linux-kernel - Re: [PATCH V2 6/7] arm64: dts: qcom: ipq9574: Add support for nsscc node

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Message-ID: <3260f0ca-9e27-4920-8415-7f364dff773d@linaro.org>
Date:   Wed, 13 Sep 2023 10:43:34 +0200
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Devi Priya <quic_devipriy@...cinc.com>, andersson@...nel.org,
        agross@...nel.org, mturquette@...libre.com, sboyd@...nel.org,
        robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        conor+dt@...nel.org, catalin.marinas@....com, will@...nel.org,
        p.zabel@...gutronix.de, richardcochran@...il.com, arnd@...db.de,
        geert+renesas@...der.be, nfraprado@...labora.com, rafal@...ecki.pl,
        peng.fan@....com, linux-arm-msm@...r.kernel.org,
        linux-clk@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        netdev@...r.kernel.org, quic_saahtoma@...cinc.com
Subject: Re: [PATCH V2 6/7] arm64: dts: qcom: ipq9574: Add support for nsscc
 node

On 13.09.2023 10:38, Geert Uytterhoeven wrote:
> Hi Krzysztof,
> 
> On Wed, Sep 13, 2023 at 10:26 AM Krzysztof Kozlowski
> <krzysztof.kozlowski@...aro.org> wrote:
>> On 13/09/2023 10:23, Geert Uytterhoeven wrote:
>>>>
>>>>> +                       clock-names = "nssnoc_nsscc", "nssnoc_snoc", "nssnoc_snoc_1",
>>>>> +                                     "bias_pll_cc_clk", "bias_pll_nss_noc_clk",
>>>>> +                                     "bias_pll_ubi_nc_clk", "gpll0_out_aux", "uniphy0_nss_rx_clk",
>>>>> +                                     "uniphy0_nss_tx_clk", "uniphy1_nss_rx_clk",
>>>>> +                                     "uniphy1_nss_tx_clk", "uniphy2_nss_rx_clk",
>>>>> +                                     "uniphy2_nss_tx_clk", "xo_board_clk";
>>>>
>>>> You are using clock indices. Please drop clock-names.
>>>
>>> What do you mean by "using clock indices"?
>>> Note that the "clock-names" property is required according to the DT bindings.
>>
>> Indeed, thanks for pointing this out. Probably bindings should be changed.
> 
> But what's so great about not having "clock-names"?
> There are _14_ input clocks.
clk_parent_data has an "index" member, which lets us bind
clocks[n] to parent[n]. With the DT properties being ABI,
including the order of entries within, that lets us get rid
of clock-names and the matching is marginally faster.

Konrad