drm/msm/hdmi: make hdmi_phy_8996 OF clk provider

On MSM8996 the HDMI PHY provides the PLL clock to the MMCC. As we are
preparing to convert the MSM8996 to use DT clocks properties (rather
than global clock names), register the OF clock provider.

While we are at it, also change the driver to use clk_parent_data rather
parent_names to setup a link to the XO clock.
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Abhinav Kumar <quic_abhinavk@quicinc.com>
Patchwork: https://patchwork.freedesktop.org/patch/492318/
Link: https://lore.kernel.org/r/20220704161148.814510-3-dmitry.baryshkov@linaro.orgSigned-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Rob Clark <robdclark@chromium.org>

drivers/gpu/drm/msm/hdmi/hdmi_phy_8996.c

@@ -691,15 +691,13 @@ static const struct clk_ops hdmi_8996_pll_ops = {
 	.is_enabled = hdmi_8996_pll_is_enabled,
 };
 
-static const char * const hdmi_pll_parents[] = {
-	"xo",
-};
-
 static const struct clk_init_data pll_init = {
 	.name = "hdmipll",
 	.ops = &hdmi_8996_pll_ops,
-	.parent_names = hdmi_pll_parents,
-	.num_parents = ARRAY_SIZE(hdmi_pll_parents),
+	.parent_data = (const struct clk_parent_data[]){
+		{ .fw_name = "xo", .name = "xo_board" },
+	},
+	.num_parents = 1,
 	.flags = CLK_IGNORE_UNUSED,
 };
 
@@ -707,8 +705,7 @@ int msm_hdmi_pll_8996_init(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct hdmi_pll_8996 *pll;
-	struct clk *clk;
-	int i;
+	int i, ret;
 
 	pll = devm_kzalloc(dev, sizeof(*pll), GFP_KERNEL);
 	if (!pll)
@@ -735,10 +732,16 @@ int msm_hdmi_pll_8996_init(struct platform_device *pdev)
 	}
 	pll->clk_hw.init = &pll_init;
 
-	clk = devm_clk_register(dev, &pll->clk_hw);
-	if (IS_ERR(clk)) {
+	ret = devm_clk_hw_register(dev, &pll->clk_hw);
+	if (ret) {
 		DRM_DEV_ERROR(dev, "failed to register pll clock\n");
-		return -EINVAL;
+		return ret;
+	}
+
+	ret = devm_of_clk_add_hw_provider(dev, of_clk_hw_simple_get, &pll->clk_hw);
+	if (ret) {
+		DRM_DEV_ERROR(dev, "%s: failed to register clk provider: %d\n", __func__, ret);
+		return ret;
 	}
 
 	return 0;