+static int qcom_msm8996_cbf_icc_remove(struct platform_device *pdev)
+{
+	struct icc_provider *provider = platform_get_drvdata(pdev);
+
+	icc_clk_unregister(provider);
+
+	return 0;
+}
+#define qcom_msm8996_cbf_icc_sync_state icc_sync_state
+#else
+static int qcom_msm8996_cbf_icc_register(struct platform_device *pdev,  struct clk_hw *cbf_hw)
+{
+	dev_warn(&pdev->dev, "CONFIG_INTERCONNECT is disabled, CBF clock is fixed\n");
+
+	return 0;
+}
+#define qcom_msm8996_cbf_icc_remove(pdev) (0)
+#define qcom_msm8996_cbf_icc_sync_state NULL
+#endif
+
 static int qcom_msm8996_cbf_probe(struct platform_device *pdev)
 {
 	void __iomem *base;
@@ -281,7 +328,16 @@ static int qcom_msm8996_cbf_probe(struct platform_device *pdev)
 	if (ret)
 		return ret;
 
-	return devm_of_clk_add_hw_provider(dev, of_clk_hw_simple_get, &cbf_mux.clkr.hw);
+	ret = devm_of_clk_add_hw_provider(dev, of_clk_hw_simple_get, &cbf_mux.clkr.hw);
+	if (ret)
+		return ret;
+
+	return qcom_msm8996_cbf_icc_register(pdev, &cbf_mux.clkr.hw);
+}
+
+static int qcom_msm8996_cbf_remove(struct platform_device *pdev)
+{
+	return qcom_msm8996_cbf_icc_remove(pdev);
 }
 
 static const struct of_device_id qcom_msm8996_cbf_match_table[] = {
@@ -292,9 +348,11 @@ MODULE_DEVICE_TABLE(of, qcom_msm8996_cbf_match_table);
 
 static struct platform_driver qcom_msm8996_cbf_driver = {
 	.probe = qcom_msm8996_cbf_probe,
+	.remove = qcom_msm8996_cbf_remove,
 	.driver = {
 		.name = "qcom-msm8996-cbf",
 		.of_match_table = qcom_msm8996_cbf_match_table,
+		.sync_state = qcom_msm8996_cbf_icc_sync_state,
 	},
 };