OpenWrt – Rev 1

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--- a/drivers/misc/Makefile
+++ b/drivers/misc/Makefile
@@ -57,6 +57,7 @@ obj-$(CONFIG_CXL_BASE)                += cxl/
 obj-$(CONFIG_ASPEED_LPC_CTRL)  += aspeed-lpc-ctrl.o
 obj-$(CONFIG_ASPEED_LPC_SNOOP) += aspeed-lpc-snoop.o
 obj-$(CONFIG_PCI_ENDPOINT_TEST)        += pci_endpoint_test.o
+obj-$(CONFIG_SOC_MT7620)       += linkit.o
 
 lkdtm-$(CONFIG_LKDTM)          += lkdtm_core.o
 lkdtm-$(CONFIG_LKDTM)          += lkdtm_bugs.o
--- /dev/null
+++ b/drivers/misc/linkit.c
@@ -0,0 +1,84 @@
+/*
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License version 2 as
+ *  publishhed by the Free Software Foundation.
+ *
+ *  Copyright (C) 2015 John Crispin <blogic@openwrt.org>
+ */
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/of.h>
+#include <linux/mtd/mtd.h>
+#include <linux/gpio.h>
+
+#define LINKIT_LATCH_GPIO      11
+
+struct linkit_hw_data {
+       char board[16];
+       char rev[16];
+};
+
+static void sanify_string(char *s)
+{
+       int i;
+
+       for (i = 0; i < 15; i++)
+               if (s[i] <= 0x20)
+                       s[i] = '\0';
+       s[15] = '\0';
+}
+
+static int linkit_probe(struct platform_device *pdev)
+{
+       struct linkit_hw_data hw;
+       struct mtd_info *mtd;
+       size_t retlen;
+       int ret;
+
+       mtd = get_mtd_device_nm("factory");
+       if (IS_ERR(mtd))
+               return PTR_ERR(mtd);
+
+       ret = mtd_read(mtd, 0x400, sizeof(hw), &retlen, (u_char *) &hw);
+       put_mtd_device(mtd);
+
+       sanify_string(hw.board);
+       sanify_string(hw.rev);
+
+       dev_info(&pdev->dev, "Version  : %s\n", hw.board);
+       dev_info(&pdev->dev, "Revision : %s\n", hw.rev);
+
+       if (!strcmp(hw.board, "LINKITS7688")) {
+               dev_info(&pdev->dev, "setting up bootstrap latch\n");
+
+               if (devm_gpio_request(&pdev->dev, LINKIT_LATCH_GPIO, "bootstrap")) {
+                       dev_err(&pdev->dev, "failed to setup bootstrap gpio\n");
+                       return -1;
+               }
+               gpio_direction_output(LINKIT_LATCH_GPIO, 0);
+       }
+
+       return 0;
+}
+
+static const struct of_device_id linkit_match[] = {
+       { .compatible = "mediatek,linkit" },
+       {},
+};
+MODULE_DEVICE_TABLE(of, linkit_match);
+
+static struct platform_driver linkit_driver = {
+       .probe = linkit_probe,
+       .driver = {
+               .name = "mtk-linkit",
+               .owner = THIS_MODULE,
+               .of_match_table = linkit_match,
+       },
+};
+
+int __init linkit_init(void)
+{
+       return platform_driver_register(&linkit_driver);
+}
+late_initcall_sync(linkit_init);

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