forked from luck/tmp_suning_uos_patched
8818e865aa
The "Display Engine 2.0" (usually called DE2) on the Allwinner A64 SoC is different from the ones on other Allwinner SoCs. It requires a SRAM region to be claimed, otherwise all DE2 subblocks won't be accessible. Add a bus driver for the Allwinner A64 DE2 part which claims the SRAM region when probing. Signed-off-by: Icenowy Zheng <icenowy@aosc.io> Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>
49 lines
1.1 KiB
C
49 lines
1.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Allwinner A64 Display Engine 2.0 Bus Driver
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*
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* Copyright (C) 2018 Icenowy Zheng <icenowy@aosc.io>
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*/
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#include <linux/of_platform.h>
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#include <linux/platform_device.h>
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#include <linux/soc/sunxi/sunxi_sram.h>
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static int sun50i_de2_bus_probe(struct platform_device *pdev)
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{
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struct device_node *np = pdev->dev.of_node;
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int ret;
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ret = sunxi_sram_claim(&pdev->dev);
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if (ret) {
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dev_err(&pdev->dev, "Error couldn't map SRAM to device\n");
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return ret;
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}
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of_platform_populate(np, NULL, NULL, &pdev->dev);
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return 0;
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}
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static int sun50i_de2_bus_remove(struct platform_device *pdev)
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{
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sunxi_sram_release(&pdev->dev);
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return 0;
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}
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static const struct of_device_id sun50i_de2_bus_of_match[] = {
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{ .compatible = "allwinner,sun50i-a64-de2", },
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{ /* sentinel */ }
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};
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static struct platform_driver sun50i_de2_bus_driver = {
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.probe = sun50i_de2_bus_probe,
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.remove = sun50i_de2_bus_remove,
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.driver = {
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.name = "sun50i-de2-bus",
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.of_match_table = sun50i_de2_bus_of_match,
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},
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};
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builtin_platform_driver(sun50i_de2_bus_driver);
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