How to add 3G modem in Sabresx board

由 waterzhou 在 2014-6-30 上午2:05 上创建，最后由 waterzhou 在 2014-6-30 上午2:54 上修改

版本 4

Overview

The purpose of this document is to describe how to enable 3G modem in i.MX sabresx board for Android software.

Hardware Changes

Unlike other boards of I.mx series, in sabresx board  3G modem doesn't share to use PCIE slot any longer. It is not connected with PCIE slot by default. So if you still want to use 3G modem like in sabresd board. You need to do a tiny hardware rework. Like the below, R177 and R178 is DNP. Just add a zero resistor here.

Software patches

 

After you have do hardware rework above, then you should git am the attached patch to add software support which will add the dts config of 3G power. In our official release version, we don't include this patch.

From 7fb55cad18e2d482aa88fe6ed0ee552df6a813c2 Mon Sep 17 00:00:00 2001

From: Jianzheng Zhou <[e-mail]>
Date: Mon, 30 Jun 2014 17:31:03 +0800
Subject: [PATCH] Add 3G modem support


Signed-off-by: Jianzheng Zhou <[e-mail]>
---
 arch/arm/boot/dts/imx6sx-sdb.dts |  5 +++++
 arch/arm/mach-imx/mach-imx6sx.c  | 24 ++++++++++++++++++++++++
 2 files changed, 29 insertions(+)


diff --git a/arch/arm/boot/dts/imx6sx-sdb.dts b/arch/arm/boot/dts/imx6sx-sdb.dts
index 9c58768..aa1bd4d 100644
--- a/arch/arm/boot/dts/imx6sx-sdb.dts
+++ b/arch/arm/boot/dts/imx6sx-sdb.dts
@@ -146,6 +146,10 @@
  status = "okay";
  };
 
+    minipcie_ctrl {
+        power-on-gpio = <&gpio2 1 0>;
+    };
+
  bt_rfkill {
  compatible = "fsl,mxc_bt_rfkill";
  bt-power-gpios = <&gpio4 10 0>;
@@ -425,6 +429,7 @@
  hog {
  pinctrl_hog: hoggrp {
  fsl,pins = <
+ MX6SX_PAD_ENET1_CRS__GPIO2_IO_1 0x80000000
  MX6SX_PAD_ENET2_COL__GPIO2_IO_6 0x80000000
  MX6SX_PAD_QSPI1A_DATA0__GPIO4_IO_16 0x80000000
  MX6SX_PAD_QSPI1A_DATA3__GPIO4_IO_19 0x80000000
diff --git a/arch/arm/mach-imx/mach-imx6sx.c b/arch/arm/mach-imx/mach-imx6sx.c
index c5a8ef3..6bfca53 100644
--- a/arch/arm/mach-imx/mach-imx6sx.c
+++ b/arch/arm/mach-imx/mach-imx6sx.c
@@ -223,6 +223,29 @@ static void __init imx6sx_enet_plt_init(void)
  if (np && of_get_property(np, "fsl,magic-packet", NULL))
  fec_pdata[1].sleep_mode_enable = imx6sx_fec2_stop_enable;
 }
+/*
+ * Init GPIO PCIE_PWR_EN to keep power supply to miniPCIE 3G modem
+ *
+ */
+static void __init imx6sx_mini_pcie_init(void)
+{
+ struct device_node *np = NULL;
+ int ret, power_on_gpio;
+ np = of_find_node_by_name(NULL, "minipcie_ctrl");
+ if (!np)
+ return;
+
+ power_on_gpio = of_get_named_gpio(np, "power-on-gpio", 0);
+ if (gpio_is_valid(power_on_gpio)) {
+ ret = gpio_request_one(power_on_gpio,
+ GPIOF_OUT_INIT_HIGH,
+ "miniPCIE Power On");
+ pr_warn("!!request miniPCIE Power On gpio\n");
+ if (ret)
+ pr_warn("failed to request miniPCIE Power On gpio\n");
+ }
+}
+
 
 static inline void imx6sx_enet_init(void)
 {
@@ -276,6 +299,7 @@ static void __init imx6sx_init_machine(void)
  imx_anatop_init();
  imx6_pm_init();
  imx6sx_qos_init();
+ imx6sx_mini_pcie_init();
 }
 
 static void __init imx6sx_opp_init(struct device *cpu_dev)
-- 
1.8.0