linux-kernel - Re: [PATCH v6 06/19] soc: tegra: Add Tegra PMC clocks registration into PMC driver

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Date:   Tue, 7 Jan 2020 17:13:41 -0800
From:   Sowjanya Komatineni <skomatineni@...dia.com>
To:     Dmitry Osipenko <digetx@...il.com>, <thierry.reding@...il.com>,
        <jonathanh@...dia.com>, <broonie@...nel.org>,
        <lgirdwood@...il.com>, <perex@...ex.cz>, <tiwai@...e.com>,
        <mperttunen@...dia.com>, <gregkh@...uxfoundation.org>,
        <sboyd@...nel.org>, <robh+dt@...nel.org>, <mark.rutland@....com>
CC:     <pdeschrijver@...dia.com>, <pgaikwad@...dia.com>,
        <spujar@...dia.com>, <josephl@...dia.com>,
        <daniel.lezcano@...aro.org>, <mmaddireddy@...dia.com>,
        <markz@...dia.com>, <devicetree@...r.kernel.org>,
        <linux-clk@...r.kernel.org>, <linux-tegra@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v6 06/19] soc: tegra: Add Tegra PMC clocks registration
 into PMC driver


On 1/7/20 5:00 PM, Dmitry Osipenko wrote:
> 07.01.2020 07:14, Sowjanya Komatineni пишет:
>> Tegra PMC has clk_out_1, clk_out_2, and clk_out_3 clocks and currently
>> these PMC clocks are registered by Tegra clock driver with each clock as
>> separate mux and gate clocks 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 PMC clocks registration to pmc driver with PMC as
>> a clock provider and registers each clock as single clock.
>>
>> clk_ops callback implementations for these clocks uses tegra_pmc_readl and
>> tegra_pmc_writel which supports PMC programming in both secure mode and
>> non-secure mode.
>>
>> Signed-off-by: Sowjanya Komatineni <skomatineni@...dia.com>
>> ---
>>   drivers/soc/tegra/pmc.c | 242 ++++++++++++++++++++++++++++++++++++++++++++++++
>>   1 file changed, 242 insertions(+)
>>
>> diff --git a/drivers/soc/tegra/pmc.c b/drivers/soc/tegra/pmc.c
>> index 1699dda6b393..2b1a709c3cb7 100644
>> --- a/drivers/soc/tegra/pmc.c
>> +++ b/drivers/soc/tegra/pmc.c
>> @@ -13,9 +13,13 @@
>>   
>>   #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>
>> +#include <linux/device.h>
>>   #include <linux/err.h>
>>   #include <linux/export.h>
>>   #include <linux/init.h>
>> @@ -48,6 +52,7 @@
>>   #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 +105,8 @@
>>   #define PMC_WAKE2_STATUS		0x168
>>   #define PMC_SW_WAKE2_STATUS		0x16c
>>   
>> +#define PMC_CLK_OUT_CNTRL		0x1a8
>> +#define  PMC_CLK_OUT_MUX_MASK		GENMASK(1, 0)
>>   #define PMC_SENSOR_CTRL			0x1b0
>>   #define  PMC_SENSOR_CTRL_SCRATCH_WRITE	BIT(2)
>>   #define  PMC_SENSOR_CTRL_ENABLE_RST	BIT(1)
>> @@ -155,6 +162,63 @@
>>   #define  TEGRA_SMC_PMC_READ	0xaa
>>   #define  TEGRA_SMC_PMC_WRITE	0xbb
>>   
>> +struct pmc_clk {
>> +	struct clk_hw	hw;
>> +	unsigned long	offs;
>> +	u32		mux_shift;
>> +	u32		force_en_shift;
>> +};
>> +
>> +#define to_pmc_clk(_hw) container_of(_hw, struct pmc_clk, hw)
>> +
>> +struct pmc_clk_init_data {
>> +	char *name;
>> +	const char *const *parents;
>> +	int num_parents;
>> +	int clk_id;
>> +	u8 mux_shift;
>> +	u8 force_en_shift;
>> +};
>> +
>> +static const char * const clk_out1_parents[] = { "osc", "osc_div2",
>> +	"osc_div4", "extern1",
>> +};
>> +
>> +static const char * const clk_out2_parents[] = { "osc", "osc_div2",
>> +	"osc_div4", "extern2",
>> +};
>> +
>> +static const char * const clk_out3_parents[] = { "osc", "osc_div2",
>> +	"osc_div4", "extern3",
>> +};
> There is no way to specify "osc" as a parent clock in a device-tree
> because there is no DT ID assigned to the OSC in the CaR driver, should
> this be fixed?
Yes, we need DT ID for OSC. Will add.