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ath79: add support for Atheros AR934x HS UART

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AR934x chips also got the 'old' qca,ar9330-uart in addition to the
'new' ns16550a compatible one. Add support for UART1 clock selector as
well as device-tree bindings in ar934x.dtsi to make use of that uart.

Reported-by: Piotr Dymacz <pepe2k@gmail.com>
Signed-off-by: Daniel Golle <daniel@makrotopia.org>
This commit is contained in:
Daniel Golle 2020-02-02 18:02:11 +02:00
parent b439d3bfb5
commit 16031ebaf8
2 changed files with 65 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
target/linux/ath79/dts/ar934x.dtsi
View File

@ -133,6 +133,19 @@
#reset-cells = <1>; #reset-cells = <1>;
}; };
hs_uart: uart@18500000 {
compatible = "qca,ar9330-uart";
reg = <0x18500000 0x14>;
interrupts = <6>;
interrupt-parent = <&miscintc>;
clocks = <&pll ATH79_CLK_UART1>;
clock-names = "uart";
status = "disabled";
};
}; };
nand: nand@1b000200 { nand: nand@1b000200 {

52
target/linux/ath79/patches-4.19/0039-MIPS-ath79-export-UART1-reference-clock.patch Normal file
View File

@ -0,0 +1,52 @@
--- a/arch/mips/ath79/clock.c
+++ b/arch/mips/ath79/clock.c
@@ -42,6 +42,7 @@ static const char * const clk_names[ATH7
[ATH79_CLK_AHB] = "ahb",
[ATH79_CLK_REF] = "ref",
[ATH79_CLK_MDIO] = "mdio",
+ [ATH79_CLK_UART1] = "uart1",
};
static const char * __init ath79_clk_name(int type)
@@ -346,6 +347,9 @@ static void __init ar934x_clocks_init(vo
if (clk_ctrl & AR934X_PLL_SWITCH_CLOCK_CONTROL_MDIO_CLK_SEL)
ath79_set_clk(ATH79_CLK_MDIO, 100 * 1000 * 1000);
+ if (clk_ctrl & AR934X_PLL_SWITCH_CLOCK_CONTROL_UART1_CLK_SEL)
+ ath79_set_clk(ATH79_CLK_UART1, 100 * 1000 * 1000);
+
iounmap(dpll_base);
}
@@ -651,6 +655,9 @@ static void __init ath79_clocks_init_dt(
if (!clks[ATH79_CLK_MDIO])
clks[ATH79_CLK_MDIO] = clks[ATH79_CLK_REF];
+ if (!clks[ATH79_CLK_UART1])
+ clks[ATH79_CLK_UART1] = clks[ATH79_CLK_REF];
+
if (of_clk_add_provider(np, of_clk_src_onecell_get, &clk_data)) {
pr_err("%pOF: could not register clk provider\n", np);
goto err_iounmap;
--- a/arch/mips/include/asm/mach-ath79/ar71xx_regs.h
+++ b/arch/mips/include/asm/mach-ath79/ar71xx_regs.h
@@ -351,6 +351,7 @@
#define AR934X_PLL_CPU_DDR_CLK_CTRL_AHBCLK_FROM_DDRPLL BIT(24)
#define AR934X_PLL_SWITCH_CLOCK_CONTROL_MDIO_CLK_SEL BIT(6)
+#define AR934X_PLL_SWITCH_CLOCK_CONTROL_UART1_CLK_SEL BIT(7)
#define QCA953X_PLL_CPU_CONFIG_REG 0x00
#define QCA953X_PLL_DDR_CONFIG_REG 0x04
--- a/include/dt-bindings/clock/ath79-clk.h
+++ b/include/dt-bindings/clock/ath79-clk.h
@@ -15,7 +15,8 @@
#define ATH79_CLK_AHB 2
#define ATH79_CLK_REF 3
#define ATH79_CLK_MDIO 4
+#define ATH79_CLK_UART1 5
-#define ATH79_CLK_END 5
+#define ATH79_CLK_END 6
#endif /* __DT_BINDINGS_ATH79_CLK_H */