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[3/4] leds: bcm63128: Handle shift register config

Message ID 20240920-bcm63138-leds-v1-3-c150871324a0@linaro.org
State New
Headers show
Series [1/4] dt-bindings: leds: bcm63128: Add shift register bits | expand

Commit Message

Linus Walleij Sept. 20, 2024, 9:59 p.m. UTC 
This adds code to optionally read the width of the shift register
chain from the device tree and use it to set up the register
controlling the shifter hardware.

If the property is not present, the boot-time default is used so
existing device trees keep working as this is what they assume.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---
 drivers/leds/blink/leds-bcm63138.c | 8 ++++++++
 1 file changed, 8 insertions(+)
diff mbox series

Patch

diff --git a/drivers/leds/blink/leds-bcm63138.c b/drivers/leds/blink/leds-bcm63138.c
index 374f68f4f277..bf170a5bb12a 100644
--- a/drivers/leds/blink/leds-bcm63138.c
+++ b/drivers/leds/blink/leds-bcm63138.c
@@ -2,6 +2,7 @@ 
 /*
  * Copyright (C) 2021 Rafał Miłecki <rafal@milecki.pl>
  */
+#include <linux/bits.h>
 #include <linux/cleanup.h>
 #include <linux/delay.h>
 #include <linux/io.h>
@@ -254,6 +255,7 @@  static int bcm63138_leds_probe(struct platform_device *pdev)
 	struct device_node *np = dev_of_node(&pdev->dev);
 	struct device *dev = &pdev->dev;
 	struct bcm63138_leds *leds;
+	u32 shift_bits;
 
 	leds = devm_kzalloc(dev, sizeof(*leds), GFP_KERNEL);
 	if (!leds)
@@ -267,6 +269,12 @@  static int bcm63138_leds_probe(struct platform_device *pdev)
 
 	spin_lock_init(&leds->lock);
 
+	/* If this property is not present, we use boot defaults */
+	if (!of_property_read_u32(np, "brcm,serial-shift-bits", &shift_bits)) {
+		bcm63138_leds_write(leds, BCM63138_SERIAL_LED_SHIFT_SEL,
+				    GENMASK(32 - shift_bits - 1, 0));
+	}
+
 	bcm63138_leds_write(leds, BCM63138_GLB_CTRL,
 			    BCM63138_GLB_CTRL_SERIAL_LED_DATA_PPOL |
 			    BCM63138_GLB_CTRL_SERIAL_LED_EN_POL);