layerscape: add patches-5.4

Add patches for linux-5.4. The patches are from NXP LSDK-20.04 release
which was tagged LSDK-20.04-V5.4.
https://source.codeaurora.org/external/qoriq/qoriq-components/linux/

For boards LS1021A-IOT, and Traverse-LS1043 which are not involved in
LSDK, port the dts patches from 4.14.

The patches are sorted into the following categories:
  301-arch-xxxx
  302-dts-xxxx
  303-core-xxxx
  701-net-xxxx
  801-audio-xxxx
  802-can-xxxx
  803-clock-xxxx
  804-crypto-xxxx
  805-display-xxxx
  806-dma-xxxx
  807-gpio-xxxx
  808-i2c-xxxx
  809-jailhouse-xxxx
  810-keys-xxxx
  811-kvm-xxxx
  812-pcie-xxxx
  813-pm-xxxx
  814-qe-xxxx
  815-sata-xxxx
  816-sdhc-xxxx
  817-spi-xxxx
  818-thermal-xxxx
  819-uart-xxxx
  820-usb-xxxx
  821-vfio-xxxx

Signed-off-by: Yangbo Lu <yangbo.lu@nxp.com>

1 files changed, 165 insertions, 0 deletions

diff --git a/target/linux/layerscape/patches-5.4/808-i2c-0014-i2c-mux-pca954x-support-property-idle-state.patch b/target/linux/layerscape/patches-5.4/808-i2c-0014-i2c-mux-pca954x-support-property-idle-state.patch
new file mode 100644
index 0000000000..4263717f43
--- /dev/null
+++ b/target/linux/layerscape/patches-5.4/808-i2c-0014-i2c-mux-pca954x-support-property-idle-state.patch
@@ -0,0 +1,165 @@
+From 5b51284db77e6383ff438b1dd21ee83bb6eaa895 Mon Sep 17 00:00:00 2001
+From: Biwen Li <biwen.li@nxp.com>
+Date: Tue, 22 Oct 2019 12:11:51 +0800
+Subject: [PATCH] i2c: mux: pca954x: support property idle-state
+
+This supports property idle-state,if present,
+overrides i2c-mux-idle-disconnect.
+
+My use cases:
+	- Use the property idle-state to fix
+	  an errata on LS2085ARDB and LS2088ARDB.
+	- Errata id: E-00013(board LS2085ARDB and
+	  LS2088ARDB revision on Rev.B, Rev.C and Rev.D).
+	- About E-00013:
+	  - Description: I2C1 and I2C3 buses
+	    are missing pull-up.
+	  - Impact: When the PCA954x device is tri-stated, the I2C bus
+	    will float. This makes the I2C bus and its associated
+	    downstream devices inaccessible.
+	  - Hardware fix: Populate resistors R189 and R190 for I2C1
+	    and resistors R228 and R229 for I2C3.
+	  - Software fix: Remove the tri-state option from the PCA954x
+	    driver(PCA954x always on enable status, specify a
+	    channel zero in dts to fix the errata E-00013).
+
+Tested-by: Ioana Ciornei <ioana.ciornei@nxp.com>
+Signed-off-by: Biwen Li <biwen.li@nxp.com>
+---
+ drivers/i2c/muxes/i2c-mux-pca954x.c | 69 ++++++++++++++++++++++++-------------
+ 1 file changed, 46 insertions(+), 23 deletions(-)
+
+--- a/drivers/i2c/muxes/i2c-mux-pca954x.c
++++ b/drivers/i2c/muxes/i2c-mux-pca954x.c
+@@ -87,7 +87,7 @@ struct pca954x {
+ 
+ 	u8 last_chan;		/* last register value */
+ 	/* MUX_IDLE_AS_IS, MUX_IDLE_DISCONNECT or >= 0 for channel */
+-	s8 idle_state;
++	s32 idle_state;
+ 
+ 	struct i2c_client *client;
+ 
+@@ -237,20 +237,23 @@ static int pca954x_reg_write(struct i2c_
+ 				I2C_SMBUS_BYTE, &dummy);
+ }
+ 
++static u8 pca954x_regval(struct pca954x *data, u8 chan)
++{
++	/* We make switches look like muxes, not sure how to be smarter. */
++	if (data->chip->muxtype == pca954x_ismux)
++		return chan | data->chip->enable;
++	else
++		return 1 << chan;
++}
++
+ static int pca954x_select_chan(struct i2c_mux_core *muxc, u32 chan)
+ {
+ 	struct pca954x *data = i2c_mux_priv(muxc);
+ 	struct i2c_client *client = data->client;
+-	const struct chip_desc *chip = data->chip;
+ 	u8 regval;
+ 	int ret = 0;
+ 
+-	/* we make switches look like muxes, not sure how to be smarter */
+-	if (chip->muxtype == pca954x_ismux)
+-		regval = chan | chip->enable;
+-	else
+-		regval = 1 << chan;
+-
++	regval = pca954x_regval(data, chan);
+ 	/* Only select the channel if its different from the last channel */
+ 	if (data->last_chan != regval) {
+ 		ret = pca954x_reg_write(muxc->parent, client, regval);
+@@ -264,7 +267,7 @@ static int pca954x_deselect_mux(struct i
+ {
+ 	struct pca954x *data = i2c_mux_priv(muxc);
+ 	struct i2c_client *client = data->client;
+-	s8 idle_state;
++	s32 idle_state;
+ 
+ 	idle_state = READ_ONCE(data->idle_state);
+ 	if (idle_state >= 0)
+@@ -410,6 +413,22 @@ static void pca954x_cleanup(struct i2c_m
+ 	i2c_mux_del_adapters(muxc);
+ }
+ 
++static int pca954x_init(struct i2c_client *client, struct pca954x *data)
++{
++	int ret;
++	if (data->idle_state >= 0) {
++		data->last_chan = pca954x_regval(data, data->idle_state);
++	} else {
++		/* Disconnect multiplexer */
++		data->last_chan = 0;
++	}
++	ret = i2c_smbus_write_byte(client, data->last_chan);
++	if (ret < 0)
++		data->last_chan = 0;
++
++	return ret;
++}
++
+ /*
+  * I2C init/probing/exit functions
+  */
+@@ -419,7 +438,6 @@ static int pca954x_probe(struct i2c_clie
+ 	struct i2c_adapter *adap = client->adapter;
+ 	struct device *dev = &client->dev;
+ 	struct device_node *np = dev->of_node;
+-	bool idle_disconnect_dt;
+ 	struct gpio_desc *gpio;
+ 	struct i2c_mux_core *muxc;
+ 	struct pca954x *data;
+@@ -470,23 +488,24 @@ static int pca954x_probe(struct i2c_clie
+ 		}
+ 	}
+ 
+-	/* Write the mux register at addr to verify
++	data->idle_state = MUX_IDLE_AS_IS;
++	if (of_property_read_u32(np, "idle-state", &data->idle_state)) {
++		if (np && of_property_read_bool(np, "i2c-mux-idle-disconnect"))
++			data->idle_state = MUX_IDLE_DISCONNECT;
++	}
++
++	/*
++	 * Write the mux register at addr to verify
+ 	 * that the mux is in fact present. This also
+-	 * initializes the mux to disconnected state.
++	 * initializes the mux to a channel
++	 * or disconnected state.
+ 	 */
+-	if (i2c_smbus_write_byte(client, 0) < 0) {
++	ret = pca954x_init(client, data);
++	if (ret < 0) {
+ 		dev_warn(dev, "probe failed\n");
+ 		return -ENODEV;
+ 	}
+ 
+-	data->last_chan = 0;		   /* force the first selection */
+-	data->idle_state = MUX_IDLE_AS_IS;
+-
+-	idle_disconnect_dt = np &&
+-		of_property_read_bool(np, "i2c-mux-idle-disconnect");
+-	if (idle_disconnect_dt)
+-		data->idle_state = MUX_IDLE_DISCONNECT;
+-
+ 	ret = pca954x_irq_setup(muxc);
+ 	if (ret)
+ 		goto fail_cleanup;
+@@ -538,9 +557,13 @@ static int pca954x_resume(struct device
+ 	struct i2c_client *client = to_i2c_client(dev);
+ 	struct i2c_mux_core *muxc = i2c_get_clientdata(client);
+ 	struct pca954x *data = i2c_mux_priv(muxc);
++	int ret;
+ 
+-	data->last_chan = 0;
+-	return i2c_smbus_write_byte(client, 0);
++	ret = pca954x_init(client, data);
++	if (ret < 0)
++		dev_err(&client->dev, "failed to verify the mux, the mux maybe not present in fact\n");
++
++	return ret;
+ }
+ #endif
+