linux-kernel - Re: [PATCH v3 2/3] clk: hisilicon: Add support for Hi3660 stub clocks

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Date:   Thu, 7 Dec 2017 16:04:49 +0800
From:   Leo Yan <leo.yan@...aro.org>
To:     Stephen Boyd <sboyd@...eaurora.org>
Cc:     Xu YiPing <xuyiping@...ilicon.com>, mturquette@...libre.com,
        robh+dt@...nel.org, mark.rutland@....com, xuwei5@...ilicon.com,
        catalin.marinas@....com, will.deacon@....com,
        xuejiancheng@...ilicon.com, wenpan@...ilicon.com,
        zhangfei.gao@...aro.org, guodong.xu@...aro.org,
        zhongkaihua@...wei.com, chenjun14@...wei.com,
        linux-clk@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        suzhuangluan@...ilicon.com, xuezhiliang@...ilicon.com,
        kevin.wangtao@...ilicon.com
Subject: Re: [PATCH v3 2/3] clk: hisilicon: Add support for Hi3660 stub clocks

On Wed, Dec 06, 2017 at 11:05:50PM -0800, Stephen Boyd wrote:
> On 11/17, Xu YiPing wrote:
> > From: Kaihua Zhong <zhongkaihua@...wei.com>
> > +
> > +static struct clk_hw *hi3660_stub_clk_hw_get(struct of_phandle_args *clkspec,
> > +					     void *data)
> > +{
> > +	unsigned int idx = clkspec->args[0];
> > +
> > +	if (idx > HI3660_CLK_STUB_NUM) {
> 
> This should be >=
> 
> > +	}
> > +
> > +	return &hi3660_stub_clks[idx].hw;
> > +}
> > +
> > +static int hi3660_stub_clk_probe(struct platform_device *pdev)
> > +{
> > +	struct device *dev = &pdev->dev;
> > +	struct resource *res;
> > +	unsigned int i;
> > +	int ret;
> > +
> > +	/* Use mailbox client without blocking */
> > +	stub_clk_chan.cl.dev = dev;
> > +	stub_clk_chan.cl.tx_done = NULL;
> > +	stub_clk_chan.cl.tx_block = false;
> > +	stub_clk_chan.cl.knows_txdone = false;
> > +
> > +	/* Allocate mailbox channel */
> > +	stub_clk_chan.mbox = mbox_request_channel(&stub_clk_chan.cl, 0);
> > +	if (IS_ERR(stub_clk_chan.mbox))
> > +		return PTR_ERR(stub_clk_chan.mbox);
> > +
> > +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> > +	freq_reg = devm_ioremap(dev, res->start, resource_size(res));
> > +	if (IS_ERR(freq_reg))
> 
> Pretty sure this returns NULL on failure, not an error pointer.
> 
> > +		return -ENOMEM;
> > +
> > +	freq_reg += HI3660_STUB_CLOCK_DATA;
> > +
> > +	for (i = 0; i < HI3660_CLK_STUB_NUM; i++) {
> > +		ret = devm_clk_hw_register(&pdev->dev, &hi3660_stub_clks[i].hw);
> > +		if (ret)
> > +			return ret;
> > +	}
> > +
> > +	ret = of_clk_add_hw_provider(pdev->dev.of_node, hi3660_stub_clk_hw_get,
> > +				     hi3660_stub_clks);
> 
> This can use devm
> 
> > +	return ret;
> > +}
> > +
> 
> I fixed it all and merged into clk-next.

Ah, very appreciate your help, Stephen.

Thanks,
Leo Yan