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Subject: Re: [PATCH v2 02/11] soc: tegra: Add Tegra PMC clock registrations
 into PMC driver
To:     Sowjanya Komatineni <skomatineni@nvidia.com>,
        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>
 <484cb1bb-4fb2-9e71-87be-2bd5bd5b2348@gmail.com>
 <e4ee58aa-c421-ea4b-a37b-574fc987c7c1@nvidia.com>
 <e5da42b8-bf21-4b57-8ae6-37ce6ca4210c@gmail.com>
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 <41508376-f30b-3761-47bf-c9c87db997dc@nvidia.com>
 <348e9382-9978-0c01-1493-4226c1cd70a3@nvidia.com>
 <74ff9e90-0969-bf53-444c-d643d342d0cb@nvidia.com>
 <f9d85789-b847-ef88-dbd0-2883a45ed9c3@gmail.com>
 <474d4b95-91af-6bfb-c110-d2d232d9b522@nvidia.com>
 <0a16d627-b0e5-eb03-5aa4-ac200bf202b1@nvidia.com>
From:   Dmitry Osipenko <digetx@gmail.com>
Message-ID: <f649394b-18dc-1709-3c84-cbfb37f289f3@gmail.com>
Date:   Wed, 4 Dec 2019 23:28:09 +0300
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04.12.2019 23:08, Sowjanya Komatineni пишет:
> 
> On 12/4/19 8:02 AM, Sowjanya Komatineni wrote:
>>
>> On 12/4/19 5:39 AM, Dmitry Osipenko wrote:
>>> 03.12.2019 19:45, Sowjanya Komatineni пишет:
>>>> On 12/2/19 4:07 PM, Sowjanya Komatineni wrote:
>>>>> On 12/2/19 3:14 PM, Sowjanya Komatineni wrote:
>>>>>> On 12/2/19 3:10 PM, Sowjanya Komatineni wrote:
>>>>>>> On 12/2/19 2:58 PM, Sowjanya Komatineni wrote:
>>>>>>>> On 12/2/19 1:50 PM, Dmitry Osipenko wrote:
>>>>>>>>> 02.12.2019 23:09, Sowjanya Komatineni пишет:
>>>>>>>>>> On 11/28/19 5:25 AM, Dmitry Osipenko wrote:
>>>>>>>>>>> 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 <skomatineni@nvidia.com>
>>>>>>>>>>>>>> ---
>>>>>>>>>>>>>>      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 <linux/arm-smccc.h>
>>>>>>>>>>>>>>      #include <linux/clk.h>
>>>>>>>>>>>>>> +#include <linux/clk-provider.h>
>>>>>>>>>>>>>> +#include <linux/clkdev.h>
>>>>>>>>>>>>>> +#include <linux/clk/clk-conf.h>
>>>>>>>>>>>>>>      #include <linux/clk/tegra.h>
>>>>>>>>>>>>>>      #include <linux/debugfs.h>
>>>>>>>>>>>>>>      #include <linux/delay.h>
>>>>>>>>>>>>>> @@ -48,6 +51,7 @@
>>>>>>>>>>>>>>      #include <dt-bindings/pinctrl/pinctrl-tegra-io-pad.h>
>>>>>>>>>>>>>>      #include <dt-bindings/gpio/tegra186-gpio.h>
>>>>>>>>>>>>>>      #include <dt-bindings/gpio/tegra194-gpio.h>
>>>>>>>>>>>>>> +#include <dt-bindings/soc/tegra-pmc.h>
>>>>>>>>>>>>>>        #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]);
>>>>>>>>> Couldn't the default parent be defined using "assigned clock" in a
>>>>>>>>> device-tree? Please see "Assigned clock parents and rates" in the
>>>>>>>>> doc.
>>>>>>>>>
>>>>>>>>> https://www.kernel.org/doc/Documentation/devicetree/bindings/clock/clock-bindings.txt
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> Then you could simply use of_clk_set_defaults(pmc->dev->of_node,
>>>>>>>>> true).
>>>>>>>> Yes, of_clk_add_provider() does of_clk_set_defaults which sets
>>>>>>>> based on assigned parents and clock rates.
>>>>>>>>
>>>>>>>> This need device tree to specify assigned clock parent properties.
>>>>>>>> Will update device tree and remove init parent from the driver.
>>>>>>>>
>>>>>>> assigned-clock properties should be set in consumer node of these
>>>>>>> clocks and currently these clocks are not used yet.
>>>>>>>
>>>>>>> So will just remove init parent from driver and when these clocks
>>>>>>> are used device tree can be updated in corresponding consumer node
>>>>>>> with these properties.
>>>>>>>
>>>>>> How about default ON/OFF init state for the clocks? I see
>>>>>> assigned-clock properties for parent and rate only.
>>>>>>
>>>>>> But based on existing clock-tegra-pmc driver, I see clk_out_1 is
>>>>>> default enabled with extern1 parent for T30 thru T210 platforms.
>>>>>>
>>>>>> Peter/Thierry, What was the reason we enable clk_out_1 right from the
>>>>>> clock registration?
>>>>>>
>>>>> clk_out_1 is for audio and its not required to be enabled during the
>>>>> boot and audio driver can enable/disable it.
>>>>>
>>>>> same with blink 32khz which is used for WIFI. WIFI driver can
>>>>> enable/disable during power up/down sequence and technically as per
>>>>> design we dont need to have it always on right from the boot.
>>>>>
>>>>> So can remove out clocks init states from driver once thierry also
>>>>> agree on this.
>>>>>
>>>> Hi Dmitry,
>>>>
>>>> Looking at audio driver, it doesn't take care of mclk which is from
>>>> clk_out_1 and expects mclk to be always on.
>>>>
>>>> So probably we should have this init state enables in pmc driver for
>>>> 32Khz and clk_out's to not break existing functionality.
>>> Hello Sowjanya,
>>>
>>> IIUC, it's a bug in the device-trees and sound's MCLK actually should be
>>> set to CLK_OUT_1 of PMC instead of CaR's EXTPERIPH1. If that's the case,
>>> then the device-trees need to be fixed.
>>
>> OK, will have this in v3
> 
> Actually if we change mclk to use clk_out_1, then it will break with old
> device trees.
> 
> Currently clk_out_1 parent is set to extern1 as init state by the clock
> driver and device tree for sound node is using extern1 as mclk works and
> extern1 itself has enable and disable. But yes implementation wise, its
> incorrect as mclk should really be clk_out_1.
> 
> Now, with moving clk_out_1 to tegra PMC, pmc is the clock provider and
> if we now change the device tree to use CLK_OUT_1 as mclk then it will
> break old device tree.

There souldn't be any problem with enabling CLK_OUT_1 by the audio
driver itself (in the code) if an old device-tree is detected.

	clk_out_1 = clk_get(dev, "clk_out_1");
	clk_set_parent(clk_out_1, clk_extern1);
	...
	data->clk_cdev1 = clk_out_1;

Maybe it will be even better to compare clocks for detection of an older DT:

	if (tegra_get_chip_id() > TEGRA20 &&
	    clk_is_match(data->clk_cdev1, clk_extern1)) {
	...

>>>> Regarding using assigned-clock properties for init parent and removing
>>>> init parent from driver, it also needs consumer node in device tree to
>>>> be updated to specify assigned-clock properties for default/init
>>>> parent.
>>>>
>>>> This breaks device tree ABI as prior Tegra210 supports audio driver.
>>> So it's the sound node which should have had the assigned clocks in
>>> device-tree in order to define route for the audio MCLK clock from CaR
>>> to PMC.
>>>
>>> Given that the audio clocks configuration is the same for all of the
>>> currently supported boards, I think it will be better to remove the
>>> entire audio clocks initialization from the clk drivers and move it all
>>> to the audio driver. It could be something like this:
>>>
>>> int tegra_asoc_utils_init(struct tegra_asoc_utils_data *data,
>>>               struct device *dev)
>>> {
>>>     ...
>>>
>>>     if (!of_find_property(dev->of_node, "assigned-clock-parents",
>>> NULL) &&
>>>         tegra_get_chip_id() > TEGRA20) {
>>>         clk_extern1 = clk_get(dev, "extern1");
>>>         ...
>>>         clk_set_parent(clk_extern1, clk_pll_a_out0);
>>>         ...
>>>         clk_put(data->clk_cdev1);
>>>
>>>         data->clk_cdev1 = clk_out_1;
>>>     }
>>>     ...
>>>
>>> So now the old device-trees will cointinue to work and new could have
>>> the assigned-clocks and set MCLK to CLK_OUT_1.
>>>
>>> [snip]
>>
>> Will update clk-tegra, pmc and audio driver to move init state
>> configuration for extern1 and clk_out_1 into audio driver and will use
>> assigned clock properties in device tree.
>>