[RFC 3/3] clk: imx: Add blk-ctl driver for i.MX8MN

[Adam Ford]

This driver is intended to work with the multimedia block which
contains display and camera subsystems:
  LCDIF
  ISI
  MIPI CSI
  MIPI DSI

Signed-off-by: Adam Ford <aford173@xxxxxxxxx>
---
 drivers/clk/imx/clk-blk-ctl-imx8mn.c | 80 ++++++++++++++++++++++++++++
 1 file changed, 80 insertions(+)

diff --git a/drivers/clk/imx/clk-blk-ctl-imx8mn.c b/drivers/clk/imx/clk-blk-ctl-imx8mn.c
new file mode 100644
index 000000000000..917514212270
--- /dev/null
+++ b/drivers/clk/imx/clk-blk-ctl-imx8mn.c
@@ -0,0 +1,80 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2020 Compass Eletronics Group, LLC
+ */
+
+#include <dt-bindings/clock/imx8mn-clock.h>
+#include <dt-bindings/reset/imx8mn-reset.h>
+#include <linux/clk-provider.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of_address.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+
+#include "clk.h"
+#include "clk-blk-ctl.h"
+
+#define IMX_MEDIA_BLK_CTL_SFT_RSTN		0x0
+#define IMX_MEDIA_BLK_CTL_CLK_EN		0x4
+#define IMX_MEDIA_BLK_CTL_MIPI_RST		0x8
+
+static struct imx_blk_ctl_hw imx8mn_media_blk_ctl_hws[] = {
+	/* clocks */
+	IMX_BLK_CTL_CLK_GATE("mipi_dsi_pclk", IMX8MN_CLK_MEDIA_BLK_CTL_MIPI_DSI_PCLK, 0x4, 0, "dsi_core"),
+	IMX_BLK_CTL_CLK_GATE("mipi_dsi_clkref", IMX8MN_CLK_MEDIA_BLK_CTL_MIPI_DSI_CLKREF, 0x4, 1, "dsi_phy_ref"),
+	IMX_BLK_CTL_CLK_GATE("mipi_csi_pclk", IMX8MN_CLK_MEDIA_BLK_CTL_MIPI_CSI_PCLK, 0x4, 2, "camera_pixel_clk"),
+	IMX_BLK_CTL_CLK_GATE("mipi_csi_aclk", IMX8MN_CLK_MEDIA_BLK_CTL_MIPI_CSI_ACLK, 0x4, 3, "media_cam1_pix_root_clk"),
+	IMX_BLK_CTL_CLK_GATE("lcdif_pixel_clk", IMX8MN_CLK_MEDIA_BLK_CTL_LCDIF_PIXEL, 0x4, 4, "disp_pixel"),
+	IMX_BLK_CTL_CLK_GATE("lcdif_apb_clk", IMX8MN_CLK_MEDIA_BLK_CTL_LCDIF_APB, 0x4, 5, "disp_apb"),
+	IMX_BLK_CTL_CLK_GATE("isi_proc_clk", IMX8MN_CLK_MEDIA_BLK_CTL_ISI_PROC, 0x4, 6, "disp_axi_root_clk"),
+	IMX_BLK_CTL_CLK_GATE("isi_apb_clk", IMX8MN_CLK_MEDIA_BLK_CTL_ISI_APB, 0x4, 7, "disp_apb_root_clk"),
+	IMX_BLK_CTL_CLK_GATE("bus_blk_clk", IMX8MN_CLK_MEDIA_BLK_CTL_BUS_BLK, 0x4, 8, "disp_axi_root_clk"),
+	
+	/* resets */
+	IMX_BLK_CTL_RESET(IMX8MN_MEDIA_BLK_CTL_RESET_MIPI_DSI_PCLK, 0, 0),
+	IMX_BLK_CTL_RESET(IMX8MN_MEDIA_BLK_CTL_RESET_MIPI_DSI_CLKREF, 0, 1),
+	IMX_BLK_CTL_RESET(IMX8MN_MEDIA_BLK_CTL_RESET_MIPI_CSI_PCLK, 0, 2),
+	IMX_BLK_CTL_RESET(IMX8MN_MEDIA_BLK_CTL_RESET_MIPI_CSI_ACLK, 0, 3),
+	IMX_BLK_CTL_RESET(IMX8MN_MEDIA_BLK_CTL_RESET_LCDIF_PIXEL, 0, 4),
+	IMX_BLK_CTL_RESET(IMX8MN_MEDIA_BLK_CTL_RESET_LCDIF_APB, 0, 5),
+	IMX_BLK_CTL_RESET(IMX8MN_MEDIA_BLK_CTL_RESET_ISI_PROC, 0, 6),
+	IMX_BLK_CTL_RESET(IMX8MN_MEDIA_BLK_CTL_RESET_ISI_APB, 0, 7),
+	IMX_BLK_CTL_RESET(IMX8MN_MEDIA_BLK_CTL_RESET_BUS_BLK, 0, 8),
+	IMX_BLK_CTL_RESET(IMX8MN_MEDIA_BLK_CTL_RESET_MIPI_S_RESET, 0x8, 16),
+	IMX_BLK_CTL_RESET(IMX8MN_MEDIA_BLK_CTL_RESET_MIPI_M_RESET, 0x8, 17),
+};
+
+const struct imx_blk_ctl_dev_data imx8mn_media_blk_ctl_dev_data __initconst = {
+	.hws = imx8mn_media_blk_ctl_hws,
+	.hws_num = ARRAY_SIZE(imx8mn_media_blk_ctl_hws),
+	.clocks_max = IMX8MN_CLK_MEDIA_BLK_CTL_END,
+	.resets_max = IMX8MN_MEDIA_BLK_CTL_RESET_NUM,
+	.pm_runtime_saved_regs_num = 3,
+	.pm_runtime_saved_regs = {
+		IMX_MEDIA_BLK_CTL_SFT_RSTN,
+		IMX_MEDIA_BLK_CTL_CLK_EN,
+		IMX_MEDIA_BLK_CTL_MIPI_RST,
+	},
+};
+
+static const struct of_device_id imx8mn_blk_ctl_of_match[] = {
+	{
+		.compatible = "fsl,imx8mn-media-blk-ctl",
+		.data = &imx8mn_media_blk_ctl_dev_data
+	},
+	{ /* Sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, imx8mn_blk_ctl_of_match);
+
+static struct platform_driver imx_blk_ctl_driver = {
+	.probe = imx_blk_ctl_probe,
+	.driver = {
+		.name = "imx8mn-blk-ctl",
+		.of_match_table = of_match_ptr(imx8mn_blk_ctl_of_match),
+		.pm = &imx_blk_ctl_pm_ops,
+	},
+};
+module_platform_driver(imx_blk_ctl_driver);
-- 
2.25.1