djsundog/sharp-drm-driver-radxa-zero
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chore: drop manual SPI Chip Select management

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the screen works fine without this because the SPI kernel
handling does chip selection for us
This commit is contained in:
James Ward 2023-07-11 03:00:56 -04:00
parent 6ef6fd88a5
commit d90237bf9a
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GPG Key ID: F53FE2DEDD7BBD79
2 changed files with 0 additions and 38 deletions
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37
drm_iface.c
View File

@ -35,10 +35,6 @@
#include "indicators.h"
#define GPIO_DISP 22
#define GPIO_SCS 8
#define GPIO_VCOM 23
#define CMD_WRITE_LINE 0b10000000
#define CMD_CLEAR_SCREEN 0b00100000
@ -62,7 +58,6 @@ struct sharp_memory_panel {
char indicators[MAX_INDICATORS];
struct gpio_desc *gpio_scs;
struct gpio_desc *gpio_disp;
struct gpio_desc *gpio_vcom;
};
@ -103,18 +98,8 @@ static int sharp_memory_spi_clear_screen(struct sharp_memory_panel *panel)
// Write clear screen command
ndelay(80);
if (panel->gpio_scs)
{
gpiod_set_value(panel->gpio_scs, 1);
}
rc = spi_sync_transfer(panel->spi, panel->spi_3_xfers, 2);
if (panel->gpio_scs)
{
gpiod_set_value(panel->gpio_scs, 0);
}
return rc;
}
@ -147,18 +132,8 @@ static int sharp_memory_spi_write_tagged_lines(struct sharp_memory_panel *panel,
ndelay(80);
if (panel->gpio_scs)
{
gpiod_set_value(panel->gpio_scs, 1);
}
rc = spi_sync_transfer(panel->spi, panel->spi_3_xfers, 3);
if (panel->gpio_scs)
{
gpiod_set_value(panel->gpio_scs, 0);
}
return rc;
}
@ -353,10 +328,6 @@ static void power_off(struct sharp_memory_panel *panel)
printk(KERN_INFO "sharp_memory: powering off\n");
/* Turn off power and all signals */
if (panel->gpio_scs)
{
gpiod_set_value(panel->gpio_scs, 0);
}
gpiod_set_value(panel->gpio_disp, 0);
gpiod_set_value(panel->gpio_vcom, 0);
}
@ -537,10 +508,6 @@ int drm_probe(struct spi_device *spi)
g_panel = panel;
// Initialize GPIO
panel->gpio_scs = devm_gpiod_get_optional(dev, "scs", GPIOD_OUT_LOW);
if (IS_ERR(panel->gpio_scs))
return dev_err_probe(dev, PTR_ERR(panel->gpio_scs), "Failed to get GPIO 'scs'\n");
panel->gpio_disp = devm_gpiod_get(dev, "disp", GPIOD_OUT_HIGH);
if (IS_ERR(panel->gpio_disp))
return dev_err_probe(dev, PTR_ERR(panel->gpio_disp), "Failed to get GPIO 'disp'\n");
@ -633,10 +600,6 @@ void drm_remove(struct spi_device *spi)
dev = &spi->dev;
panel = drm_to_panel(drm)
if (panel->gpio_scs)
{
devm_gpiod_put(dev, panel->gpio_scs);
}
devm_gpiod_put(dev, panel->gpio_disp);
devm_gpiod_put(dev, panel->gpio_vcom);

1
sharp.dts
View File

@ -51,7 +51,6 @@
vcom-gpios = <&gpio 23 0>;
disp-gpios = <&gpio 22 0>;
scs-gpios = <&gpio 8 0>;
spi-cs-high = <1>;
spi-max-frequency = <8000000>;