linux-kernel - Re: [PATCH v3 4/6] scsi: ufs: host: Add support for parsing OPP

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Message-ID: <20230802053613.GF2370@thinkpad>
Date:   Wed, 2 Aug 2023 11:06:13 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To:     Viresh Kumar <viresh.kumar@...aro.org>
Cc:     vireshk@...nel.org, nm@...com, sboyd@...nel.org,
        myungjoo.ham@...sung.com, kyungmin.park@...sung.com,
        cw00.choi@...sung.com, andersson@...nel.org,
        konrad.dybcio@...aro.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
        jejb@...ux.ibm.com, martin.petersen@...cle.com,
        alim.akhtar@...sung.com, avri.altman@....com, bvanassche@....org,
        linux-scsi@...r.kernel.org, linux-pm@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        quic_asutoshd@...cinc.com, quic_cang@...cinc.com,
        quic_nitirawa@...cinc.com, quic_narepall@...cinc.com,
        quic_bhaskarv@...cinc.com, quic_richardp@...cinc.com,
        quic_nguyenb@...cinc.com, quic_ziqichen@...cinc.com,
        bmasney@...hat.com, krzysztof.kozlowski@...aro.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 4/6] scsi: ufs: host: Add support for parsing OPP

On Tue, Aug 01, 2023 at 02:33:33PM +0530, Viresh Kumar wrote:
> On 31-07-23, 22:03, Manivannan Sadhasivam wrote:
> > +int ufshcd_opp_config_clks(struct device *dev, struct opp_table *opp_table,
> > +			   struct dev_pm_opp *opp, void *data,
> > +			   bool scaling_down)
> > +{
> > +	struct ufs_hba *hba = dev_get_drvdata(dev);
> > +	struct list_head *head = &hba->clk_list_head;
> > +	struct ufs_clk_info *clki;
> > +	unsigned long freq;
> > +	u8 idx = 0;
> > +	int ret;
> > +
> > +	list_for_each_entry(clki, head, list) {
> > +		if (!IS_ERR_OR_NULL(clki->clk)) {
> 
> NULL is considered as a valid clock AFAIR, so you must only be doing
> IS_ERR() here I guess.

Agree that clk_ APIs accept NULL clk, but we already have IS_ERR_OR_NULL() check
everywhere in the driver for clk handling. So I used the same for consistency.

- Mani

> 
> -- 
> viresh

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