ipq806x: disable i2c device on gsbi4

Patch cherry-picked from the following location:
https://chromium-review.googlesource.com/#/c/269931/

Disable the i2c device on gsbi4 and mark gsbi4_h and gsbi4_qup clks as
unused. If they are enabled, clock framework will turn them off at end
of probe. On ipq806x by design gsbi4_qup, gsbi4_h clks and i2c on gsbi4
are meant for RPM usage. So turning them off in kernel is incorrect.

Signed-off-by: Mathieu Olivari <mathieu@codeaurora.org>

SVN-Revision: 45728

1 files changed, 53 insertions, 0 deletions

diff --git a/target/linux/ipq806x/patches-3.18/023-ARM-dts-ipq806x-Disable-i2c-device-on-gsbi4.patch b/target/linux/ipq806x/patches-3.18/023-ARM-dts-ipq806x-Disable-i2c-device-on-gsbi4.patch
new file mode 100644
index 0000000000..319859b109
--- /dev/null
+++ b/target/linux/ipq806x/patches-3.18/023-ARM-dts-ipq806x-Disable-i2c-device-on-gsbi4.patch
@@ -0,0 +1,53 @@
+--- a/arch/arm/boot/dts/qcom-ipq8064-ap148.dts
++++ b/arch/arm/boot/dts/qcom-ipq8064-ap148.dts
+@@ -46,15 +46,12 @@
+ 			serial@16340000 {
+ 				status = "ok";
+ 			};
+-
+-			i2c4: i2c@16380000 {
+-				status = "ok";
+-
+-				clock-frequency = <200000>;
+-
+-				pinctrl-0 = <&i2c4_pins>;
+-				pinctrl-names = "default";
+-			};
++			/*
++			 * The i2c device on gsbi4 should not be enabled.
++			 * On ipq806x designs gsbi4 i2c is meant for exclusive
++			 * RPM usage. Turning this on in kernel manifests as
++			 * i2c failure for the RPM.
++			 */
+ 		};
+ 
+ 		gsbi5: gsbi@1a200000 {
+--- a/drivers/clk/qcom/gcc-ipq806x.c
++++ b/drivers/clk/qcom/gcc-ipq806x.c
+@@ -794,7 +794,7 @@ static struct clk_rcg gsbi7_qup_src = {
+ 			.parent_names = gcc_pxo_pll8,
+ 			.num_parents = 2,
+ 			.ops = &clk_rcg_ops,
+-			.flags = CLK_SET_PARENT_GATE,
++			.flags = CLK_SET_PARENT_GATE | CLK_IGNORE_UNUSED,
+ 		},
+ 	},
+ };
+@@ -810,7 +810,7 @@ static struct clk_branch gsbi7_qup_clk =
+ 			.parent_names = (const char *[]){ "gsbi7_qup_src" },
+ 			.num_parents = 1,
+ 			.ops = &clk_branch_ops,
+-			.flags = CLK_SET_RATE_PARENT,
++			.flags = CLK_SET_RATE_PARENT | CLK_IGNORE_UNUSED,
+ 		},
+ 	},
+ };
+@@ -858,7 +858,7 @@ static struct clk_branch gsbi4_h_clk = {
+ 		.hw.init = &(struct clk_init_data){
+ 			.name = "gsbi4_h_clk",
+ 			.ops = &clk_branch_ops,
+-			.flags = CLK_IS_ROOT,
++			.flags = CLK_IS_ROOT | CLK_IGNORE_UNUSED,
+ 		},
+ 	},
+ };