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From e8730a6bd02cf4f6a3e2d11585d91c0417ed92e5 Mon Sep 17 00:00:00 2001
From: Fugang Duan <fugang.duan@nxp.com>
Date: Wed, 10 Jul 2019 14:20:45 +0800
Subject: [PATCH] tty: serial: lpuart: add power domain support
lpuart dma mode depends on dma channel's power domain like:
power-domains = <&pd IMX_SC_R_UART_1>,
<&pd IMX_SC_R_DMA_2_CH10>,
<&pd IMX_SC_R_DMA_2_CH11>;
power-domain-names = "uart", "rxdma", "txdma";
So define the multiple power domain for lpuart.
Signed-off-by: Fugang Duan <fugang.duan@nxp.com>
---
drivers/tty/serial/fsl_lpuart.c | 54 +++++++++++++++++++++++++++++++++++++++++
1 file changed, 54 insertions(+)
--- a/drivers/tty/serial/fsl_lpuart.c
+++ b/drivers/tty/serial/fsl_lpuart.c
@@ -20,6 +20,8 @@
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/of_dma.h>
+#include <linux/pm_domain.h>
+#include <linux/pm_runtime.h>
#include <linux/serial_core.h>
#include <linux/slab.h>
#include <linux/tty_flip.h>
@@ -2369,6 +2371,54 @@ static struct uart_driver lpuart_reg = {
.cons = LPUART_CONSOLE,
};
+static int lpuart_attach_pd(struct device *dev)
+{
+ struct device *pd_uart;
+ struct device *pd_txdma, *pd_rxdma;
+ struct device_link *link;
+
+ if (dev->pm_domain)
+ return 0;
+
+ pd_uart = dev_pm_domain_attach_by_name(dev, "uart");
+ if (IS_ERR(pd_uart))
+ return PTR_ERR(pd_uart);
+ link = device_link_add(dev, pd_uart, DL_FLAG_STATELESS |
+ DL_FLAG_PM_RUNTIME |
+ DL_FLAG_RPM_ACTIVE);
+ if (IS_ERR(link)) {
+ dev_err(dev, "Failed to add device_link to uart pd: %ld\n",
+ PTR_ERR(link));
+ return PTR_ERR(link);
+ }
+
+ pd_txdma = dev_pm_domain_attach_by_name(dev, "txdma");
+ if (IS_ERR(pd_txdma))
+ return PTR_ERR(pd_txdma);
+ link = device_link_add(dev, pd_txdma, DL_FLAG_STATELESS |
+ DL_FLAG_PM_RUNTIME |
+ DL_FLAG_RPM_ACTIVE);
+ if (IS_ERR(link)) {
+ dev_err(dev, "Failed to add device_link to uart pd: %ld\n",
+ PTR_ERR(link));
+ return PTR_ERR(link);
+ }
+
+ pd_rxdma = dev_pm_domain_attach_by_name(dev, "rxdma");
+ if (IS_ERR(pd_rxdma))
+ return PTR_ERR(pd_rxdma);
+ link = device_link_add(dev, pd_rxdma, DL_FLAG_STATELESS |
+ DL_FLAG_PM_RUNTIME |
+ DL_FLAG_RPM_ACTIVE);
+ if (IS_ERR(link)) {
+ dev_err(dev, "Failed to add device_link to uart pd: %ld\n",
+ PTR_ERR(link));
+ return PTR_ERR(link);
+ }
+
+ return 0;
+}
+
static int lpuart_probe(struct platform_device *pdev)
{
const struct of_device_id *of_id = of_match_device(lpuart_dt_ids,
@@ -2406,6 +2456,10 @@ static int lpuart_probe(struct platform_
sport->port.rs485_config = lpuart_config_rs485;
+ ret = lpuart_attach_pd(&pdev->dev);
+ if (ret)
+ return ret;
+
sport->ipg_clk = devm_clk_get(&pdev->dev, "ipg");
if (IS_ERR(sport->ipg_clk)) {
ret = PTR_ERR(sport->ipg_clk);
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