diff options
Diffstat (limited to 'target/linux/layerscape/patches-5.4/819-uart-0001-tty-serial-lpuart-add-power-domain-support.patch')
| -rw-r--r-- | target/linux/layerscape/patches-5.4/819-uart-0001-tty-serial-lpuart-add-power-domain-support.patch | 95 |
1 files changed, 95 insertions, 0 deletions
diff --git a/target/linux/layerscape/patches-5.4/819-uart-0001-tty-serial-lpuart-add-power-domain-support.patch b/target/linux/layerscape/patches-5.4/819-uart-0001-tty-serial-lpuart-add-power-domain-support.patch new file mode 100644 index 0000000000..bad4128bf5 --- /dev/null +++ b/target/linux/layerscape/patches-5.4/819-uart-0001-tty-serial-lpuart-add-power-domain-support.patch @@ -0,0 +1,95 @@ +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); |