From: Laurentiu Mihalcea <laurentiumihalcea111@gmail.com>
To: Rob Herring <robh@kernel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
Conor Dooley <conor+dt@kernel.org>, Lee Jones <lee@kernel.org>,
Shawn Guo <shawnguo@kernel.org>,
Philipp Zabel <p.zabel@pengutronix.de>,
Liu Ying <victor.liu@nxp.com>,
Sascha Hauer <s.hauer@pengutronix.de>
Cc: laurentiu.mihalcea@nxp.com, devicetree@vger.kernel.org,
imx@lists.linux.dev, linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org
Subject: [PATCH 2/4] reset: add driver for imx8ulp SIM reset controller
Date: Thu, 16 May 2024 23:40:29 +0300 [thread overview]
Message-ID: <20240516204031.171920-3-laurentiumihalcea111@gmail.com> (raw)
In-Reply-To: <20240516204031.171920-1-laurentiumihalcea111@gmail.com>
From: Laurentiu Mihalcea <laurentiu.mihalcea@nxp.com>
Certain components can be reset via the SIM module.
Add reset controller driver for the SIM module to
allow drivers for said components to control the
reset signal(s).
Signed-off-by: Liu Ying <victor.liu@nxp.com>
Signed-off-by: Laurentiu Mihalcea <laurentiu.mihalcea@nxp.com>
---
drivers/reset/Kconfig | 7 ++
drivers/reset/Makefile | 1 +
drivers/reset/reset-imx8ulp-sim.c | 98 +++++++++++++++++++
include/dt-bindings/reset/imx8ulp-sim-reset.h | 16 +++
4 files changed, 122 insertions(+)
create mode 100644 drivers/reset/reset-imx8ulp-sim.c
create mode 100644 include/dt-bindings/reset/imx8ulp-sim-reset.h
diff --git a/drivers/reset/Kconfig b/drivers/reset/Kconfig
index 85b27c42cf65..c1f4d9ebd0fd 100644
--- a/drivers/reset/Kconfig
+++ b/drivers/reset/Kconfig
@@ -91,6 +91,13 @@ config RESET_IMX7
help
This enables the reset controller driver for i.MX7 SoCs.
+config RESET_IMX8ULP_SIM
+ tristate "i.MX8ULP SIM Reset Driver"
+ depends on ARCH_MXC
+ help
+ This enables the SIM (System Integration Module) reset driver
+ for the i.MX8ULP SoC.
+
config RESET_INTEL_GW
bool "Intel Reset Controller Driver"
depends on X86 || COMPILE_TEST
diff --git a/drivers/reset/Makefile b/drivers/reset/Makefile
index fd8b49fa46fc..f257d6a41f1e 100644
--- a/drivers/reset/Makefile
+++ b/drivers/reset/Makefile
@@ -42,3 +42,4 @@ obj-$(CONFIG_RESET_UNIPHIER) += reset-uniphier.o
obj-$(CONFIG_RESET_UNIPHIER_GLUE) += reset-uniphier-glue.o
obj-$(CONFIG_RESET_ZYNQ) += reset-zynq.o
obj-$(CONFIG_ARCH_ZYNQMP) += reset-zynqmp.o
+obj-$(CONFIG_RESET_IMX8ULP_SIM) += reset-imx8ulp-sim.o
diff --git a/drivers/reset/reset-imx8ulp-sim.c b/drivers/reset/reset-imx8ulp-sim.c
new file mode 100644
index 000000000000..27923b9cd454
--- /dev/null
+++ b/drivers/reset/reset-imx8ulp-sim.c
@@ -0,0 +1,98 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+/*
+ * Copyright 2024 NXP
+ */
+
+#include <linux/mfd/syscon.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/reset-controller.h>
+#include <dt-bindings/reset/imx8ulp-sim-reset.h>
+
+#define AVD_SIM_SYSCTRL0 0x8
+
+struct imx8ulp_sim_reset {
+ struct reset_controller_dev rcdev;
+ struct regmap *regmap;
+};
+
+static const u32 imx8ulp_sim_reset_bits[IMX8ULP_SIM_RESET_NUM] = {
+ [IMX8ULP_SIM_RESET_MIPI_DSI_RST_DPI_N] = BIT(3),
+ [IMX8ULP_SIM_RESET_MIPI_DSI_RST_ESC_N] = BIT(4),
+ [IMX8ULP_SIM_RESET_MIPI_DSI_RST_BYTE_N] = BIT(5),
+};
+
+static inline struct imx8ulp_sim_reset *
+to_imx8ulp_sim_reset(struct reset_controller_dev *rcdev)
+{
+ return container_of(rcdev, struct imx8ulp_sim_reset, rcdev);
+}
+
+static int imx8ulp_sim_reset_assert(struct reset_controller_dev *rcdev,
+ unsigned long id)
+{
+ struct imx8ulp_sim_reset *simr = to_imx8ulp_sim_reset(rcdev);
+ const u32 bit = imx8ulp_sim_reset_bits[id];
+
+ return regmap_update_bits(simr->regmap, AVD_SIM_SYSCTRL0, bit, 0);
+}
+
+static int imx8ulp_sim_reset_deassert(struct reset_controller_dev *rcdev,
+ unsigned long id)
+{
+ struct imx8ulp_sim_reset *simr = to_imx8ulp_sim_reset(rcdev);
+ const u32 bit = imx8ulp_sim_reset_bits[id];
+
+ return regmap_update_bits(simr->regmap, AVD_SIM_SYSCTRL0, bit, bit);
+}
+
+static const struct reset_control_ops imx8ulp_sim_reset_ops = {
+ .assert = imx8ulp_sim_reset_assert,
+ .deassert = imx8ulp_sim_reset_deassert,
+};
+
+static const struct of_device_id imx8ulp_sim_reset_dt_ids[] = {
+ { .compatible = "nxp,imx8ulp-avd-sim-reset", },
+ { /* sentinel */ },
+};
+
+static int imx8ulp_sim_reset_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct imx8ulp_sim_reset *simr;
+ int ret;
+
+ simr = devm_kzalloc(dev, sizeof(*simr), GFP_KERNEL);
+ if (!simr)
+ return -ENOMEM;
+
+ simr->regmap = syscon_node_to_regmap(dev->of_node->parent);
+ if (IS_ERR(simr->regmap)) {
+ ret = PTR_ERR(simr->regmap);
+ dev_err(dev, "failed to get regmap: %d\n", ret);
+ return ret;
+ }
+
+ simr->rcdev.owner = THIS_MODULE;
+ simr->rcdev.nr_resets = IMX8ULP_SIM_RESET_NUM;
+ simr->rcdev.ops = &imx8ulp_sim_reset_ops;
+ simr->rcdev.of_node = dev->of_node;
+
+ return devm_reset_controller_register(dev, &simr->rcdev);
+}
+
+static struct platform_driver imx8ulp_sim_reset_driver = {
+ .probe = imx8ulp_sim_reset_probe,
+ .driver = {
+ .name = KBUILD_MODNAME,
+ .of_match_table = imx8ulp_sim_reset_dt_ids,
+ },
+};
+module_platform_driver(imx8ulp_sim_reset_driver);
+
+MODULE_AUTHOR("Liu Ying <victor.liu@nxp.com>");
+MODULE_DESCRIPTION("NXP i.MX8ULP System Integration Module Reset driver");
+MODULE_LICENSE("GPL");
diff --git a/include/dt-bindings/reset/imx8ulp-sim-reset.h b/include/dt-bindings/reset/imx8ulp-sim-reset.h
new file mode 100644
index 000000000000..a3cee0d60773
--- /dev/null
+++ b/include/dt-bindings/reset/imx8ulp-sim-reset.h
@@ -0,0 +1,16 @@
+/* SPDX-License-Identifier: GPL-2.0-only OR BSD-3-Clause */
+
+/*
+ * Copyright 2024 NXP
+ */
+
+#ifndef DT_BINDINGS_RESET_IMX8ULP_SIM_RESET_H
+#define DT_BINDINGS_RESET_IMX8ULP_SIM_RESET_H
+
+#define IMX8ULP_SIM_RESET_MIPI_DSI_RST_DPI_N 0
+#define IMX8ULP_SIM_RESET_MIPI_DSI_RST_ESC_N 1
+#define IMX8ULP_SIM_RESET_MIPI_DSI_RST_BYTE_N 2
+
+#define IMX8ULP_SIM_RESET_NUM 3
+
+#endif /* DT_BINDINGS_RESET_IMX8ULP_SIM_RESET_H */
--
2.34.1
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next prev parent reply other threads:[~2024-05-16 20:41 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-05-16 20:40 [PATCH 0/4] Add support for imx8ulp's SIM Laurentiu Mihalcea
2024-05-16 20:40 ` [PATCH 1/4] dt-bindings: reset: add schema for imx8ulp SIM reset Laurentiu Mihalcea
2024-05-16 21:22 ` Rob Herring (Arm)
2024-05-17 19:59 ` Rob Herring
2024-05-22 18:43 ` Laurentiu Mihalcea
2024-05-16 20:40 ` Laurentiu Mihalcea [this message]
2024-05-17 6:21 ` [PATCH 2/4] reset: add driver for imx8ulp SIM reset controller Amit Singh Tomar
2024-05-17 15:16 ` Frank Li
2024-05-20 14:41 ` Amit Singh Tomar
2024-05-22 19:20 ` Laurentiu Mihalcea
2024-05-16 20:40 ` [PATCH 3/4] dt-bindings: mfd: add schema for 8ulp's SIM Laurentiu Mihalcea
2024-05-16 21:22 ` Rob Herring (Arm)
2024-05-17 15:24 ` Frank Li
2024-05-16 20:40 ` [PATCH 4/4] arm64: dts: imx8ulp: add AVD-SIM node Laurentiu Mihalcea
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