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fa70b3a4bb
This adds 3 Mikrotik rb4xx series drivers as follows: rb4xx-cpld: This is in the mfd subsystem, and is the parent CPLD device that interfaces between the SoC SPI bus and its two children below. rb4xx-gpio: This is the GPIO expander. rb4xx-nand: This is the NAND driver. The history of this code comes in three phases. 1. The first is a May 2015 attempt to push the equivalient ar71xx rb4xx drivers upstream. See https://lore.kernel.org/patchwork/patch/940880/. Module-author: Gabor Juhos <juhosg@openwrt.org> Module-author: Imre Kaloz <kaloz@openwrt.org> Module-author: Bert Vermeulen <bert@biot.com> 2. Next several ar71xx patches were applied bringing the code current. commit7bbf4117c6Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de> commitaf79fdbe4acommit889272d92dcommite21cb649a2commit7c09fa4a74Signed-off-by: Felix Fietkau <nbd@nbd.name> 3. Finally a heavy refactor to split the driver into the three new subsystems, and updated to work with the device tree configuration, plus updates and review feedback incorporated Reviewed-by: Thibaut VARÈNE <hacks@slashdirt.org> Signed-off-by: Christopher Hill <ch6574@gmail.com>
26 lines
813 B
C
26 lines
813 B
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* CPLD driver for the MikroTik RouterBoard 4xx series
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*
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* Copyright (C) 2008-2011 Gabor Juhos <juhosg@openwrt.org>
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* Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
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* Copyright (C) 2015 Bert Vermeulen <bert@biot.com>
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* Copyright (C) 2020 Christopher Hill <ch6574@gmail.com>
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*
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* This file was based on the driver for Linux 2.6.22 published by
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* MikroTik for their RouterBoard 4xx series devices.
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*/
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#include <linux/spi/spi.h>
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struct rb4xx_cpld {
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struct spi_device *spi;
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int (*write_nand)(struct rb4xx_cpld *self, const void *tx_buf,
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unsigned int len);
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int (*read_nand)(struct rb4xx_cpld *self, void *rx_buf,
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unsigned int len);
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int (*gpio_set_0_7)(struct rb4xx_cpld *self, u8 values);
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int (*gpio_set_8)(struct rb4xx_cpld *self, u8 value);
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};
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