clk/qcom: add initial clock driver for ipq9574

Add initial set of clocks and resets for enabling U-Boot on ipq9574
based RDP platforms.

Reviewed-by: Caleb Connolly <caleb.connolly@linaro.org>
Signed-off-by: Varadarajan Narayanan <quic_varada@quicinc.com>
Link: https://lore.kernel.org/r/20250226064505.1178054-4-quic_varada@quicinc.com
Signed-off-by: Caleb Connolly <caleb.connolly@linaro.org>

drivers/clk/qcom/Kconfig

@@ -31,6 +31,14 @@ config CLK_QCOM_IPQ4019
 	  on the Snapdragon IPQ4019 SoC. This driver supports the clocks
 	  and resets exposed by the GCC hardware block.
 
+config CLK_QCOM_IPQ9574
+	bool "Qualcomm IPQ9574 GCC"
+	select CLK_QCOM
+	help
+	  Say Y here to enable support for the Global Clock Controller
+	  on the Snapdragon IPQ9574 SoC. This driver supports the clocks
+	  and resets exposed by the GCC hardware block.
+
 config CLK_QCOM_QCM2290
 	bool "Qualcomm QCM2290 GCC"
 	select CLK_QCOM

drivers/clk/qcom/Makefile

@@ -7,6 +7,7 @@ obj-$(CONFIG_CLK_QCOM_SDM845) += clock-sdm845.o
 obj-$(CONFIG_CLK_QCOM_APQ8016) += clock-apq8016.o
 obj-$(CONFIG_CLK_QCOM_APQ8096) += clock-apq8096.o
 obj-$(CONFIG_CLK_QCOM_IPQ4019) += clock-ipq4019.o
+obj-$(CONFIG_CLK_QCOM_IPQ9574) += clock-ipq9574.o
 obj-$(CONFIG_CLK_QCOM_QCM2290) += clock-qcm2290.o
 obj-$(CONFIG_CLK_QCOM_QCS404) += clock-qcs404.o
 obj-$(CONFIG_CLK_QCOM_SA8775P) += clock-sa8775p.o

drivers/clk/qcom/clock-ipq9574.c

@@ -0,0 +1,94 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Clock drivers for Qualcomm ipq9574
+ *
+ * (C) Copyright 2025 Linaro Ltd.
+ */
+
+#include <linux/types.h>
+#include <clk-uclass.h>
+#include <dm.h>
+#include <linux/delay.h>
+#include <asm/io.h>
+#include <linux/bug.h>
+#include <linux/bitops.h>
+#include <dt-bindings/clock/qcom,ipq9574-gcc.h>
+#include <dt-bindings/reset/qcom,ipq9574-gcc.h>
+
+#include "clock-qcom.h"
+
+#define GCC_BLSP1_AHB_CBCR			0x1004
+#define GCC_BLSP1_UART3_APPS_CMD_RCGR		0x402C
+#define GCC_BLSP1_UART3_APPS_CBCR		0x4054
+
+#define GCC_SDCC1_APPS_CBCR			0x3302C
+#define GCC_SDCC1_AHB_CBCR			0x33034
+#define GCC_SDCC1_APPS_CMD_RCGR			0x33004
+#define GCC_SDCC1_ICE_CORE_CBCR			0x33030
+
+static ulong ipq9574_set_rate(struct clk *clk, ulong rate)
+{
+	struct msm_clk_priv *priv = dev_get_priv(clk->dev);
+
+	switch (clk->id) {
+	case GCC_BLSP1_UART3_APPS_CLK:
+		clk_rcg_set_rate_mnd(priv->base, GCC_BLSP1_UART3_APPS_CMD_RCGR,
+				     0, 144, 15625, CFG_CLK_SRC_GPLL0, 16);
+		return rate;
+	case GCC_SDCC1_APPS_CLK:
+		clk_rcg_set_rate_mnd(priv->base, GCC_SDCC1_APPS_CMD_RCGR,
+				     11, 0, 0, CFG_CLK_SRC_GPLL2, 16);
+		return rate;
+	default:
+		return -EINVAL;
+	}
+}
+
+static const struct gate_clk ipq9574_clks[] = {
+	GATE_CLK(GCC_BLSP1_UART3_APPS_CLK,	 0x4054, 0x00000001),
+	GATE_CLK(GCC_BLSP1_AHB_CLK,		 0x1004, 0x00000001),
+	GATE_CLK(GCC_SDCC1_AHB_CLK,		0x33034, 0x00000001),
+	GATE_CLK(GCC_SDCC1_APPS_CLK,		0x3302C, 0x00000001),
+	GATE_CLK(GCC_SDCC1_ICE_CORE_CLK,	0x33030, 0x00000001),
+};
+
+static int ipq9574_enable(struct clk *clk)
+{
+	struct msm_clk_priv *priv = dev_get_priv(clk->dev);
+
+	debug("%s: clk %s\n", __func__, ipq9574_clks[clk->id].name);
+
+	if (!ipq9574_clks[clk->id].reg)
+		return -EINVAL;
+
+	qcom_gate_clk_en(priv, clk->id);
+
+	return 0;
+}
+
+static const struct qcom_reset_map ipq9574_gcc_resets[] = {
+	[GCC_SDCC_BCR] = { 0x33000 },
+};
+
+static struct msm_clk_data ipq9574_gcc_data = {
+	.resets = ipq9574_gcc_resets,
+	.num_resets = ARRAY_SIZE(ipq9574_gcc_resets),
+	.enable = ipq9574_enable,
+	.set_rate = ipq9574_set_rate,
+};
+
+static const struct udevice_id gcc_ipq9574_of_match[] = {
+	{
+		.compatible = "qcom,ipq9574-gcc",
+		.data = (ulong)&ipq9574_gcc_data,
+	},
+	{ }
+};
+
+U_BOOT_DRIVER(gcc_ipq9574) = {
+	.name		= "gcc_ipq9574",
+	.id		= UCLASS_NOP,
+	.of_match	= gcc_ipq9574_of_match,
+	.bind		= qcom_cc_bind,
+	.flags		= DM_FLAG_PRE_RELOC | DM_FLAG_DEFAULT_PD_CTRL_OFF,
+};

drivers/clk/qcom/clock-qcom.h

@@ -11,6 +11,7 @@
 #define CFG_CLK_SRC_CXO   (0 << 8)
 #define CFG_CLK_SRC_GPLL0 (1 << 8)
 #define CFG_CLK_SRC_GPLL0_AUX2 (2 << 8)
+#define CFG_CLK_SRC_GPLL2 (2 << 8)
 #define CFG_CLK_SRC_GPLL9 (2 << 8)
 #define CFG_CLK_SRC_GPLL0_ODD (3 << 8)
 #define CFG_CLK_SRC_GPLL6 (4 << 8)