1 // SPDX-License-Identifier: GPL-2.0+
33 #define ILI9486_MADCTL_BGR      BIT(3)
34 #define ILI9486_MADCTL_MV       BIT(5)
35 #define ILI9486_MADCTL_MX       BIT(6)
36 #define ILI9486_MADCTL_MY       BIT(7)
39  * The PiScreen/waveshare rpi-lcd-35 has a SPI to 16-bit parallel bus converter
40  * in front of the  display controller. This means that 8-bit values have to be
41  * transferred as 16-bit.
46 	struct spi_device *spi = mipi->spi;  in waveshare_command()
55 		return -ENOMEM;  in waveshare_command()
58 	 * The displays are Raspberry Pi HATs and connected to the 8-bit only  in waveshare_command()
59 	 * SPI controller, so 16-bit command and parameters need byte swapping  in waveshare_command()
60 	 * before being transferred as 8-bit on the big endian SPI bus.  in waveshare_command()
63 	spi_bus_lock(spi->controller);  in waveshare_command()
64 	gpiod_set_value_cansleep(mipi->dc, 0);  in waveshare_command()
65 	speed_hz = mipi_dbi_spi_cmd_max_speed(spi, 2);  in waveshare_command()
66 	ret = mipi_dbi_spi_transfer(spi, speed_hz, 8, buf, 2);  in waveshare_command()
67 	spi_bus_unlock(spi->controller);  in waveshare_command()
71 	/* 8-bit configuration data, not 16-bit pixel data */  in waveshare_command()
75 		num *= 2;  in waveshare_command()
82 	if (*cmd == MIPI_DCS_WRITE_MEMORY_START && !mipi->swap_bytes)  in waveshare_command()
85 	spi_bus_lock(spi->controller);  in waveshare_command()
86 	gpiod_set_value_cansleep(mipi->dc, 1);  in waveshare_command()
89 	spi_bus_unlock(spi->controller);  in waveshare_command()
100 	struct mipi_dbi_dev *dbidev = drm_to_mipi_dbi_dev(pipe->crtc.dev);  in waveshare_enable()
101 	struct mipi_dbi *dbi = &dbidev->dbi;  in waveshare_enable()
105 	if (!drm_dev_enter(pipe->crtc.dev, &idx))  in waveshare_enable()
130 			 0x0F, 0x32, 0x2E, 0x0B, 0x0D, 0x05, 0x47, 0x75,  in waveshare_enable()
133 			 0x0F, 0x32, 0x2E, 0x0B, 0x0D, 0x05, 0x47, 0x75,  in waveshare_enable()
140 	switch (dbidev->rotation) {  in waveshare_enable()
185 	{ .compatible = "waveshare,rpi-lcd-35" },
193 	{ "rpi-lcd-35", 0 },
201 	struct device *dev = &spi->dev;  in ili9486_probe()
214 	dbi = &dbidev->dbi;  in ili9486_probe()
215 	drm = &dbidev->drm;  in ili9486_probe()
217 	dbi->reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);  in ili9486_probe()
218 	if (IS_ERR(dbi->reset))  in ili9486_probe()
219 		return dev_err_probe(dev, PTR_ERR(dbi->reset), "Failed to get GPIO 'reset'\n");  in ili9486_probe()
225 	dbidev->backlight = devm_of_find_backlight(dev);  in ili9486_probe()
226 	if (IS_ERR(dbidev->backlight))  in ili9486_probe()
227 		return PTR_ERR(dbidev->backlight);  in ili9486_probe()
235 	dbi->command = waveshare_command;  in ili9486_probe()
236 	dbi->read_commands = NULL;  in ili9486_probe()