From: Lad Prabhakar <prabhakar.mahadev-lad...@bp.renesas.com> Add LPCLK clock handling to the RZ/G2L MIPI DSI driver to support proper DSI timing parameter configuration on RZ/V2H SoCs. While lpclk is present on both RZ/G2L and RZ/V2H SoCs, the RZ/V2H SoC specifically uses the lpclk rate to configure the DSI timing parameter ULPSEXIT.
Introduce a new lpclk field in the rzg2l_mipi_dsi structure and acquire the "lpclk" clock during probe to enable lpclk rate-based timing calculations on RZ/V2H while maintaining compatibility with RZ/G2L. Co-developed-by: Fabrizio Castro <fabrizio.castro...@renesas.com> Signed-off-by: Fabrizio Castro <fabrizio.castro...@renesas.com> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad...@bp.renesas.com> Reviewed-by: Biju Das <biju.das...@bp.renesas.com> --- v7->v8: - Updated commit message - Switched to use devm_clk_get() instead of devm_clk_get_optional() as lpclk clock is available on all SoCs. v6->v7: - New patch Note, this patch was previously part of series [0]. [0] https://lore.kernel.org/all/20250609225630.502888-1-prabhakar.mahadev-lad...@bp.renesas.com/ --- drivers/gpu/drm/renesas/rz-du/rzg2l_mipi_dsi.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/gpu/drm/renesas/rz-du/rzg2l_mipi_dsi.c b/drivers/gpu/drm/renesas/rz-du/rzg2l_mipi_dsi.c index 3b52dfc0ea1e..bb03b49b1e85 100644 --- a/drivers/gpu/drm/renesas/rz-du/rzg2l_mipi_dsi.c +++ b/drivers/gpu/drm/renesas/rz-du/rzg2l_mipi_dsi.c @@ -68,6 +68,7 @@ struct rzg2l_mipi_dsi { struct drm_bridge *next_bridge; struct clk *vclk; + struct clk *lpclk; enum mipi_dsi_pixel_format format; unsigned int num_data_lanes; @@ -979,6 +980,10 @@ static int rzg2l_mipi_dsi_probe(struct platform_device *pdev) if (IS_ERR(dsi->vclk)) return PTR_ERR(dsi->vclk); + dsi->lpclk = devm_clk_get(dsi->dev, "lpclk"); + if (IS_ERR(dsi->lpclk)) + return PTR_ERR(dsi->lpclk); + dsi->rstc = devm_reset_control_get_optional_exclusive(dsi->dev, "rst"); if (IS_ERR(dsi->rstc)) return dev_err_probe(dsi->dev, PTR_ERR(dsi->rstc), -- 2.51.0
