linux-kernel - Re: [RFC v3 04/18] firmware: thead: Add AON firmware protocol driver

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Message-ID: <20250121-small-ruby-seahorse-7475d0@krzk-bin>
Date: Tue, 21 Jan 2025 10:56:48 +0100
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Michal Wilczynski <m.wilczynski@...sung.com>
Cc: mturquette@...libre.com, sboyd@...nel.org, robh@...nel.org, 
	krzk+dt@...nel.org, conor+dt@...nel.org, drew@...7.com, guoren@...nel.org, 
	wefu@...hat.com, jassisinghbrar@...il.com, paul.walmsley@...ive.com, 
	palmer@...belt.com, aou@...s.berkeley.edu, frank.binns@...tec.com, 
	matt.coster@...tec.com, maarten.lankhorst@...ux.intel.com, mripard@...nel.org, 
	tzimmermann@...e.de, airlied@...il.com, simona@...ll.ch, ulf.hansson@...aro.org, 
	jszhang@...nel.org, p.zabel@...gutronix.de, m.szyprowski@...sung.com, 
	linux-clk@...r.kernel.org, devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-riscv@...ts.infradead.org, dri-devel@...ts.freedesktop.org, linux-pm@...r.kernel.org
Subject: Re: [RFC v3 04/18] firmware: thead: Add AON firmware protocol driver

On Mon, Jan 20, 2025 at 06:20:57PM +0100, Michal Wilczynski wrote:
> +#include <linux/firmware/thead/thead,th1520-aon.h>
> +#include <linux/mailbox_client.h>
> +#include <linux/mailbox_controller.h>
> +#include <linux/mod_devicetable.h>
> +#include <linux/of_platform.h>
> +#include <linux/platform_device.h>
> +
> +#include <dt-bindings/firmware/thead,th1520-aon.h>

How/where do you use this header?

> +
> +#define MAX_RX_TIMEOUT (msecs_to_jiffies(3000))
> +#define MAX_TX_TIMEOUT 500
> +
> +struct th1520_aon_chan {
> +	struct platform_device *pd;
> +	struct mbox_chan *ch;
> +	struct th1520_aon_rpc_ack_common ack_msg;
> +	struct mbox_client cl;
> +	struct completion done;
> +
> +	/* make sure only one RPC is perfomed at a time */
> +	struct mutex transaction_lock;
> +};
> +

...

> +static int th1520_aon_probe(struct platform_device *pdev)
> +{
> +	struct device *dev = &pdev->dev;
> +	struct th1520_aon_chan *aon_chan;
> +	struct mbox_client *cl;
> +	int ret;
> +	struct platform_device_info pdevinfo = {
> +		.name = "th1520-pd",
> +		.id = PLATFORM_DEVID_AUTO,
> +		.parent = dev,
> +	};
> +
> +	aon_chan = devm_kzalloc(dev, sizeof(*aon_chan), GFP_KERNEL);
> +	if (!aon_chan)
> +		return -ENOMEM;
> +
> +	cl = &aon_chan->cl;
> +	cl->dev = dev;
> +	cl->tx_block = true;
> +	cl->tx_tout = MAX_TX_TIMEOUT;
> +	cl->rx_callback = th1520_aon_rx_callback;
> +
> +	aon_chan->ch = mbox_request_channel_byname(cl, "aon");
> +	if (IS_ERR(aon_chan->ch)) {
> +		ret = PTR_ERR(aon_chan->ch);

Drop, pointless. The entire point of using dev_err_probe is to make it
simple.

> +		return dev_err_probe(dev, ret, "Failed to request aon mbox chan\n");
> +	}
> +
> +	mutex_init(&aon_chan->transaction_lock);
> +	init_completion(&aon_chan->done);
> +
> +	platform_set_drvdata(pdev, aon_chan);
> +
> +	aon_chan->pd = platform_device_register_full(&pdevinfo);
> +	ret = PTR_ERR_OR_ZERO(aon_chan->pd);
> +	if (ret) {
> +		dev_err(dev, "Failed to register child device 'th1520-pd': %d\n", ret);
> +		goto free_mbox_chan;
> +	}
> +
> +	ret = devm_of_platform_populate(dev);
> +	if (ret)
> +		goto unregister_pd;
> +
> +	return 0;
> +
> +unregister_pd:
> +	platform_device_unregister(aon_chan->pd);
> +free_mbox_chan:
> +	mbox_free_channel(aon_chan->ch);
> +
> +	return ret;
> +}
> +
> +static void th1520_aon_remove(struct platform_device *pdev)
> +{
> +	struct th1520_aon_chan *aon_chan = platform_get_drvdata(pdev);
> +
> +	platform_device_unregister(aon_chan->pd);
> +	mbox_free_channel(aon_chan->ch);
> +}
> +
> +static const struct of_device_id th1520_aon_match[] = {
> +	{ .compatible = "thead,th1520-aon" },
> +	{ /* Sentinel */ }
> +};
> +MODULE_DEVICE_TABLE(of, th1520_aon_match);
> +
> +static struct platform_driver th1520_aon_driver = {
> +	.driver = {
> +		.name = "th1520-aon",
> +		.of_match_table = th1520_aon_match,
> +	},
> +	.probe = th1520_aon_probe,
> +	.remove = th1520_aon_remove,
> +};
> +module_platform_driver(th1520_aon_driver);
> +
> +MODULE_AUTHOR("Michal Wilczynski <m.wilczynski@...sung.com>");
> +MODULE_DESCRIPTION("T-HEAD TH1520 Always-On firmware driver");
> +MODULE_LICENSE("GPL");
> diff --git a/include/linux/firmware/thead/thead,th1520-aon.h b/include/linux/firmware/thead/thead,th1520-aon.h
> new file mode 100644
> index 000000000000..3daa17c01d17
> --- /dev/null
> +++ b/include/linux/firmware/thead/thead,th1520-aon.h
> @@ -0,0 +1,186 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * Copyright (C) 2021 Alibaba Group Holding Limited.
> + */
> +
> +#ifndef _THEAD_AON_H
> +#define _THEAD_AON_H
> +
> +#include <linux/device.h>
> +#include <linux/types.h>
> +
> +#define AON_RPC_MSG_MAGIC (0xef)
> +#define TH1520_AON_RPC_VERSION 2
> +#define TH1520_AON_RPC_MSG_NUM 7
> +
> +extern struct th1520_aon_chan *aon_chan;

Drop all externs.


Best regards,
Krzysztof