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

[Sowjanya Komatineni <skomatineni@nvidia.com>]

On 12/4/19 1:12 PM, Dmitry Osipenko wrote:
> 04.12.2019 23:33, Sowjanya Komatineni пишет:
>> On 12/4/19 12:28 PM, Dmitry Osipenko wrote:
>>> 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)) {
>>>      ...
>>>
>> we can do parent init in audio driver which is not an issue.
>>
>> But I was saying we can keep extern1 as mclk in device tree instead of
>> changing to clk_out_1 from pmc as it will break old device tree becasue
>> we moved clk_out_1 from clock driver to pmc driver.
>>
>> once we do init parent in audio driver, we still can use extern1 as mclk
>> in device tree.
>>
>> mclk -> clk_out_1 -> extern1 -> plla_out0 -> plla
>>
>> with init of clk_out_1 parent to extern1, mclk can use extern1 handle
>> for rate/enable/disable clk operations
> It should be okay to fallback to extern1 for a backwards compatibility
> of the new DT with older kernels.
>
> @@ -192,8 +192,14 @@ int tegra_asoc_utils_init(struct
> tegra_asoc_utils_data *data,
>          data->clk_cdev1 = clk_get(dev, "mclk");
>          if (IS_ERR(data->clk_cdev1)) {
>                  dev_err(data->dev, "Can't retrieve clk cdev1\n");
> -               ret = PTR_ERR(data->clk_cdev1);
> -               goto err_put_pll_a_out0;
> +
> +               data->clk_cdev1 = clk_get_sys("clk_out_1", "extern1");
> +               if (IS_ERR(data->clk_cdev1)) {
> +                       ret = PTR_ERR(data->clk_cdev1);
> +                       goto err_put_pll_a_out0;
> +               }
> +
> +               dev_err(data->dev, "Falling back to extern1\n");
>          }
>
>          ret = tegra_asoc_utils_set_rate(data, 44100, 256 * 44100);
>
> This change should be a standalone patch and it should be requsted for
> backporting into stable kernels.

ok will add fallback. yes will request this patch for backporting.

Thanks dmitry.

>>>>>>> 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.
>>>>>