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Date:   Mon, 27 Feb 2017 20:27:33 +0200
From:   Mikko Perttunen <cyndis@...si.fi>
To:     Peter De Schrijver <pdeschrijver@...dia.com>,
        Prashant Gaikwad <pgaikwad@...dia.com>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...eaurora.org>,
        Stephen Warren <swarren@...dotorg.org>,
        Thierry Reding <thierry.reding@...il.com>,
        Alexandre Courbot <gnurou@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Rhyland Klein <rklein@...dia.com>, linux-clk@...r.kernel.org,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH 2/5] clk: tegra: define Tegra210 DMIC sync clocks

On 02/23/2017 02:39 PM, Peter De Schrijver wrote:
> Tegra210 has 3 DMIC inputs which can be clocked from the recovered clock
> of several other audio inputs (eg. i2s0, i2s1, ...). To model this, we add
> a 3 new clocks similar to the audio* clocks which handle the same function
> for the i2s and spdif clocks.
>
> Signed-off-by: Peter De Schrijver <pdeschrijver@...dia.com>
> ---
>  drivers/clk/tegra/clk-id.h               |  8 ++-
>  drivers/clk/tegra/clk-tegra-audio.c      | 85 +++++++++++++++++++++++---------
>  drivers/clk/tegra/clk-tegra210.c         |  6 +++
>  include/dt-bindings/clock/tegra210-car.h |  9 +++-
>  4 files changed, 82 insertions(+), 26 deletions(-)
>
> diff --git a/drivers/clk/tegra/clk-id.h b/drivers/clk/tegra/clk-id.h
> index fc978b2..ab9b347 100644
> --- a/drivers/clk/tegra/clk-id.h
> +++ b/drivers/clk/tegra/clk-id.h
> @@ -307,8 +307,14 @@ enum clk_id {
>  	tegra_clk_xusb_ssp_src,
>  	tegra_clk_sclk_mux,
>  	tegra_clk_sor_safe,
> -	tegra_clk_ispa,
>  	tegra_clk_cec,
> +	tegra_clk_ispa,
> +	tegra_clk_dmic1_sync_clk,
> +	tegra_clk_dmic2_sync_clk,
> +	tegra_clk_dmic3_sync_clk,
> +	tegra_clk_dmic1_sync_clk_mux,
> +	tegra_clk_dmic2_sync_clk_mux,
> +	tegra_clk_dmic3_sync_clk_mux,
>  	tegra_clk_max,
>  };
>
> diff --git a/drivers/clk/tegra/clk-tegra-audio.c b/drivers/clk/tegra/clk-tegra-audio.c
> index e2bfa9b..b4da6e0 100644
> --- a/drivers/clk/tegra/clk-tegra-audio.c
> +++ b/drivers/clk/tegra/clk-tegra-audio.c
> @@ -31,6 +31,9 @@
>  #define AUDIO_SYNC_CLK_I2S3 0x4ac
>  #define AUDIO_SYNC_CLK_I2S4 0x4b0
>  #define AUDIO_SYNC_CLK_SPDIF 0x4b4
> +#define AUDIO_SYNC_CLK_DMIC1 0x560
> +#define AUDIO_SYNC_CLK_DMIC2 0x564
> +#define AUDIO_SYNC_CLK_DMIC3 0x6b8
>
>  #define AUDIO_SYNC_DOUBLER 0x49c
>
> @@ -91,8 +94,14 @@ struct tegra_audio2x_clk_initdata {
>
>  static DEFINE_SPINLOCK(clk_doubler_lock);
>
> -static const char *mux_audio_sync_clk[] = { "spdif_in_sync", "i2s0_sync",
> -	"i2s1_sync", "i2s2_sync", "i2s3_sync", "i2s4_sync", "vimclk_sync",
> +static const char * const mux_audio_sync_clk[] = { "spdif_in_sync",
> +	"i2s0_sync", "i2s1_sync", "i2s2_sync", "i2s3_sync", "i2s4_sync",
> +	"pll_a_out0", "vimclk_sync",
> +};
> +
> +static const char * const mux_dmic_sync_clk[] = { "unused", "i2s0_sync",
> +	"i2s1_sync", "i2s2_sync", "i2s3_sync", "i2s4_sync", "pll_a_out0",
> +	"vimclk_sync",
>  };

My GCC spews a bunch of warnings because these are "const char * const" 
and are passed to tegra_audio_sync_clk_init which takes "const char **". 
Similarly for mux_dmic[123] which end up in a struct 
tegra_periph_init_data which also has a "const char **" field; and 
finally aclk_parents has the same issue.

Apart from that, the series:

Reviewed-by: Mikko Perttunen <mperttunen@...dia.com>
Tested-by: Mikko Perttunen <mperttunen@...dia.com>
(booted and verified clocks show up)

>
>  static struct tegra_sync_source_initdata sync_source_clks[] __initdata = {
> @@ -114,6 +123,12 @@ struct tegra_audio2x_clk_initdata {
>  	AUDIO(spdif, AUDIO_SYNC_CLK_SPDIF),
>  };
>
> +static struct tegra_audio_clk_initdata dmic_clks[] = {
> +	AUDIO(dmic1_sync_clk, AUDIO_SYNC_CLK_DMIC1),
> +	AUDIO(dmic2_sync_clk, AUDIO_SYNC_CLK_DMIC2),
> +	AUDIO(dmic3_sync_clk, AUDIO_SYNC_CLK_DMIC3),
> +};
> +
>  static struct tegra_audio2x_clk_initdata audio2x_clks[] = {
>  	AUDIO2X(audio0, 113, 24),
>  	AUDIO2X(audio1, 114, 25),
> @@ -123,6 +138,41 @@ struct tegra_audio2x_clk_initdata {
>  	AUDIO2X(spdif, 118, 29),
>  };
>
> +static void __init tegra_audio_sync_clk_init(void __iomem *clk_base,
> +				      struct tegra_clk *tegra_clks,
> +				      struct tegra_audio_clk_initdata *sync,
> +				      int num_sync_clks,
> +				      const char **mux_names,
> +				      int num_mux_inputs)
> +{
> +	struct clk *clk;
> +	struct clk **dt_clk;
> +	struct tegra_audio_clk_initdata *data;
> +	int i;
> +
> +	for (i = 0, data = sync; i < num_sync_clks; i++, data++) {
> +		dt_clk = tegra_lookup_dt_id(data->mux_clk_id, tegra_clks);
> +		if (!dt_clk)
> +			continue;
> +
> +		clk = clk_register_mux(NULL, data->mux_name, mux_names,
> +					num_mux_inputs,
> +					CLK_SET_RATE_NO_REPARENT,
> +					clk_base + data->offset, 0, 3, 0,
> +					NULL);
> +		*dt_clk = clk;
> +
> +		dt_clk = tegra_lookup_dt_id(data->gate_clk_id, tegra_clks);
> +		if (!dt_clk)
> +			continue;
> +
> +		clk = clk_register_gate(NULL, data->gate_name, data->mux_name,
> +					0, clk_base + data->offset, 4,
> +					CLK_GATE_SET_TO_DISABLE, NULL);
> +		*dt_clk = clk;
> +	}
> +}
> +
>  void __init tegra_audio_clk_init(void __iomem *clk_base,
>  			void __iomem *pmc_base, struct tegra_clk *tegra_clks,
>  			struct tegra_audio_clk_info *audio_info,
> @@ -176,30 +226,17 @@ void __init tegra_audio_clk_init(void __iomem *clk_base,
>  		*dt_clk = clk;
>  	}
>
> -	for (i = 0; i < ARRAY_SIZE(audio_clks); i++) {
> -		struct tegra_audio_clk_initdata *data;
> +	tegra_audio_sync_clk_init(clk_base, tegra_clks, audio_clks,
> +				  ARRAY_SIZE(audio_clks), mux_audio_sync_clk,
> +				  ARRAY_SIZE(mux_audio_sync_clk));
>
> -		data = &audio_clks[i];
> -		dt_clk = tegra_lookup_dt_id(data->mux_clk_id, tegra_clks);
> +	/* make sure the DMIC sync clocks have a valid parent */
> +	for (i = 0; i < ARRAY_SIZE(dmic_clks); i++)
> +		writel_relaxed(1, clk_base + dmic_clks[i].offset);
>
> -		if (!dt_clk)
> -			continue;
> -		clk = clk_register_mux(NULL, data->mux_name, mux_audio_sync_clk,
> -					ARRAY_SIZE(mux_audio_sync_clk),
> -					CLK_SET_RATE_NO_REPARENT,
> -					clk_base + data->offset, 0, 3, 0,
> -					NULL);
> -		*dt_clk = clk;
> -
> -		dt_clk = tegra_lookup_dt_id(data->gate_clk_id, tegra_clks);
> -		if (!dt_clk)
> -			continue;
> -
> -		clk = clk_register_gate(NULL, data->gate_name, data->mux_name,
> -					0, clk_base + data->offset, 4,
> -					CLK_GATE_SET_TO_DISABLE, NULL);
> -		*dt_clk = clk;
> -	}
> +	tegra_audio_sync_clk_init(clk_base, tegra_clks, dmic_clks,
> +				  ARRAY_SIZE(dmic_clks), mux_dmic_sync_clk,
> +				  ARRAY_SIZE(mux_dmic_sync_clk));
>
>  	for (i = 0; i < ARRAY_SIZE(audio2x_clks); i++) {
>  		struct tegra_audio2x_clk_initdata *data;
> diff --git a/drivers/clk/tegra/clk-tegra210.c b/drivers/clk/tegra/clk-tegra210.c
> index bdb296a..ca63901 100644
> --- a/drivers/clk/tegra/clk-tegra210.c
> +++ b/drivers/clk/tegra/clk-tegra210.c
> @@ -2223,6 +2223,12 @@ static u32 pll_expo_p_to_pdiv(u32 p, u32 *pdiv)
>  	[tegra_clk_pll_a1] = { .dt_id = TEGRA210_CLK_PLL_A1, .present = true },
>  	[tegra_clk_ispa] = { .dt_id = TEGRA210_CLK_ISPA, .present = true },
>  	[tegra_clk_cec] = { .dt_id = TEGRA210_CLK_CEC, .present = true },
> +	[tegra_clk_dmic1_sync_clk] = { .dt_id = TEGRA210_CLK_DMIC1_SYNC_CLK, .present = true },
> +	[tegra_clk_dmic2_sync_clk] = { .dt_id = TEGRA210_CLK_DMIC2_SYNC_CLK, .present = true },
> +	[tegra_clk_dmic3_sync_clk] = { .dt_id = TEGRA210_CLK_DMIC3_SYNC_CLK, .present = true },
> +	[tegra_clk_dmic1_sync_clk_mux] = { .dt_id = TEGRA210_CLK_DMIC1_SYNC_CLK_MUX, .present = true },
> +	[tegra_clk_dmic2_sync_clk_mux] = { .dt_id = TEGRA210_CLK_DMIC2_SYNC_CLK_MUX, .present = true },
> +	[tegra_clk_dmic3_sync_clk_mux] = { .dt_id = TEGRA210_CLK_DMIC3_SYNC_CLK_MUX, .present = true },
>  };
>
>  static struct tegra_devclk devclks[] __initdata = {
> diff --git a/include/dt-bindings/clock/tegra210-car.h b/include/dt-bindings/clock/tegra210-car.h
> index e7a2578..5aa1027 100644
> --- a/include/dt-bindings/clock/tegra210-car.h
> +++ b/include/dt-bindings/clock/tegra210-car.h
> @@ -396,6 +396,13 @@
>  #define TEGRA210_CLK_PLL_C_UD 364
>  #define TEGRA210_CLK_SCLK_MUX 365
>
> -#define TEGRA210_CLK_CLK_MAX 366
> +#define TEGRA210_CLK_DMIC1_SYNC_CLK 388
> +#define TEGRA210_CLK_DMIC1_SYNC_CLK_MUX 389
> +#define TEGRA210_CLK_DMIC2_SYNC_CLK 390
> +#define TEGRA210_CLK_DMIC2_SYNC_CLK_MUX 391
> +#define TEGRA210_CLK_DMIC3_SYNC_CLK 392
> +#define TEGRA210_CLK_DMIC3_SYNC_CLK_MUX 393
> +
> +#define TEGRA210_CLK_CLK_MAX 394
>
>  #endif	/* _DT_BINDINGS_CLOCK_TEGRA210_CAR_H */
>

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