On Fri, 2021-12-03 at 15:34 +0800, Qin Jian wrote:
[...]
> diff --git a/drivers/reset/reset-sunplus.c b/drivers/reset/reset-sunplus.c
> new file mode 100644
> index 000000000..a1d88dbaf
> --- /dev/null
> +++ b/drivers/reset/reset-sunplus.c
> @@ -0,0 +1,132 @@
> +// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +/*
> + * SP7021 reset driver
> + *
> + * Copyright (C) Sunplus Technology Co., Ltd.
> + * All rights reserved.
> + */
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/device.h>
> +#include <linux/err.h>
> +#include <linux/io.h>
> +#include <linux/of.h>
> +#include <linux/platform_device.h>
> +#include <linux/reset-controller.h>
> +#include <linux/reboot.h>
> +
> +/* HIWORD_MASK_REG BITS */
> +#define BITS_PER_HWM_REG 16
> +
> +struct sp_reset_data {
> + struct reset_controller_dev rcdev;
> + void __iomem *membase;
> +} *sp_reset;
^^^^^^^^^^
I'd prefer if you removed the global sp_reset pointer.
[...]
> +static int sp_restart(struct notifier_block *this, unsigned long mode,
> + void *cmd)
> +{
You could embed the sp_restart_nb notifier block in struct sp_reset_data
and use container_of(this, struct sp_reset_data, notifier) to get to the
rcdev here.
> + sp_reset_assert(&sp_reset->rcdev, 0);
> + sp_reset_deassert(&sp_reset->rcdev, 0);
> +
> + return NOTIFY_DONE;
> +}
> +
> +static struct notifier_block sp_restart_nb = {
> + .notifier_call = sp_restart,
> + .priority = 192,
> +};
> +
> +static const struct reset_control_ops sp_reset_ops = {
> + .assert = sp_reset_assert,
> + .deassert = sp_reset_deassert,
> + .status = sp_reset_status,
> +};
> +
> +static const struct of_device_id sp_reset_dt_ids[] = {
> + {.compatible = "sunplus,sp7021-reset",},
> + { /* sentinel */ },
> +};
> +
> +static int sp_reset_probe(struct platform_device *pdev)
> +{
> + struct device *dev = &pdev->dev;
> + void __iomem *membase;
> + struct resource *res;
> +
> + sp_reset = devm_kzalloc(&pdev->dev, sizeof(*sp_reset), GFP_KERNEL);
> + if (!sp_reset)
> + return -ENOMEM;
> +
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + membase = devm_ioremap_resource(dev, res);
> + if (IS_ERR(membase))
> + return PTR_ERR(membase);
> +
> + sp_reset->membase = membase;
> + sp_reset->rcdev.owner = THIS_MODULE;
> + sp_reset->rcdev.nr_resets = resource_size(res) / 4 * 16; /* HIWORD_MASK */
> + sp_reset->rcdev.ops = &sp_reset_ops;
> + sp_reset->rcdev.of_node = dev->of_node;
> + register_restart_handler(&sp_restart_nb);
Either do this after devm_reset_controller_register(), which could
theoretically fail with -ENOMEM, or call unregister_restart_handler() in
the error case below.
> +
> + return devm_reset_controller_register(dev, &sp_reset->rcdev);
> +}
> +
> +static struct platform_driver sp_reset_driver = {
> + .probe = sp_reset_probe,
> + .driver = {
> + .name = "sunplus-reset",
> + .of_match_table = sp_reset_dt_ids,
^
Please fix the indentation, two tabs here.
.suppress_bind_attrs = true,
to stop unbinding the driver. Alternatively, add a driver remove
function that unregisters the restart handler.
> + },
^
One tab here.
> +};
> +
> +module_platform_driver(sp_reset_driver);
> +
> +MODULE_AUTHOR("Edwin Chiu <edwin.chiu@xxxxxxxxxxx>");
> +MODULE_DESCRIPTION("Sunplus Reset Driver");
> +MODULE_LICENSE("GPL v2");
regards
Philipp
