[PATCHv1 0/6] Support for GE B1x5v2

[PATCHv1 0/6] Support for GE B1x5v2

[Sebastian Reichel]

Hi,

This series adds support for another General Electric patient
monitor series (similar to existing Bx50v3), which is based on
i.MX6DL using Congatec's QMX6 module.

The module uses an I2C RTC to provide the i.MX6 32768 Hz clock,
so it's important to keep it enabled. Not doing so results in
incorrect timings of watchdog and i.MX6 RTC. The bootloader
enables the watchdog, so disabling the clock results in system
reboot. [0]

The second patch is required for B155v2, which uses a 1366x768
G156XTN01 panel. The 1366 width is not supported by the display
pipeline and result in boot hanging without the patch. [1]

Patches 3+4 are updating DT bindings for the new board compatible
values.

Patch 5 adds missing sst25vf032b to spi-nor bindings. Checkpatch
still complains, since the binding lists all chips without vendor
prefix. This probably should be fixed when the files is moved to
YAML, but is non-trivial since those chips are manufactured by
multiple vendors. E.g. sst25vf032b can be sourced from at least
sst and microchip.

Finally patch 6 adds the board files.

Thanks,

[0] There has been a discussion for the problem on the mailinglists
last year. The discussion died off, when I told people their ideas
don't work. I hope using protected-clocks is fine for this usecase.

https://lore.kernel.org/linux-clk/20191108170135.9053-1-sebastian.reichel@collabora.com/

[1] I've sent this before as a separate patch in September, but
nobody seemed to care. This adds full context for the problem.

https://lore.kernel.org/dri-devel/20200910162831.321556-1-sebastian.reichel@collabora.com/

-- Sebastian

Sebastian Reichel (6):
  rtc: m41t80: add support for protected clock
  drm/imx: Add 8 pixel alignment fix
  dt-bindings: vendor-prefixes: add congatec
  dt-bindings: arm: fsl: add GE B1x5pv2 boards
  dt-bindings: mtd: jedec,spi-nor: add sst25vf032b
  ARM: dts: imx6: Add GE B1x5v2

 .../devicetree/bindings/arm/fsl.yaml          |  11 +
 .../devicetree/bindings/mtd/jedec,spi-nor.txt |   1 +
 .../devicetree/bindings/rtc/rtc-m41t80.txt    |   1 +
 .../devicetree/bindings/vendor-prefixes.yaml  |   2 +
 arch/arm/boot/dts/Makefile                    |   5 +
 arch/arm/boot/dts/imx6dl-b105pv2.dts          |  35 +
 arch/arm/boot/dts/imx6dl-b105v2.dts           |  35 +
 arch/arm/boot/dts/imx6dl-b125pv2.dts          |  33 +
 arch/arm/boot/dts/imx6dl-b125v2.dts           |  33 +
 arch/arm/boot/dts/imx6dl-b155v2.dts           |  36 +
 arch/arm/boot/dts/imx6dl-b1x5pv2.dtsi         | 434 ++++++++++++
 arch/arm/boot/dts/imx6dl-b1x5v2.dtsi          |  61 ++
 arch/arm/boot/dts/imx6dl-qmx6.dtsi            | 623 ++++++++++++++++++
 drivers/gpu/drm/imx/imx-drm-core.c            |  19 +-
 drivers/gpu/drm/imx/imx-ldb.c                 |   5 +
 drivers/gpu/drm/imx/ipuv3-crtc.c              |  11 +-
 drivers/gpu/drm/imx/ipuv3-plane.c             |  19 +-
 drivers/gpu/ipu-v3/ipu-dc.c                   |   5 +
 drivers/gpu/ipu-v3/ipu-di.c                   |   7 +
 drivers/rtc/rtc-m41t80.c                      |   3 +
 20 files changed, 1373 insertions(+), 6 deletions(-)
 create mode 100644 arch/arm/boot/dts/imx6dl-b105pv2.dts
 create mode 100644 arch/arm/boot/dts/imx6dl-b105v2.dts
 create mode 100644 arch/arm/boot/dts/imx6dl-b125pv2.dts
 create mode 100644 arch/arm/boot/dts/imx6dl-b125v2.dts
 create mode 100644 arch/arm/boot/dts/imx6dl-b155v2.dts
 create mode 100644 arch/arm/boot/dts/imx6dl-b1x5pv2.dtsi
 create mode 100644 arch/arm/boot/dts/imx6dl-b1x5v2.dtsi
 create mode 100644 arch/arm/boot/dts/imx6dl-qmx6.dtsi

-- 
2.30.0

[PATCHv1 1/6] rtc: m41t80: add support for protected clock

[Sebastian Reichel]

Congatec's QMX6 system on module (SoM) uses a m41t62 as RTC. The
modules SQW clock output defaults to 32768 Hz. This behaviour is
used to provide the i.MX6 CKIL clock. Once the RTC driver is probed,
the clock is disabled and all i.MX6 functionality depending on
the 32 KHz clock has undefined behaviour. On systems using hardware
watchdog it seems to likely trigger a lot earlier than configured.

The proper solution would be to describe this dependency in DT,
but that will result in a deadlock. The kernel will see, that
i.MX6 system clock needs the RTC clock and do probe deferral.
But the i.MX6 I2C module never becomes usable without the i.MX6
CKIL clock and thus the RTC's clock will not be probed. So from
the kernel's perspective this is a chicken-and-egg problem.

Technically everything is fine by not touching anything, since
the RTC clock correctly enables the clock on reset (i.e. on
battery backup power loss) and also the bootloader enables it
in case a kernel without this support has been booted.

The 'protected-clocks' property is already in use for some clocks
that may not be touched because of firmware limitations and is
described in Documentation/devicetree/bindings/clock/clock-bindings.txt.

Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
---
 Documentation/devicetree/bindings/rtc/rtc-m41t80.txt | 1 +
 drivers/rtc/rtc-m41t80.c                             | 3 +++
 2 files changed, 4 insertions(+)

diff --git a/Documentation/devicetree/bindings/rtc/rtc-m41t80.txt b/Documentation/devicetree/bindings/rtc/rtc-m41t80.txt
index c746cb221210..ea4bbf5c4282 100644
--- a/Documentation/devicetree/bindings/rtc/rtc-m41t80.txt
+++ b/Documentation/devicetree/bindings/rtc/rtc-m41t80.txt
@@ -19,6 +19,7 @@ Optional properties:
 - interrupts: rtc alarm interrupt.
 - clock-output-names: From common clock binding to override the default output
                       clock name
+- protected-clocks: Bool, if set operating system should not handle clock.
 - wakeup-source: Enables wake up of host system on alarm
 
 Example:
diff --git a/drivers/rtc/rtc-m41t80.c b/drivers/rtc/rtc-m41t80.c
index 160dcf68e64e..3296583853a8 100644
--- a/drivers/rtc/rtc-m41t80.c
+++ b/drivers/rtc/rtc-m41t80.c
@@ -546,6 +546,9 @@ static struct clk *m41t80_sqw_register_clk(struct m41t80_data *m41t80)
 	struct clk_init_data init;
 	int ret;
 
+	if (of_property_read_bool(node, "protected-clocks"))
+		return 0;
+
 	/* First disable the clock */
 	ret = i2c_smbus_read_byte_data(client, M41T80_REG_ALARM_MON);
 	if (ret < 0)
-- 
2.30.0

[PATCHv1 2/6] drm/imx: Add 8 pixel alignment fix

[Sebastian Reichel]

Some standard resolutions like 1366x768 do not work properly with
i.MX6 SoCs, since the horizontal resolution needs to be aligned
to 8 pixels (so 1360x768 or 1368x768 would work).

This patch allocates framebuffers allocated to 8 pixels. The extra
time required to send the extra pixels are removed from the blank
time. In order to expose the correct display size to userspace,
the stride is increased without increasing the width.

Suggested-by: Boris Brezillon <boris.brezillon@collabora.com>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
---
 drivers/gpu/drm/imx/imx-drm-core.c | 19 ++++++++++++++++++-
 drivers/gpu/drm/imx/imx-ldb.c      |  5 +++++
 drivers/gpu/drm/imx/ipuv3-crtc.c   | 11 ++++++++++-
 drivers/gpu/drm/imx/ipuv3-plane.c  | 19 +++++++++++++++----
 drivers/gpu/ipu-v3/ipu-dc.c        |  5 +++++
 drivers/gpu/ipu-v3/ipu-di.c        |  7 +++++++
 6 files changed, 60 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/imx/imx-drm-core.c b/drivers/gpu/drm/imx/imx-drm-core.c
index d1a9841adeed..1bcf740b7f4f 100644
--- a/drivers/gpu/drm/imx/imx-drm-core.c
+++ b/drivers/gpu/drm/imx/imx-drm-core.c
@@ -145,9 +145,26 @@ static const struct drm_ioctl_desc imx_drm_ioctls[] = {
 	/* none so far */
 };
 
+static int imx_drm_dumb_create(struct drm_file *file_priv,
+			       struct drm_device *drm,
+			       struct drm_mode_create_dumb *args)
+{
+	u32 width = args->width;
+	int ret;
+
+	args->width = ALIGN(width, 8);
+
+	ret = drm_gem_cma_dumb_create(file_priv, drm, args);
+	if (ret)
+		return ret;
+
+	args->width = width;
+	return ret;
+}
+
 static const struct drm_driver imx_drm_driver = {
 	.driver_features	= DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC,
-	DRM_GEM_CMA_DRIVER_OPS,
+	DRM_GEM_CMA_DRIVER_OPS_WITH_DUMB_CREATE(imx_drm_dumb_create),
 	.ioctls			= imx_drm_ioctls,
 	.num_ioctls		= ARRAY_SIZE(imx_drm_ioctls),
 	.fops			= &imx_drm_driver_fops,
diff --git a/drivers/gpu/drm/imx/imx-ldb.c b/drivers/gpu/drm/imx/imx-ldb.c
index 41e2978cb1eb..9c7710c719d7 100644
--- a/drivers/gpu/drm/imx/imx-ldb.c
+++ b/drivers/gpu/drm/imx/imx-ldb.c
@@ -257,6 +257,11 @@ imx_ldb_encoder_atomic_mode_set(struct drm_encoder *encoder,
 			 "%s: mode exceeds 85 MHz pixel clock\n", __func__);
 	}
 
+	if (!IS_ALIGNED(mode->hdisplay, 8)) {
+		dev_warn(ldb->dev,
+			 "%s: hdisplay does not align to 8 byte\n", __func__);
+	}
+
 	if (dual) {
 		serial_clk = 3500UL * mode->clock;
 		imx_ldb_set_clock(ldb, mux, 0, serial_clk, di_clk);
diff --git a/drivers/gpu/drm/imx/ipuv3-crtc.c b/drivers/gpu/drm/imx/ipuv3-crtc.c
index 7ebd99ee3240..1ab970bcd52b 100644
--- a/drivers/gpu/drm/imx/ipuv3-crtc.c
+++ b/drivers/gpu/drm/imx/ipuv3-crtc.c
@@ -305,10 +305,19 @@ static void ipu_crtc_mode_set_nofb(struct drm_crtc *crtc)
 	sig_cfg.vsync_pin = imx_crtc_state->di_vsync_pin;
 
 	drm_display_mode_to_videomode(mode, &sig_cfg.mode);
+	if (!IS_ALIGNED(sig_cfg.mode.hactive, 8)) {
+		unsigned int new_hactive = ALIGN(sig_cfg.mode.hactive, 8);
+
+		dev_warn(ipu_crtc->dev, "8-pixel align hactive %d -> %d\n",
+			 sig_cfg.mode.hactive, new_hactive);
+
+		sig_cfg.mode.hfront_porch = new_hactive - sig_cfg.mode.hactive;
+		sig_cfg.mode.hactive = new_hactive;
+	}
 
 	ipu_dc_init_sync(ipu_crtc->dc, ipu_crtc->di,
 			 mode->flags & DRM_MODE_FLAG_INTERLACE,
-			 imx_crtc_state->bus_format, mode->hdisplay);
+			 imx_crtc_state->bus_format, sig_cfg.mode.hactive);
 	ipu_di_init_sync_panel(ipu_crtc->di, &sig_cfg);
 }
 
diff --git a/drivers/gpu/drm/imx/ipuv3-plane.c b/drivers/gpu/drm/imx/ipuv3-plane.c
index 8a4235d9d9f1..5dd43e8c4d9e 100644
--- a/drivers/gpu/drm/imx/ipuv3-plane.c
+++ b/drivers/gpu/drm/imx/ipuv3-plane.c
@@ -29,6 +29,11 @@ to_ipu_plane_state(struct drm_plane_state *p)
 	return container_of(p, struct ipu_plane_state, base);
 }
 
+static unsigned int ipu_src_rect_width(const struct drm_plane_state *state)
+{
+	return ALIGN(drm_rect_width(&state->src) >> 16, 8);
+}
+
 static inline struct ipu_plane *to_ipu_plane(struct drm_plane *p)
 {
 	return container_of(p, struct ipu_plane, base);
@@ -418,6 +423,12 @@ static int ipu_plane_atomic_check(struct drm_plane *plane,
 	if (old_fb && fb->pitches[0] != old_fb->pitches[0])
 		crtc_state->mode_changed = true;
 
+	if (ALIGN(fb->width, 8) * fb->format->cpp[0] >
+	    fb->pitches[0] + fb->offsets[0]) {
+		dev_warn(dev, "pitch is not big enough for 8 pixels alignment");
+		return -EINVAL;
+	}
+
 	switch (fb->format->format) {
 	case DRM_FORMAT_YUV420:
 	case DRM_FORMAT_YVU420:
@@ -590,7 +601,7 @@ static void ipu_plane_atomic_update(struct drm_plane *plane,
 	if (ipu_state->use_pre) {
 		axi_id = ipu_chan_assign_axi_id(ipu_plane->dma);
 		ipu_prg_channel_configure(ipu_plane->ipu_ch, axi_id,
-					  drm_rect_width(&state->src) >> 16,
+					  ipu_src_rect_width(state),
 					  drm_rect_height(&state->src) >> 16,
 					  fb->pitches[0], fb->format->format,
 					  fb->modifier, &eba);
@@ -623,9 +634,9 @@ static void ipu_plane_atomic_update(struct drm_plane *plane,
 		break;
 	}
 
-	ipu_dmfc_config_wait4eot(ipu_plane->dmfc, drm_rect_width(dst));
+	ipu_dmfc_config_wait4eot(ipu_plane->dmfc, ALIGN(drm_rect_width(dst), 8));
 
-	width = drm_rect_width(&state->src) >> 16;
+	width = ipu_src_rect_width(state);
 	height = drm_rect_height(&state->src) >> 16;
 	info = drm_format_info(fb->format->format);
 	ipu_calculate_bursts(width, info->cpp[0], fb->pitches[0],
@@ -689,7 +700,7 @@ static void ipu_plane_atomic_update(struct drm_plane *plane,
 
 		ipu_cpmem_zero(ipu_plane->alpha_ch);
 		ipu_cpmem_set_resolution(ipu_plane->alpha_ch,
-					 drm_rect_width(&state->src) >> 16,
+					 ipu_src_rect_width(state),
 					 drm_rect_height(&state->src) >> 16);
 		ipu_cpmem_set_format_passthrough(ipu_plane->alpha_ch, 8);
 		ipu_cpmem_set_high_priority(ipu_plane->alpha_ch);
diff --git a/drivers/gpu/ipu-v3/ipu-dc.c b/drivers/gpu/ipu-v3/ipu-dc.c
index 34b4075a6a8e..ca96b235491a 100644
--- a/drivers/gpu/ipu-v3/ipu-dc.c
+++ b/drivers/gpu/ipu-v3/ipu-dc.c
@@ -167,6 +167,11 @@ int ipu_dc_init_sync(struct ipu_dc *dc, struct ipu_di *di, bool interlaced,
 
 	dc->di = ipu_di_get_num(di);
 
+	if (!IS_ALIGNED(width, 8)) {
+		dev_warn(priv->dev,
+			 "%s: hactive does not align to 8 byte\n", __func__);
+	}
+
 	map = ipu_bus_format_to_map(bus_format);
 
 	/*
diff --git a/drivers/gpu/ipu-v3/ipu-di.c b/drivers/gpu/ipu-v3/ipu-di.c
index b4a31d506fcc..f914e794a64e 100644
--- a/drivers/gpu/ipu-v3/ipu-di.c
+++ b/drivers/gpu/ipu-v3/ipu-di.c
@@ -510,6 +510,13 @@ int ipu_di_adjust_videomode(struct ipu_di *di, struct videomode *mode)
 {
 	u32 diff;
 
+	if (!IS_ALIGNED(mode->hactive, 8) &&
+	    mode->hfront_porch < ALIGN(mode->hactive, 8) - mode->hactive) {
+		dev_err(di->ipu->dev, "hactive %d is not aligned to 8 and front porch is too small to compensate\n",
+			mode->hactive);
+		return -EINVAL;
+	}
+
 	if (mode->vfront_porch >= 2)
 		return 0;
 
-- 
2.30.0

[PATCHv1 3/6] dt-bindings: vendor-prefixes: add congatec

[Sebastian Reichel]

Document binding for congatec.

Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
---
 Documentation/devicetree/bindings/vendor-prefixes.yaml | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Documentation/devicetree/bindings/vendor-prefixes.yaml b/Documentation/devicetree/bindings/vendor-prefixes.yaml
index 041ae90b0d8f..a32db51df6c8 100644
--- a/Documentation/devicetree/bindings/vendor-prefixes.yaml
+++ b/Documentation/devicetree/bindings/vendor-prefixes.yaml
@@ -239,6 +239,8 @@ patternProperties:
     description: Colorful GRP, Shenzhen Xueyushi Technology Ltd.
   "^compulab,.*":
     description: CompuLab Ltd.
+  "^congatec,.*":
+    description: congatec GmbH
   "^coreriver,.*":
     description: CORERIVER Semiconductor Co.,Ltd.
   "^corpro,.*":
-- 
2.30.0

[PATCHv1 4/6] dt-bindings: arm: fsl: add GE B1x5pv2 boards

[Sebastian Reichel]

Document the compatible for GE B1x5pv2 boards.

Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
---
 Documentation/devicetree/bindings/arm/fsl.yaml | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/Documentation/devicetree/bindings/arm/fsl.yaml b/Documentation/devicetree/bindings/arm/fsl.yaml
index 34000f7fbe02..dd2b566314a0 100644
--- a/Documentation/devicetree/bindings/arm/fsl.yaml
+++ b/Documentation/devicetree/bindings/arm/fsl.yaml
@@ -393,6 +393,17 @@ properties:
           - const: armadeus,imx6dl-apf6         # APF6 (Solo) SoM
           - const: fsl,imx6dl
 
+      - description: i.MX6DL based congatec QMX6 Boards
+        items:
+          - enum:
+              - ge,imx6dl-b105v2          # General Electric B105v2
+              - ge,imx6dl-b105pv2         # General Electric B105Pv2
+              - ge,imx6dl-b125v2          # General Electric B125v2
+              - ge,imx6dl-b125pv2         # General Electric B125Pv2
+              - ge,imx6dl-b155v2          # General Electric B155v2
+          - const: congatec,qmx6
+          - const: fsl,imx6dl
+
       - description: i.MX6DL based DFI FS700-M60-6DL Board
         items:
           - const: dfi,fs700-m60-6dl
-- 
2.30.0

[PATCHv1 5/6] dt-bindings: mtd: jedec,spi-nor: add sst25vf032b

[Sebastian Reichel]

The binding is already used by the driver. Update documentation
accordingly.

Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
---
 Documentation/devicetree/bindings/mtd/jedec,spi-nor.txt | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Documentation/devicetree/bindings/mtd/jedec,spi-nor.txt b/Documentation/devicetree/bindings/mtd/jedec,spi-nor.txt
index f03be904d3c2..40e626e82ed0 100644
--- a/Documentation/devicetree/bindings/mtd/jedec,spi-nor.txt
+++ b/Documentation/devicetree/bindings/mtd/jedec,spi-nor.txt
@@ -31,6 +31,7 @@ Required properties:
                  s25sl12801
                  s25fl008k
                  s25fl064k
+                 sst25vf032b
                  sst25vf040b
                  m25p40
                  m25p80
-- 
2.30.0

[PATCHv1 6/6] ARM: dts: imx6: Add GE B1x5v2

[Sebastian Reichel]

This adds device tree files for the General Electric Healthcare
(GEHC) B1x5v2 series. All models make use of Congatec's QMX6 module,
which is described in its own device tree include, so that it can
also be used by other boards.

Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
---
 arch/arm/boot/dts/Makefile            |   5 +
 arch/arm/boot/dts/imx6dl-b105pv2.dts  |  35 ++
 arch/arm/boot/dts/imx6dl-b105v2.dts   |  35 ++
 arch/arm/boot/dts/imx6dl-b125pv2.dts  |  33 ++
 arch/arm/boot/dts/imx6dl-b125v2.dts   |  33 ++
 arch/arm/boot/dts/imx6dl-b155v2.dts   |  36 ++
 arch/arm/boot/dts/imx6dl-b1x5pv2.dtsi | 434 ++++++++++++++++++
 arch/arm/boot/dts/imx6dl-b1x5v2.dtsi  |  61 +++
 arch/arm/boot/dts/imx6dl-qmx6.dtsi    | 623 ++++++++++++++++++++++++++
 9 files changed, 1295 insertions(+)
 create mode 100644 arch/arm/boot/dts/imx6dl-b105pv2.dts
 create mode 100644 arch/arm/boot/dts/imx6dl-b105v2.dts
 create mode 100644 arch/arm/boot/dts/imx6dl-b125pv2.dts
 create mode 100644 arch/arm/boot/dts/imx6dl-b125v2.dts
 create mode 100644 arch/arm/boot/dts/imx6dl-b155v2.dts
 create mode 100644 arch/arm/boot/dts/imx6dl-b1x5pv2.dtsi
 create mode 100644 arch/arm/boot/dts/imx6dl-b1x5v2.dtsi
 create mode 100644 arch/arm/boot/dts/imx6dl-qmx6.dtsi

diff --git a/arch/arm/boot/dts/Makefile b/arch/arm/boot/dts/Makefile
index 3d1ea0b25168..cd6bf51d27ec 100644
--- a/arch/arm/boot/dts/Makefile
+++ b/arch/arm/boot/dts/Makefile
@@ -513,6 +513,11 @@ dtb-$(CONFIG_SOC_IMX6Q) += \
 	imx6q-dms-ba16.dtb \
 	imx6q-emcon-avari.dtb \
 	imx6q-evi.dtb \
+	imx6dl-b105v2.dtb \
+	imx6dl-b105pv2.dtb \
+	imx6dl-b125v2.dtb \
+	imx6dl-b125pv2.dtb \
+	imx6dl-b155v2.dtb \
 	imx6q-gk802.dtb \
 	imx6q-gw51xx.dtb \
 	imx6q-gw52xx.dtb \
diff --git a/arch/arm/boot/dts/imx6dl-b105pv2.dts b/arch/arm/boot/dts/imx6dl-b105pv2.dts
new file mode 100644
index 000000000000..0d5be2f9471f
--- /dev/null
+++ b/arch/arm/boot/dts/imx6dl-b105pv2.dts
@@ -0,0 +1,35 @@
+// SPDX-License-Identifier: GPL-2.0 or MIT
+//
+// Device Tree Source for General Electric B105Pv2
+//
+// Copyright 2018-2021 General Electric Company
+// Copyright 2018-2021 Collabora
+
+/dts-v1/;
+#include "imx6dl-b1x5pv2.dtsi"
+
+/ {
+	model = "General Electric B105Pv2";
+	compatible = "ge,imx6dl-b105pv2", "congatec,qmx6", "fsl,imx6dl";
+
+	panel {
+		compatible = "auo,g101evn010";
+		status = "okay";
+	};
+};
+
+&i2c3 {
+	touchscreen@41 {
+		reg = <0x41>;
+		compatible = "ilitek,ili251x";
+
+		pinctrl-names = "default";
+		pinctrl-0 =<&pinctrl_q7_gpio0>;
+		interrupt-parent = <&gpio5>;
+		interrupts = <2 IRQ_TYPE_EDGE_FALLING>;
+		reset-gpios = <&tca6424a 21 GPIO_ACTIVE_LOW>;
+
+		touchscreen-size-x = <1280>;
+		touchscreen-size-y = <800>;
+	};
+};
diff --git a/arch/arm/boot/dts/imx6dl-b105v2.dts b/arch/arm/boot/dts/imx6dl-b105v2.dts
new file mode 100644
index 000000000000..72a085348304
--- /dev/null
+++ b/arch/arm/boot/dts/imx6dl-b105v2.dts
@@ -0,0 +1,35 @@
+// SPDX-License-Identifier: GPL-2.0 or MIT
+//
+// Device Tree Source for General Electric B105v2
+//
+// Copyright 2018-2021 General Electric Company
+// Copyright 2018-2021 Collabora
+
+/dts-v1/;
+#include "imx6dl-b1x5v2.dtsi"
+
+/ {
+	model = "General Electric B105v2";
+	compatible = "ge,imx6dl-b105v2", "congatec,qmx6", "fsl,imx6dl";
+
+	panel {
+		compatible = "auo,g101evn010";
+		status = "okay";
+	};
+};
+
+&i2c3 {
+	touchscreen@41 {
+		reg = <0x41>;
+		compatible = "ilitek,ili251x";
+
+		pinctrl-names = "default";
+		pinctrl-0 =<&pinctrl_q7_gpio0>;
+		interrupt-parent = <&gpio5>;
+		interrupts = <2 IRQ_TYPE_EDGE_FALLING>;
+		reset-gpios = <&tca6424a 21 GPIO_ACTIVE_LOW>;
+
+		touchscreen-size-x = <1280>;
+		touchscreen-size-y = <800>;
+	};
+};
diff --git a/arch/arm/boot/dts/imx6dl-b125pv2.dts b/arch/arm/boot/dts/imx6dl-b125pv2.dts
new file mode 100644
index 000000000000..8fd6c8ed6750
--- /dev/null
+++ b/arch/arm/boot/dts/imx6dl-b125pv2.dts
@@ -0,0 +1,33 @@
+// SPDX-License-Identifier: GPL-2.0 or MIT
+//
+// Device Tree Source for General Electric B125Pv2
+//
+// Copyright 2018-2021 General Electric Company
+// Copyright 2018-2021 Collabora
+
+/dts-v1/;
+#include "imx6dl-b1x5pv2.dtsi"
+
+/ {
+	model = "General Electric B125Pv2";
+	compatible = "ge,imx6dl-b125pv2", "congatec,qmx6", "fsl,imx6dl";
+
+	panel {
+		compatible = "auo,g121ean01";
+		status = "okay";
+	};
+};
+
+&i2c3 {
+	touchscreen@2a {
+		reg = <0x2a>;
+		compatible = "eeti,exc80h60";
+
+		pinctrl-names = "default";
+		pinctrl-0 =<&pinctrl_q7_gpio0>;
+		interrupt-parent = <&gpio5>;
+		interrupts = <2 IRQ_TYPE_LEVEL_LOW>;
+
+		reset-gpios = <&tca6424a 21 GPIO_ACTIVE_HIGH>;
+	};
+};
diff --git a/arch/arm/boot/dts/imx6dl-b125v2.dts b/arch/arm/boot/dts/imx6dl-b125v2.dts
new file mode 100644
index 000000000000..eb26ffde9f72
--- /dev/null
+++ b/arch/arm/boot/dts/imx6dl-b125v2.dts
@@ -0,0 +1,33 @@
+// SPDX-License-Identifier: GPL-2.0 or MIT
+//
+// Device Tree Source for General Electric B125v2
+//
+// Copyright 2018-2021 General Electric Company
+// Copyright 2018-2021 Collabora
+
+/dts-v1/;
+#include "imx6dl-b1x5v2.dtsi"
+
+/ {
+	model = "General Electric B125v2";
+	compatible = "ge,imx6dl-b125v2", "congatec,qmx6", "fsl,imx6dl";
+
+	panel {
+		compatible = "auo,g121ean01";
+		status = "okay";
+	};
+};
+
+&i2c3 {
+	touchscreen@2a {
+		reg = <0x2a>;
+		compatible = "eeti,exc80h60";
+
+		pinctrl-names = "default";
+		pinctrl-0 =<&pinctrl_q7_gpio0>;
+		interrupt-parent = <&gpio5>;
+		interrupts = <2 IRQ_TYPE_LEVEL_LOW>;
+
+		reset-gpios = <&tca6424a 21 GPIO_ACTIVE_HIGH>;
+	};
+};
diff --git a/arch/arm/boot/dts/imx6dl-b155v2.dts b/arch/arm/boot/dts/imx6dl-b155v2.dts
new file mode 100644
index 000000000000..620cd6f9da82
--- /dev/null
+++ b/arch/arm/boot/dts/imx6dl-b155v2.dts
@@ -0,0 +1,36 @@
+// SPDX-License-Identifier: GPL-2.0 or MIT
+//
+// Device Tree Source for General Electric B155v2
+//
+// Copyright 2018-2021 General Electric Company
+// Copyright 2018-2021 Collabora
+
+/dts-v1/;
+#include "imx6dl-b1x5v2.dtsi"
+
+/ {
+	model = "General Electric B155v2";
+	compatible = "ge,imx6dl-b155v2", "congatec,qmx6", "fsl,imx6dl";
+
+	panel {
+		compatible = "auo,g156xtn01";
+		status = "okay";
+	};
+};
+
+&i2c3 {
+	touchscreen@2a {
+		reg = <0x2a>;
+		compatible = "eeti,exc80h84";
+
+		pinctrl-names = "default";
+		pinctrl-0 =<&pinctrl_q7_gpio0>;
+		interrupt-parent = <&gpio5>;
+		interrupts = <2 IRQ_TYPE_LEVEL_LOW>;
+
+		touchscreen-inverted-x;
+		touchscreen-inverted-y;
+
+		reset-gpios = <&tca6424a 21 GPIO_ACTIVE_HIGH>;
+	};
+};
diff --git a/arch/arm/boot/dts/imx6dl-b1x5pv2.dtsi b/arch/arm/boot/dts/imx6dl-b1x5pv2.dtsi
new file mode 100644
index 000000000000..1f9e66e1afc0
--- /dev/null
+++ b/arch/arm/boot/dts/imx6dl-b1x5pv2.dtsi
@@ -0,0 +1,434 @@
+// SPDX-License-Identifier: GPL-2.0 or MIT
+//
+// Device Tree Source for General Electric B1x5v2
+//
+// Copyright 2018-2021 General Electric Company
+// Copyright 2018-2021 Collabora
+
+#include <dt-bindings/input/input.h>
+#include "imx6dl-qmx6.dtsi"
+
+/ {
+	chosen {
+		stdout-path = &uart3;
+	};
+
+	/* Do not allow frequencies above 800MHz */
+	cpus {
+		cpu@0 {
+			operating-points = <
+				/* kHz    uV */
+				792000  1175000
+				396000  1150000
+			>;
+			fsl,soc-operating-points = <
+				/* ARM kHz	SOC-PU uV */
+				792000	1175000
+				396000	1175000
+			>;
+		};
+
+		cpu@1 {
+			operating-points = <
+				/* kHz    uV */
+				792000  1175000
+				396000  1150000
+			>;
+			fsl,soc-operating-points = <
+				/* ARM kHz	SOC-PU uV */
+				792000	1175000
+				396000	1175000
+			>;
+		};
+	};
+
+	reg_syspwr: regulator-12v {
+		compatible = "regulator-fixed";
+		regulator-name = "SYS_PWR";
+		regulator-min-microvolt = <12000000>;
+		regulator-max-microvolt = <12000000>;
+		regulator-always-on;
+	};
+
+	reg_5v_pmc: regulator-5v-pmc {
+		compatible = "regulator-fixed";
+		regulator-name = "5V PMC";
+		regulator-min-microvolt = <5000000>;
+		regulator-max-microvolt = <5000000>;
+		regulator-always-on;
+		vin-supply = <&reg_syspwr>;
+	};
+
+	reg_5v: regulator-5v {
+		compatible = "regulator-fixed";
+		regulator-name = "5V";
+		regulator-min-microvolt = <5000000>;
+		regulator-max-microvolt = <5000000>;
+		regulator-always-on;
+		vin-supply = <&reg_syspwr>;
+	};
+
+	reg_3v3: regulator-3v3 {
+		compatible = "regulator-fixed";
+		regulator-name = "3V3";
+		regulator-min-microvolt = <3300000>;
+		regulator-max-microvolt = <3300000>;
+		regulator-always-on;
+		vin-supply = <&reg_syspwr>;
+	};
+
+	reg_5v0_audio: regulator-5v0-audio {
+		compatible = "regulator-fixed";
+		regulator-name = "5V0_AUDIO";
+		regulator-min-microvolt = <5000000>;
+		regulator-max-microvolt = <5000000>;
+		vin-supply = <&reg_5v>;
+
+		gpio = <&tca6424a 16 GPIO_ACTIVE_HIGH>;
+		enable-active-high;
+
+		/*
+		 * This must be always-on for da7212, which has some not
+		 * properly documented dependencies for it's speaker supply
+		 * pin. The issue manifests as speaker volume being very low.
+		 */
+		regulator-always-on;
+	};
+
+
+	reg_3v3_audio: regulator-3v3-audio {
+		compatible = "regulator-fixed";
+		regulator-name = "3V3_AUDIO";
+		regulator-min-microvolt = <3300000>;
+		regulator-max-microvolt = <3300000>;
+		vin-supply = <&reg_3v3>;
+
+		pinctrl-0 = <&pinctrl_q7_hda_rst>;
+		pinctrl-names = "default";
+		gpio = <&gpio6 8 GPIO_ACTIVE_HIGH>;
+		enable-active-high;
+	};
+
+	reg_2v5_audio: regulator-2v5-audio {
+		compatible = "regulator-fixed";
+		regulator-name = "2V5_AUDIO";
+		regulator-min-microvolt = <2500000>;
+		regulator-max-microvolt = <2500000>;
+		regulator-always-on;
+		vin-supply = <&reg_3v3_audio>;
+
+	};
+
+	reg_wlan: regulator-wlan {
+		compatible = "regulator-fixed";
+		regulator-name = "WLAN";
+		regulator-min-microvolt = <3300000>;
+		regulator-max-microvolt = <3300000>;
+		vin-supply = <&reg_3v3>;
+
+		pinctrl-names = "default";
+		pinctrl-0 = <&pinctrl_q7_sdio_pwr>;
+		gpio = <&gpio4 30 GPIO_ACTIVE_HIGH>;
+
+		startup-delay-us = <70000>;
+		enable-active-high;
+	};
+
+	reg_bl: regulator-backlight {
+		compatible = "regulator-fixed";
+		regulator-name = "LED_VCC";
+		regulator-min-microvolt = <12000000>;
+		regulator-max-microvolt = <12000000>;
+		vin-supply = <&reg_syspwr>;
+
+		pinctrl-0 = <&pinctrl_q7_lcd_power>;
+		pinctrl-names = "default";
+		gpio = <&gpio1 7 GPIO_ACTIVE_HIGH>;
+		enable-active-high;
+	};
+
+	reg_lcd: regulator-lcd {
+		compatible = "regulator-fixed";
+		regulator-name = "LCD_5V";
+		regulator-min-microvolt = <5000000>;
+		regulator-max-microvolt = <5000000>;
+		vin-supply = <&reg_5v>;
+	};
+
+	usb_power: regulator-usb-power {
+		compatible = "regulator-fixed";
+		regulator-name = "USB POWER";
+		regulator-min-microvolt = <5000000>;
+		regulator-max-microvolt = <5000000>;
+		vin-supply = <&reg_5v>;
+	};
+
+	charger: battery-charger {
+		compatible = "gpio-charger"; /* ti,bq24172 */
+
+		charger-type = "mains";
+		gpios = <&tca6424a 3 GPIO_ACTIVE_LOW>;
+		charge-current-limit-gpios = <&tca6424a 11 GPIO_ACTIVE_HIGH>,
+					     <&tca6424a 12 GPIO_ACTIVE_HIGH>;
+		charge-current-limit-mapping = <1300000 0x0>,
+					       <700000 0x1>,
+					       <0 0x2>;
+
+		charge-status-gpios = <&tca6424a 6 GPIO_ACTIVE_HIGH>;
+	};
+
+	poweroff {
+		compatible = "gpio-poweroff";
+		pinctrl-names = "default";
+		pinctrl-0 = <&pinctrl_q7_spi_cs1>;
+		gpios = <&gpio4 25 GPIO_ACTIVE_LOW>;
+	};
+
+	power-button-key {
+		compatible = "gpio-keys";
+
+		pinctrl-names = "default";
+		pinctrl-0 = <&pinctrl_q7_slp_btn>;
+
+		power-button {
+			label = "power button";
+			gpios = <&gpio4 7 GPIO_ACTIVE_LOW>;
+			linux,code = <KEY_POWER>;
+		};
+	};
+
+	rotary-encoder-key {
+		compatible = "gpio-keys";
+
+		rotary-encoder-press {
+			label = "rotary-encoder press";
+			gpios = <&tca6424a 0 GPIO_ACTIVE_HIGH>;
+			linux,code = <KEY_ENTER>;
+			linux,can-disable;
+		};
+	};
+
+	rotary-encoder {
+		compatible = "rotary-encoder";
+		pinctrl-names = "default";
+		pinctrl-0 = <&pinctrl_q7_gpio2 &pinctrl_q7_gpio4>;
+		gpios = <&gpio4 26 GPIO_ACTIVE_LOW>, <&gpio1 0 GPIO_ACTIVE_LOW>;
+		rotary-encoder,relative-axis;
+		rotary-encoder,steps-per-period = <2>;
+		wakeup-source;
+	};
+
+	leds {
+		compatible = "gpio-leds";
+		pinctrl-names = "default";
+		pinctrl-0 = <&pinctrl_q7_gpio1 &pinctrl_q7_gpio3 &pinctrl_q7_gpio5>;
+
+		alarm1 {
+			label = "alarm:red";
+			gpios = <&gpio1 8 GPIO_ACTIVE_HIGH>;
+		};
+
+		alarm2 {
+			label = "alarm:yellow";
+			gpios = <&gpio4 27 GPIO_ACTIVE_HIGH>;
+		};
+
+		alarm3 {
+			label = "alarm:blue";
+			gpios = <&gpio4 15 GPIO_ACTIVE_HIGH>;
+		};
+	};
+
+	backlight: backlight {
+		compatible = "pwm-backlight";
+		pinctrl-names = "default";
+		pinctrl-0 = <&pinctrl_q7_backlight_enable>;
+		power-supply = <&reg_bl>;
+		pwms = <&pwm4 0 5000000 0>;
+		brightness-levels = <0 255>;
+		num-interpolated-steps = <255>;
+		default-brightness-level = <179>;
+		enable-gpios = <&gpio1 9 GPIO_ACTIVE_HIGH>;
+		status = "okay";
+	};
+
+	panel {
+		backlight = <&backlight>;
+		power-supply = <&reg_lcd>;
+
+		port {
+			panel_in: endpoint {
+				remote-endpoint = <&lvds0_out>;
+			};
+		};
+	};
+
+	sound {
+		compatible = "simple-audio-card";
+		simple-audio-card,name = "audio-card";
+		simple-audio-card,format = "i2s";
+		simple-audio-card,bitclock-master = <&dailink_master>;
+		simple-audio-card,frame-master = <&dailink_master>;
+
+		simple-audio-card,widgets = "Speaker", "Ext Spk";
+		simple-audio-card,audio-routing = "Ext Spk", "LINE";
+
+		simple-audio-card,cpu {
+			sound-dai = <&ssi1>;
+		};
+
+		dailink_master: simple-audio-card,codec {
+			sound-dai = <&codec>;
+		};
+	};
+
+	clk_ext_audio_codec: clock-codec {
+		compatible = "fixed-clock";
+		#clock-cells = <0>;
+		clock-frequency = <12288000>;
+	};
+};
+
+&i2c1 {
+	battery: battery@b {
+		compatible = "ti,bq20z65", "sbs,sbs-battery";
+		reg = <0x0b>;
+
+		sbs,battery-detect-gpios = <&tca6424a 5 GPIO_ACTIVE_LOW>;
+		sbs,i2c-retry-count = <5>;
+
+		power-supplies = <&charger>;
+	};
+
+	codec: audio-codec@1a {
+		compatible = "dlg,da7212";
+		reg = <0x1a>;
+		#sound-dai-cells = <0>;
+		VDDA-supply = <&reg_2v5_audio>;
+		VDDSP-supply = <&reg_5v0_audio>;
+		VDDMIC-supply = <&reg_3v3_audio>;
+		VDDIO-supply = <&reg_3v3_audio>;
+		clocks = <&clk_ext_audio_codec>;
+		clock-names = "mclk";
+	};
+};
+
+&i2c5 {
+	tmp75: temperature-sensor@48 {
+		compatible = "ti,tmp75";
+		reg = <0x48>;
+		vs-supply = <&reg_3v3>;
+		interrupt-parent = <&tca6424a>;
+		interrupts = <2 IRQ_TYPE_EDGE_FALLING>;
+	};
+
+	tca6424a: gpio-controller@22 {
+		compatible = "ti,tca6424";
+		reg = <0x22>;
+		gpio-controller;
+		#gpio-cells = <2>;
+		vcc-supply = <&reg_3v3>;
+
+		interrupt-parent = <&gpio7>;
+		interrupts = <11 IRQ_TYPE_LEVEL_LOW>;
+		pinctrl-names = "default";
+		pinctrl-0 = <&pinctrl_q7_gpio6>;
+		interrupt-controller;
+		#interrupt-cells = <2>;
+
+		gpio-line-names = "GPIO_ROTOR#", "ACM_IO_INT", "TMP_SENSOR_IRQ", "AC_IN",
+				  "TF_S", "BATT_T", "LED_INC_CHAR", "ACM1_OCF",
+				  "ACM2_OCF", "ACM_IO_RST", "USB1_POWER_EN", "EGPIO_CC_CTL0",
+				  "EGPIO_CC_CTL1", "12V_OEMNBP_EN", "CP2105_RST", "",
+				  "SPEAKER_PA_EN", "ARM7_UPI_RESET", "ARM7_PWR_RST", "NURSE_CALL",
+				  "MARKER_EN", "EGPIO_TOUCH_RST", "PRESSURE_INT1", "PRESSURE_INT2";
+
+	};
+};
+
+&fec {
+	status = "okay";
+};
+
+&hdmi {
+	status = "okay";
+};
+
+&audmux {
+	status = "okay";
+};
+
+&ssi1 {
+	fsl,mode = "i2s-slave";
+	status = "okay";
+};
+
+&usbotg {
+	vbus-supply = <&usb_power>;
+	disable-over-current;
+	dr_mode = "host";
+	status = "okay";
+
+	/*
+	 * TPS2051BDGN fault-gpio is connected to Q7[86] USB_0_1_OC_N.
+	 * On QMX6 this is not connceted to the i.MX6, but to the USB Hub
+	 * from &usbh1. This means, that we cannot easily detect and handle
+	 * over-current events. Fortunately the regulator limits the current
+	 * automatically, so the hardware is still protected.
+	 */
+};
+
+&pwm4 {
+	status = "okay";
+};
+
+&ldb {
+	status = "okay";
+
+	lvds0: lvds-channel@0 {
+		status = "okay";
+		fsl,data-mapping = "spwg";
+		fsl,data-width = <24>;
+
+		port@4 {
+			reg = <4>;
+			lvds0_out: endpoint {
+				remote-endpoint = <&panel_in>;
+			};
+		};
+	};
+};
+
+&usdhc4 {
+	/* WiFi module */
+	status = "okay";
+
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_usdhc4>;
+
+	bus-width = <4>;
+	no-1-8-v;
+	non-removable;
+	wakeup-source;
+	keep-power-in-suspend;
+	cap-power-off-card;
+	max-frequency = <25000000>;
+	vmmc-supply = <&reg_wlan>;
+
+	#address-cells = <1>;
+	#size-cells = <0>;
+
+	wlcore: wlcore@2 {
+		compatible = "ti,wl1837";
+		reg = <2>;
+
+		pinctrl-names = "default";
+		pinctrl-0 = <&pinctrl_q7_gpio7>;
+
+		interrupt-parent = <&gpio4>;
+		interrupts = <14 IRQ_TYPE_LEVEL_HIGH>;
+
+		tcxo-clock-frequency = <26000000>;
+	};
+
+};
diff --git a/arch/arm/boot/dts/imx6dl-b1x5v2.dtsi b/arch/arm/boot/dts/imx6dl-b1x5v2.dtsi
new file mode 100644
index 000000000000..b4c6fbd802fb
--- /dev/null
+++ b/arch/arm/boot/dts/imx6dl-b1x5v2.dtsi
@@ -0,0 +1,61 @@
+// SPDX-License-Identifier: GPL-2.0 or MIT
+//
+// Device Tree Source for General Electric B1x5v2
+//
+// Copyright 2018-2021 General Electric Company
+// Copyright 2018-2021 Collabora
+
+#include <dt-bindings/input/input.h>
+#include "imx6dl-b1x5pv2.dtsi"
+
+/ {
+	reg_3v3_acm: regulator-3v3-acm {
+		compatible = "regulator-fixed";
+		regulator-name = "3V3 ACM";
+		regulator-min-microvolt = <3300000>;
+		regulator-max-microvolt = <3300000>;
+		regulator-always-on;
+		vin-supply = <&reg_3v3>;
+	};
+};
+
+&i2c1 {
+	tca6416: gpio-controller@21 {
+		compatible = "ti,tca6416";
+		reg = <0x21>;
+		gpio-controller;
+		#gpio-cells = <2>;
+		vcc-supply = <&reg_3v3_acm>;
+
+		/*
+		 * TCA6424 cannot handle low type interrupts at the moment and
+		 * it cannot be added without quite a few hacks. Since this
+		 * controller does not have any input type GPIOs, pretend that
+		 * the interrupt pin is unconnected.
+		 */
+		//interrupt-parent = <&tca6424a>;
+		//interrupts = <1 IRQ_TYPE_LEVEL_LOW>;
+		//interrupt-controller;
+		//#interrupt-cells = <2>;
+
+		reset-gpios = <&tca6424a 9 GPIO_ACTIVE_LOW>;
+
+		gpio-line-names = "ACM1_EN", "ACM1_CL0", "ACM1_CL1", "ACM1_CL2",
+				  "", "ACM2_EN", "ACM2_CL0", "ACM2_CL1",
+				  "ACM2_CL2", "", "", "",
+				  "", "", "", "";
+	};
+};
+
+&i2c5 {
+	mpl3115a2: pressure-sensor@60 {
+		compatible = "fsl,mpl3115";
+		reg = <0x60>;
+
+		vcc-supply = <&reg_3v3_acm>;
+
+		/* The MPL3115 binding does not yet support interrupts */
+		//interrupt-parent = <&tca6424a>;
+		//interrupts = <22 IRQ_TYPE_EDGE_RISING 23 IRQ_TYPE_EDGE_RISING>;
+	};
+};
diff --git a/arch/arm/boot/dts/imx6dl-qmx6.dtsi b/arch/arm/boot/dts/imx6dl-qmx6.dtsi
new file mode 100644
index 000000000000..dbcca0b02792
--- /dev/null
+++ b/arch/arm/boot/dts/imx6dl-qmx6.dtsi
@@ -0,0 +1,623 @@
+// SPDX-License-Identifier: GPL-2.0 or MIT
+//
+// Device Tree Source for i.MX6DL based congatec QMX6
+//
+// Copyright 2018-2021 General Electric Company
+// Copyright 2018-2021 Collabora
+// Copyright 2016 congatec AG
+
+#include "imx6dl.dtsi"
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/sound/fsl-imx-audmux.h>
+
+/ {
+	memory@10000000 {
+		reg = <0x10000000 0x40000000>;
+	};
+
+	reg_3p3v: 3p3v {
+		compatible = "regulator-fixed";
+		regulator-name = "3P3V";
+		regulator-min-microvolt = <3300000>;
+		regulator-max-microvolt = <3300000>;
+		regulator-always-on;
+	};
+
+	i2cmux {
+		compatible = "i2c-mux-gpio";
+		#address-cells = <1>;
+		#size-cells = <0>;
+		mux-gpios = <&gpio6 9 GPIO_ACTIVE_HIGH>;
+		i2c-parent = <&i2c2>;
+
+		i2c5: i2c@0 {
+			reg = <0>;
+			#address-cells = <1>;
+			#size-cells = <0>;
+		};
+
+		i2c6: i2c@1 {
+			reg = <1>;
+			#address-cells = <1>;
+			#size-cells = <0>;
+		};
+	};
+};
+
+&ecspi1 {
+	fsl,spi-num-chipselects = <1>;
+	cs-gpios = <&gpio3 19 0>;
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_ecspi1>;
+	status = "okay";
+
+	flash@0 {
+		#address-cells = <1>;
+		#size-cells = <1>;
+		compatible = "sst,sst25vf032b", "jedec,spi-nor";
+		spi-max-frequency = <20000000>;
+		reg = <0>;
+
+		partition@0 {
+			label = "bootloader";
+			reg = <0x0000000 0x100000>;
+		};
+
+		partition@100000 {
+			label = "user";
+			reg = <0x0100000 0x2fc000>;
+		};
+
+		partition@3fc000 {
+			label = "reserved";
+			reg = <0x03fc000 0x4000>;
+			read-only;
+		};
+	};
+};
+
+&fec {
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_enet &pinctrl_phy_reset>;
+	phy-mode = "rgmii-id";
+	phy-reset-gpios = <&gpio3 23 GPIO_ACTIVE_LOW>;
+	fsl,magic-packet;
+	phy-handle = <&phy0>;
+
+	mdio {
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		phy0: ethernet-phy@6 {
+			reg = <6>;
+			qca,clk-out-frequency = <125000000>;
+		};
+	};
+};
+
+&i2c6 {
+	pmic@8 {
+		compatible = "fsl,pfuze100";
+		reg = <0x08>;
+
+		regulators {
+			sw1a_reg: sw1ab {
+				regulator-min-microvolt = <300000>;
+				regulator-max-microvolt = <1875000>;
+				regulator-boot-on;
+				regulator-always-on;
+				regulator-ramp-delay = <6250>;
+			};
+
+			sw1c_reg: sw1c {
+				regulator-min-microvolt = <300000>;
+				regulator-max-microvolt = <1875000>;
+				regulator-boot-on;
+				regulator-always-on;
+				regulator-ramp-delay = <6250>;
+			};
+
+			sw2_reg: sw2 {
+				regulator-min-microvolt = <800000>;
+				regulator-max-microvolt = <3300000>;
+				regulator-boot-on;
+				regulator-always-on;
+			};
+
+			sw3a_reg: sw3a {
+				regulator-min-microvolt = <400000>;
+				regulator-max-microvolt = <1975000>;
+				regulator-boot-on;
+				regulator-always-on;
+			};
+
+			sw3b_reg: sw3b {
+				regulator-min-microvolt = <400000>;
+				regulator-max-microvolt = <1975000>;
+				regulator-boot-on;
+				regulator-always-on;
+			};
+
+			sw4_reg: sw4 {
+				regulator-min-microvolt = <675000>;
+				regulator-max-microvolt = <3300000>;
+				regulator-boot-on;
+				regulator-always-on;
+			};
+
+			swbst_reg: swbst {
+				regulator-min-microvolt = <5000000>;
+				regulator-max-microvolt = <5150000>;
+			};
+
+			snvs_reg: vsnvs {
+				regulator-min-microvolt = <1000000>;
+				regulator-max-microvolt = <3000000>;
+				regulator-boot-on;
+				regulator-always-on;
+			};
+
+			vref_reg: vrefddr {
+				regulator-boot-on;
+				regulator-always-on;
+			};
+
+			/*
+			 * keep VGEN3, VGEN4 and VGEN5 enabled in order to
+			 * maintain backward compatibility with hw-rev. A.0
+			 */
+			vgen3_reg: vgen3 {
+				regulator-min-microvolt = <1800000>;
+				regulator-max-microvolt = <3300000>;
+				regulator-always-on;
+			};
+
+			vgen4_reg: vgen4 {
+				regulator-min-microvolt = <2500000>;
+				regulator-max-microvolt = <2500000>;
+				regulator-always-on;
+			};
+
+			vgen5_reg: vgen5 {
+				regulator-min-microvolt = <1800000>;
+				regulator-max-microvolt = <3300000>;
+				regulator-always-on;
+			};
+
+			/* supply voltage for eMMC */
+			vgen6_reg: vgen6 {
+				regulator-min-microvolt = <1800000>;
+				regulator-max-microvolt = <1800000>;
+				regulator-boot-on;
+				regulator-always-on;
+			};
+		};
+	};
+};
+
+&pcie {
+	reset-gpio = <&gpio1 20 0>;
+};
+
+&audmux {
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_audmux>;
+
+	audmux_ssi1 {
+		fsl,audmux-port = <MX51_AUDMUX_PORT1_SSI0>;
+		fsl,port-config = <
+			(IMX_AUDMUX_V2_PTCR_TFSDIR |
+			IMX_AUDMUX_V2_PTCR_TFSEL(MX51_AUDMUX_PORT6) |
+			IMX_AUDMUX_V2_PTCR_TCLKDIR |
+			IMX_AUDMUX_V2_PTCR_TCSEL(MX51_AUDMUX_PORT6) |
+			IMX_AUDMUX_V2_PTCR_SYN)
+			IMX_AUDMUX_V2_PDCR_RXDSEL(MX51_AUDMUX_PORT6)
+		>;
+	};
+
+	audmux_aud6 {
+		fsl,audmux-port = <MX51_AUDMUX_PORT6>;
+		fsl,port-config = <
+			IMX_AUDMUX_V2_PTCR_SYN
+			IMX_AUDMUX_V2_PDCR_RXDSEL(MX51_AUDMUX_PORT1_SSI0)
+		>;
+	};
+};
+
+&clks {
+	assigned-clocks = <&clks IMX6QDL_CLK_LDB_DI0_SEL>,
+			  <&clks IMX6QDL_CLK_LDB_DI1_SEL>;
+	assigned-clock-parents = <&clks IMX6QDL_CLK_PLL2_PFD0_352M>,
+				 <&clks IMX6QDL_CLK_PLL2_PFD0_352M>;
+};
+
+&i2c1 {
+	clock-frequency = <100000>;
+	pinctrl-names = "default", "gpio";
+	pinctrl-0 = <&pinctrl_i2c1>;
+	pinctrl-1 = <&pinctrl_i2c1_gpio>;
+	scl-gpios = <&gpio3 21 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
+	sda-gpios = <&gpio3 28 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
+	status = "okay";
+};
+
+&i2c2 {
+	clock-frequency = <100000>;
+	pinctrl-names = "default", "gpio";
+	pinctrl-0 = <&pinctrl_i2c2>;
+	pinctrl-1 = <&pinctrl_i2c2_gpio>;
+	scl-gpios = <&gpio4 12 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
+	sda-gpios = <&gpio4 13 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
+	status = "okay";
+};
+
+&i2c3 {
+	clock-frequency = <100000>;
+	pinctrl-names = "default", "gpio";
+	pinctrl-0 = <&pinctrl_i2c3>;
+	pinctrl-1 = <&pinctrl_i2c3_gpio>;
+	scl-gpios = <&gpio1 3 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
+	sda-gpios = <&gpio1 6 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
+
+	status = "okay";
+
+	rtc: m41t62@68 {
+		compatible = "st,m41t62";
+		reg = <0x68>;
+		#clocks-cells = <0>;
+		/*
+		 * RTC clock provides i.MX6 CKIL and must not be disabled.
+		 * Properly describing this dependency in device-tree will
+		 * result in a chicken-and-egg situation, since operating
+		 * system cannot control the I2C RTC without CKIL. This
+		 * hardware setup only works because the RTC enables the
+		 * SQW with correct 32.768 kHz by default.
+		 */
+		protected-clocks;
+	};
+};
+
+&pwm4 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_pwm4>;
+};
+
+&reg_arm {
+	vin-supply = <&sw1a_reg>;
+};
+
+&reg_pu {
+	vin-supply = <&sw1c_reg>;
+};
+
+&reg_soc {
+	vin-supply = <&sw1c_reg>;
+};
+
+&snvs_poweroff {
+	status = "okay";
+};
+
+&uart2 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_uart2>;
+	status = "okay";
+};
+
+&uart3 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_uart3>;
+	status = "okay";
+};
+
+&usdhc2 {
+	/* MicroSD card slot */
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_usdhc2>;
+	cd-gpios = <&gpio1 4 GPIO_ACTIVE_LOW>;
+	no-1-8-v;
+	keep-power-in-suspend;
+	wakeup-source;
+	vmmc-supply = <&reg_3p3v>;
+	status = "okay";
+};
+
+&usdhc3 {
+	/* eMMC module */
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_usdhc3>;
+	non-removable;
+	bus-width = <8>;
+	no-1-8-v;
+	keep-power-in-suspend;
+	wakeup-source;
+	vmmc-supply = <&reg_3p3v>;
+	status = "okay";
+};
+
+&usbh1 {
+	/* Connected to USB-Hub SMSC USB2514, provides P0, P2, P3, P4 on Qseven connector */
+	vbus-supply = <&reg_5v>;
+	status = "okay";
+};
+
+&usbotg {
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_usbotg>;
+};
+
+&wdog1 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_wdog>;
+	fsl,ext-reset-output;
+};
+
+&iomuxc {
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_hog>;
+
+	qmx6mux: imx6qdl-qmx6 {
+	};
+};
+
+&qmx6mux {
+	pinctrl_hog: hoggrp {
+		fsl,pins = <
+			MX6QDL_PAD_GPIO_2__GPIO1_IO02		0x80000000 /* PCIE_WAKE_B */
+			MX6QDL_PAD_NANDF_WP_B__GPIO6_IO09	0x80000000 /* I2C multiplexer */
+			MX6QDL_PAD_NANDF_D6__GPIO2_IO06		0x80000000 /* SD4_CD# */
+			MX6QDL_PAD_NANDF_D7__GPIO2_IO07		0x80000000 /* SD4_WP */
+			MX6QDL_PAD_CSI0_MCLK__CCM_CLKO1		0x80000000 /* Camera MCLK */
+		>;
+	};
+
+	/* Watchdog output signal */
+	pinctrl_wdog: wdoggrp {
+		fsl,pins = <
+			MX6QDL_PAD_DISP0_DAT8__WDOG1_B		0x1b0b0
+		>;
+	};
+
+	pinctrl_q7_hda_rst: hdarstgrp {
+		fsl,pins = <
+			MX6QDL_PAD_NANDF_ALE__GPIO6_IO08	0x1b0b0 /* Q7[61] HDA_RST_N */
+		>;
+	};
+
+	pinctrl_q7_backlight_enable: blengrp {
+		fsl,pins = <
+			MX6QDL_PAD_GPIO_9__GPIO1_IO09		0x1b0b0 /* Q7[112] LVDS_BLEN */
+		>;
+	};
+
+	pinctrl_audmux: audmuxgrp {
+		fsl,pins = <
+			MX6QDL_PAD_DI0_PIN2__AUD6_TXD		0x110b0 /* Q7[67] HDA_SDO */
+			MX6QDL_PAD_DI0_PIN3__AUD6_TXFS		0x130b0 /* Q7[59] HDA_SYNC */
+			MX6QDL_PAD_DI0_PIN4__AUD6_RXD		0x130b0 /* Q7[65] HDA_SDI */
+			MX6QDL_PAD_DI0_PIN15__AUD6_TXC		0x130b0 /* Q7[63] HDA_BITCLK */
+		>;
+	};
+
+	/* SPI bus does not leave System on Module */
+	pinctrl_ecspi1: ecspi1grp {
+		fsl,pins = <
+			MX6QDL_PAD_EIM_D16__ECSPI1_SCLK		0x100b1
+			MX6QDL_PAD_EIM_D17__ECSPI1_MISO		0x100b1
+			MX6QDL_PAD_EIM_D18__ECSPI1_MOSI		0x100b1
+			MX6QDL_PAD_EIM_D19__GPIO3_IO19		0x1b0b0
+		>;
+	};
+
+	/* PHY is on System on Module, Q7[3-15] have Ethernet lines */
+	pinctrl_enet: enetgrp {
+		fsl,pins = <
+			MX6QDL_PAD_ENET_MDIO__ENET_MDIO		0x1b0b0
+			MX6QDL_PAD_ENET_MDC__ENET_MDC		0x1b0b0
+			MX6QDL_PAD_RGMII_TXC__RGMII_TXC		0x1b030
+			MX6QDL_PAD_RGMII_TD0__RGMII_TD0		0x1b030
+			MX6QDL_PAD_RGMII_TD1__RGMII_TD1		0x1b030
+			MX6QDL_PAD_RGMII_TD2__RGMII_TD2		0x1b030
+			MX6QDL_PAD_RGMII_TD3__RGMII_TD3		0x1b030
+			MX6QDL_PAD_RGMII_TX_CTL__RGMII_TX_CTL	0x1b030
+			MX6QDL_PAD_ENET_REF_CLK__ENET_TX_CLK	0x1b0b0
+			MX6QDL_PAD_RGMII_RXC__RGMII_RXC		0x1b030
+			MX6QDL_PAD_RGMII_RD0__RGMII_RD0		0x1b030
+			MX6QDL_PAD_RGMII_RD1__RGMII_RD1		0x1b030
+			MX6QDL_PAD_RGMII_RD2__RGMII_RD2		0x1b030
+			MX6QDL_PAD_RGMII_RD3__RGMII_RD3		0x1b030
+			MX6QDL_PAD_RGMII_RX_CTL__RGMII_RX_CTL	0x1b030
+			MX6QDL_PAD_ENET_TX_EN__ENET_TX_EN	0x1b0b0
+		>;
+	};
+
+	/* RGMII Phy Reset */
+	pinctrl_phy_reset: phyrstgrp {
+		fsl,pins = <
+			MX6QDL_PAD_EIM_D23__GPIO3_IO23		0x1b0b0
+		>;
+	};
+
+	pinctrl_i2c1: i2c1grp {
+		fsl,pins = <
+			MX6QDL_PAD_EIM_D21__I2C1_SCL		0x4001b8b1 /* Q7[66] I2C_CLK */
+			MX6QDL_PAD_EIM_D28__I2C1_SDA		0x4001b8b1 /* Q7[68] I2C_DAT */
+		>;
+	};
+
+	pinctrl_i2c1_gpio: i2c1gpiogrp {
+		fsl,pins = <
+			MX6QDL_PAD_EIM_D21__GPIO3_IO21		0x1b0b0 /* Q7[66] I2C_CLK */
+			MX6QDL_PAD_EIM_D28__GPIO3_IO28		0x1b0b0 /* Q7[68] I2C_DAT */
+		>;
+	};
+
+
+	pinctrl_i2c2: i2c2grp {
+		fsl,pins = <
+			MX6QDL_PAD_KEY_COL3__I2C2_SCL		0x4001b8b1 /* Q7[152] SDVO_CTRL_CLK */
+			MX6QDL_PAD_KEY_ROW3__I2C2_SDA		0x4001b8b1 /* Q7[150] SDVO_CTRL_DAT */
+		>;
+	};
+
+	pinctrl_i2c2_gpio: i2c2gpiogrp {
+		fsl,pins = <
+			MX6QDL_PAD_KEY_COL3__GPIO4_IO12		0x1b0b0 /* Q7[152] SDVO_CTRL_CLK */
+			MX6QDL_PAD_KEY_ROW3__GPIO4_IO13		0x1b0b0 /* Q7[150] SDVO_CTRL_DAT */
+		>;
+	};
+
+	pinctrl_i2c3: i2c3grp {
+		fsl,pins = <
+			MX6QDL_PAD_GPIO_3__I2C3_SCL		0x4001b8b1 /* Q7[60] SMB_CLK */
+			MX6QDL_PAD_GPIO_6__I2C3_SDA		0x4001b8b1 /* Q7[62] SMB_DAT */
+		>;
+	};
+
+	pinctrl_i2c3_gpio: i2c3gpiogrp {
+		fsl,pins = <
+			MX6QDL_PAD_GPIO_3__GPIO1_IO03		0x1b0b0 /* Q7[60] SMB_CLK */
+			MX6QDL_PAD_GPIO_6__GPIO1_IO06		0x1b0b0 /* Q7[62] SMB_DAT */
+		>;
+	};
+
+	pinctrl_pwm4: pwm4grp {
+		fsl,pins = <
+			MX6QDL_PAD_SD1_CMD__PWM4_OUT		0x1b0b1 /* Q7[123] LVDS_BLT_CTRL */
+		>;
+	};
+
+	/* Debug connector on Q7 module */
+	pinctrl_uart2: uart2grp {
+		fsl,pins = <
+			MX6QDL_PAD_EIM_D26__UART2_TX_DATA	0x1b0b1
+			MX6QDL_PAD_EIM_D27__UART2_RX_DATA	0x1b0b1
+		>;
+	};
+
+	pinctrl_uart3: uart3grp {
+		fsl,pins = <
+			MX6QDL_PAD_EIM_D25__UART3_RX_DATA	0x1b0b1 /* Q7[177] UART0_RX */
+			MX6QDL_PAD_EIM_D24__UART3_TX_DATA	0x1b0b1 /* Q7[171] UART0_TX */
+		>;
+	};
+
+	/* µSD card slot on Q7 module */
+	pinctrl_usdhc2: usdhc2grp {
+		fsl,pins = <
+			MX6QDL_PAD_SD2_CMD__SD2_CMD		0x17059
+			MX6QDL_PAD_SD2_CLK__SD2_CLK		0x10059
+			MX6QDL_PAD_SD2_DAT0__SD2_DATA0		0x17059
+			MX6QDL_PAD_SD2_DAT1__SD2_DATA1		0x17059
+			MX6QDL_PAD_SD2_DAT2__SD2_DATA2		0x17059
+			MX6QDL_PAD_SD2_DAT3__SD2_DATA3		0x17059
+			MX6QDL_PAD_GPIO_4__GPIO1_IO04		0x1b0b0 /* SD2_CD */
+		>;
+	};
+
+	/* eMMC module on Q7 module */
+	pinctrl_usdhc3: usdhc3grp {
+		fsl,pins = <
+			MX6QDL_PAD_SD3_CMD__SD3_CMD		0x17059
+			MX6QDL_PAD_SD3_CLK__SD3_CLK		0x10059
+			MX6QDL_PAD_SD3_DAT0__SD3_DATA0		0x17059
+			MX6QDL_PAD_SD3_DAT1__SD3_DATA1		0x17059
+			MX6QDL_PAD_SD3_DAT2__SD3_DATA2		0x17059
+			MX6QDL_PAD_SD3_DAT3__SD3_DATA3		0x17059
+			MX6QDL_PAD_SD3_DAT4__SD3_DATA4		0x17059
+			MX6QDL_PAD_SD3_DAT5__SD3_DATA5		0x17059
+			MX6QDL_PAD_SD3_DAT6__SD3_DATA6		0x17059
+			MX6QDL_PAD_SD3_DAT7__SD3_DATA7		0x17059
+		>;
+	};
+
+
+	pinctrl_usdhc4: usdhc4grp {
+		fsl,pins = <
+			MX6QDL_PAD_SD4_CMD__SD4_CMD		0x17059 /* Q7[45] SDIO_CMD */
+			MX6QDL_PAD_SD4_CLK__SD4_CLK		0x17059 /* Q7[42] SDIO_CLK */
+			MX6QDL_PAD_SD4_DAT1__SD4_DATA1		0x17059 /* Q7[48] SDIO_DAT1 */
+			MX6QDL_PAD_SD4_DAT0__SD4_DATA0		0x17059 /* Q7[49] SDIO_DAT0 */
+			MX6QDL_PAD_SD4_DAT3__SD4_DATA3		0x17059 /* Q7[50] SDIO_DAT3 */
+			MX6QDL_PAD_SD4_DAT2__SD4_DATA2		0x17059 /* Q7[51] SDIO_DAT2 */
+		>;
+	};
+
+	pinctrl_q7_slp_btn: q7slpbtngrp {
+		fsl,pins = <
+			MX6QDL_PAD_KEY_ROW0__GPIO4_IO07		0x1b0b0 /* Q7[21] SLP_BTN# */
+		>;
+	};
+
+	pinctrl_q7_sdio_pwr: q7sdiopwrgrp {
+		fsl,pins = <
+			MX6QDL_PAD_DISP0_DAT9__GPIO4_IO30	0x1b0b0 /* Q7[47] SDIO_PWR# */
+		>;
+	};
+
+	pinctrl_q7_gpio0: q7gpio0grp {
+		fsl,pins = <
+			MX6QDL_PAD_EIM_A25__GPIO5_IO02		0x1b0b0 /* Q7[185] GPIO0 */
+		>;
+	};
+
+	pinctrl_q7_gpio1: q7gpio1grp {
+		fsl,pins = <
+			MX6QDL_PAD_GPIO_8__GPIO1_IO08		0x1b0b0 /* Q7[186] GPIO1 */
+		>;
+	};
+
+	pinctrl_q7_gpio2: q7gpio2grp {
+		fsl,pins = <
+			MX6QDL_PAD_DISP0_DAT5__GPIO4_IO26	0x1b0b0 /* Q7[187] GPIO2 */
+		>;
+	};
+
+	pinctrl_q7_gpio3: q7gpio3grp {
+		fsl,pins = <
+			MX6QDL_PAD_DISP0_DAT6__GPIO4_IO27	0x1b0b0 /* Q7[188] GPIO3 */
+		>;
+	};
+
+	pinctrl_q7_gpio4: q7gpio4grp {
+		fsl,pins = <
+			MX6QDL_PAD_GPIO_0__GPIO1_IO00		0x1b0b0 /* Q7[189] GPIO4 */
+		>;
+	};
+
+	pinctrl_q7_gpio5: q7gpio5grp {
+		fsl,pins = <
+			MX6QDL_PAD_KEY_ROW4__GPIO4_IO15		0x1b0b0 /* Q7[190] GPIO5 */
+		>;
+	};
+
+	pinctrl_q7_gpio6: q7gpio6grp {
+		fsl,pins = <
+			MX6QDL_PAD_GPIO_16__GPIO7_IO11		0x1b0b0 /* Q7[191] GPIO6 */
+		>;
+	};
+
+	pinctrl_q7_gpio7: q7gpio7grp {
+		fsl,pins = <
+			MX6QDL_PAD_KEY_COL4__GPIO4_IO14		0x1b0b0 /* Q7[192] GPIO7 */
+		>;
+	};
+
+	pinctrl_usbotg: usbotggrp {
+		fsl,pins = <
+			MX6QDL_PAD_GPIO_1__USB_OTG_ID		0x17059 /* Q7[92] USB_ID */
+		>;
+	};
+
+	pinctrl_q7_lcd_power: lcdpwrgrp {
+		fsl,pins = <
+			MX6QDL_PAD_GPIO_7__GPIO1_IO07		0x1b0b0 /* Q7[111] LVDS_PPEN */
+		>;
+	};
+
+	pinctrl_q7_spi_cs1: spics1grp {
+		fsl,pins = <
+			MX6QDL_PAD_DISP0_DAT4__GPIO4_IO25	0x1b0b0 /* Q7[202] SPI_CS1# */
+		>;
+	};
+};
-- 
2.30.0

Re: [PATCHv1 1/6] rtc: m41t80: add support for protected clock

[Alexandre Belloni]

On 22/02/2021 18:12:42+0100, Sebastian Reichel wrote:
> Congatec's QMX6 system on module (SoM) uses a m41t62 as RTC. The
> modules SQW clock output defaults to 32768 Hz. This behaviour is
> used to provide the i.MX6 CKIL clock. Once the RTC driver is probed,
> the clock is disabled and all i.MX6 functionality depending on
> the 32 KHz clock has undefined behaviour. On systems using hardware
> watchdog it seems to likely trigger a lot earlier than configured.
> 
> The proper solution would be to describe this dependency in DT,
> but that will result in a deadlock. The kernel will see, that
> i.MX6 system clock needs the RTC clock and do probe deferral.
> But the i.MX6 I2C module never becomes usable without the i.MX6
> CKIL clock and thus the RTC's clock will not be probed. So from
> the kernel's perspective this is a chicken-and-egg problem.
> 

Reading the previous paragraph, I was going to suggest describing the
dependency and wondering whether this would cause a circular dependency.
I guess this will keep being an issue for clocks on an I2C or SPI bus...

> Technically everything is fine by not touching anything, since
> the RTC clock correctly enables the clock on reset (i.e. on
> battery backup power loss) and also the bootloader enables it
> in case a kernel without this support has been booted.
> 
> The 'protected-clocks' property is already in use for some clocks
> that may not be touched because of firmware limitations and is
> described in Documentation/devicetree/bindings/clock/clock-bindings.txt.
> 
> Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Acked-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

> ---
>  Documentation/devicetree/bindings/rtc/rtc-m41t80.txt | 1 +
>  drivers/rtc/rtc-m41t80.c                             | 3 +++
>  2 files changed, 4 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/rtc/rtc-m41t80.txt b/Documentation/devicetree/bindings/rtc/rtc-m41t80.txt
> index c746cb221210..ea4bbf5c4282 100644
> --- a/Documentation/devicetree/bindings/rtc/rtc-m41t80.txt
> +++ b/Documentation/devicetree/bindings/rtc/rtc-m41t80.txt
> @@ -19,6 +19,7 @@ Optional properties:
>  - interrupts: rtc alarm interrupt.
>  - clock-output-names: From common clock binding to override the default output
>                        clock name
> +- protected-clocks: Bool, if set operating system should not handle clock.
>  - wakeup-source: Enables wake up of host system on alarm
>  
>  Example:
> diff --git a/drivers/rtc/rtc-m41t80.c b/drivers/rtc/rtc-m41t80.c
> index 160dcf68e64e..3296583853a8 100644
> --- a/drivers/rtc/rtc-m41t80.c
> +++ b/drivers/rtc/rtc-m41t80.c
> @@ -546,6 +546,9 @@ static struct clk *m41t80_sqw_register_clk(struct m41t80_data *m41t80)
>  	struct clk_init_data init;
>  	int ret;
>  
> +	if (of_property_read_bool(node, "protected-clocks"))
> +		return 0;
> +
>  	/* First disable the clock */
>  	ret = i2c_smbus_read_byte_data(client, M41T80_REG_ALARM_MON);
>  	if (ret < 0)
> -- 
> 2.30.0
> 

-- 
Alexandre Belloni, co-owner and COO, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com

Re: [PATCHv1 1/6] rtc: m41t80: add support for protected clock

[Alexandre Belloni]

On 22/02/2021 22:20:47+0100, Alexandre Belloni wrote:
> On 22/02/2021 18:12:42+0100, Sebastian Reichel wrote:
> > Congatec's QMX6 system on module (SoM) uses a m41t62 as RTC. The
> > modules SQW clock output defaults to 32768 Hz. This behaviour is
> > used to provide the i.MX6 CKIL clock. Once the RTC driver is probed,
> > the clock is disabled and all i.MX6 functionality depending on
> > the 32 KHz clock has undefined behaviour. On systems using hardware
> > watchdog it seems to likely trigger a lot earlier than configured.
> > 
> > The proper solution would be to describe this dependency in DT,
> > but that will result in a deadlock. The kernel will see, that
> > i.MX6 system clock needs the RTC clock and do probe deferral.
> > But the i.MX6 I2C module never becomes usable without the i.MX6
> > CKIL clock and thus the RTC's clock will not be probed. So from
> > the kernel's perspective this is a chicken-and-egg problem.
> > 
> 
> Reading the previous paragraph, I was going to suggest describing the
> dependency and wondering whether this would cause a circular dependency.
> I guess this will keep being an issue for clocks on an I2C or SPI bus...
> 
> > Technically everything is fine by not touching anything, since
> > the RTC clock correctly enables the clock on reset (i.e. on
> > battery backup power loss) and also the bootloader enables it
> > in case a kernel without this support has been booted.
> > 
> > The 'protected-clocks' property is already in use for some clocks
> > that may not be touched because of firmware limitations and is
> > described in Documentation/devicetree/bindings/clock/clock-bindings.txt.
> > 
> > Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
> Acked-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

Or maybe you expected me to apply the patch, how are the following
patches dependent on this one?


-- 
Alexandre Belloni, co-owner and COO, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com

Re: [PATCHv1 5/6] dt-bindings: mtd: jedec,spi-nor: add sst25vf032b

[Rob Herring]

On Mon, Feb 22, 2021 at 11:13 AM Sebastian Reichel
<sebastian.reichel@collabora.com> wrote:
>
> The binding is already used by the driver. Update documentation
> accordingly.
>
> Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
> ---
>  Documentation/devicetree/bindings/mtd/jedec,spi-nor.txt | 1 +
>  1 file changed, 1 insertion(+)

This is now DT schema format. Landed in Linus' tree today.

Rob

Re: [PATCHv1 1/6] rtc: m41t80: add support for protected clock

[Sebastian Reichel]

[-- Attachment #1: Type: text/plain, Size: 2726 bytes --]

Hi,

On Mon, Feb 22, 2021 at 10:26:26PM +0100, Alexandre Belloni wrote:
> On 22/02/2021 22:20:47+0100, Alexandre Belloni wrote:
> > On 22/02/2021 18:12:42+0100, Sebastian Reichel wrote:
> > > Congatec's QMX6 system on module (SoM) uses a m41t62 as RTC. The
> > > modules SQW clock output defaults to 32768 Hz. This behaviour is
> > > used to provide the i.MX6 CKIL clock. Once the RTC driver is probed,
> > > the clock is disabled and all i.MX6 functionality depending on
> > > the 32 KHz clock has undefined behaviour. On systems using hardware
> > > watchdog it seems to likely trigger a lot earlier than configured.
> > > 
> > > The proper solution would be to describe this dependency in DT,
> > > but that will result in a deadlock. The kernel will see, that
> > > i.MX6 system clock needs the RTC clock and do probe deferral.
> > > But the i.MX6 I2C module never becomes usable without the i.MX6
> > > CKIL clock and thus the RTC's clock will not be probed. So from
> > > the kernel's perspective this is a chicken-and-egg problem.
> > > 
> > 
> > Reading the previous paragraph, I was going to suggest describing the
> > dependency and wondering whether this would cause a circular dependency.
> > I guess this will keep being an issue for clocks on an I2C or SPI bus...

Yes, it is a circular dependency on this particular system on
module. It only works because the RTC enables the clock by
default. The i.MX6 CKIL is expected to be always enabled.

> > > Technically everything is fine by not touching anything, since
> > > the RTC clock correctly enables the clock on reset (i.e. on
> > > battery backup power loss) and also the bootloader enables it
> > > in case a kernel without this support has been booted.
> > > 
> > > The 'protected-clocks' property is already in use for some clocks
> > > that may not be touched because of firmware limitations and is
> > > described in Documentation/devicetree/bindings/clock/clock-bindings.txt.
> > > 
> > > Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
> > Acked-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
> 
> Or maybe you expected me to apply the patch, how are the following
> patches dependent on this one?

The last patch, which introduces a new board has a runtime
dependency on this patch. Without this feature the board
goes into a reboot loop because its bootloader enables the
i.MX6 watchdog and without the CKIL its timing is messed up.

But it's a pure runtime dependency for a new board, so it should
be fine to merge this via your tree. It basically means the board
is only working once your tree and arm tree have been merged,
which seems ok from my POV.

-- Sebastian

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Re: [PATCHv1 5/6] dt-bindings: mtd: jedec,spi-nor: add sst25vf032b

[Sebastian Reichel]

[-- Attachment #1: Type: text/plain, Size: 622 bytes --]

Hi,

On Mon, Feb 22, 2021 at 06:15:11PM -0600, Rob Herring wrote:
> On Mon, Feb 22, 2021 at 11:13 AM Sebastian Reichel
> <sebastian.reichel@collabora.com> wrote:
> >
> > The binding is already used by the driver. Update documentation
> > accordingly.
> >
> > Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
> > ---
> >  Documentation/devicetree/bindings/mtd/jedec,spi-nor.txt | 1 +
> >  1 file changed, 1 insertion(+)
> 
> This is now DT schema format. Landed in Linus' tree today.

Indeed and it already contains sst,sst25vf032b.
This patch can be ignored.

Thanks,

-- Sebastian

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Re: [PATCHv1 1/6] rtc: m41t80: add support for protected clock

[Rob Herring]

On Tue, Feb 23, 2021 at 02:26:57AM +0100, Sebastian Reichel wrote:
> Hi,
> 
> On Mon, Feb 22, 2021 at 10:26:26PM +0100, Alexandre Belloni wrote:
> > On 22/02/2021 22:20:47+0100, Alexandre Belloni wrote:
> > > On 22/02/2021 18:12:42+0100, Sebastian Reichel wrote:
> > > > Congatec's QMX6 system on module (SoM) uses a m41t62 as RTC. The
> > > > modules SQW clock output defaults to 32768 Hz. This behaviour is
> > > > used to provide the i.MX6 CKIL clock. Once the RTC driver is probed,
> > > > the clock is disabled and all i.MX6 functionality depending on
> > > > the 32 KHz clock has undefined behaviour. On systems using hardware
> > > > watchdog it seems to likely trigger a lot earlier than configured.
> > > > 
> > > > The proper solution would be to describe this dependency in DT,
> > > > but that will result in a deadlock. The kernel will see, that
> > > > i.MX6 system clock needs the RTC clock and do probe deferral.
> > > > But the i.MX6 I2C module never becomes usable without the i.MX6
> > > > CKIL clock and thus the RTC's clock will not be probed. So from
> > > > the kernel's perspective this is a chicken-and-egg problem.
> > > > 
> > > 
> > > Reading the previous paragraph, I was going to suggest describing the
> > > dependency and wondering whether this would cause a circular dependency.
> > > I guess this will keep being an issue for clocks on an I2C or SPI bus...
> 
> Yes, it is a circular dependency on this particular system on
> module. It only works because the RTC enables the clock by
> default. The i.MX6 CKIL is expected to be always enabled.

I think you should describe the circular clocking and then provide a way 
to break the dependency. It's a somewhat common issue.

Rob

Re: [PATCHv1 3/6] dt-bindings: vendor-prefixes: add congatec

[Rob Herring]

On Mon, 22 Feb 2021 18:12:44 +0100, Sebastian Reichel wrote:
> Document binding for congatec.
> 
> Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
> ---
>  Documentation/devicetree/bindings/vendor-prefixes.yaml | 2 ++
>  1 file changed, 2 insertions(+)
> 

Acked-by: Rob Herring <robh@kernel.org>

Re: [PATCHv1 4/6] dt-bindings: arm: fsl: add GE B1x5pv2 boards

[Rob Herring]

On Mon, 22 Feb 2021 18:12:45 +0100, Sebastian Reichel wrote:
> Document the compatible for GE B1x5pv2 boards.
> 
> Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
> ---
>  Documentation/devicetree/bindings/arm/fsl.yaml | 11 +++++++++++
>  1 file changed, 11 insertions(+)
> 

Acked-by: Rob Herring <robh@kernel.org>

Re: [PATCHv1 1/6] rtc: m41t80: add support for protected clock

[Sebastian Reichel]

[-- Attachment #1: Type: text/plain, Size: 4777 bytes --]

Hi,

On Sat, Mar 06, 2021 at 11:56:45AM -0800, Rob Herring wrote:
> On Tue, Feb 23, 2021 at 02:26:57AM +0100, Sebastian Reichel wrote:
> > On Mon, Feb 22, 2021 at 10:26:26PM +0100, Alexandre Belloni wrote:
> > > On 22/02/2021 22:20:47+0100, Alexandre Belloni wrote:
> > > > On 22/02/2021 18:12:42+0100, Sebastian Reichel wrote:
> > > > > Congatec's QMX6 system on module (SoM) uses a m41t62 as RTC. The
> > > > > modules SQW clock output defaults to 32768 Hz. This behaviour is
> > > > > used to provide the i.MX6 CKIL clock. Once the RTC driver is probed,
> > > > > the clock is disabled and all i.MX6 functionality depending on
> > > > > the 32 KHz clock has undefined behaviour. On systems using hardware
> > > > > watchdog it seems to likely trigger a lot earlier than configured.
> > > > > 
> > > > > The proper solution would be to describe this dependency in DT,
> > > > > but that will result in a deadlock. The kernel will see, that
> > > > > i.MX6 system clock needs the RTC clock and do probe deferral.
> > > > > But the i.MX6 I2C module never becomes usable without the i.MX6
> > > > > CKIL clock and thus the RTC's clock will not be probed. So from
> > > > > the kernel's perspective this is a chicken-and-egg problem.
> > > > > 
> > > > 
> > > > Reading the previous paragraph, I was going to suggest describing the
> > > > dependency and wondering whether this would cause a circular dependency.
> > > > I guess this will keep being an issue for clocks on an I2C or SPI bus...
> > 
> > Yes, it is a circular dependency on this particular system on
> > module. It only works because the RTC enables the clock by
> > default. The i.MX6 CKIL is expected to be always enabled.
> 
> I think you should describe the circular clocking and then provide a way 
> to break the dependency.

This is very much not trivial. The clock is required during early
initialization of the i.MX. At this point we are far from probing
I2C drivers and without the I2C driver the clock is not registered.
The current i.MX code expects the system clocks to be fixed clocks,
since they must be enabled before any code is executed (incl.
bootloader) and must never be disabled. From a HW design point of
view it does not make sense to have a SW controllable clock for it,
since it just adds extra cost. I believe for QMX6 it is only SW
controllable, because that avoids the need for an extra crystal.

So how is the clock framework supposed to know, that it can ignore
the clock during registration? I see the following options:

1. My solution is the simplest one. Keep i.MX clock code the same
   (it assumes a fixed-clock being used for CKIL) and avoid
   registering RTC clock. This basically means the RTC is considered
   to be a fixed-clock on this system, which is what the HW designers
   seemed to have in mind (vendor kernel for the QMX6 is old enough
   (4.9.x) to not to have CLK feature in the RTC driver. Vendor
   U-Boot also does not touch the RTC. Booting mainline kernel once
   bricks QMX6 boards until RTC battery is removed, so one could
   actually argue addition of the CLK feature in 1373e77b4f10 (4.13)
   is a regression). Currently Qualcomm device uses "protected-clocks"
   for FW controlled clocks where Linux would crash the system by
   trying to access them. IMHO the RTC is similar, since disabling
   or modifying its frequency on QMX6 results in undefined behaviour
   and possibly system crash.

2. Make i.MX clock code use the RTC as CKIL clock provider, but
   ignore it somehow. I see three sub-options:

2.1. Add a property 'boot-enabled' to the RTC node, so that the
     clock framework is aware of clock being enabled. This can
     be used to satisfy clock dependencies somehow.

2.2. The RTC device is not probed without I2C bus, but the driver
     could also register a fake clock purely based on DT
     information by adding some early init hook and take over
     the clock once the I2C part is being probed. I think this
     is a bad idea regarding maintainability of the driver.
     Also for systems not using the RTC clock, the early clock
     registration is basically wrong: If the kernel disables
     the RTC it will stay disabled across boots if the RTC has
     a backup battery. Basically we cannot imply anything from
     the RTC compatible value alone.

2.3 The i.MX core code could request CKIL with some flag, that
    it's fine to have an unresolvable clock and just expect it
    to be boot-enabled. The rationale would be, that CKIL must
    be always-enabled.

> It's a somewhat common issue.

It is? This only works, because one can treat the RTC's clock
output like a fixed clock by not messing around with it.

-- Sebastian

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Re: [PATCHv1 1/6] rtc: m41t80: add support for protected clock

[Rob Herring]

On Mon, Mar 08, 2021 at 03:03:58PM +0100, Sebastian Reichel wrote:
> Hi,
> 
> On Sat, Mar 06, 2021 at 11:56:45AM -0800, Rob Herring wrote:
> > On Tue, Feb 23, 2021 at 02:26:57AM +0100, Sebastian Reichel wrote:
> > > On Mon, Feb 22, 2021 at 10:26:26PM +0100, Alexandre Belloni wrote:
> > > > On 22/02/2021 22:20:47+0100, Alexandre Belloni wrote:
> > > > > On 22/02/2021 18:12:42+0100, Sebastian Reichel wrote:
> > > > > > Congatec's QMX6 system on module (SoM) uses a m41t62 as RTC. The
> > > > > > modules SQW clock output defaults to 32768 Hz. This behaviour is
> > > > > > used to provide the i.MX6 CKIL clock. Once the RTC driver is probed,
> > > > > > the clock is disabled and all i.MX6 functionality depending on
> > > > > > the 32 KHz clock has undefined behaviour. On systems using hardware
> > > > > > watchdog it seems to likely trigger a lot earlier than configured.
> > > > > > 
> > > > > > The proper solution would be to describe this dependency in DT,
> > > > > > but that will result in a deadlock. The kernel will see, that
> > > > > > i.MX6 system clock needs the RTC clock and do probe deferral.
> > > > > > But the i.MX6 I2C module never becomes usable without the i.MX6
> > > > > > CKIL clock and thus the RTC's clock will not be probed. So from
> > > > > > the kernel's perspective this is a chicken-and-egg problem.
> > > > > > 
> > > > > 
> > > > > Reading the previous paragraph, I was going to suggest describing the
> > > > > dependency and wondering whether this would cause a circular dependency.
> > > > > I guess this will keep being an issue for clocks on an I2C or SPI bus...
> > > 
> > > Yes, it is a circular dependency on this particular system on
> > > module. It only works because the RTC enables the clock by
> > > default. The i.MX6 CKIL is expected to be always enabled.
> > 
> > I think you should describe the circular clocking and then provide a way 
> > to break the dependency.
> 
> This is very much not trivial. The clock is required during early
> initialization of the i.MX. At this point we are far from probing
> I2C drivers and without the I2C driver the clock is not registered.
> The current i.MX code expects the system clocks to be fixed clocks,
> since they must be enabled before any code is executed (incl.
> bootloader) and must never be disabled. From a HW design point of
> view it does not make sense to have a SW controllable clock for it,
> since it just adds extra cost. I believe for QMX6 it is only SW
> controllable, because that avoids the need for an extra crystal.
> 
> So how is the clock framework supposed to know, that it can ignore
> the clock during registration? I see the following options:
> 
> 1. My solution is the simplest one. Keep i.MX clock code the same
>    (it assumes a fixed-clock being used for CKIL) and avoid
>    registering RTC clock. This basically means the RTC is considered
>    to be a fixed-clock on this system, which is what the HW designers
>    seemed to have in mind (vendor kernel for the QMX6 is old enough
>    (4.9.x) to not to have CLK feature in the RTC driver. Vendor
>    U-Boot also does not touch the RTC. Booting mainline kernel once
>    bricks QMX6 boards until RTC battery is removed, so one could
>    actually argue addition of the CLK feature in 1373e77b4f10 (4.13)
>    is a regression). Currently Qualcomm device uses "protected-clocks"
>    for FW controlled clocks where Linux would crash the system by
>    trying to access them. IMHO the RTC is similar, since disabling
>    or modifying its frequency on QMX6 results in undefined behaviour
>    and possibly system crash.
> 
> 2. Make i.MX clock code use the RTC as CKIL clock provider, but
>    ignore it somehow. I see three sub-options:
> 
> 2.1. Add a property 'boot-enabled' to the RTC node, so that the
>      clock framework is aware of clock being enabled. This can
>      be used to satisfy clock dependencies somehow.
> 
> 2.2. The RTC device is not probed without I2C bus, but the driver
>      could also register a fake clock purely based on DT
>      information by adding some early init hook and take over
>      the clock once the I2C part is being probed. I think this
>      is a bad idea regarding maintainability of the driver.
>      Also for systems not using the RTC clock, the early clock
>      registration is basically wrong: If the kernel disables
>      the RTC it will stay disabled across boots if the RTC has
>      a backup battery. Basically we cannot imply anything from
>      the RTC compatible value alone.
> 
> 2.3 The i.MX core code could request CKIL with some flag, that
>     it's fine to have an unresolvable clock and just expect it
>     to be boot-enabled. The rationale would be, that CKIL must
>     be always-enabled.

I think 2.1 or 2.3 is fine. It boils down to detecting a cycle and then 
either you have a property or implicitly know to ignore a dependency.

> > It's a somewhat common issue.
> 
> It is? This only works, because one can treat the RTC's clock
> output like a fixed clock by not messing around with it.

Well, it's not the first time I've heard of the issue. Audio clocks are 
another example, but a bit different in that the clocks aren't needed 
until later. It's also come up in context of fw_devlinks which I 
think has some cycle breaking logic already.

Rob