On Saturday, September 6, 2025 10:53 PM Svyatoslav Ryhel wrote:
> CSUS clock which is camera MCLK, is also a clock gate for vi_sensor so
> lets model it by creating CSUS grate with vi_sensor as a parent.
s/grate/gate/; "vi_sensor's" in commit message.
The commit message is a bit difficult to understand (to me at least), perhaps
explain it in terms of the clock signal flow, e.g. "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."
For Tegra30/114, I think this is correct. For Tegra20, I noticed that for the
two other output clocks -- cdev1 and cdev2 -- we already are modelling the
source clock muxing in the clock framework through clocks called cdev1_mux and
cdev2_mux which are registered as read-only mux clocks in pinctrl-tegra20.c. So
I think the same should be done for csus -- add a csus_mux clock in
pinctrl-tegra20.c, and make it csus's parent. For Tegra30 and later chips,
these output clocks seem to have only one source clock.
Thanks,
Mikko
>
> Signed-off-by: Svyatoslav Ryhel <clamo...@gmail.com>
> ---
> drivers/clk/tegra/clk-tegra114.c | 7 ++++++-
> drivers/clk/tegra/clk-tegra20.c | 7 ++++++-
> drivers/clk/tegra/clk-tegra30.c | 7 ++++++-
> 3 files changed, 18 insertions(+), 3 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..bf9a9f8ddf62 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 },
> @@ -807,6 +806,12 @@ static void __init tegra20_periph_clk_init(void)
> clk_register_clkdev(clk, NULL, "dsi");
> clks[TEGRA20_CLK_DSI] = clk;
>
> + /* csus */
> + clk = tegra_clk_register_periph_gate("csus", "vi_sensor", 0,
> + clk_base, 0, TEGRA20_CLK_CSUS,
> + periph_clk_enb_refcnt);
> + clks[TEGRA20_CLK_CSUS] = clk;
> +
> /* pex */
> clk = tegra_clk_register_periph_gate("pex", "clk_m", 0, clk_base, 0, 70,
> periph_clk_enb_refcnt);
> 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);
>
