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https://github.com/nxp-imx/linux-imx.git
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2ce417e76c
This patch adds reset driver support for i.MX8ulp SIM (System Integration Module). The reset logic is controlled by the SIM. Reviewed-by: Jacky Bai <ping.bai@nxp.com> Signed-off-by: Liu Ying <victor.liu@nxp.com>
99 lines
2.6 KiB
C
99 lines
2.6 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright 2021 NXP
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*/
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#include <linux/mfd/syscon.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/regmap.h>
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#include <linux/reset-controller.h>
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#include <dt-bindings/reset/imx8ulp-sim-reset.h>
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#define AVD_SIM_SYSCTRL0 0x8
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struct imx8ulp_sim_reset {
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struct reset_controller_dev rcdev;
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struct regmap *regmap;
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};
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static const u32 imx8ulp_sim_reset_bits[IMX8ULP_SIM_RESET_NUM] = {
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[IMX8ULP_SIM_RESET_MIPI_DSI_RST_DPI_N] = BIT(3),
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[IMX8ULP_SIM_RESET_MIPI_DSI_RST_ESC_N] = BIT(4),
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[IMX8ULP_SIM_RESET_MIPI_DSI_RST_BYTE_N] = BIT(5),
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};
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static inline struct imx8ulp_sim_reset *
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to_imx8ulp_sim_reset(struct reset_controller_dev *rcdev)
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{
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return container_of(rcdev, struct imx8ulp_sim_reset, rcdev);
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}
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static int imx8ulp_sim_reset_assert(struct reset_controller_dev *rcdev,
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unsigned long id)
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{
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struct imx8ulp_sim_reset *simr = to_imx8ulp_sim_reset(rcdev);
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const u32 bit = imx8ulp_sim_reset_bits[id];
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return regmap_update_bits(simr->regmap, AVD_SIM_SYSCTRL0, bit, 0);
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}
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static int imx8ulp_sim_reset_deassert(struct reset_controller_dev *rcdev,
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unsigned long id)
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{
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struct imx8ulp_sim_reset *simr = to_imx8ulp_sim_reset(rcdev);
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const u32 bit = imx8ulp_sim_reset_bits[id];
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return regmap_update_bits(simr->regmap, AVD_SIM_SYSCTRL0, bit, bit);
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}
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static const struct reset_control_ops imx8ulp_sim_reset_ops = {
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.assert = imx8ulp_sim_reset_assert,
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.deassert = imx8ulp_sim_reset_deassert,
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};
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static const struct of_device_id imx8ulp_sim_reset_dt_ids[] = {
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{ .compatible = "nxp,imx8ulp-avd-sim-reset", },
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{ /* sentinel */ },
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};
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static int imx8ulp_sim_reset_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct imx8ulp_sim_reset *simr;
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int ret;
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simr = devm_kzalloc(dev, sizeof(*simr), GFP_KERNEL);
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if (!simr)
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return -ENOMEM;
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simr->regmap = syscon_node_to_regmap(dev->of_node->parent);
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if (IS_ERR(simr->regmap)) {
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ret = PTR_ERR(simr->regmap);
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dev_err(dev, "failed to get regmap: %d\n", ret);
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return ret;
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}
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simr->rcdev.owner = THIS_MODULE;
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simr->rcdev.nr_resets = IMX8ULP_SIM_RESET_NUM;
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simr->rcdev.ops = &imx8ulp_sim_reset_ops;
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simr->rcdev.of_node = dev->of_node;
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return devm_reset_controller_register(dev, &simr->rcdev);
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}
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static struct platform_driver imx8ulp_sim_reset_driver = {
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.probe = imx8ulp_sim_reset_probe,
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.driver = {
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.name = KBUILD_MODNAME,
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.of_match_table = imx8ulp_sim_reset_dt_ids,
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},
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};
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module_platform_driver(imx8ulp_sim_reset_driver);
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MODULE_AUTHOR("NXP Semiconductor");
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MODULE_DESCRIPTION("NXP i.MX8ulp System Integretion Module reset driver");
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MODULE_LICENSE("GPL v2");
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