linux-kernel - Re: [Patch v5 2/8] firmware: qcom: scm: Convert SCM to platform driver

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Message-ID: <20160602221424.GM28218@codeaurora.org>
Date:	Thu, 2 Jun 2016 15:14:24 -0700
From:	Stephen Boyd <sboyd@...eaurora.org>
To:	Andy Gross <andy.gross@...aro.org>
Cc:	linux-arm-msm@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Bjorn Andersson <bjorn.andersson@...aro.org>,
	devicetree@...r.kernel.org, jilai wang <jilaiw@...eaurora.org>
Subject: Re: [Patch v5 2/8] firmware: qcom: scm: Convert SCM to platform
 driver

On 05/12, Andy Gross wrote:
> This patch converts the Qualcomm SCM firmware driver into a platform
> driver.

And introduces clk enable/disable + rate setting logic because
the firmware uses crypto clks during some scm calls.

> 
> +
> +static struct platform_driver qcom_scm_driver = {
> +	.driver = {
> +		.name	= "qcom_scm",
> +		.of_match_table = qcom_scm_dt_match,
> +	},
> +	.probe = qcom_scm_probe,
> +};
> +
> +static int __init qcom_scm_init(void)
> +{
> +	struct device_node *np, *parent;
> +	int ret;
> +
> +	np = of_find_matching_node_and_match(NULL, qcom_scm_dt_match, NULL);

Why can't we find a node called "firmware" in the root of the
tree? That would be clearer what's going on here, and avoid the
need to do the of_get_next_parent() dance, which just feels
awkward.

> +
> +	if (!np)
> +		return -ENODEV;
> +
> +	parent = of_get_next_parent(np);
> +	ret = of_platform_populate(parent, qcom_scm_dt_match, NULL, NULL);
> +
> +	of_node_put(parent);
> +
> +	if (ret)
> +		return ret;
> +
> +	return platform_driver_register(&qcom_scm_driver);
> +}

-- 
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a Linux Foundation Collaborative Project