clk: mediatek: add VDOSYS1 clock

Add the clock gate definition for the DPI1 hardware
in VDOSYS1.

The parent clock "hdmi_txpll" is already defined in
`mt8195.dtsi`.
Signed-off-by: Pablo Sun <pablo.sun@mediatek.com>
Signed-off-by: Guillaume Ranquet <granquet@baylibre.com>
Reviewed-by: Chen-Yu Tsai <wenst@chromium.org>
Link: https://lore.kernel.org/r/20220919-v1-2-4844816c9808@baylibre.comSigned-off-by: Chen-Yu Tsai <wenst@chromium.org>

drivers/clk/mediatek/clk-mt8195-vdo1.c

@@ -34,6 +34,12 @@ static const struct mtk_gate_regs vdo1_3_cg_regs = {
 	.sta_ofs = 0x140,
 };
 
+static const struct mtk_gate_regs vdo1_4_cg_regs = {
+	.set_ofs = 0x400,
+	.clr_ofs = 0x400,
+	.sta_ofs = 0x400,
+};
+
 #define GATE_VDO1_0(_id, _name, _parent, _shift)			\
 	GATE_MTK(_id, _name, _parent, &vdo1_0_cg_regs, _shift, &mtk_clk_gate_ops_setclr)
 
@@ -50,6 +56,9 @@ static const struct mtk_gate_regs vdo1_3_cg_regs = {
 #define GATE_VDO1_3(_id, _name, _parent, _shift)			\
 	GATE_MTK(_id, _name, _parent, &vdo1_3_cg_regs, _shift, &mtk_clk_gate_ops_setclr)
 
+#define GATE_VDO1_4(_id, _name, _parent, _shift)			\
+	GATE_MTK(_id, _name, _parent, &vdo1_4_cg_regs, _shift, &mtk_clk_gate_ops_no_setclr_inv)
+
 static const struct mtk_gate vdo1_clks[] = {
 	/* VDO1_0 */
 	GATE_VDO1_0(CLK_VDO1_SMI_LARB2, "vdo1_smi_larb2", "top_vpp", 0),
@@ -107,6 +116,8 @@ static const struct mtk_gate vdo1_clks[] = {
 	GATE_VDO1_2(CLK_VDO1_DISP_MONITOR_DPINTF, "vdo1_disp_monitor_dpintf", "top_vpp", 17),
 	/* VDO1_3 */
 	GATE_VDO1_3(CLK_VDO1_26M_SLOW, "vdo1_26m_slow", "clk26m", 8),
+	/* VDO1_4 */
+	GATE_VDO1_4(CLK_VDO1_DPI1_HDMI, "vdo1_dpi1_hdmi", "hdmi_txpll", 0),
 };
 
 static int clk_mt8195_vdo1_probe(struct platform_device *pdev)