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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>
5.4-rM2-2.2.x-imx-squashed
Fugang Duan 2019-07-10 14:20:45 +08:00 committed by Dong Aisheng
parent 8ee7d8348e
commit db08d5739e
1 changed files with 54 additions and 0 deletions
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54
drivers/tty/serial/fsl_lpuart.c
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@ -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>
@ -2368,6 +2370,54 @@ 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,
@ -2418,6 +2468,10 @@ static int lpuart_probe(struct platform_device *pdev)
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);