[PATCH v4 3/4] drivers/tty/serial/8250: add aspeed,lpc-io-reg and aspeed,lpc-interrupts DT properties

Zev Weiss
2021-04-02T18:27:48Z

These allow describing all the Aspeed VUART attributes currently
available via sysfs. aspeed,sirq provides a replacement for the
deprecated aspeed,sirq-polarity-sense property.

Signed-off-by: Zev Weiss <zev@bewilderbeest.net>
---
drivers/tty/serial/8250/8250_aspeed_vuart.c | 44 ++++++++++++++++++++-
1 file changed, 43 insertions(+), 1 deletion(-)

diff --git a/drivers/tty/serial/8250/8250_aspeed_vuart.c b/drivers/tty/serial/8250/8250_aspeed_vuart.c
index 8433f8dbb186..75ef006fa24b 100644
--- a/drivers/tty/serial/8250/8250_aspeed_vuart.c
+++ b/drivers/tty/serial/8250/8250_aspeed_vuart.c
@@ -28,6 +28,10 @@
#define ASPEED_VUART_ADDRL 0x28
#define ASPEED_VUART_ADDRH 0x2c

+#define ASPEED_VUART_DEFAULT_LPC_ADDR 0x3f8
+#define ASPEED_VUART_DEFAULT_SIRQ 4
+#define ASPEED_VUART_DEFAULT_SIRQ_POLARITY IRQ_TYPE_LEVEL_LOW
+
struct aspeed_vuart {
struct device *dev;
void __iomem *regs;
@@ -393,7 +397,8 @@ static int aspeed_vuart_probe(struct platform_device *pdev)
struct aspeed_vuart *vuart;
struct device_node *np;
struct resource *res;
- u32 clk, prop;
+ u32 clk, prop, sirq[2];
+ bool sirq_polarity;
int rc;

np = pdev->dev.of_node;
@@ -501,6 +506,43 @@ static int aspeed_vuart_probe(struct platform_device *pdev)
of_node_put(sirq_polarity_sense_args.np);
}

+ rc = of_property_read_u32(np, "aspeed,lpc-io-reg", &prop);
+ if (rc < 0)
+ prop = ASPEED_VUART_DEFAULT_LPC_ADDR;
+
+ rc = aspeed_vuart_set_lpc_address(vuart, prop);
+ if (rc < 0) {
+ dev_err(&pdev->dev, "invalid value in aspeed,lpc-io-reg property\n");
+ goto err_clk_disable;
+ }
+
+ rc = of_property_read_u32_array(np, "aspeed,lpc-interrupts", sirq, 2);
+ if (rc < 0) {
+ sirq[0] = ASPEED_VUART_DEFAULT_SIRQ;
+ sirq[1] = ASPEED_VUART_DEFAULT_SIRQ_POLARITY;
+ }
+
+ rc = aspeed_vuart_set_sirq(vuart, sirq[0]);
+ if (rc < 0) {
+ dev_err(&pdev->dev, "invalid sirq number in aspeed,lpc-interrupts property\n");
+ goto err_clk_disable;
+ }
+
+ switch (sirq[1]) {
+ case IRQ_TYPE_LEVEL_LOW:
+ sirq_polarity = false;
+ break;
+ case IRQ_TYPE_LEVEL_HIGH:
+ sirq_polarity = true;
+ break;
+ default:
+ dev_err(&pdev->dev, "invalid sirq polarity in aspeed,lpc-interrupts property\n");
+ rc = -EINVAL;
+ goto err_clk_disable;
+ }
+
+ aspeed_vuart_set_sirq_polarity(vuart, sirq_polarity);
+
aspeed_vuart_set_enabled(vuart, true);
aspeed_vuart_set_host_tx_discard(vuart, true);
platform_set_drvdata(pdev, vuart);
--
2.31.1