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Subject: Re: [PATCH v1 06/17] soc: pmc: Add blink output clock registration to
 Tegra PMC
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: <1574146234-3871-1-git-send-email-skomatineni@nvidia.com>
 <1574146234-3871-7-git-send-email-skomatineni@nvidia.com>
From:   Dmitry Osipenko <digetx@gmail.com>
Message-ID: <95f3e928-3e08-abbd-5617-d3570a592c06@gmail.com>
Date:   Tue, 19 Nov 2019 22:34:12 +0300
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19.11.2019 09:50, Sowjanya Komatineni пишет:
> Tegra PMC has blink control to output 32 Khz clock out to Tegra
> blink pin. Blink pad DPD state and enable controls are part of
> Tegra PMC register space.
> 
> Currently Tegra clock driver registers blink control by passing
> PMC address and register offset to clk_register_gate which performs
> direct PMC access during clk_ops and with this when PMC is in secure
> mode, any access from non-secure world does not go through.
> 
> This patch adds blink control registration to the Tegra PMC driver
> using PMC specific clock gate operations that use tegra_pmc_readl
> and tegra_pmc_writel to support both secure mode and non-secure
> mode PMC register access.
> 
> Signed-off-by: Sowjanya Komatineni <skomatineni@nvidia.com>
> ---
>  drivers/soc/tegra/pmc.c | 42 ++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 42 insertions(+)
> 
> diff --git a/drivers/soc/tegra/pmc.c b/drivers/soc/tegra/pmc.c
> index 790a6619ba32..095e89c7fa3f 100644
> --- a/drivers/soc/tegra/pmc.c
> +++ b/drivers/soc/tegra/pmc.c
> @@ -61,12 +61,15 @@
>  #define  PMC_CNTRL_SYSCLK_OE		BIT(11) /* system clock enable */
>  #define  PMC_CNTRL_SYSCLK_POLARITY	BIT(10) /* sys clk polarity */
>  #define  PMC_CNTRL_PWRREQ_POLARITY	BIT(8)
> +#define  PMC_CNTRL_BLINK_EN		BIT(7)
>  #define  PMC_CNTRL_MAIN_RST		BIT(4)
>  
>  #define PMC_WAKE_MASK			0x0c
>  #define PMC_WAKE_LEVEL			0x10
>  #define PMC_WAKE_STATUS			0x14
>  #define PMC_SW_WAKE_STATUS		0x18
> +#define PMC_DPD_PADS_ORIDE		0x1c
> +#define  PMC_DPD_PADS_ORIDE_BLINK	BIT(20)
>  
>  #define DPD_SAMPLE			0x020
>  #define  DPD_SAMPLE_ENABLE		BIT(0)
> @@ -79,6 +82,7 @@
>  
>  #define PWRGATE_STATUS			0x38
>  
> +#define TEGRA210_PMC_BLINK_TIMER	0x40
>  #define PMC_IMPL_E_33V_PWR		0x40
>  
>  #define PMC_PWR_DET			0x48
> @@ -247,6 +251,9 @@ static struct pmc_clk_init_data tegra_pmc_clks_data[] = {
>  	PMC_CLK(3, 22, 18, 0, 0),
>  };
>  
> +static struct pmc_clk_gate blink_override;
> +static struct pmc_clk_gate blink;
> +
>  struct tegra_powergate {
>  	struct generic_pm_domain genpd;
>  	struct tegra_pmc *pmc;
> @@ -359,6 +366,7 @@ struct tegra_pmc_soc {
>  
>  	struct pmc_clk_init_data *pmc_clks_data;
>  	unsigned int num_pmc_clks;
> +	bool has_blink_output;
>  };
>  
>  static const char * const tegra186_reset_sources[] = {
> @@ -2530,6 +2538,9 @@ static void tegra_pmc_clock_register(struct tegra_pmc *pmc,
>  	/* each pmc clock output has a mux and a gate */
>  	num_clks = pmc->soc->num_pmc_clks * 2;
>  
> +	if (pmc->soc->has_blink_output)
> +		num_clks += 1;
> +
>  	if (!num_clks)
>  		return;
>  
> @@ -2604,6 +2615,30 @@ static void tegra_pmc_clock_register(struct tegra_pmc *pmc,
>  		}
>  	}
>  
> +	if (pmc->soc->has_blink_output) {
> +		tegra_pmc_writel(pmc, 0x0, TEGRA210_PMC_BLINK_TIMER);
> +		clkgate = tegra_pmc_clk_gate_register("blink_override",
> +						      "clk_32k",
> +						      0, &blink_override,
> +					      PMC_DPD_PADS_ORIDE,
> +						      PMC_DPD_PADS_ORIDE_BLINK,
> +						      NULL);
> +		if (IS_ERR(clkgate))
> +			goto free_clks;
> +
> +		clkgate = tegra_pmc_clk_gate_register("blink",
> +						      "blink_override",
> +						      0, &blink,
> +						      PMC_CNTRL,
> +						      PMC_CNTRL_BLINK_EN,
> +						      NULL);
> +		if (IS_ERR(clkgate))
> +			goto free_clks;
> +
> +		clk_data->clks[TEGRA_PMC_CLK_BLINK] = clkgate;
> +		clk_register_clkdev(clkgate, "blink", NULL);

Tegra20 has pmc->soc->num_pmc_clks = 0 and thus num_clks = 1, while
TEGRA_PMC_CLK_BLINK = 6.

BTW, Tegra30 doesn't boot. I'll try again v2.

Please fix it all in v2. Compile-test all patches and make at least a
boot-test where possible.

[snip]