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- From ff806bda9b04bcf73350e319f3efde5cd049b77a Mon Sep 17 00:00:00 2001
- From: Emil Renner Berthing <[email protected]>
- Date: Sat, 20 Nov 2021 19:30:49 +0100
- Subject: [PATCH 1022/1024] reset: starfive: Add JH7100 audio reset driver
- The audio resets are almost identical to the system resets, there are
- just fewer of them. So factor out and export a generic probe function,
- so most of the reset controller implementation can be shared.
- Signed-off-by: Emil Renner Berthing <[email protected]>
- ---
- MAINTAINERS | 2 +-
- drivers/reset/starfive/Kconfig | 7 ++
- drivers/reset/starfive/Makefile | 2 +
- .../starfive/reset-starfive-jh7100-audio.c | 66 +++++++++++++++++++
- .../reset/starfive/reset-starfive-jh7100.h | 16 +++++
- 5 files changed, 92 insertions(+), 1 deletion(-)
- create mode 100644 drivers/reset/starfive/reset-starfive-jh7100-audio.c
- create mode 100644 drivers/reset/starfive/reset-starfive-jh7100.h
- --- a/MAINTAINERS
- +++ b/MAINTAINERS
- @@ -19711,7 +19711,7 @@ STARFIVE JH71X0 RESET CONTROLLER DRIVERS
- M: Emil Renner Berthing <[email protected]>
- M: Hal Feng <[email protected]>
- S: Maintained
- -F: Documentation/devicetree/bindings/reset/starfive,jh7100-reset.yaml
- +F: Documentation/devicetree/bindings/reset/starfive,jh7100-*.yaml
- F: drivers/reset/starfive/reset-starfive-jh71*
- F: include/dt-bindings/reset/starfive?jh71*.h
-
- --- a/drivers/reset/starfive/Kconfig
- +++ b/drivers/reset/starfive/Kconfig
- @@ -11,6 +11,13 @@ config RESET_STARFIVE_JH7100
- help
- This enables the reset controller driver for the StarFive JH7100 SoC.
-
- +config RESET_STARFIVE_JH7100_AUDIO
- + tristate "StarFive JH7100 Audio Reset Driver"
- + depends on RESET_STARFIVE_JH7100
- + default m if SOC_STARFIVE
- + help
- + This enables the audio reset driver for the StarFive JH7100 SoC.
- +
- config RESET_STARFIVE_JH7110
- bool "StarFive JH7110 Reset Driver"
- depends on AUXILIARY_BUS && CLK_STARFIVE_JH7110_SYS
- --- a/drivers/reset/starfive/Makefile
- +++ b/drivers/reset/starfive/Makefile
- @@ -2,4 +2,6 @@
- obj-$(CONFIG_RESET_STARFIVE_JH71X0) += reset-starfive-jh71x0.o
-
- obj-$(CONFIG_RESET_STARFIVE_JH7100) += reset-starfive-jh7100.o
- +obj-$(CONFIG_RESET_STARFIVE_JH7100_AUDIO) += reset-starfive-jh7100-audio.o
- +
- obj-$(CONFIG_RESET_STARFIVE_JH7110) += reset-starfive-jh7110.o
- --- /dev/null
- +++ b/drivers/reset/starfive/reset-starfive-jh7100-audio.c
- @@ -0,0 +1,66 @@
- +// SPDX-License-Identifier: GPL-2.0-or-later
- +/*
- + * Audio reset driver for the StarFive JH7100 SoC
- + *
- + * Copyright (C) 2021 Emil Renner Berthing <[email protected]>
- + */
- +
- +#include <linux/mod_devicetable.h>
- +#include <linux/module.h>
- +#include <linux/platform_device.h>
- +
- +#include "reset-starfive-jh71x0.h"
- +
- +#include <dt-bindings/reset/starfive-jh7100-audio.h>
- +
- +/* register offsets */
- +#define JH7100_AUDRST_ASSERT0 0x00
- +#define JH7100_AUDRST_STATUS0 0x04
- +
- +/*
- + * Writing a 1 to the n'th bit of the ASSERT register asserts
- + * line n, and writing a 0 deasserts the same line.
- + * Most reset lines have their status inverted so a 0 bit in the STATUS
- + * register means the line is asserted and a 1 means it's deasserted. A few
- + * lines don't though, so store the expected value of the status registers when
- + * all lines are asserted.
- + */
- +static const u32 jh7100_audrst_asserted[1] = {
- + BIT(JH7100_AUDRST_USB_AXI) |
- + BIT(JH7100_AUDRST_USB_PWRUP_RST_N) |
- + BIT(JH7100_AUDRST_USB_PONRST)
- +};
- +
- +static int jh7100_audrst_probe(struct platform_device *pdev)
- +{
- + void __iomem *base = devm_platform_ioremap_resource(pdev, 0);
- +
- + if (IS_ERR(base))
- + return PTR_ERR(base);
- +
- + return reset_starfive_jh71x0_register(&pdev->dev, pdev->dev.of_node,
- + base + JH7100_AUDRST_ASSERT0,
- + base + JH7100_AUDRST_STATUS0,
- + jh7100_audrst_asserted,
- + JH7100_AUDRSTN_END,
- + THIS_MODULE);
- +}
- +
- +static const struct of_device_id jh7100_audrst_dt_ids[] = {
- + { .compatible = "starfive,jh7100-audrst" },
- + { /* sentinel */ }
- +};
- +MODULE_DEVICE_TABLE(of, jh7100_audrst_dt_ids);
- +
- +static struct platform_driver jh7100_audrst_driver = {
- + .probe = jh7100_audrst_probe,
- + .driver = {
- + .name = "jh7100-reset-audio",
- + .of_match_table = jh7100_audrst_dt_ids,
- + },
- +};
- +module_platform_driver(jh7100_audrst_driver);
- +
- +MODULE_AUTHOR("Emil Renner Berthing");
- +MODULE_DESCRIPTION("StarFive JH7100 audio reset driver");
- +MODULE_LICENSE("GPL");
- --- /dev/null
- +++ b/drivers/reset/starfive/reset-starfive-jh7100.h
- @@ -0,0 +1,16 @@
- +// SPDX-License-Identifier: GPL-2.0-or-later
- +/*
- + * Copyright (C) 2021 Emil Renner Berthing <[email protected]>
- + */
- +
- +#ifndef _RESET_STARFIVE_JH7100_H_
- +#define _RESET_STARFIVE_JH7100_H_
- +
- +#include <linux/platform_device.h>
- +
- +int reset_starfive_jh7100_generic_probe(struct platform_device *pdev,
- + const u32 *asserted,
- + unsigned int status_offset,
- + unsigned int nr_resets);
- +
- +#endif
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