Second set of u-boot-atmel features and fixes for 2020.01 cycle

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Merge tag 'u-boot-atmel-2020.01-b' of https://gitlab.denx.de/u-boot/custodians/u-boot-atmel

Second set of u-boot-atmel features and fixes for 2020.01 cycle

This feature set includes Eugen's work on a new tiny flexcom driver and
eeprom mac retrieval for the sam9x60-ek board.

MAINTAINERS

@@ -246,6 +246,7 @@ S:	Maintained
 T:	git https://gitlab.denx.de/u-boot/custodians/u-boot-atmel.git
 F:	arch/arm/mach-at91/
 F:	board/atmel/
+F:	drivers/misc/microchip_flexcom.c
 
 ARM OWL
 M:	Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>

arch/arm/dts/sam9x60.dtsi

@@ -73,6 +73,16 @@
 				status = "disabled";
 			};
 
+			flx0: flexcom@f801c600 {
+				compatible = "atmel,sama5d2-flexcom";
+				reg = <0xf801c000 0x200>;
+				clocks = <&flx0_clk>;
+				#address-cells = <1>;
+				#size-cells = <1>;
+				ranges = <0x0 0xf801c000 0x800>;
+				status = "disabled";
+			};
+
 			macb0: ethernet@f802c000 {
 				compatible = "cdns,sam9x60-macb", "cdns,macb";
 				reg = <0xf802c000 0x100>;
@@ -221,6 +231,11 @@
 						reg = <3>;
 					};
 
+					flx0_clk: flx0_clk {
+						#clock-cells = <0>;
+						reg = <5>;
+					};
+
 					pioD_clk: pioD_clk {
 						#clock-cells = <0>;
 						reg = <44>;

arch/arm/dts/sam9x60ek.dts

@@ -15,6 +15,7 @@
 
 	chosen {
 		stdout-path = &dbgu;
+		i2c0 = &flx0;
 	};
 
 	onewire_tm: onewire {
@@ -45,6 +46,28 @@
 				};
 			};
 
+			flx0: flexcom@f801c600 {
+				atmel,flexcom-mode = <3>;
+				status = "okay";
+
+				i2c@600 {
+					compatible = "atmel,sama5d2-i2c";
+					reg = <0x600 0x200>;
+					pinctrl-names = "default";
+					pinctrl-0 = <&pinctrl_flx0>;
+					#address-cells = <1>;
+					#size-cells = <0>;
+					clocks = <&flx0_clk>;
+					status = "okay";
+
+					eeprom@53 {
+						compatible = "atmel,24c32";
+						reg = <0x53>;
+						pagesize = <16>;
+					};
+				};
+			};
+
 			pinctrl {
 					pinctrl_qspi: qspi {
 						atmel,pins =
@@ -56,6 +79,12 @@
 							 AT91_PIOB 24 AT91_PERIPH_A AT91_PINCTRL_PULL_UP>;
 					};
 
+					pinctrl_flx0: flx0_default {
+						atmel,pins =
+							<AT91_PIOA 0 AT91_PERIPH_A AT91_PINCTRL_NONE
+							 AT91_PIOA 1 AT91_PERIPH_A AT91_PINCTRL_NONE>;
+					};
+
 					pinctrl_onewire_tm_default: onewire_tm_default {
 						atmel,pins =
 							<AT91_PIOD 14 AT91_PERIPH_GPIO AT91_PINCTRL_PULL_UP>;

board/atmel/sam9x60ek/sam9x60ek.c

@@ -106,6 +106,18 @@ int board_early_init_f(void)
 }
 #endif
 
+#define MAC24AA_MAC_OFFSET     0xfa
+
+#ifdef CONFIG_MISC_INIT_R
+int misc_init_r(void)
+{
+#ifdef CONFIG_I2C_EEPROM
+	at91_set_ethaddr(MAC24AA_MAC_OFFSET);
+#endif
+	return 0;
+}
+#endif
+
 int board_init(void)
 {
 	/* address of boot parameters */

configs/sam9x60ek_mmc_defconfig

@@ -15,10 +15,13 @@ CONFIG_BOOTDELAY=3
 CONFIG_USE_BOOTARGS=y
 CONFIG_BOOTARGS="mem=256M console=ttyS0,115200 root=/dev/mmcblk0p2 rw rootfstype=ext4 rootwait"
 CONFIG_SYS_CONSOLE_IS_IN_ENV=y
+CONFIG_MISC_INIT_R=y
 # CONFIG_DISPLAY_BOARDINFO is not set
 CONFIG_HUSH_PARSER=y
 CONFIG_SYS_PROMPT="U-Boot> "
 CONFIG_CMD_BOOTZ=y
+CONFIG_CMD_DM=y
+CONFIG_CMD_I2C=y
 CONFIG_CMD_MMC=y
 # CONFIG_CMD_SETEXPR is not set
 CONFIG_CMD_DHCP=y
@@ -35,6 +38,10 @@ CONFIG_CLK_AT91=y
 CONFIG_AT91_GENERIC_CLK=y
 CONFIG_DM_GPIO=y
 CONFIG_AT91_GPIO=y
+CONFIG_DM_I2C=y
+CONFIG_SYS_I2C_AT91=y
+CONFIG_I2C_EEPROM=y
+CONFIG_MICROCHIP_FLEXCOM=y
 CONFIG_DM_MMC=y
 CONFIG_MMC_SDHCI=y
 CONFIG_MMC_SDHCI_ATMEL=y

configs/sam9x60ek_nandflash_defconfig

@@ -14,10 +14,13 @@ CONFIG_BOOTDELAY=3
 CONFIG_USE_BOOTARGS=y
 CONFIG_BOOTARGS="console=ttyS0,115200 earlyprintk mtdparts=atmel_nand:256k(bootstrap)ro,768k(uboot)ro,256k(env_redundant),256k(env),512k(dtb),6M(kernel)ro,-(rootfs) rootfstype=ubifs ubi.mtd=12 root=ubi0:rootfs rw"
 CONFIG_SYS_CONSOLE_IS_IN_ENV=y
+CONFIG_MISC_INIT_R=y
 # CONFIG_DISPLAY_BOARDINFO is not set
 CONFIG_HUSH_PARSER=y
 CONFIG_SYS_PROMPT="U-Boot> "
 CONFIG_CMD_BOOTZ=y
+CONFIG_CMD_DM=y
+CONFIG_CMD_I2C=y
 # CONFIG_CMD_FLASH is not set
 CONFIG_CMD_MMC=y
 CONFIG_CMD_NAND=y
@@ -37,6 +40,10 @@ CONFIG_CLK_AT91=y
 CONFIG_AT91_GENERIC_CLK=y
 CONFIG_DM_GPIO=y
 CONFIG_AT91_GPIO=y
+CONFIG_DM_I2C=y
+CONFIG_SYS_I2C_AT91=y
+CONFIG_I2C_EEPROM=y
+CONFIG_MICROCHIP_FLEXCOM=y
 CONFIG_DM_MMC=y
 CONFIG_GENERIC_ATMEL_MCI=y
 CONFIG_PHY_MICREL=y

configs/sam9x60ek_qspiflash_defconfig

@@ -16,10 +16,13 @@ CONFIG_BOOTDELAY=3
 CONFIG_USE_BOOTARGS=y
 CONFIG_BOOTARGS="console=ttyS0,115200 earlyprintk mtdparts=atmel_nand:256k(bootstrap)ro,768k(uboot)ro,256k(env_redundant),256k(env),512k(dtb),6M(kernel)ro,-(rootfs) rootfstype=ubifs ubi.mtd=12 root=ubi0:rootfs rw"
 CONFIG_SYS_CONSOLE_IS_IN_ENV=y
+CONFIG_MISC_INIT_R=y
 # CONFIG_DISPLAY_BOARDINFO is not set
 CONFIG_HUSH_PARSER=y
 CONFIG_SYS_PROMPT="U-Boot> "
 CONFIG_CMD_BOOTZ=y
+CONFIG_CMD_DM=y
+CONFIG_CMD_I2C=y
 # CONFIG_CMD_FLASH is not set
 CONFIG_CMD_MMC=y
 CONFIG_CMD_NAND=y
@@ -48,6 +51,10 @@ CONFIG_CLK_AT91=y
 CONFIG_AT91_GENERIC_CLK=y
 CONFIG_DM_GPIO=y
 CONFIG_AT91_GPIO=y
+CONFIG_DM_I2C=y
+CONFIG_SYS_I2C_AT91=y
+CONFIG_I2C_EEPROM=y
+CONFIG_MICROCHIP_FLEXCOM=y
 CONFIG_DM_MMC=y
 CONFIG_GENERIC_ATMEL_MCI=y
 CONFIG_MTD=y

drivers/misc/Kconfig

@@ -412,4 +412,13 @@ config IHS_FPGA
 	  by the devices. This driver supports both CON and CPU variants of the
 	  devices, depending on the device tree entry.
 
+config MICROCHIP_FLEXCOM
+	bool "Enable Microchip Flexcom driver"
+	depends on MISC
+	help
+	  The Atmel Flexcom is just a wrapper which embeds a SPI controller,
+	  an I2C controller and an USART.
+	  Only one function can be used at a time and is chosen at boot time
+	  according to the device tree.
+
 endmenu

drivers/misc/Makefile

@@ -65,3 +65,4 @@ obj-$(CONFIG_TWL4030_LED) += twl4030_led.o
 obj-$(CONFIG_VEXPRESS_CONFIG) += vexpress_config.o
 obj-$(CONFIG_WINBOND_W83627) += winbond_w83627.o
 obj-$(CONFIG_JZ4780_EFUSE) += jz4780_efuse.o
+obj-$(CONFIG_MICROCHIP_FLEXCOM) += microchip_flexcom.o

drivers/misc/microchip_flexcom.c

@@ -0,0 +1,64 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2019, Microchip Technology, Inc.
+ * Author: Eugen Hristev <eugen.hristev@microchip.com>
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <errno.h>
+#include <misc.h>
+#include <asm/io.h>
+
+struct microchip_flexcom_regs {
+	u32 cr;
+};
+
+struct microchip_flexcom_platdata {
+	struct microchip_flexcom_regs *regs;
+	u32 flexcom_mode;
+};
+
+static int microchip_flexcom_ofdata_to_platdata(struct udevice *dev)
+{
+	struct microchip_flexcom_platdata *plat = dev_get_platdata(dev);
+	int ret;
+
+	plat->regs = map_physmem(devfdt_get_addr(dev),
+				 sizeof(struct microchip_flexcom_regs),
+				MAP_NOCACHE);
+
+	ret = dev_read_u32(dev, "atmel,flexcom-mode", &plat->flexcom_mode);
+
+	if (IS_ERR_VALUE(ret)) {
+		debug("Missing atmel,flexcom-mode property\n");
+		return ret;
+	}
+
+	/*
+	 * The mode must have only 2 bits. If any other bits are set,
+	 * the value is not supported.
+	 */
+	if (plat->flexcom_mode & 0xfffffffc) {
+		debug("Wrong atmel,flexcom-mode property\n");
+		return -EINVAL;
+	}
+
+	writel(plat->flexcom_mode, &plat->regs->cr);
+
+	return 0;
+}
+
+static const struct udevice_id microchip_flexcom_ids[] = {
+	{ .compatible = "atmel,sama5d2-flexcom" },
+	{ .compatible = "microchip,flexcom" },
+	{}
+};
+
+U_BOOT_DRIVER(microchip_flexcom) = {
+	.name	= "microchip_flexcom",
+	.id	= UCLASS_MISC,
+	.of_match = microchip_flexcom_ids,
+	.ofdata_to_platdata = microchip_flexcom_ofdata_to_platdata,
+	.platdata_auto_alloc_size = sizeof(struct microchip_flexcom_platdata),
+};