st7735s: add (step 1) simple module for spi and dts

Signed-off-by: Andrey Pahomov <[email protected]>

st7735s/Makefile

@@ -0,0 +1,43 @@
+MODULE_NAME=st7735s
+
+ifneq ($(KERNELRELEASE),)
+
+obj-m :=$(MODULE_NAME).o
+
+else
+
+ccflags-y := -Wall
+DT_SRCS=$(wildcard *.dts)
+DT_OBJS=$(DT_SRCS:.dts=.dtbo)
+DTC_FLAGS ?= -i $(DCT_EXTRA_PATH)
+
+
+.PHONY: all clean
+
+all: $(DT_OBJS)
+	$(MAKE) -C $(BUILD_KERNEL) M=$(PWD) modules
+
+clean:
+	$(MAKE) -C $(BUILD_KERNEL) M=$(PWD) clean
+	-rm ./*.dtbo
+
+
+$(DT_OBJS): $(DT_SRCS)
+	$(DTC) -@ -I dts -O dtb -o $@ $<
+
+
+upload_config:
+	ssh-copy-id -i ~/.ssh/id_rsa.pub $(SSH_ORANGE)
+	echo $(KERNEL_VERSION)
+	-ssh $(SSH_ORANGE) '[ ! -d "/lib/modules/$(KERNEL_VERSION)/kernel/drivers/" ] && mkdir -p "/lib/modules/$(KERNEL_VERSION)/kernel/drivers/"'
+
+upload_dtso: $(DT_OBJS)
+	-scp $< $(SSH_ORANGE):/boot/dtb/overlay/
+
+upload_module: $(MODULE_NAME).ko
+	-scp $< $(SSH_ORANGE):/lib/modules/$(KERNEL_VERSION)/kernel/drivers/
+	-ssh $(SSH_ORANGE) 'depmod'
+
+upload: upload_dtso upload_module
+
+endif

st7735s/env.sh

@@ -0,0 +1,12 @@
+#!/bin/bash
+
+export BUILD_KERNEL=$(pwd)/../../build/kernel_opi
+export KERNEL_VERSION=5.4.0-rc1-00258-g2d00aee21a5d
+export DTC=$BUILD_KERNEL/scripts/dtc/dtc
+export CROSS_COMPILE=$(pwd)/../../toolchain/gcc-linaro-7.4.1-2019.02-x86_64_arm-linux-gnueabihf/bin/arm-linux-gnueabihf-
+export ARCH=arm
+export [email protected]
+#export INCLUDE_DTS=/home/tymbys/WORK/GL/linux/arch/arm/boot/dts
+export DCT_EXTRA_PATH=/home/tymbys/WORK/GL/linux/
+
+make clean && make && make upload

st7735s/st7735s.c

@@ -0,0 +1,79 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *  st7735s.c - Display driver
+ *
+ *  Copyright (C) 2020 Andrey Pahomov <[email protected]>
+ */
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/spi/spi.h>
+
+
+static int st7735s_probe(struct spi_device *spi)
+{
+	int ret;
+
+	dev_info(&spi->dev, "%s:%d\n", __func__, __LINE__);
+
+	spi->bits_per_word = 8;
+	spi->mode = SPI_MODE_0;
+	spi->max_speed_hz = 500000;
+	ret = spi_setup(spi);
+	if (ret < 0)
+		return ret;
+
+	dev_info(&spi->dev, "%s:%d\n", __func__, __LINE__);
+	return 0;
+
+}
+
+
+static int st7735s_remove(struct spi_device *spi)
+{
+	return 0;
+}
+
+
+
+static const struct of_device_id of_tbl[] = {
+	{.compatible = "st7735s",},
+	{},
+};
+
+MODULE_DEVICE_TABLE(of, of_tbl);
+
+static struct spi_driver st7735s_driver = {
+	.driver = {
+		.name		= "st7735s",
+		.of_match_table = of_tbl,
+		.owner		= THIS_MODULE,
+	},
+
+	.probe		= st7735s_probe,
+	.remove		= st7735s_remove,
+};
+
+
+
+
+static int st7735s_init(void)
+{
+	pr_info("%s:%d\n", __func__, __LINE__);
+	return spi_register_driver(&st7735s_driver);
+}
+
+static void st7735s_exit(void)
+{
+	pr_info("%s:%d\n", __func__, __LINE__);
+	spi_unregister_driver(&st7735s_driver);
+}
+
+module_init(st7735s_init);
+module_exit(st7735s_exit);
+
+MODULE_AUTHOR("Andrey Pahomov <[email protected]>");
+MODULE_DESCRIPTION("st7735s SPI display");
+MODULE_LICENSE("GPL");
+MODULE_VERSION("0.1");

st7735s/sun8i-h3-st7735s.dts

@@ -0,0 +1,36 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *  sun8i-h3-st7735s.dts - Display driver
+ *
+ *  Copyright (C) 2020 Andrey Pahomov <[email protected]>
+ */
+/dts-v1/;
+/plugin/;
+
+/ {
+	compatible = "allwinner,sun8i-h3";
+
+	fragment@0 {
+		target-path = "/soc/spi@1c68000";
+			__overlay__ {
+				status = "okay";
+/*
+				spidev@0 {
+					compatible = "spidev";
+					spi-max-frequency = <10000000>;
+					reg = <0>;
+					status = "okay";
+				};
+*/
+
+				st7735s {
+					compatible = "st7735s";
+					spi-max-frequency = <10000000>;
+					reg = <0>;
+					status = "okay";
+				};
+
+		};
+	};
+};
+