Received: by 2002:a25:7ec1:0:0:0:0:0 with SMTP id z184csp6782205ybc; Thu, 28 Nov 2019 05:27:06 -0800 (PST) X-Google-Smtp-Source: APXvYqw7z/m+JY+5FIU5ID1dJPtdEiKi8u6kS6zdOZ5nQAijhawtU5cWjjPhaQhJ6YqZGwXMP/GX X-Received: by 2002:a17:906:27cc:: with SMTP id k12mr55945245ejc.181.1574947626036; Thu, 28 Nov 2019 05:27:06 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1574947626; cv=none; d=google.com; s=arc-20160816; b=SmW7gE/5go2mkv1jlvkqTm5a+XfGNqyozvDlBRz89umt/9gTzihG77VLGlXYdfq9Xa KkuSSb13PnRuFM5gUwUXElpjOkEe/+gQ9f9W26BNQ0aa5XjBgUpkfsIyf4cpclpWpAbt YsDBnXrbZmV/h0m+cjRflzkxjtlQ/bJmQLKWI9aVF8d3dipuw9gZ42qFcY2s62cLPul5 kSZ7S/s2NIQWk2biJcWHFJe7hfcLMy8AcN/iJ0Ht43BXUTsHJRMw1ML6yNL/cbpA8uKt UpJo8ZAWUG71AqsLR/Q/ruMw6avx/KHPf1yhwiv4kLpgbJKrYVSKROdzqVZ5oWaf5niO lKuA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:content-transfer-encoding :content-language:in-reply-to:mime-version:user-agent:date :message-id:from:references:cc:to:subject:dkim-signature; bh=G/d1TkhCeblT/3d5R7NOwD7vHd7mbksNpieQKKaf2tI=; b=IRXO84wAeDm0Scvxy7xwISVyqxlFsS3iujHQS706/9VBo4UPRaIKDcbx2OrvpvdOe1 merVZwntbS5W6deY//wF2V/B69NUf5ufvHegXS5LJ6zR6/d/DbFFTMaY5QnPCsqtRgay sSXoBt9pAi1lXMP2ibuuP4hzd3r66vEe1t4VqJrwVWSv3JeqSNlFVndbZgI6NIfUcI/5 EjwldVFhWLtp3f6ptPnfcCiQLC7SD2qo4U9O5CsfPj7TLWH/1zJxBSGT5NXmQaT3dfMg sLl44LrYPMwQLSltlB9obBoMet+raQ478icNDYsUh04VajJJeXGjFtXn9K8brSNduFKI Masg== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@gmail.com header.s=20161025 header.b=FMezP4i4; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=gmail.com Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id l2si11592664ejx.420.2019.11.28.05.26.40; Thu, 28 Nov 2019 05:27:06 -0800 (PST) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=pass header.i=@gmail.com header.s=20161025 header.b=FMezP4i4; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=gmail.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726561AbfK1NZn (ORCPT + 99 others); Thu, 28 Nov 2019 08:25:43 -0500 Received: from mail-lj1-f194.google.com ([209.85.208.194]:46299 "EHLO mail-lj1-f194.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726227AbfK1NZn (ORCPT ); Thu, 28 Nov 2019 08:25:43 -0500 Received: by mail-lj1-f194.google.com with SMTP id e9so28489482ljp.13; Thu, 28 Nov 2019 05:25:40 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=subject:to:cc:references:from:message-id:date:user-agent :mime-version:in-reply-to:content-language:content-transfer-encoding; bh=G/d1TkhCeblT/3d5R7NOwD7vHd7mbksNpieQKKaf2tI=; b=FMezP4i4ti/lGZ60nflNprU5hqRz2xlm2sII2k5g4PgjhJiwULTmlRvBZsmazyNZIL dhsETjDC2xrE5oiRVY4d2IedJYeMrxsIpXRZXykSYLdvp1MrLvp4emkVv3T2M/1gPiaH ya3zUuvhUbLEhRVpdIldAVfjUIHDe9fVdPDK02PTlm830XNS1JUJ3Ytjf3IqZBEsNE+9 P0T3K4Nf7PqYin2iEN6tP/KGh7PXe9kXWNIsYNZYoKqqIOBz2O55rnG5jjW3zSQzsFkB KupkMgqX4bhlnGGrqCosi04VXIl/pUqzvoUdo5GlNxi8UcPhJ2/jg0s4uCYDcOMuSuAX /kUw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=G/d1TkhCeblT/3d5R7NOwD7vHd7mbksNpieQKKaf2tI=; b=YGWccmSl0LpxTIUHnDxVukof5KZ80PnoW04t/T5J5KmnUTU+uMLzT5uiDY35x2vwLQ y5Fuam4VtdGWwJ4jON3ucvZNp6cTqTnN5s/ag7DPKmAthK6qb4AGrr9pGQyxiep1ZQKk ooxdwi7cSIqAIIqtphfk334V68GsD62qHVO+e/tzkr5Y4IYz8MWHyMmlBk8c1Bb86T8p yeoAxw+LnYvhxZDF1EcxapLsfdvsw9I7E/Y98w10DhgywdDInUZZMobkPzohAQc1Wqvs d0WmD6ustnWdgMVPSnZXDcrB9S1NBfeJf1m4q6uKj1Yfu87xPlSaQ0kuiSHjlNp3Il2T KdFQ== X-Gm-Message-State: APjAAAV6RW3RAzl+glcFaTDY7R2C8hcGRQ8InjLKWi3MPcRP0rIwoJgh SOJoEDLAYsNpn6VWaFOtVcqwO5yb X-Received: by 2002:a2e:9256:: with SMTP id v22mr3856958ljg.124.1574947539559; Thu, 28 Nov 2019 05:25:39 -0800 (PST) Received: from [192.168.2.145] (79-139-233-37.dynamic.spd-mgts.ru. [79.139.233.37]) by smtp.googlemail.com with ESMTPSA id c80sm9859720lfg.81.2019.11.28.05.25.37 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 28 Nov 2019 05:25:38 -0800 (PST) Subject: Re: [PATCH v2 02/11] soc: tegra: Add Tegra PMC clock registrations into PMC driver To: Sowjanya Komatineni , thierry.reding@gmail.com, jonathanh@nvidia.com, mperttunen@nvidia.com, gregkh@linuxfoundation.org, sboyd@kernel.org, tglx@linutronix.de, robh+dt@kernel.org, mark.rutland@arm.com Cc: allison@lohutok.net, pdeschrijver@nvidia.com, pgaikwad@nvidia.com, mturquette@baylibre.com, horms+renesas@verge.net.au, Jisheng.Zhang@synaptics.com, krzk@kernel.org, arnd@arndb.de, spujar@nvidia.com, josephl@nvidia.com, vidyas@nvidia.com, daniel.lezcano@linaro.org, mmaddireddy@nvidia.com, markz@nvidia.com, devicetree@vger.kernel.org, linux-clk@vger.kernel.org, linux-tegra@vger.kernel.org, linux-kernel@vger.kernel.org References: <1574830773-14892-1-git-send-email-skomatineni@nvidia.com> <1574830773-14892-3-git-send-email-skomatineni@nvidia.com> <749de44c-ec59-3cab-c02e-7b8fcb1fb9f4@gmail.com> <3d1492a1-f2a5-2d56-5341-a28fcb73fe64@nvidia.com> From: Dmitry Osipenko Message-ID: <484cb1bb-4fb2-9e71-87be-2bd5bd5b2348@gmail.com> Date: Thu, 28 Nov 2019 16:25:37 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.1.1 MIME-Version: 1.0 In-Reply-To: <3d1492a1-f2a5-2d56-5341-a28fcb73fe64@nvidia.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 28.11.2019 01:57, Sowjanya Komatineni пишет: > > On 11/27/19 7:14 AM, Dmitry Osipenko wrote: >> 27.11.2019 07:59, Sowjanya Komatineni пишет: >>> Tegra210 and prior Tegra PMC has clk_out_1, clk_out_2, clk_out_3 with >>> mux and gate for each of these clocks. >>> >>> Currently these PMC clocks are registered by Tegra clock driver using >>> clk_register_mux and clk_register_gate by passing PMC base address >>> and register offsets and PMC programming for these clocks happens >>> through direct PMC access by the clock driver. >>> >>> With this, when PMC is in secure mode any direct PMC access from the >>> non-secure world does not go through and these clocks will not be >>> functional. >>> >>> This patch adds these clocks registration with PMC as a clock provider >>> for these clocks. clk_ops callback implementations for these clocks >>> uses tegra_pmc_readl and tegra_pmc_writel which supports PMC programming >>> in secure mode and non-secure mode. >>> >>> Signed-off-by: Sowjanya Komatineni >>> --- >>>   drivers/soc/tegra/pmc.c | 330 >>> ++++++++++++++++++++++++++++++++++++++++++++++++ >>>   1 file changed, 330 insertions(+) >>> >>> diff --git a/drivers/soc/tegra/pmc.c b/drivers/soc/tegra/pmc.c >>> index ea0e11a09c12..a353f6d0a832 100644 >>> --- a/drivers/soc/tegra/pmc.c >>> +++ b/drivers/soc/tegra/pmc.c >>> @@ -13,6 +13,9 @@ >>>     #include >>>   #include >>> +#include >>> +#include >>> +#include >>>   #include >>>   #include >>>   #include >>> @@ -48,6 +51,7 @@ >>>   #include >>>   #include >>>   #include >>> +#include >>>     #define PMC_CNTRL            0x0 >>>   #define  PMC_CNTRL_INTR_POLARITY    BIT(17) /* inverts INTR >>> polarity */ >>> @@ -100,6 +104,7 @@ >>>   #define PMC_WAKE2_STATUS        0x168 >>>   #define PMC_SW_WAKE2_STATUS        0x16c >>>   +#define PMC_CLK_OUT_CNTRL        0x1a8 >>>   #define PMC_SENSOR_CTRL            0x1b0 >>>   #define  PMC_SENSOR_CTRL_SCRATCH_WRITE    BIT(2) >>>   #define  PMC_SENSOR_CTRL_ENABLE_RST    BIT(1) >>> @@ -155,6 +160,91 @@ >>>   #define  TEGRA_SMC_PMC_READ    0xaa >>>   #define  TEGRA_SMC_PMC_WRITE    0xbb >>>   +struct pmc_clk_mux { >>> +    struct clk_hw    hw; >>> +    unsigned long    offs; >>> +    u32        mask; >>> +    u32        shift; >>> +}; >>> + >>> +#define to_pmc_clk_mux(_hw) container_of(_hw, struct pmc_clk_mux, hw) >>> + >>> +struct pmc_clk_gate { >>> +    struct clk_hw    hw; >>> +    unsigned long    offs; >>> +    u32        shift; >>> +}; >>> + >>> +#define to_pmc_clk_gate(_hw) container_of(_hw, struct pmc_clk_gate, hw) >>> + >>> +struct pmc_clk_init_data { >>> +    char *mux_name; >>> +    char *gate_name; >>> +    const char **parents; >>> +    int num_parents; >>> +    int mux_id; >>> +    int gate_id; >>> +    char *dev_name; >>> +    u8 mux_shift; >>> +    u8 gate_shift; >>> +    u8 init_parent_index; >>> +    int init_state; >>> +}; >>> + >>> +static const char *clk_out1_parents[] = { "clk_m", "clk_m_div2", >>> +    "clk_m_div4", "extern1", >>> +}; >>> + >>> +static const char *clk_out2_parents[] = { "clk_m", "clk_m_div2", >>> +    "clk_m_div4", "extern2", >>> +}; >>> + >>> +static const char *clk_out3_parents[] = { "clk_m", "clk_m_div2", >>> +    "clk_m_div4", "extern3", >>> +}; >>> + >>> +static struct pmc_clk_init_data tegra_pmc_clks_data[] = { >>> +    { >>> +        .mux_name = "clk_out_1_mux", >>> +        .gate_name = "clk_out_1", >>> +        .parents = clk_out1_parents, >>> +        .num_parents = ARRAY_SIZE(clk_out1_parents), >>> +        .mux_id = TEGRA_PMC_CLK_OUT_1_MUX, >>> +        .gate_id = TEGRA_PMC_CLK_OUT_1, >>> +        .dev_name = "extern1", >>> +        .mux_shift = 6, >>> +        .gate_shift = 2, >>> +        .init_parent_index = 3, >>> +        .init_state = 1, >>> +    }, >>> +    { >>> +        .mux_name = "clk_out_2_mux", >>> +        .gate_name = "clk_out_2", >>> +        .parents = clk_out2_parents, >>> +        .num_parents = ARRAY_SIZE(clk_out2_parents), >>> +        .mux_id = TEGRA_PMC_CLK_OUT_2_MUX, >>> +        .gate_id = TEGRA_PMC_CLK_OUT_2, >>> +        .dev_name = "extern2", >>> +        .mux_shift = 14, >>> +        .gate_shift = 10, >>> +        .init_parent_index = 0, >>> +        .init_state = 0, >>> +    }, >>> +    { >>> +        .mux_name = "clk_out_3_mux", >>> +        .gate_name = "clk_out_3", >>> +        .parents = clk_out3_parents, >>> +        .num_parents = ARRAY_SIZE(clk_out3_parents), >>> +        .mux_id = TEGRA_PMC_CLK_OUT_3_MUX, >>> +        .gate_id = TEGRA_PMC_CLK_OUT_3, >>> +        .dev_name = "extern3", >>> +        .mux_shift = 22, >>> +        .gate_shift = 18, >>> +        .init_parent_index = 0, >>> +        .init_state = 0, >>> +    }, >>> +}; >>> + >>>   struct tegra_powergate { >>>       struct generic_pm_domain genpd; >>>       struct tegra_pmc *pmc; >>> @@ -254,6 +344,9 @@ struct tegra_pmc_soc { >>>        */ >>>       const struct tegra_wake_event *wake_events; >>>       unsigned int num_wake_events; >>> + >>> +    struct pmc_clk_init_data *pmc_clks_data; >>> +    unsigned int num_pmc_clks; >>>   }; >>>     static const char * const tegra186_reset_sources[] = { >>> @@ -2163,6 +2256,228 @@ static int tegra_pmc_clk_notify_cb(struct >>> notifier_block *nb, >>>       return NOTIFY_OK; >>>   } >>>   +static void pmc_clk_fence_udelay(u32 offset) >>> +{ >>> +    tegra_pmc_readl(pmc, offset); >>> +    /* pmc clk propagation delay 2 us */ >>> +    udelay(2); >>> +} >>> + >>> +static u8 pmc_clk_mux_get_parent(struct clk_hw *hw) >>> +{ >>> +    struct pmc_clk_mux *mux = to_pmc_clk_mux(hw); >>> +    int num_parents = clk_hw_get_num_parents(hw); >>> +    u32 val; >>> + >>> +    val = tegra_pmc_readl(pmc, mux->offs) >> mux->shift; >>> +    val &= mux->mask; >>> + >>> +    if (val >= num_parents) >>> +        return -EINVAL; >>> + >>> +    return val; >>> +} >>> + >>> +static int pmc_clk_mux_set_parent(struct clk_hw *hw, u8 index) >>> +{ >>> +    struct pmc_clk_mux *mux = to_pmc_clk_mux(hw); >>> +    u32 val; >>> + >>> +    val = tegra_pmc_readl(pmc, mux->offs); >>> +    val &= ~(mux->mask << mux->shift); >>> +    val |= index << mux->shift; >>> +    tegra_pmc_writel(pmc, val, mux->offs); >>> +    pmc_clk_fence_udelay(mux->offs); >>> + >>> +    return 0; >>> +} >>> + >>> +static const struct clk_ops pmc_clk_mux_ops = { >>> +    .get_parent = pmc_clk_mux_get_parent, >>> +    .set_parent = pmc_clk_mux_set_parent, >>> +    .determine_rate = __clk_mux_determine_rate, >>> +}; >>> + >>> +static struct clk * >>> +tegra_pmc_clk_mux_register(const char *name, const char * const >>> *parent_names, >>> +               int num_parents, unsigned long flags, >>> +               unsigned long offset, u32 shift, u32 mask) >>> +{ >>> +    struct clk_init_data init; >>> +    struct pmc_clk_mux *mux; >>> + >>> +    mux = kzalloc(sizeof(*mux), GFP_KERNEL); >>> +    if (!mux) >>> +        return ERR_PTR(-ENOMEM); >>> + >>> +    init.name = name; >>> +    init.ops = &pmc_clk_mux_ops; >>> +    init.parent_names = parent_names; >>> +    init.num_parents = num_parents; >>> +    init.flags = flags; >>> + >>> +    mux->hw.init = &init; >>> +    mux->offs = offset; >>> +    mux->mask = mask; >>> +    mux->shift = shift; >>> + >>> +    return clk_register(NULL, &mux->hw); >>> +} >>> + >>> +static int pmc_clk_is_enabled(struct clk_hw *hw) >>> +{ >>> +    struct pmc_clk_gate *gate = to_pmc_clk_gate(hw); >>> + >>> +    return tegra_pmc_readl(pmc, gate->offs) & BIT(gate->shift) ? 1 : 0; >>> +} >>> + >>> +static void pmc_clk_set_state(struct clk_hw *hw, int state) >>> +{ >>> +    struct pmc_clk_gate *gate = to_pmc_clk_gate(hw); >>> +    u32 val; >>> + >>> +    val = tegra_pmc_readl(pmc, gate->offs); >>> +    val = state ? (val | BIT(gate->shift)) : (val & ~BIT(gate->shift)); >>> +    tegra_pmc_writel(pmc, val, gate->offs); >>> +    pmc_clk_fence_udelay(gate->offs); >>> +} >>> + >>> +static int pmc_clk_enable(struct clk_hw *hw) >>> +{ >>> +    pmc_clk_set_state(hw, 1); >>> + >>> +    return 0; >>> +} >>> + >>> +static void pmc_clk_disable(struct clk_hw *hw) >>> +{ >>> +    pmc_clk_set_state(hw, 0); >>> +} >>> + >>> +static const struct clk_ops pmc_clk_gate_ops = { >>> +    .is_enabled = pmc_clk_is_enabled, >>> +    .enable = pmc_clk_enable, >>> +    .disable = pmc_clk_disable, >>> +}; >>> + >>> +static struct clk * >>> +tegra_pmc_clk_gate_register(const char *name, const char *parent_name, >>> +                unsigned long flags, unsigned long offset, >>> +                u32 shift) >>> +{ >>> +    struct clk_init_data init; >>> +    struct pmc_clk_gate *gate; >>> + >>> +    gate = kzalloc(sizeof(*gate), GFP_KERNEL); >>> +    if (!gate) >>> +        return ERR_PTR(-ENOMEM); >>> + >>> +    init.name = name; >>> +    init.ops = &pmc_clk_gate_ops; >>> +    init.parent_names = &parent_name; >>> +    init.num_parents = 1; >>> +    init.flags = flags; >>> + >>> +    gate->hw.init = &init; >>> +    gate->offs = offset; >>> +    gate->shift = shift; >>> + >>> +    return clk_register(NULL, &gate->hw); >>> +} >>> + >>> +static void tegra_pmc_clock_register(struct tegra_pmc *pmc, >>> +                     struct device_node *np) >>> +{ >>> +    struct clk *clkmux, *clk, *parent; >>> +    struct clk_onecell_data *clk_data; >>> +    unsigned int num_clks; >>> +    int i, ret; >>> + >>> +    /* each pmc clock output has a mux and a gate */ >>> +    num_clks = pmc->soc->num_pmc_clks * 2; >>> + >>> +    if (!num_clks) >>> +        return; >>> + >>> +    clk_data = kmalloc(sizeof(*clk_data), GFP_KERNEL); >>> +    if (!clk_data) >>> +        return; >>> + >>> +    clk_data->clks = kcalloc(TEGRA_PMC_CLK_MAX, >>> sizeof(*clk_data->clks), >>> +                 GFP_KERNEL); >>> +    if (!clk_data->clks) >>> +        goto free_clkdata; >>> + >>> +    clk_data->clk_num = num_clks; >>> + >>> +    for (i = 0; i < pmc->soc->num_pmc_clks; i++) { >>> +        struct pmc_clk_init_data *data; >>> + >>> +        data = pmc->soc->pmc_clks_data + i; >>> + >>> +        clkmux = tegra_pmc_clk_mux_register(data->mux_name, >>> +                            data->parents, >>> +                            data->num_parents, >>> +                            CLK_SET_RATE_NO_REPARENT | >>> +                            CLK_SET_RATE_PARENT, >>> +                            PMC_CLK_OUT_CNTRL, >>> +                            data->mux_shift, 3); >>> +        if (IS_ERR(clkmux)) >>> +            goto free_clks; >>> + >>> +        clk_data->clks[data->mux_id] = clkmux; >>> + >>> +        clk = tegra_pmc_clk_gate_register(data->gate_name, >>> +                          data->mux_name, >>> +                          CLK_SET_RATE_PARENT, >>> +                          PMC_CLK_OUT_CNTRL, >>> +                          data->gate_shift); >>> +        if (IS_ERR(clk)) >>> +            goto free_clks; >>> + >>> +        clk_data->clks[data->gate_id] = clk; >>> + >>> +        ret = clk_set_parent(clk, clkmux); >>> +        if (ret < 0) { >>> +            pr_err("failed to set parent of %s to %s\n", >>> +                   __func__, __clk_get_name(clk), >>> +                   __clk_get_name(clkmux)); >>> +        } >>> + >>> +        clk_register_clkdev(clk, data->dev_name, data->gate_name); >>> + >>> +        /* configure initial clock parent and state */ >>> +        parent = clk_get_sys(data->gate_name, >>> +                     data->parents[data->init_parent_index]); >>> +        if (!IS_ERR(parent)) { >>> +            ret = clk_set_parent(clkmux, parent); >>> +            if (ret < 0) { >>> +                pr_err("failed to set parent of %s to %s\n", >>> +                       __func__, __clk_get_name(clkmux), >>> +                       __clk_get_name(parent)); >>> +                WARN_ON(1); >>> +            } >>> +        } >>> + >>> +        if (data->init_state) { >>> +            if (clk_prepare_enable(clk)) { >>> +                pr_err("failed to enable %s\n", __func__, >>> +                       __clk_get_name(clk)); >>> +                WARN_ON(1); Alternatively you could write it like this: err = clk_prepare_enable(clk); WARN_ON(err, "failed to enable %s: %d\n", __clk_get_name(clk), err); >> Should be a bit better to move the WARN_ON to the end of errors handling >> in order to catch all possible errors: >> >> @@ -2510,6 +2510,7 @@ static void tegra_pmc_clock_register(struct >> tegra_pmc *pmc, >>          return; >> >>   free_clks: >> +       WARN_ON(1); >>          kfree(clk_data->clks); >>   free_clkdata: >>          kfree(clk_data); > > Reason I had WARN_ON right during clk_set_parent failure is to have the > loop continue for subsequence pmc clocks registration instead of > terminating all pmc clocks registration. Ah, okay. Nevertheless this WARN_ON in the end shouldn't be the least (IMO).