linux-kernel - [PATCH 3/5] clk: qcom: Add lpass clock controller driver for SC8280XP

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Message-Id: <20230518113800.339158-4-srinivas.kandagatla@linaro.org>
Date:   Thu, 18 May 2023 12:37:58 +0100
From:   Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To:     andersson@...nel.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org
Cc:     johan+linaro@...nel.org, agross@...nel.org,
        konrad.dybcio@...aro.org, mturquette@...libre.com,
        sboyd@...nel.org, conor+dt@...nel.org,
        linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Subject: [PATCH 3/5] clk: qcom: Add lpass clock controller driver for SC8280XP

Add support for the lpass clock controller found on SC8280XP based devices.
This would allow lpass peripheral loader drivers to control the clocks and
bring the subsystems out of reset.

Currently this patch only supports resets as the Q6DSP is in control of
LPASS IP which manages most of the clocks via Q6PRM service on GPR rpmsg
channel.

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
---
 drivers/clk/qcom/Kconfig            |  8 ++++
 drivers/clk/qcom/Makefile           |  1 +
 drivers/clk/qcom/lpasscc-sc8280xp.c | 71 +++++++++++++++++++++++++++++
 3 files changed, 80 insertions(+)
 create mode 100644 drivers/clk/qcom/lpasscc-sc8280xp.c

diff --git a/drivers/clk/qcom/Kconfig b/drivers/clk/qcom/Kconfig
index 12be3e2371b3..8188f4dedf40 100644
--- a/drivers/clk/qcom/Kconfig
+++ b/drivers/clk/qcom/Kconfig
@@ -514,6 +514,14 @@ config SC_GPUCC_8280XP
 	  Say Y if you want to support graphics controller devices and
 	  functionality such as 3D graphics.
 
+config SC_LPASSCC_8280XP
+	tristate "SC8280 Low Power Audio Subsystem (LPASS) Clock Controller"
+	select SC_GCC_8280XP
+	help
+	  Support for the LPASS clock controller on SC8280XP devices.
+	  Say Y if you want to use the LPASS branch clocks of the LPASS clock
+	  controller to reset the LPASS subsystem.
+
 config SC_LPASSCC_7280
 	tristate "SC7280 Low Power Audio Subsystem (LPASS) Clock Controller"
 	select SC_GCC_7280
diff --git a/drivers/clk/qcom/Makefile b/drivers/clk/qcom/Makefile
index 9ff4c373ad95..dce2dd639524 100644
--- a/drivers/clk/qcom/Makefile
+++ b/drivers/clk/qcom/Makefile
@@ -71,6 +71,7 @@ obj-$(CONFIG_SC_CAMCC_7280) += camcc-sc7280.o
 obj-$(CONFIG_SC_DISPCC_7180) += dispcc-sc7180.o
 obj-$(CONFIG_SC_DISPCC_7280) += dispcc-sc7280.o
 obj-$(CONFIG_SC_DISPCC_8280XP) += dispcc-sc8280xp.o
+obj-$(CONFIG_SC_LPASSCC_8280XP) += lpasscc-sc8280xp.o
 obj-$(CONFIG_SA_GCC_8775P) += gcc-sa8775p.o
 obj-$(CONFIG_SA_GPUCC_8775P) += gpucc-sa8775p.o
 obj-$(CONFIG_SC_GCC_7180) += gcc-sc7180.o
diff --git a/drivers/clk/qcom/lpasscc-sc8280xp.c b/drivers/clk/qcom/lpasscc-sc8280xp.c
new file mode 100644
index 000000000000..118320f8ee40
--- /dev/null
+++ b/drivers/clk/qcom/lpasscc-sc8280xp.c
@@ -0,0 +1,71 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2022, Linaro Limited
+ */
+
+#include <linux/clk-provider.h>
+#include <linux/err.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/regmap.h>
+#include <dt-bindings/clock/qcom,lpasscc-sc8280xp.h>
+#include "common.h"
+#include "reset.h"
+
+static const struct qcom_reset_map lpass_tcsr_sc8280xp_resets[] = {
+	[LPASS_AUDIO_SWR_TX_CGCR] = { 0xc010, 1 },
+};
+
+static struct regmap_config lpass_tcsr_sc8280xp_regmap_config = {
+	.reg_bits = 32,
+	.reg_stride = 4,
+	.val_bits = 32,
+	.name = "lpass-tcsr",
+	.max_register = 0x12000,
+};
+
+static const struct qcom_cc_desc lpass_tcsr_reset_sc8280xp_desc = {
+	.config = &lpass_tcsr_sc8280xp_regmap_config,
+	.resets = lpass_tcsr_sc8280xp_resets,
+	.num_resets = ARRAY_SIZE(lpass_tcsr_sc8280xp_resets),
+};
+
+static const struct of_device_id lpasscc_sc8280xp_match_table[] = {
+	{
+		.compatible = "qcom,sc8280xp-lpasscc",
+		.data = &lpass_tcsr_reset_sc8280xp_desc,
+	},
+	{ }
+};
+MODULE_DEVICE_TABLE(of, lpasscc_sc8280xp_match_table);
+
+static int lpasscc_sc8280xp_probe(struct platform_device *pdev)
+{
+	const struct qcom_cc_desc *desc = of_device_get_match_data(&pdev->dev);
+
+	return qcom_cc_probe_by_index(pdev, 0, desc);
+}
+
+static struct platform_driver lpasscc_sc8280xp_driver = {
+	.probe = lpasscc_sc8280xp_probe,
+	.driver = {
+		.name = "lpasscc-sc8280xp",
+		.of_match_table = lpasscc_sc8280xp_match_table,
+	},
+};
+
+static int __init lpasscc_sc8280xp_init(void)
+{
+	return platform_driver_register(&lpasscc_sc8280xp_driver);
+}
+subsys_initcall(lpasscc_sc8280xp_init);
+
+static void __exit lpasscc_sc8280xp_exit(void)
+{
+	platform_driver_unregister(&lpasscc_sc8280xp_driver);
+}
+module_exit(lpasscc_sc8280xp_exit);
+
+MODULE_DESCRIPTION("QTI LPASSCC SC8280XP Driver");
+MODULE_LICENSE("GPL");
-- 
2.25.1