* [PATCH AUTOSEL 5.4 30/31] powerpc/fsl: set fsl,i2c-erratum-a004447 flag for P2041 i2c controllers
[not found] <20210603170919.3169112-1-sashal@kernel.org>
@ 2021-06-03 17:09 ` Sasha Levin
2021-06-03 17:09 ` [PATCH AUTOSEL 5.4 31/31] powerpc/fsl: set fsl,i2c-erratum-a004447 flag for P1010 " Sasha Levin
1 sibling, 0 replies; 2+ messages in thread
From: Sasha Levin @ 2021-06-03 17:09 UTC (permalink / raw)
To: linux-kernel, stable
Cc: Chris Packham, Michael Ellerman, Wolfram Sang, Sasha Levin,
devicetree, linuxppc-dev
From: Chris Packham <chris.packham@alliedtelesis.co.nz>
[ Upstream commit 7adc7b225cddcfd0f346d10144fd7a3d3d9f9ea7 ]
The i2c controllers on the P2040/P2041 have an erratum where the
documented scheme for i2c bus recovery will not work (A-004447). A
different mechanism is needed which is documented in the P2040 Chip
Errata Rev Q (latest available at the time of writing).
Signed-off-by: Chris Packham <chris.packham@alliedtelesis.co.nz>
Acked-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
arch/powerpc/boot/dts/fsl/p2041si-post.dtsi | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff --git a/arch/powerpc/boot/dts/fsl/p2041si-post.dtsi b/arch/powerpc/boot/dts/fsl/p2041si-post.dtsi
index 872e4485dc3f..ddc018d42252 100644
--- a/arch/powerpc/boot/dts/fsl/p2041si-post.dtsi
+++ b/arch/powerpc/boot/dts/fsl/p2041si-post.dtsi
@@ -371,7 +371,23 @@ sdhc@114000 {
};
/include/ "qoriq-i2c-0.dtsi"
+ i2c@118000 {
+ fsl,i2c-erratum-a004447;
+ };
+
+ i2c@118100 {
+ fsl,i2c-erratum-a004447;
+ };
+
/include/ "qoriq-i2c-1.dtsi"
+ i2c@119000 {
+ fsl,i2c-erratum-a004447;
+ };
+
+ i2c@119100 {
+ fsl,i2c-erratum-a004447;
+ };
+
/include/ "qoriq-duart-0.dtsi"
/include/ "qoriq-duart-1.dtsi"
/include/ "qoriq-gpio-0.dtsi"
--
2.30.2
^ permalink raw reply related [flat|nested] 2+ messages in thread* [PATCH AUTOSEL 5.4 31/31] powerpc/fsl: set fsl,i2c-erratum-a004447 flag for P1010 i2c controllers
[not found] <20210603170919.3169112-1-sashal@kernel.org>
2021-06-03 17:09 ` [PATCH AUTOSEL 5.4 30/31] powerpc/fsl: set fsl,i2c-erratum-a004447 flag for P2041 i2c controllers Sasha Levin
@ 2021-06-03 17:09 ` Sasha Levin
1 sibling, 0 replies; 2+ messages in thread
From: Sasha Levin @ 2021-06-03 17:09 UTC (permalink / raw)
To: linux-kernel, stable
Cc: Chris Packham, Michael Ellerman, Wolfram Sang, Sasha Levin,
devicetree, linuxppc-dev
From: Chris Packham <chris.packham@alliedtelesis.co.nz>
[ Upstream commit 19ae697a1e4edf1d755b413e3aa38da65e2db23b ]
The i2c controllers on the P1010 have an erratum where the documented
scheme for i2c bus recovery will not work (A-004447). A different
mechanism is needed which is documented in the P1010 Chip Errata Rev L.
Signed-off-by: Chris Packham <chris.packham@alliedtelesis.co.nz>
Acked-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
arch/powerpc/boot/dts/fsl/p1010si-post.dtsi | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/arch/powerpc/boot/dts/fsl/p1010si-post.dtsi b/arch/powerpc/boot/dts/fsl/p1010si-post.dtsi
index 1b4aafc1f6a2..9716a0484ecf 100644
--- a/arch/powerpc/boot/dts/fsl/p1010si-post.dtsi
+++ b/arch/powerpc/boot/dts/fsl/p1010si-post.dtsi
@@ -122,7 +122,15 @@ memory-controller@2000 {
};
/include/ "pq3-i2c-0.dtsi"
+ i2c@3000 {
+ fsl,i2c-erratum-a004447;
+ };
+
/include/ "pq3-i2c-1.dtsi"
+ i2c@3100 {
+ fsl,i2c-erratum-a004447;
+ };
+
/include/ "pq3-duart-0.dtsi"
/include/ "pq3-espi-0.dtsi"
spi0: spi@7000 {
--
2.30.2
^ permalink raw reply related [flat|nested] 2+ messages in thread