96 lines
2.7 KiB
Diff
96 lines
2.7 KiB
Diff
From e8730a6bd02cf4f6a3e2d11585d91c0417ed92e5 Mon Sep 17 00:00:00 2001
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From: Fugang Duan <fugang.duan@nxp.com>
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Date: Wed, 10 Jul 2019 14:20:45 +0800
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Subject: [PATCH] tty: serial: lpuart: add power domain support
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lpuart dma mode depends on dma channel's power domain like:
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power-domains = <&pd IMX_SC_R_UART_1>,
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<&pd IMX_SC_R_DMA_2_CH10>,
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<&pd IMX_SC_R_DMA_2_CH11>;
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power-domain-names = "uart", "rxdma", "txdma";
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So define the multiple power domain for lpuart.
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Signed-off-by: Fugang Duan <fugang.duan@nxp.com>
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---
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drivers/tty/serial/fsl_lpuart.c | 54 +++++++++++++++++++++++++++++++++++++++++
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1 file changed, 54 insertions(+)
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--- a/drivers/tty/serial/fsl_lpuart.c
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+++ b/drivers/tty/serial/fsl_lpuart.c
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@@ -20,6 +20,8 @@
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/of_dma.h>
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+#include <linux/pm_domain.h>
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+#include <linux/pm_runtime.h>
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#include <linux/serial_core.h>
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#include <linux/slab.h>
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#include <linux/tty_flip.h>
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@@ -2420,6 +2422,54 @@ static struct uart_driver lpuart_reg = {
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.cons = LPUART_CONSOLE,
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};
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+static int lpuart_attach_pd(struct device *dev)
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+{
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+ struct device *pd_uart;
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+ struct device *pd_txdma, *pd_rxdma;
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+ struct device_link *link;
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+
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+ if (dev->pm_domain)
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+ return 0;
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+
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+ pd_uart = dev_pm_domain_attach_by_name(dev, "uart");
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+ if (IS_ERR(pd_uart))
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+ return PTR_ERR(pd_uart);
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+ link = device_link_add(dev, pd_uart, DL_FLAG_STATELESS |
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+ DL_FLAG_PM_RUNTIME |
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+ DL_FLAG_RPM_ACTIVE);
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+ if (IS_ERR(link)) {
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+ dev_err(dev, "Failed to add device_link to uart pd: %ld\n",
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+ PTR_ERR(link));
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+ return PTR_ERR(link);
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+ }
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+
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+ pd_txdma = dev_pm_domain_attach_by_name(dev, "txdma");
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+ if (IS_ERR(pd_txdma))
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+ return PTR_ERR(pd_txdma);
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+ link = device_link_add(dev, pd_txdma, DL_FLAG_STATELESS |
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+ DL_FLAG_PM_RUNTIME |
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+ DL_FLAG_RPM_ACTIVE);
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+ if (IS_ERR(link)) {
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+ dev_err(dev, "Failed to add device_link to uart pd: %ld\n",
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+ PTR_ERR(link));
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+ return PTR_ERR(link);
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+ }
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+
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+ pd_rxdma = dev_pm_domain_attach_by_name(dev, "rxdma");
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+ if (IS_ERR(pd_rxdma))
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+ return PTR_ERR(pd_rxdma);
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+ link = device_link_add(dev, pd_rxdma, DL_FLAG_STATELESS |
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+ DL_FLAG_PM_RUNTIME |
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+ DL_FLAG_RPM_ACTIVE);
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+ if (IS_ERR(link)) {
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+ dev_err(dev, "Failed to add device_link to uart pd: %ld\n",
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+ PTR_ERR(link));
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+ return PTR_ERR(link);
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+ }
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+
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+ return 0;
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+}
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+
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static int lpuart_probe(struct platform_device *pdev)
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{
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const struct of_device_id *of_id = of_match_device(lpuart_dt_ids,
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@@ -2457,6 +2507,10 @@ static int lpuart_probe(struct platform_
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sport->port.rs485_config = lpuart_config_rs485;
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+ ret = lpuart_attach_pd(&pdev->dev);
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+ if (ret)
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+ return ret;
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+
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sport->ipg_clk = devm_clk_get(&pdev->dev, "ipg");
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if (IS_ERR(sport->ipg_clk)) {
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ret = PTR_ERR(sport->ipg_clk);
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