[PATCH v3 01/22] clk: tegra: set CSUS as vi_sensor's gate for Tegra20, Tegra30 and Tegra114

Svyatoslav Ryhel posted 22 patches 6 days, 9 hours ago
[PATCH v3 01/22] clk: tegra: set CSUS as vi_sensor's gate for Tegra20, Tegra30 and Tegra114
Posted by Svyatoslav Ryhel 6 days, 9 hours ago
The CSUS clock is a clock gate for the output clock signal primarily
sourced from the VI_SENSOR clock. This clock signal is used as an input
MCLK clock for cameras.

Unlike later Tegra SoCs, the Tegra 20 can change its CSUS parent, which is
why csus_mux is added in a similar way to how CDEV1 and CDEV2 are handled.

Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
---
 drivers/clk/tegra/clk-tegra114.c        |  7 ++++++-
 drivers/clk/tegra/clk-tegra20.c         | 20 +++++++++++++-------
 drivers/clk/tegra/clk-tegra30.c         |  7 ++++++-
 drivers/pinctrl/tegra/pinctrl-tegra20.c |  7 +++++++
 4 files changed, 32 insertions(+), 9 deletions(-)

diff --git a/drivers/clk/tegra/clk-tegra114.c b/drivers/clk/tegra/clk-tegra114.c
index 186b0b81c1ec..00282b0d3763 100644
--- a/drivers/clk/tegra/clk-tegra114.c
+++ b/drivers/clk/tegra/clk-tegra114.c
@@ -691,7 +691,6 @@ static struct tegra_clk tegra114_clks[tegra_clk_max] __initdata = {
 	[tegra_clk_tsec] = { .dt_id = TEGRA114_CLK_TSEC, .present = true },
 	[tegra_clk_xusb_host] = { .dt_id = TEGRA114_CLK_XUSB_HOST, .present = true },
 	[tegra_clk_msenc] = { .dt_id = TEGRA114_CLK_MSENC, .present = true },
-	[tegra_clk_csus] = { .dt_id = TEGRA114_CLK_CSUS, .present = true },
 	[tegra_clk_mselect] = { .dt_id = TEGRA114_CLK_MSELECT, .present = true },
 	[tegra_clk_tsensor] = { .dt_id = TEGRA114_CLK_TSENSOR, .present = true },
 	[tegra_clk_i2s3] = { .dt_id = TEGRA114_CLK_I2S3, .present = true },
@@ -1047,6 +1046,12 @@ static __init void tegra114_periph_clk_init(void __iomem *clk_base,
 					     0, 82, periph_clk_enb_refcnt);
 	clks[TEGRA114_CLK_DSIB] = clk;
 
+	/* csus */
+	clk = tegra_clk_register_periph_gate("csus", "vi_sensor", 0,
+					     clk_base, 0, TEGRA114_CLK_CSUS,
+					     periph_clk_enb_refcnt);
+	clks[TEGRA114_CLK_CSUS] = clk;
+
 	/* emc mux */
 	clk = clk_register_mux(NULL, "emc_mux", mux_pllmcp_clkm,
 			       ARRAY_SIZE(mux_pllmcp_clkm),
diff --git a/drivers/clk/tegra/clk-tegra20.c b/drivers/clk/tegra/clk-tegra20.c
index 2c58ce25af75..d8d5afeb6f9b 100644
--- a/drivers/clk/tegra/clk-tegra20.c
+++ b/drivers/clk/tegra/clk-tegra20.c
@@ -530,7 +530,6 @@ static struct tegra_clk tegra20_clks[tegra_clk_max] __initdata = {
 	[tegra_clk_rtc] = { .dt_id = TEGRA20_CLK_RTC, .present = true },
 	[tegra_clk_timer] = { .dt_id = TEGRA20_CLK_TIMER, .present = true },
 	[tegra_clk_kbc] = { .dt_id = TEGRA20_CLK_KBC, .present = true },
-	[tegra_clk_csus] = { .dt_id = TEGRA20_CLK_CSUS, .present = true },
 	[tegra_clk_vcp] = { .dt_id = TEGRA20_CLK_VCP, .present = true },
 	[tegra_clk_bsea] = { .dt_id = TEGRA20_CLK_BSEA, .present = true },
 	[tegra_clk_bsev] = { .dt_id = TEGRA20_CLK_BSEV, .present = true },
@@ -834,6 +833,12 @@ static void __init tegra20_periph_clk_init(void)
 				    clk_base, 0, 93, periph_clk_enb_refcnt);
 	clks[TEGRA20_CLK_CDEV2] = clk;
 
+	/* csus */
+	clk = tegra_clk_register_periph_gate("csus", "csus_mux", 0,
+					     clk_base, 0, TEGRA20_CLK_CSUS,
+					     periph_clk_enb_refcnt);
+	clks[TEGRA20_CLK_CSUS] = clk;
+
 	for (i = 0; i < ARRAY_SIZE(tegra_periph_clk_list); i++) {
 		data = &tegra_periph_clk_list[i];
 		clk = tegra_clk_register_periph_data(clk_base, data);
@@ -1093,14 +1098,15 @@ static struct clk *tegra20_clk_src_onecell_get(struct of_phandle_args *clkspec,
 	hw = __clk_get_hw(clk);
 
 	/*
-	 * Tegra20 CDEV1 and CDEV2 clocks are a bit special case, their parent
-	 * clock is created by the pinctrl driver. It is possible for clk user
-	 * to request these clocks before pinctrl driver got probed and hence
-	 * user will get an orphaned clock. That might be undesirable because
-	 * user may expect parent clock to be enabled by the child.
+	 * Tegra20 CDEV1, CDEV2 and CSUS clocks are a bit special case, their
+	 * parent clock is created by the pinctrl driver. It is possible for
+	 * clk user to request these clocks before pinctrl driver got probed
+	 * and hence user will get an orphaned clock. That might be undesirable
+	 * because user may expect parent clock to be enabled by the child.
 	 */
 	if (clkspec->args[0] == TEGRA20_CLK_CDEV1 ||
-	    clkspec->args[0] == TEGRA20_CLK_CDEV2) {
+	    clkspec->args[0] == TEGRA20_CLK_CDEV2 ||
+	    clkspec->args[0] == TEGRA20_CLK_CSUS) {
 		parent_hw = clk_hw_get_parent(hw);
 		if (!parent_hw)
 			return ERR_PTR(-EPROBE_DEFER);
diff --git a/drivers/clk/tegra/clk-tegra30.c b/drivers/clk/tegra/clk-tegra30.c
index 82a8cb9545eb..ca367184e185 100644
--- a/drivers/clk/tegra/clk-tegra30.c
+++ b/drivers/clk/tegra/clk-tegra30.c
@@ -779,7 +779,6 @@ static struct tegra_clk tegra30_clks[tegra_clk_max] __initdata = {
 	[tegra_clk_rtc] = { .dt_id = TEGRA30_CLK_RTC, .present = true },
 	[tegra_clk_timer] = { .dt_id = TEGRA30_CLK_TIMER, .present = true },
 	[tegra_clk_kbc] = { .dt_id = TEGRA30_CLK_KBC, .present = true },
-	[tegra_clk_csus] = { .dt_id = TEGRA30_CLK_CSUS, .present = true },
 	[tegra_clk_vcp] = { .dt_id = TEGRA30_CLK_VCP, .present = true },
 	[tegra_clk_bsea] = { .dt_id = TEGRA30_CLK_BSEA, .present = true },
 	[tegra_clk_bsev] = { .dt_id = TEGRA30_CLK_BSEV, .present = true },
@@ -1008,6 +1007,12 @@ static void __init tegra30_periph_clk_init(void)
 				    0, 48, periph_clk_enb_refcnt);
 	clks[TEGRA30_CLK_DSIA] = clk;
 
+	/* csus */
+	clk = tegra_clk_register_periph_gate("csus", "vi_sensor", 0,
+					     clk_base, 0, TEGRA30_CLK_CSUS,
+					     periph_clk_enb_refcnt);
+	clks[TEGRA30_CLK_CSUS] = clk;
+
 	/* pcie */
 	clk = tegra_clk_register_periph_gate("pcie", "clk_m", 0, clk_base, 0,
 				    70, periph_clk_enb_refcnt);
diff --git a/drivers/pinctrl/tegra/pinctrl-tegra20.c b/drivers/pinctrl/tegra/pinctrl-tegra20.c
index 737fc2000f66..437e0ac091cc 100644
--- a/drivers/pinctrl/tegra/pinctrl-tegra20.c
+++ b/drivers/pinctrl/tegra/pinctrl-tegra20.c
@@ -2230,6 +2230,10 @@ static const char *cdev2_parents[] = {
 	"dev2_osc_div", "hclk", "pclk", "pll_p_out4",
 };
 
+static const char *csus_parents[] = {
+	"pll_c_out1", "pll_p_out2", "pll_p_out3", "vi_sensor",
+};
+
 static void tegra20_pinctrl_register_clock_muxes(struct platform_device *pdev)
 {
 	struct tegra_pmx *pmx = platform_get_drvdata(pdev);
@@ -2239,6 +2243,9 @@ static void tegra20_pinctrl_register_clock_muxes(struct platform_device *pdev)
 
 	clk_register_mux(NULL, "cdev2_mux", cdev2_parents, 4, 0,
 			 pmx->regs[1] + 0x8, 4, 2, CLK_MUX_READ_ONLY, NULL);
+
+	clk_register_mux(NULL, "csus_mux", csus_parents, 4, 0,
+			 pmx->regs[1] + 0x8, 6, 2, CLK_MUX_READ_ONLY, NULL);
 }
 
 static int tegra20_pinctrl_probe(struct platform_device *pdev)
-- 
2.48.1
Re: [PATCH v3 01/22] clk: tegra: set CSUS as vi_sensor's gate for Tegra20, Tegra30 and Tegra114
Posted by Mikko Perttunen 20 hours ago
On Friday, September 26, 2025 12:16 AM Svyatoslav Ryhel wrote:
> The CSUS clock is a clock gate for the output clock signal primarily
> sourced from the VI_SENSOR clock. This clock signal is used as an input
> MCLK clock for cameras.
> 
> Unlike later Tegra SoCs, the Tegra 20 can change its CSUS parent, which is
> why csus_mux is added in a similar way to how CDEV1 and CDEV2 are handled.
> 
> Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
> ---
>  drivers/clk/tegra/clk-tegra114.c        |  7 ++++++-
>  drivers/clk/tegra/clk-tegra20.c         | 20 +++++++++++++-------
>  drivers/clk/tegra/clk-tegra30.c         |  7 ++++++-
>  drivers/pinctrl/tegra/pinctrl-tegra20.c |  7 +++++++
>  4 files changed, 32 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/clk/tegra/clk-tegra114.c b/drivers/clk/tegra/clk-tegra114.c
> index 186b0b81c1ec..00282b0d3763 100644
> --- a/drivers/clk/tegra/clk-tegra114.c
> +++ b/drivers/clk/tegra/clk-tegra114.c
> @@ -691,7 +691,6 @@ static struct tegra_clk tegra114_clks[tegra_clk_max] __initdata = {
>  	[tegra_clk_tsec] = { .dt_id = TEGRA114_CLK_TSEC, .present = true },
>  	[tegra_clk_xusb_host] = { .dt_id = TEGRA114_CLK_XUSB_HOST, .present = true },
>  	[tegra_clk_msenc] = { .dt_id = TEGRA114_CLK_MSENC, .present = true },
> -	[tegra_clk_csus] = { .dt_id = TEGRA114_CLK_CSUS, .present = true },
>  	[tegra_clk_mselect] = { .dt_id = TEGRA114_CLK_MSELECT, .present = true },
>  	[tegra_clk_tsensor] = { .dt_id = TEGRA114_CLK_TSENSOR, .present = true },
>  	[tegra_clk_i2s3] = { .dt_id = TEGRA114_CLK_I2S3, .present = true },
> @@ -1047,6 +1046,12 @@ static __init void tegra114_periph_clk_init(void __iomem *clk_base,
>  					     0, 82, periph_clk_enb_refcnt);
>  	clks[TEGRA114_CLK_DSIB] = clk;
>  
> +	/* csus */
> +	clk = tegra_clk_register_periph_gate("csus", "vi_sensor", 0,
> +					     clk_base, 0, TEGRA114_CLK_CSUS,
> +					     periph_clk_enb_refcnt);
> +	clks[TEGRA114_CLK_CSUS] = clk;
> +
>  	/* emc mux */
>  	clk = clk_register_mux(NULL, "emc_mux", mux_pllmcp_clkm,
>  			       ARRAY_SIZE(mux_pllmcp_clkm),
> diff --git a/drivers/clk/tegra/clk-tegra20.c b/drivers/clk/tegra/clk-tegra20.c
> index 2c58ce25af75..d8d5afeb6f9b 100644
> --- a/drivers/clk/tegra/clk-tegra20.c
> +++ b/drivers/clk/tegra/clk-tegra20.c
> @@ -530,7 +530,6 @@ static struct tegra_clk tegra20_clks[tegra_clk_max] __initdata = {
>  	[tegra_clk_rtc] = { .dt_id = TEGRA20_CLK_RTC, .present = true },
>  	[tegra_clk_timer] = { .dt_id = TEGRA20_CLK_TIMER, .present = true },
>  	[tegra_clk_kbc] = { .dt_id = TEGRA20_CLK_KBC, .present = true },
> -	[tegra_clk_csus] = { .dt_id = TEGRA20_CLK_CSUS, .present = true },
>  	[tegra_clk_vcp] = { .dt_id = TEGRA20_CLK_VCP, .present = true },
>  	[tegra_clk_bsea] = { .dt_id = TEGRA20_CLK_BSEA, .present = true },
>  	[tegra_clk_bsev] = { .dt_id = TEGRA20_CLK_BSEV, .present = true },
> @@ -834,6 +833,12 @@ static void __init tegra20_periph_clk_init(void)
>  				    clk_base, 0, 93, periph_clk_enb_refcnt);
>  	clks[TEGRA20_CLK_CDEV2] = clk;
>  
> +	/* csus */
> +	clk = tegra_clk_register_periph_gate("csus", "csus_mux", 0,
> +					     clk_base, 0, TEGRA20_CLK_CSUS,
> +					     periph_clk_enb_refcnt);
> +	clks[TEGRA20_CLK_CSUS] = clk;
> +
>  	for (i = 0; i < ARRAY_SIZE(tegra_periph_clk_list); i++) {
>  		data = &tegra_periph_clk_list[i];
>  		clk = tegra_clk_register_periph_data(clk_base, data);
> @@ -1093,14 +1098,15 @@ static struct clk *tegra20_clk_src_onecell_get(struct of_phandle_args *clkspec,
>  	hw = __clk_get_hw(clk);
>  
>  	/*
> -	 * Tegra20 CDEV1 and CDEV2 clocks are a bit special case, their parent
> -	 * clock is created by the pinctrl driver. It is possible for clk user
> -	 * to request these clocks before pinctrl driver got probed and hence
> -	 * user will get an orphaned clock. That might be undesirable because
> -	 * user may expect parent clock to be enabled by the child.
> +	 * Tegra20 CDEV1, CDEV2 and CSUS clocks are a bit special case, their
> +	 * parent clock is created by the pinctrl driver. It is possible for
> +	 * clk user to request these clocks before pinctrl driver got probed
> +	 * and hence user will get an orphaned clock. That might be undesirable
> +	 * because user may expect parent clock to be enabled by the child.
>  	 */
>  	if (clkspec->args[0] == TEGRA20_CLK_CDEV1 ||
> -	    clkspec->args[0] == TEGRA20_CLK_CDEV2) {
> +	    clkspec->args[0] == TEGRA20_CLK_CDEV2 ||
> +	    clkspec->args[0] == TEGRA20_CLK_CSUS) {
>  		parent_hw = clk_hw_get_parent(hw);
>  		if (!parent_hw)
>  			return ERR_PTR(-EPROBE_DEFER);
> diff --git a/drivers/clk/tegra/clk-tegra30.c b/drivers/clk/tegra/clk-tegra30.c
> index 82a8cb9545eb..ca367184e185 100644
> --- a/drivers/clk/tegra/clk-tegra30.c
> +++ b/drivers/clk/tegra/clk-tegra30.c
> @@ -779,7 +779,6 @@ static struct tegra_clk tegra30_clks[tegra_clk_max] __initdata = {
>  	[tegra_clk_rtc] = { .dt_id = TEGRA30_CLK_RTC, .present = true },
>  	[tegra_clk_timer] = { .dt_id = TEGRA30_CLK_TIMER, .present = true },
>  	[tegra_clk_kbc] = { .dt_id = TEGRA30_CLK_KBC, .present = true },
> -	[tegra_clk_csus] = { .dt_id = TEGRA30_CLK_CSUS, .present = true },
>  	[tegra_clk_vcp] = { .dt_id = TEGRA30_CLK_VCP, .present = true },
>  	[tegra_clk_bsea] = { .dt_id = TEGRA30_CLK_BSEA, .present = true },
>  	[tegra_clk_bsev] = { .dt_id = TEGRA30_CLK_BSEV, .present = true },
> @@ -1008,6 +1007,12 @@ static void __init tegra30_periph_clk_init(void)
>  				    0, 48, periph_clk_enb_refcnt);
>  	clks[TEGRA30_CLK_DSIA] = clk;
>  
> +	/* csus */
> +	clk = tegra_clk_register_periph_gate("csus", "vi_sensor", 0,
> +					     clk_base, 0, TEGRA30_CLK_CSUS,
> +					     periph_clk_enb_refcnt);
> +	clks[TEGRA30_CLK_CSUS] = clk;
> +
>  	/* pcie */
>  	clk = tegra_clk_register_periph_gate("pcie", "clk_m", 0, clk_base, 0,
>  				    70, periph_clk_enb_refcnt);
> diff --git a/drivers/pinctrl/tegra/pinctrl-tegra20.c b/drivers/pinctrl/tegra/pinctrl-tegra20.c
> index 737fc2000f66..437e0ac091cc 100644
> --- a/drivers/pinctrl/tegra/pinctrl-tegra20.c
> +++ b/drivers/pinctrl/tegra/pinctrl-tegra20.c
> @@ -2230,6 +2230,10 @@ static const char *cdev2_parents[] = {
>  	"dev2_osc_div", "hclk", "pclk", "pll_p_out4",
>  };
>  
> +static const char *csus_parents[] = {
> +	"pll_c_out1", "pll_p_out2", "pll_p_out3", "vi_sensor",
> +};
> +
>  static void tegra20_pinctrl_register_clock_muxes(struct platform_device *pdev)
>  {
>  	struct tegra_pmx *pmx = platform_get_drvdata(pdev);
> @@ -2239,6 +2243,9 @@ static void tegra20_pinctrl_register_clock_muxes(struct platform_device *pdev)
>  
>  	clk_register_mux(NULL, "cdev2_mux", cdev2_parents, 4, 0,
>  			 pmx->regs[1] + 0x8, 4, 2, CLK_MUX_READ_ONLY, NULL);
> +
> +	clk_register_mux(NULL, "csus_mux", csus_parents, 4, 0,
> +			 pmx->regs[1] + 0x8, 6, 2, CLK_MUX_READ_ONLY, NULL);
>  }
>  
>  static int tegra20_pinctrl_probe(struct platform_device *pdev)
> 

Please move the pinctrl changes to a separate patch. Otherwise, LGTM.

Mikko