dt-gpionames: Add new utility to generate gpio-line-names

Use the named-gpios node to generate the GPIO
controller gpio-line-names properties.

BUG=none
TEST=build and confirm that gpio-lines-names is correct
BRANCH=none

Signed-off-by: Andrew McRae <amcrae@google.com>
Change-Id: I39b8990b6cf2fad6c4c1e2196263774c996eb0cd
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/3426242
Reviewed-by: Eizan Miyamoto <eizan@chromium.org>

4 files changed, 560 insertions, 0 deletions

diff --git a/util/dt-gpionames/README.md b/util/dt-gpionames/README.md
new file mode 100644
index 0000000000..06b9a1c4b6
--- /dev/null
+++ b/util/dt-gpionames/README.md
@@ -0,0 +1,114 @@
+# dt-gpionames
+
+## Overview
+
+This program reads a compiled device tree file (DTB), and creates
+a device tree source (DTS) fragment that initialises the `gpio-line-names`
+for each GPIO controller.
+
+The `named-gpios` compatible node is used as the source of the names. Each child node
+of the `named-gpios` node is named from a EC pin name, has a `gpios` property
+referencing the GPIO pin.
+
+The program matches the GPIO controller and pin for each of the `named-gpios` entries,
+and creates overlay DTS fragments for each of the GPIO controllers setting the `gpio-line-names`.
+
+The purpose of this program is to help upstream the EC GPIO support, specifically
+to enable a Zephyr based console command equivalent to `gpioget` and `gpioset`.
+
+Currently these commands rely on the existence of the `named-gpios` child nodes to
+specify the engineer-friendly name of the GPIO pins. However, core Zephyr does not
+use `named-gpios`, and any command upstreamed to Zephyr should only rely on
+the core Zephyr API and interfaces (and the `gpio-line-names` property is a standard attribute of
+the Zephyr GPIO definition).
+
+Using this program, a DTS fragment can be generated from an existing DTS with a `named-gpios` node
+that will allow an upstreamed `gpioget`/`gpioset` command to operate.
+
+## Building
+
+This program uses an external library to read the DTB; this external library requires
+go 1.17 at the minimum, and currently the ChromeOS SDK installs go 1.15, so this
+program will require building outside of the SDK:
+
+```
+[from home directory outside the SDK]
+cd ~/chromiumos/src/platform/ec/util/dt-gpionames
+go build
+
+```
+
+This builds the `dt-gpionames` binary in this directory.
+
+## Executing
+
+The program input expects a compiled, flattened device tree binary (DTB) file.
+This can built from an existing device tree source file using the device tree compiler (dtc),
+which is installed in the SDK by default.
+
+The source file for the compiler can be obtained from a device tree source file generated as part
+of a project build.
+
+So the complete process is (using the nivviks project target as an example):
+
+```
+[within the SDK]
+cd ../src/platform/ec/zephyr
+zmake configure -b nivviks
+cd ../util/dt-gpionames
+dtc --out /tmp/dt.dtb ../../build/zephyr/nivviks/build-ro/zephyr/zephyr.dts
+./dt-gpionames --output gpionames.dts --input /tmp/dt.dtb
+```
+
+This `gpionames.dts` can then be copied and added to the project's device tree source files.
+
+## Examples
+
+If the `named-gpios` node contained:
+```
+	named-gpios {
+		compatible = "named-gpios";
+
+		gpio_slp_s4_l: slp_s4_l {
+			#gpio-cells = < 0x0 >;
+			gpios = < &gpio7 0x0 0x100 >;
+		};
+		gpio_ec_soc_pch_pwrok_od: ec_soc_pch_pwrok_od {
+			#gpio-cells = < 0x0 >;
+			gpios = < &gpio7 0x2 0xa06 >;
+		};
+		gpio_ec_gsc_packet_mode: ec_gsc_packet_mode {
+			#gpio-cells = < 0x0 >;
+			gpios = < &gpio7 0x5 0x100 >;
+			enum-name = "GPIO_PACKET_MODE_EN";
+		};
+		gpio_ec_soc_rtcrst: ec_soc_rtcrst {
+			#gpio-cells = < 0x0 >;
+			gpios = < &gpio7 0x6 0x200 >;
+		};
+...
+	};
+```
+
+The GPIO controllers DTS fragment would be:
+
+```
+/ {
+        soc {
+                gpio@4008f000 {
+                        gpio-line-names =
+                                "slp_s4_l",
+                                "",
+                                "ec_soc_pch_pwrok_od",
+                                "",
+                                "",
+                                "ec_gsc_packet_mode",
+                                "ec_soc_rtcrst";
+                };
+	};
+};
+```
+
+## Testing
+
+Since this is considered a one-off utility, there are no unit tests yet.
diff --git a/util/dt-gpionames/dt.go b/util/dt-gpionames/dt.go
new file mode 100644
index 0000000000..547d69708f
--- /dev/null
+++ b/util/dt-gpionames/dt.go
@@ -0,0 +1,203 @@
+// Copyright 2022 The Chromium OS Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Utility to read a flattened device tree file (DTB) and create a
+// DTS fragment initialising the GPIO controller gpio-line-names
+// property.
+// The input DTB can be generated from device tree source (DTS) using
+// the standard device tree compiler (dtc) e.g
+//
+//   dtc --out zephyr.dtb zephyr.dts
+//   gt-gpionames --output gpio_names.dts --input zephyr.dtb
+//
+
+package main
+
+import (
+	"encoding/binary"
+	"flag"
+	"fmt"
+	"io"
+	"log"
+	"os"
+
+	"github.com/u-root/u-root/pkg/dt"
+)
+
+var input = flag.String("input", "", "Input DTB file")
+var output = flag.String("output", "", "Output file")
+
+type Gpio struct {
+	node *dt.Node // Device tree node
+	pins []string // Slice of pin names
+	max  int      // Last slice entry containing a name
+}
+
+func main() {
+	flag.Parse()
+	f, err := os.Open(*input)
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer f.Close()
+	fdt, err := dt.ReadFDT(f)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	gm := findGpioControllers(fdt)
+	ng := findNamedGpios(fdt)
+	setLineNames(gm, ng)
+
+	of, err := os.Create(*output)
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer of.Close()
+	writeLineNames(of, gm)
+}
+
+// writeLineNames generates DTS to set the gpio-line-names
+// string array property for each of the GPIO controllers
+// TODO: It may be cleaner to use a template rather than
+// generating each line separately.
+func writeLineNames(of io.Writer, gm map[dt.PHandle]*Gpio) {
+	fmt.Fprintf(of, "/ {\n")
+	fmt.Fprintf(of, "\tsoc {\n")
+	for _, g := range gm {
+		if g.max < 0 {
+			continue
+		}
+		first := true
+		fmt.Fprintf(of, "\t\t%s {\n", g.node.Name)
+		fmt.Fprintf(of, "\t\t\tgpio-line-names =")
+		for i := 0; i <= g.max; i++ {
+			if !first {
+				fmt.Fprintf(of, ",")
+			}
+			fmt.Fprintf(of, "\n\t\t\t\t\"%s\"", g.pins[i])
+			first = false
+		}
+		fmt.Fprintf(of, ";\n")
+		fmt.Fprintf(of, "\t\t};\n")
+	}
+	fmt.Fprintf(of, "\t};\n")
+	fmt.Fprintf(of, "};\n")
+}
+
+// findGpioControllers walks the nodes of the
+// flattened device tree, detecting the
+// GPIO controller nodes (which should have the 'gpio-controller'
+// property on them), and adds them to the map.
+func findGpioControllers(fdt *dt.FDT) map[dt.PHandle]*Gpio {
+	gm := make(map[dt.PHandle]*Gpio)
+	// Walk the tree and find all the GPIO controllers
+	gpios, err := fdt.Root().FindAll(func(n *dt.Node) bool {
+		_, ok := n.LookProperty("gpio-controller")
+		return ok
+	})
+	if err != nil {
+		log.Fatal(err)
+	}
+	// For each of the controllers, create a structure containing
+	// the slice of pin names, and add it to the map using
+	// the phandle as the key.
+	for _, n := range gpios {
+		// Default of 32 pins per controller.
+		var npins uint32 = 32
+		pinsProp, ok := n.LookProperty("ngpios")
+		if ok {
+			npins, err = pinsProp.AsU32()
+			if err != nil {
+				log.Printf("%s illegal number of pins (%v), ignored\n", n.Name, err)
+				continue
+			}
+		}
+		p, ok := n.LookProperty("phandle")
+		if !ok {
+			// No phandle, so not referenced.
+			log.Printf("%s not referenced, ignored\n", n.Name)
+			continue
+		}
+		ph, err := p.AsPHandle()
+		if err != nil {
+			log.Printf("%s illegal phandle (%v), ignored\n", n.Name, err)
+			continue
+		}
+		gpio := new(Gpio)
+		gpio.node = n
+		gpio.pins = make([]string, npins)
+		gpio.max = -1
+		gm[ph] = gpio
+	}
+	return gm
+}
+
+// findNamesGpios will walk the device tree and extract all the
+// child nodes of the nodes with compatible = "named-gpio",
+// and return the slice containing these nodes.
+func findNamedGpios(fdt *dt.FDT) []*dt.Node {
+	ng := make([]*dt.Node, 0)
+	err := fdt.RootNode.Walk(func(n *dt.Node) error {
+		p, ok := n.LookProperty("compatible")
+		if ok {
+			s, err := p.AsType(dt.StringType)
+			if err == nil && s == "named-gpios" {
+				ng = append(ng, n.Children...)
+			}
+		}
+		return nil
+	})
+	if err != nil {
+		log.Fatal(err)
+	}
+	return ng
+}
+
+// setLineNames will add the named-gpio node names to the GPIO controller
+// line names for the associated pin.
+func setLineNames(gm map[dt.PHandle]*Gpio, ngList []*dt.Node) {
+	for _, ng := range ngList {
+		gp, ok := ng.LookProperty("gpios")
+		if !ok {
+			log.Printf("No valid gpios on %s\n", ng.Name)
+			continue
+		}
+		// Get the flattened byte string representing
+		// the GPIO. The array contains:
+		//   32 bit PHandle referencing the GPIO controller
+		//   32 bit pin number
+		//   32 bit flags
+		blk, err := gp.AsPropEncodedArray()
+		if err != nil {
+			log.Printf("%s: %v\n", ng.Name, err)
+			continue
+		}
+		if len(blk) != 12 {
+			log.Printf("%s: Wrong size on gpios PHA(%d)\n", ng.Name, len(blk))
+			continue
+		}
+		ph := binary.BigEndian.Uint32(blk[0:])
+		pin := binary.BigEndian.Uint32(blk[4:])
+		gpio, ok := gm[dt.PHandle(ph)]
+		if !ok {
+			log.Printf("No GPIO controller for %s (PH %d)\n", ng.Name, ph)
+			continue
+		}
+		if int(pin) >= len(gpio.pins) {
+			log.Printf("GPIO %s pin %d out of range for %s (max %d)\n",
+				ng.Name, pin, gpio.node.Name, len(gpio.pins))
+			continue
+		}
+		if gpio.pins[pin] != "" {
+			log.Printf("GPIO %s pin %d already has name (%s)\n",
+				ng.Name, pin, gpio.pins[pin])
+			continue
+		}
+		gpio.pins[pin] = ng.Name
+		if int(pin) > gpio.max {
+			gpio.max = int(pin)
+		}
+	}
+}
diff --git a/util/dt-gpionames/go.mod b/util/dt-gpionames/go.mod
new file mode 100644
index 0000000000..2a83ecdd03
--- /dev/null
+++ b/util/dt-gpionames/go.mod
@@ -0,0 +1,5 @@
+module dt-gpionames
+
+go 1.15
+
+require github.com/u-root/u-root v1.0.1
diff --git a/util/dt-gpionames/go.sum b/util/dt-gpionames/go.sum
new file mode 100644
index 0000000000..e982990133
--- /dev/null
+++ b/util/dt-gpionames/go.sum
@@ -0,0 +1,238 @@
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