Re: [PATCH v2 02/11] soc: tegra: Add Tegra PMC clock registrations into PMC driver

[Sowjanya Komatineni <skomatineni@nvidia.com>]

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

>> 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.