Re: [PATCH v4 02/18] clk: thead: Add clock support for VO subsystem in T-Head TH1520 SoC

Matt Coster
2025-01-31T15:40:08Z

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On 28/01/2025 19:48, Michal Wilczynski wrote:
> The T-Head TH1520 SoC integrates a variety of clocks for its subsystems,
> including the Application Processor (AP) and the Video Output (VO) [1].
> Up until now, the T-Head clock driver only supported AP clocks.
>
> This commit extends the driver to provide clock functionality for the VO
> subsystem. At this stage, the focus is on implementing the VO clock
> gates, as these are currently the most relevant and required components
> for enabling and disabling the VO subsystem functionality. Future
> enhancements may introduce additional VO-related clocks as necessary.
>
> Link: https://openbeagle.org/beaglev-ahead/beaglev-ahead/-/blob/main/docs/TH1520%20System%20User%20Manual.pdf [1]
>
> Signed-off-by: Michal Wilczynski <m.wilczynski@samsung.com>
> ---
> drivers/clk/thead/clk-th1520-ap.c | 197 +++++++++++++++++++++++++-----
> 1 file changed, 169 insertions(+), 28 deletions(-)
>
> diff --git a/drivers/clk/thead/clk-th1520-ap.c b/drivers/clk/thead/clk-th1520-ap.c
> index 4c9555fc6184..57972589f120 100644
> --- a/drivers/clk/thead/clk-th1520-ap.c
> +++ b/drivers/clk/thead/clk-th1520-ap.c
> @@ -847,6 +847,67 @@ static CCU_GATE(CLK_SRAM1, sram1_clk, "sram1", axi_aclk_pd, 0x20c, BIT(3), 0);
> static CCU_GATE(CLK_SRAM2, sram2_clk, "sram2", axi_aclk_pd, 0x20c, BIT(2), 0);
> static CCU_GATE(CLK_SRAM3, sram3_clk, "sram3", axi_aclk_pd, 0x20c, BIT(1), 0);
>
> +static CCU_GATE(CLK_AXI4_VO_ACLK, axi4_vo_aclk, "axi4-vo-aclk",
> + video_pll_clk_pd, 0x0, BIT(0), 0);
> +static CCU_GATE(CLK_GPU_CORE, gpu_core_clk, "gpu-core-clk", video_pll_clk_pd,
> + 0x0, BIT(3), 0);
> +static CCU_GATE(CLK_GPU_CFG_ACLK, gpu_cfg_aclk, "gpu-cfg-aclk",
> + video_pll_clk_pd, 0x0, BIT(4), 0);

I see CORE and CFG clocks here; what about MEM? It's listed in the
linked TRM as BIT(2).

Cheers,
Matt

> +static CCU_GATE(CLK_DPU_PIXELCLK0, dpu0_pixelclk, "dpu0-pixelclk",
> + video_pll_clk_pd, 0x0, BIT(5), 0);
> +static CCU_GATE(CLK_DPU_PIXELCLK1, dpu1_pixelclk, "dpu1-pixelclk",
> + video_pll_clk_pd, 0x0, BIT(6), 0);
> +static CCU_GATE(CLK_DPU_HCLK, dpu_hclk, "dpu-hclk", video_pll_clk_pd, 0x0,
> + BIT(7), 0);
> +static CCU_GATE(CLK_DPU_ACLK, dpu_aclk, "dpu-aclk", video_pll_clk_pd, 0x0,
> + BIT(8), 0);
> +static CCU_GATE(CLK_DPU_CCLK, dpu_cclk, "dpu-cclk", video_pll_clk_pd, 0x0,
> + BIT(9), 0);
> +static CCU_GATE(CLK_HDMI_SFR, hdmi_sfr_clk, "hdmi-sfr-clk", video_pll_clk_pd,
> + 0x0, BIT(10), 0);
> +static CCU_GATE(CLK_HDMI_PCLK, hdmi_pclk, "hdmi-pclk", video_pll_clk_pd, 0x0,
> + BIT(11), 0);
> +static CCU_GATE(CLK_HDMI_CEC, hdmi_cec_clk, "hdmi-cec-clk", video_pll_clk_pd,
> + 0x0, BIT(12), 0);
> +static CCU_GATE(CLK_MIPI_DSI0_PCLK, mipi_dsi0_pclk, "mipi-dsi0-pclk",
> + video_pll_clk_pd, 0x0, BIT(13), 0);
> +static CCU_GATE(CLK_MIPI_DSI1_PCLK, mipi_dsi1_pclk, "mipi-dsi1-pclk",
> + video_pll_clk_pd, 0x0, BIT(14), 0);
> +static CCU_GATE(CLK_MIPI_DSI0_CFG, mipi_dsi0_cfg_clk, "mipi-dsi0-cfg-clk",
> + video_pll_clk_pd, 0x0, BIT(15), 0);
> +static CCU_GATE(CLK_MIPI_DSI1_CFG, mipi_dsi1_cfg_clk, "mipi-dsi1-cfg-clk",
> + video_pll_clk_pd, 0x0, BIT(16), 0);
> +static CCU_GATE(CLK_MIPI_DSI0_REFCLK, mipi_dsi0_refclk, "mipi-dsi0-refclk",
> + video_pll_clk_pd, 0x0, BIT(17), 0);
> +static CCU_GATE(CLK_MIPI_DSI1_REFCLK, mipi_dsi1_refclk, "mipi-dsi1-refclk",
> + video_pll_clk_pd, 0x0, BIT(18), 0);
> +static CCU_GATE(CLK_HDMI_I2S, hdmi_i2s_clk, "hdmi-i2s-clk", video_pll_clk_pd,
> + 0x0, BIT(19), 0);
> +static CCU_GATE(CLK_X2H_DPU1_ACLK, x2h_dpu1_aclk, "x2h-dpu1-aclk",
> + video_pll_clk_pd, 0x0, BIT(20), 0);
> +static CCU_GATE(CLK_X2H_DPU_ACLK, x2h_dpu_aclk, "x2h-dpu-aclk",
> + video_pll_clk_pd, 0x0, BIT(21), 0);
> +static CCU_GATE(CLK_AXI4_VO_PCLK, axi4_vo_pclk, "axi4-vo-pclk",
> + video_pll_clk_pd, 0x0, BIT(22), 0);
> +static CCU_GATE(CLK_IOPMP_VOSYS_DPU_PCLK, iopmp_vosys_dpu_pclk,
> + "iopmp-vosys-dpu-pclk", video_pll_clk_pd, 0x0, BIT(23), 0);
> +static CCU_GATE(CLK_IOPMP_VOSYS_DPU1_PCLK, iopmp_vosys_dpu1_pclk,
> + "iopmp-vosys-dpu1-pclk", video_pll_clk_pd, 0x0, BIT(24), 0);
> +static CCU_GATE(CLK_IOPMP_VOSYS_GPU_PCLK, iopmp_vosys_gpu_pclk,
> + "iopmp-vosys-gpu-pclk", video_pll_clk_pd, 0x0, BIT(25), 0);
> +static CCU_GATE(CLK_IOPMP_DPU1_ACLK, iopmp_dpu1_aclk, "iopmp-dpu1-aclk",
> + video_pll_clk_pd, 0x0, BIT(27), 0);
> +static CCU_GATE(CLK_IOPMP_DPU_ACLK, iopmp_dpu_aclk, "iopmp-dpu-aclk",
> + video_pll_clk_pd, 0x0, BIT(28), 0);
> +static CCU_GATE(CLK_IOPMP_GPU_ACLK, iopmp_gpu_aclk, "iopmp-gpu-aclk",
> + video_pll_clk_pd, 0x0, BIT(29), 0);
> +static CCU_GATE(CLK_MIPIDSI0_PIXCLK, mipi_dsi0_pixclk, "mipi-dsi0-pixclk",
> + video_pll_clk_pd, 0x0, BIT(30), 0);
> +static CCU_GATE(CLK_MIPIDSI1_PIXCLK, mipi_dsi1_pixclk, "mipi-dsi1-pixclk",
> + video_pll_clk_pd, 0x0, BIT(31), 0);
> +static CCU_GATE(CLK_HDMI_PIXCLK, hdmi_pixclk, "hdmi-pixclk", video_pll_clk_pd,
> + 0x4, BIT(0), 0);
> +
> static CLK_FIXED_FACTOR_HW(gmac_pll_clk_100m, "gmac-pll-clk-100m",
> &gmac_pll_clk.common.hw, 10, 1, 0);
>
> @@ -963,7 +1024,38 @@ static struct ccu_common *th1520_gate_clks[] = {
> &sram3_clk.common,
> };
>
> -#define NR_CLKS (CLK_UART_SCLK + 1)
> +static struct ccu_common *th1520_vo_gate_clks[] = {
> + &axi4_vo_aclk.common,
> + &gpu_core_clk.common,
> + &gpu_cfg_aclk.common,
> + &dpu0_pixelclk.common,
> + &dpu1_pixelclk.common,
> + &dpu_hclk.common,
> + &dpu_aclk.common,
> + &dpu_cclk.common,
> + &hdmi_sfr_clk.common,
> + &hdmi_pclk.common,
> + &hdmi_cec_clk.common,
> + &mipi_dsi0_pclk.common,
> + &mipi_dsi1_pclk.common,
> + &mipi_dsi0_cfg_clk.common,
> + &mipi_dsi1_cfg_clk.common,
> + &mipi_dsi0_refclk.common,
> + &mipi_dsi1_refclk.common,
> + &hdmi_i2s_clk.common,
> + &x2h_dpu1_aclk.common,
> + &x2h_dpu_aclk.common,
> + &axi4_vo_pclk.common,
> + &iopmp_vosys_dpu_pclk.common,
> + &iopmp_vosys_dpu1_pclk.common,
> + &iopmp_vosys_gpu_pclk.common,
> + &iopmp_dpu1_aclk.common,
> + &iopmp_dpu_aclk.common,
> + &iopmp_gpu_aclk.common,
> + &mipi_dsi0_pixclk.common,
> + &mipi_dsi1_pixclk.common,
> + &hdmi_pixclk.common
> +};
>
> static const struct regmap_config th1520_clk_regmap_config = {
> .reg_bits = 32,
> @@ -972,8 +1064,44 @@ static const struct regmap_config th1520_clk_regmap_config = {
> .fast_io = true,
> };
>
> +struct th1520_plat_data {
> + struct ccu_common **th1520_pll_clks;
> + struct ccu_common **th1520_div_clks;
> + struct ccu_common **th1520_mux_clks;
> + struct ccu_common **th1520_gate_clks;
> +
> + int nr_clks;
> + int nr_pll_clks;
> + int nr_div_clks;
> + int nr_mux_clks;
> + int nr_gate_clks;
> +};
> +
> +static const struct th1520_plat_data th1520_ap_platdata = {
> + .th1520_pll_clks = th1520_pll_clks,
> + .th1520_div_clks = th1520_div_clks,
> + .th1520_mux_clks = th1520_mux_clks,
> + .th1520_gate_clks = th1520_gate_clks,
> +
> + .nr_clks = CLK_UART_SCLK + 1,
> +
> + .nr_pll_clks = ARRAY_SIZE(th1520_pll_clks),
> + .nr_div_clks = ARRAY_SIZE(th1520_div_clks),
> + .nr_mux_clks = ARRAY_SIZE(th1520_mux_clks),
> + .nr_gate_clks = ARRAY_SIZE(th1520_gate_clks),
> +};
> +
> +static const struct th1520_plat_data th1520_vo_platdata = {
> + .th1520_gate_clks = th1520_vo_gate_clks,
> +
> + .nr_clks = CLK_HDMI_PIXCLK + 1,
> +
> + .nr_gate_clks = ARRAY_SIZE(th1520_vo_gate_clks),
> +};
> +
> static int th1520_clk_probe(struct platform_device *pdev)
> {
> + const struct th1520_plat_data *plat_data;
> struct device *dev = &pdev->dev;
> struct clk_hw_onecell_data *priv;
>
> @@ -982,11 +1110,17 @@ static int th1520_clk_probe(struct platform_device *pdev)
> struct clk_hw *hw;
> int ret, i;
>
> - priv = devm_kzalloc(dev, struct_size(priv, hws, NR_CLKS), GFP_KERNEL);
> + plat_data = device_get_match_data(&pdev->dev);
> + if (!plat_data) {
> + dev_err(&pdev->dev, "Error: No device match data found\n");
> + return -ENODEV;
> + }
> +
> + priv = devm_kzalloc(dev, struct_size(priv, hws, plat_data->nr_clks), GFP_KERNEL);
> if (!priv)
> return -ENOMEM;
>
> - priv->num = NR_CLKS;
> + priv->num = plat_data->nr_clks;
>
> base = devm_platform_ioremap_resource(pdev, 0);
> if (IS_ERR(base))
> @@ -996,35 +1130,35 @@ static int th1520_clk_probe(struct platform_device *pdev)
> if (IS_ERR(map))
> return PTR_ERR(map);
>
> - for (i = 0; i < ARRAY_SIZE(th1520_pll_clks); i++) {
> - struct ccu_pll *cp = hw_to_ccu_pll(&th1520_pll_clks[i]->hw);
> + for (i = 0; i < plat_data->nr_pll_clks; i++) {
> + struct ccu_pll *cp = hw_to_ccu_pll(&plat_data->th1520_pll_clks[i]->hw);
>
> - th1520_pll_clks[i]->map = map;
> + plat_data->th1520_pll_clks[i]->map = map;
>
> - ret = devm_clk_hw_register(dev, &th1520_pll_clks[i]->hw);
> + ret = devm_clk_hw_register(dev, &plat_data->th1520_pll_clks[i]->hw);
> if (ret)
> return ret;
>
> priv->hws[cp->common.clkid] = &cp->common.hw;
> }
>
> - for (i = 0; i < ARRAY_SIZE(th1520_div_clks); i++) {
> - struct ccu_div *cd = hw_to_ccu_div(&th1520_div_clks[i]->hw);
> + for (i = 0; i < plat_data->nr_div_clks; i++) {
> + struct ccu_div *cd = hw_to_ccu_div(&plat_data->th1520_div_clks[i]->hw);
>
> - th1520_div_clks[i]->map = map;
> + plat_data->th1520_div_clks[i]->map = map;
>
> - ret = devm_clk_hw_register(dev, &th1520_div_clks[i]->hw);
> + ret = devm_clk_hw_register(dev, &plat_data->th1520_div_clks[i]->hw);
> if (ret)
> return ret;
>
> priv->hws[cd->common.clkid] = &cd->common.hw;
> }
>
> - for (i = 0; i < ARRAY_SIZE(th1520_mux_clks); i++) {
> - struct ccu_mux *cm = hw_to_ccu_mux(&th1520_mux_clks[i]->hw);
> + for (i = 0; i < plat_data->nr_mux_clks; i++) {
> + struct ccu_mux *cm = hw_to_ccu_mux(&plat_data->th1520_mux_clks[i]->hw);
> const struct clk_init_data *init = cm->common.hw.init;
>
> - th1520_mux_clks[i]->map = map;
> + plat_data->th1520_mux_clks[i]->map = map;
> hw = devm_clk_hw_register_mux_parent_data_table(dev,
> init->name,
> init->parent_data,
> @@ -1040,10 +1174,10 @@ static int th1520_clk_probe(struct platform_device *pdev)
> priv->hws[cm->common.clkid] = hw;
> }
>
> - for (i = 0; i < ARRAY_SIZE(th1520_gate_clks); i++) {
> - struct ccu_gate *cg = hw_to_ccu_gate(&th1520_gate_clks[i]->hw);
> + for (i = 0; i < plat_data->nr_gate_clks; i++) {
> + struct ccu_gate *cg = hw_to_ccu_gate(&plat_data->th1520_gate_clks[i]->hw);
>
> - th1520_gate_clks[i]->map = map;
> + plat_data->th1520_gate_clks[i]->map = map;
>
> hw = devm_clk_hw_register_gate_parent_data(dev,
> cg->common.hw.init->name,
> @@ -1057,19 +1191,21 @@ static int th1520_clk_probe(struct platform_device *pdev)
> priv->hws[cg->common.clkid] = hw;
> }
>
> - ret = devm_clk_hw_register(dev, &osc12m_clk.hw);
> - if (ret)
> - return ret;
> - priv->hws[CLK_OSC12M] = &osc12m_clk.hw;
> + if (plat_data == &th1520_ap_platdata) {
> + ret = devm_clk_hw_register(dev, &osc12m_clk.hw);
> + if (ret)
> + return ret;
> + priv->hws[CLK_OSC12M] = &osc12m_clk.hw;
>
> - ret = devm_clk_hw_register(dev, &gmac_pll_clk_100m.hw);
> - if (ret)
> - return ret;
> - priv->hws[CLK_PLL_GMAC_100M] = &gmac_pll_clk_100m.hw;
> + ret = devm_clk_hw_register(dev, &gmac_pll_clk_100m.hw);
> + if (ret)
> + return ret;
> + priv->hws[CLK_PLL_GMAC_100M] = &gmac_pll_clk_100m.hw;
>
> - ret = devm_clk_hw_register(dev, &emmc_sdio_ref_clk.hw);
> - if (ret)
> - return ret;
> + ret = devm_clk_hw_register(dev, &emmc_sdio_ref_clk.hw);
> + if (ret)
> + return ret;
> + }
>
> ret = devm_of_clk_add_hw_provider(dev, of_clk_hw_onecell_get, priv);
> if (ret)
> @@ -1081,6 +1217,11 @@ static int th1520_clk_probe(struct platform_device *pdev)
> static const struct of_device_id th1520_clk_match[] = {
> {
> .compatible = "thead,th1520-clk-ap",
> + .data = &th1520_ap_platdata,
> + },
> + {
> + .compatible = "thead,th1520-clk-vo",
> + .data = &th1520_vo_platdata,
> },
> { /* sentinel */ },
> };

--
Matt Coster
E: matt.coster@imgtec.com

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