[PATCH 2/2] clk: qcom: add IPQ9574 interconnect clocks support

[Varadarajan Narayanan]

Unlike MSM platforms that manage NoC related clocks and scaling
from RPM, IPQ SoCs dont involve RPM in managing NoC related
clocks and there is no NoC scaling.

However, there is a requirement to enable some NoC interface
clocks for accessing the peripheral controllers present on
these NoCs.

Hence adding a minimalistic interconnect driver that can enable
the relevant clocks. This is similar to msm8996-cbf's usage of
icc-clk framework.

Signed-off-by: Varadarajan Narayanan <quic_varada@xxxxxxxxxxx>
---
 arch/arm64/boot/dts/qcom/ipq9574.dtsi |  2 +
 drivers/clk/qcom/gcc-ipq9574.c        | 75 ++++++++++++++++++++++++++-
 2 files changed, 76 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/boot/dts/qcom/ipq9574.dtsi b/arch/arm64/boot/dts/qcom/ipq9574.dtsi
index 7f2e5cbf3bbb..efffbd085715 100644
--- a/arch/arm64/boot/dts/qcom/ipq9574.dtsi
+++ b/arch/arm64/boot/dts/qcom/ipq9574.dtsi
@@ -11,6 +11,7 @@
 #include <dt-bindings/interrupt-controller/arm-gic.h>
 #include <dt-bindings/reset/qcom,ipq9574-gcc.h>
 #include <dt-bindings/thermal/thermal.h>
+#include <dt-bindings/interconnect/qcom,ipq9574.h>
 
 / {
 	interrupt-parent = <&intc>;
@@ -306,6 +307,7 @@ gcc: clock-controller@1800000 {
 			#clock-cells = <1>;
 			#reset-cells = <1>;
 			#power-domain-cells = <1>;
+			#interconnect-cells = <1>;
 		};
 
 		tcsr_mutex: hwlock@1905000 {
diff --git a/drivers/clk/qcom/gcc-ipq9574.c b/drivers/clk/qcom/gcc-ipq9574.c
index 0a3f846695b8..edbf223719e4 100644
--- a/drivers/clk/qcom/gcc-ipq9574.c
+++ b/drivers/clk/qcom/gcc-ipq9574.c
@@ -9,9 +9,16 @@
 #include <linux/of.h>
 #include <linux/platform_device.h>
 #include <linux/regmap.h>
+#if IS_ENABLED(CONFIG_INTERCONNECT)
+#include <linux/interconnect-clk.h>
+#include <linux/interconnect-provider.h>
+#endif
 
 #include <dt-bindings/clock/qcom,ipq9574-gcc.h>
 #include <dt-bindings/reset/qcom,ipq9574-gcc.h>
+#if IS_ENABLED(CONFIG_INTERCONNECT)
+#include <dt-bindings/interconnect/qcom,ipq9574.h>
+#endif
 
 #include "clk-alpha-pll.h"
 #include "clk-branch.h"
@@ -4301,6 +4308,35 @@ static const struct qcom_reset_map gcc_ipq9574_resets[] = {
 	[GCC_WCSS_Q6_TBU_BCR] = { 0x12054, 0 },
 };
 
+
+#if IS_ENABLED(CONFIG_INTERCONNECT)
+static struct icc_clk_data *icc_ipq9574;
+
+static int noc_clks[] = {
+	GCC_ANOC_PCIE0_1LANE_M_CLK,
+	GCC_SNOC_PCIE0_1LANE_S_CLK,
+	GCC_ANOC_PCIE1_1LANE_M_CLK,
+	GCC_SNOC_PCIE1_1LANE_S_CLK,
+	GCC_ANOC_PCIE2_2LANE_M_CLK,
+	GCC_SNOC_PCIE2_2LANE_S_CLK,
+	GCC_ANOC_PCIE3_2LANE_M_CLK,
+	GCC_SNOC_PCIE3_2LANE_S_CLK,
+	GCC_SNOC_USB_CLK,
+	GCC_ANOC_USB_AXI_CLK,
+	GCC_NSSNOC_NSSCC_CLK,
+	GCC_NSSNOC_SNOC_CLK,
+	GCC_NSSNOC_SNOC_1_CLK,
+	GCC_NSSNOC_PCNOC_1_CLK,
+	GCC_NSSNOC_QOSGEN_REF_CLK,
+	GCC_NSSNOC_TIMEOUT_REF_CLK,
+	GCC_NSSNOC_XO_DCD_CLK,
+	GCC_NSSNOC_ATB_CLK,
+	GCC_MEM_NOC_NSSNOC_CLK,
+	GCC_NSSNOC_MEMNOC_CLK,
+	GCC_NSSNOC_MEM_NOC_1_CLK,
+};
+#endif
+
 static const struct of_device_id gcc_ipq9574_match_table[] = {
 	{ .compatible = "qcom,ipq9574-gcc" },
 	{ }
@@ -4327,7 +4363,44 @@ static const struct qcom_cc_desc gcc_ipq9574_desc = {
 
 static int gcc_ipq9574_probe(struct platform_device *pdev)
 {
-	return qcom_cc_probe(pdev, &gcc_ipq9574_desc);
+	int ret = qcom_cc_probe(pdev, &gcc_ipq9574_desc);
+#if IS_ENABLED(CONFIG_INTERCONNECT)
+	struct icc_provider *provider;
+	struct icc_clk_data *icd;
+	int i;
+#endif
+
+	if (ret)
+		return dev_err_probe(&pdev->dev, ret, "%s failed\n", __func__);
+
+#if IS_ENABLED(CONFIG_INTERCONNECT)
+	icd = devm_kmalloc(&pdev->dev, ARRAY_SIZE(noc_clks) * sizeof(*icd),
+			   GFP_KERNEL);
+
+	if (IS_ERR_OR_NULL(icd))
+		return dev_err_probe(&pdev->dev, PTR_ERR(icd),
+				     "%s malloc failed\n", __func__);
+
+	icc_ipq9574 = icd;
+
+	for (i = 0; i < ARRAY_SIZE(noc_clks); i++, icd++) {
+		icd->clk = gcc_ipq9574_clks[noc_clks[i]]->hw.clk;
+		if (IS_ERR_OR_NULL(icd->clk)) {
+			dev_err(&pdev->dev, "%s: %d clock not found\n",
+				__func__, noc_clks[i]);
+			return -ENOENT;
+		}
+		icd->name = clk_hw_get_name(&gcc_ipq9574_clks[noc_clks[i]]->hw);
+	}
+
+	provider = icc_clk_register(&pdev->dev, IPQ_APPS_ID,
+				    ARRAY_SIZE(noc_clks), icc_ipq9574);
+	if (IS_ERR_OR_NULL(provider))
+		return dev_err_probe(&pdev->dev, PTR_ERR(provider),
+				     "%s: icc_clk_register failed\n", __func__);
+#endif
+
+	return 0;
 }
 
 static struct platform_driver gcc_ipq9574_driver = {
-- 
2.34.1