From dcb1b7b6449e82a79b06e31af052628c3d58dc70 Mon Sep 17 00:00:00 2001
From: Marek Vasut <marex@denx.de>
Date: Tue, 25 Jun 2024 10:26:15 +0200
Subject: [PATCH] ARM: imx: verdin-imx8mm: Set CAN oscillator frequency based
on model
The older i.MX8M Mini Verdin SoMs may came with 20 MHz SPI CAN controller
oscillator, the newer SoMs always use 40 MHz oscillator. Handle both by
overriding the oscillator frequency just before booting the kernel.
These are the known variants with 20 MHz oscillator:
- 0055, V1.1A, V1.1B, V1.1C and V1.1D, use a 20MHz oscillator
- 0059, V1.1A and V1.1B, use a 20MHz oscillator
Signed-off-by: Marek Vasut <marex@denx.de>
Reviewed-by: Francesco Dolcini <francesco.dolcini@toradex.com>
---
board/toradex/verdin-imx8mm/verdin-imx8mm.c | 29 +++++++++++++++++++++
1 file changed, 29 insertions(+)
diff --git a/board/toradex/verdin-imx8mm/verdin-imx8mm.c b/board/toradex/verdin-imx8mm/verdin-imx8mm.c
index 4230f417d1..9359e0ac6b 100644
--- a/board/toradex/verdin-imx8mm/verdin-imx8mm.c
+++ b/board/toradex/verdin-imx8mm/verdin-imx8mm.c
@@ -126,6 +126,35 @@ int board_phys_sdram_size(phys_size_t *size)
#if defined(CONFIG_OF_LIBFDT) && defined(CONFIG_OF_BOARD_SETUP)
int ft_board_setup(void *blob, struct bd_info *bd)
{
+ const char *canoscpath = "/oscillator";
+ int freq = 40000000; /* 40 MHz is used on most variants */
+ int canoscoff, ret;
+
+ canoscoff = fdt_path_offset(blob, canoscpath);
+ if (canoscoff < 0) /* No CAN oscillator found. */
+ goto exit;
+
+ /*
+ * The following "prodid" (PID4 in Toradex naming) use
+ * a 20MHz CAN oscillator:
+ * - 0055, V1.1A, V1.1B, V1.1C and V1.1D
+ * - 0059, V1.1A and V1.1B
+ */
+ if ((tdx_hw_tag.ver_major == 1 && tdx_hw_tag.ver_minor == 1) &&
+ ((tdx_hw_tag.prodid == VERDIN_IMX8MMQ_IT &&
+ tdx_hw_tag.ver_assembly <= 1) || /* 0059 rev. A or B */
+ (tdx_hw_tag.prodid == VERDIN_IMX8MMQ_WIFI_BT_IT &&
+ tdx_hw_tag.ver_assembly <= 3))) { /* 0055 rev. A/B/C/D */
+ freq = 20000000;
+ }
+
+ ret = fdt_setprop_u32(blob, canoscoff, "clock-frequency", freq);
+ if (ret < 0) {
+ printf("Failed to set CAN oscillator clock-frequency, ret=%d\n",
+ ret);
+ }
+
+exit:
return ft_common_board_setup(blob, bd);
}
#endif
--
2.39.5