Thread (52 messages) 52 messages, 6 authors, 2025-07-22

Re: [PATCH v2 14/29] clk: mediatek: Add MT8196 vlpckgen clock support

From: Chen-Yu Tsai <wenst@chromium.org>
Date: 2025-07-15 07:28:14
Also in: linux-arm-kernel, linux-clk, linux-devicetree, linux-mediatek, lkml

Hi,


On Tue, Jun 24, 2025 at 10:33 PM Laura Nao [off-list ref] wrote:
quoted hunk ↗ jump to hunk
Add support for the MT8196 vlpckgen clock controller, which provides
muxes and dividers for clock selection in other IP blocks.

Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Signed-off-by: Laura Nao <redacted>
---
 drivers/clk/mediatek/Makefile              |   2 +-
 drivers/clk/mediatek/clk-mt8196-vlpckgen.c | 769 +++++++++++++++++++++
 2 files changed, 770 insertions(+), 1 deletion(-)
 create mode 100644 drivers/clk/mediatek/clk-mt8196-vlpckgen.c
diff --git a/drivers/clk/mediatek/Makefile b/drivers/clk/mediatek/Makefile
index 0688d7bf4979..24683dd51783 100644
--- a/drivers/clk/mediatek/Makefile
+++ b/drivers/clk/mediatek/Makefile
@@ -161,7 +161,7 @@ obj-$(CONFIG_COMMON_CLK_MT8195_VENCSYS) += clk-mt8195-venc.o
 obj-$(CONFIG_COMMON_CLK_MT8195_VPPSYS) += clk-mt8195-vpp0.o clk-mt8195-vpp1.o
 obj-$(CONFIG_COMMON_CLK_MT8195_WPESYS) += clk-mt8195-wpe.o
 obj-$(CONFIG_COMMON_CLK_MT8196) += clk-mt8196-apmixedsys.o clk-mt8196-topckgen.o \
-                                  clk-mt8196-topckgen2.o
+                                  clk-mt8196-topckgen2.o clk-mt8196-vlpckgen.o
 obj-$(CONFIG_COMMON_CLK_MT8365) += clk-mt8365-apmixedsys.o clk-mt8365.o
 obj-$(CONFIG_COMMON_CLK_MT8365_APU) += clk-mt8365-apu.o
 obj-$(CONFIG_COMMON_CLK_MT8365_CAM) += clk-mt8365-cam.o
diff --git a/drivers/clk/mediatek/clk-mt8196-vlpckgen.c b/drivers/clk/mediatek/clk-mt8196-vlpckgen.c
new file mode 100644
index 000000000000..23a673dd4c5c
--- /dev/null
+++ b/drivers/clk/mediatek/clk-mt8196-vlpckgen.c
@@ -0,0 +1,769 @@
[...]
+static const char * const vlp_camtg0_parents[] = {
+       "clk26m",
+       "univpll_192m_d32",
+       "univpll_192m_d16",
+       "clk13m",
+       "osc_d40",
+       "osc_d32",
+       "univpll_192m_d10",
+       "univpll_192m_d8",
+       "univpll_d6_d16",
+       "ulposc3",
+       "osc_d20",
+       "ck2_tvdpll1_d16",
+       "univpll_d6_d8"
+};
It seems all the vlp_camtg* parents are the same. Please merge them
and just have one list.
+static const char * const vlp_sspm_26m_parents[] = {
+       "clk26m",
+       "osc_d20"
+};
+
+static const char * const vlp_ulposc_sspm_parents[] = {
+       "clk26m",
+       "osc_d2",
+       "mainpll_d4_d2"
+};
+
+static const char * const vlp_vlp_pbus_26m_parents[] = {
+       "clk26m",
+       "osc_d20"
+};
+
+static const char * const vlp_debug_err_flag_parents[] = {
+       "clk26m",
+       "osc_d20"
+};
+
+static const char * const vlp_dpmsrdma_parents[] = {
+       "clk26m",
+       "mainpll_d7_d2"
+};
+
+static const char * const vlp_vlp_pbus_156m_parents[] = {
+       "clk26m",
+       "osc_d2",
+       "mainpll_d7_d2",
+       "mainpll_d7"
+};
+
+static const char * const vlp_spm_parents[] = {
+       "clk26m",
+       "mainpll_d7_d4"
+};
+
+static const char * const vlp_mminfra_parents[] = {
+       "clk26m",
+       "osc_d4",
+       "mainpll_d3"
+};
+
+static const char * const vlp_usb_parents[] = {
+       "clk26m",
+       "mainpll_d9"
+};
The previous and the next one are the same.
+static const char * const vlp_usb_xhci_parents[] = {
+       "clk26m",
+       "mainpll_d9"
+};
+
+static const char * const vlp_noc_vlp_parents[] = {
+       "clk26m",
+       "osc_d20",
+       "mainpll_d9"
+};
+
+static const char * const vlp_audio_h_parents[] = {
+       "clk26m",
+       "vlp_apll1",
+       "vlp_apll2"
+};
+
+static const char * const vlp_aud_engen1_parents[] = {
+       "clk26m",
+       "apll1_d8",
+       "apll1_d4"
+};
The previous and the next one are the same.
+static const char * const vlp_aud_engen2_parents[] = {
+       "clk26m",
+       "apll2_d8",
+       "apll2_d4"
+};
+
+static const char * const vlp_aud_intbus_parents[] = {
+       "clk26m",
+       "mainpll_d7_d4",
+       "mainpll_d4_d4"
+};
+
+static const char * const vlp_spvlp_26m
[...]
+static int clk_mt8196_vlp_probe(struct platform_device *pdev)
+{
+       struct clk_hw_onecell_data *clk_data;
+       int r;
+       struct device_node *node = pdev->dev.of_node;
+
+       clk_data = mtk_alloc_clk_data(ARRAY_SIZE(vlp_muxes) +
+                                     ARRAY_SIZE(vlp_plls));
+       if (!clk_data)
+               return -ENOMEM;
+
+       r = mtk_clk_register_muxes(&pdev->dev, vlp_muxes, ARRAY_SIZE(vlp_muxes),
+                                  node, &mt8196_clk_vlp_lock, clk_data);
+       if (r)
+               goto free_clk_data;
+
+       r = mtk_clk_register_plls(node, vlp_plls, ARRAY_SIZE(vlp_plls),
+                                 clk_data);
+       if (r)
+               goto unregister_muxes;
+
+       r = of_clk_add_hw_provider(node, of_clk_hw_onecell_get, clk_data);
+       if (r)
+               goto unregister_plls;
+
+       platform_set_drvdata(pdev, clk_data);
+
+       return r;
+
+unregister_plls:
+       mtk_clk_unregister_plls(vlp_plls, ARRAY_SIZE(vlp_plls), clk_data);
+unregister_muxes:
+       mtk_clk_unregister_muxes(vlp_muxes, ARRAY_SIZE(vlp_muxes), clk_data);
+free_clk_data:
+       mtk_free_clk_data(clk_data);
The AFE driver sets some tuner parameters in the VLPCKGEN block at probe
time. Maybe we could do that here instead?

/* vlp_cksys_clk: 0x1c016000 */
#define VLP_APLL1_TUNER_CON0 0x02a4
#define VLP_APLL2_TUNER_CON0 0x02a8

/* vlp apll1 tuner default value*/
#define VLP_APLL1_TUNER_CON0_VALUE 0x6f28bd4d
/* vlp apll2 tuner default value + 1*/
#define VLP_APLL2_TUNER_CON0_VALUE 0x78fd5265

       regmap_write(afe_priv->vlp_ck, VLP_APLL1_TUNER_CON0,
VLP_APLL1_TUNER_CON0_VALUE);
       regmap_write(afe_priv->vlp_ck, VLP_APLL2_TUNER_CON0,
VLP_APLL2_TUNER_CON0_VALUE);

ChenYu
+
+       return r;
+}
+
+static void clk_mt8196_vlp_remove(struct platform_device *pdev)
+{
+       struct clk_hw_onecell_data *clk_data = platform_get_drvdata(pdev);
+       struct device_node *node = pdev->dev.of_node;
+
+       of_clk_del_provider(node);
+       mtk_clk_unregister_plls(vlp_plls, ARRAY_SIZE(vlp_plls), clk_data);
+       mtk_clk_unregister_muxes(vlp_muxes, ARRAY_SIZE(vlp_muxes), clk_data);
+       mtk_free_clk_data(clk_data);
+}
+
+static const struct of_device_id of_match_clk_mt8196_vlp_ck[] = {
+       { .compatible = "mediatek,mt8196-vlpckgen" },
+       { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, of_match_clk_mt8196_vlp_ck);
+
+static struct platform_driver clk_mt8196_vlp_drv = {
+       .probe = clk_mt8196_vlp_probe,
+       .remove = clk_mt8196_vlp_remove,
+       .driver = {
+               .name = "clk-mt8196-vlpck",
+               .of_match_table = of_match_clk_mt8196_vlp_ck,
+       },
+};
+
+MODULE_DESCRIPTION("MediaTek MT8196 VLP clock generator driver");
+module_platform_driver(clk_mt8196_vlp_drv);
+MODULE_LICENSE("GPL");
--
2.39.5
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