Add support to read RK3308 registers used to configure UART clocks, and thus to get UART rate and baudrate. This fixes clock_get_rate returning error on serial device probing. Moreover, there is no need anymore to use 'clock-frequency' property for UART nodes in *-u-boot.dtsi files for all cases where UART is not inited by U-Boot proper or by SPL o by TPL code but by a preliminary external boot phase (for Rock PI S, UART is inited by external TPL).
Signed-off-by: Massimo Pegorer massimo.pegorer+oss@gmail.com --- arch/arm/dts/rk3308-rock-pi-s-u-boot.dtsi | 2 - arch/arm/include/asm/arch-rk3308/cru_rk3308.h | 15 +++++ drivers/clk/rockchip/clk_rk3308.c | 59 +++++++++++++++++++ 3 files changed, 74 insertions(+), 2 deletions(-)
diff --git a/arch/arm/dts/rk3308-rock-pi-s-u-boot.dtsi b/arch/arm/dts/rk3308-rock-pi-s-u-boot.dtsi index 09694b41e5..61415559b7 100644 --- a/arch/arm/dts/rk3308-rock-pi-s-u-boot.dtsi +++ b/arch/arm/dts/rk3308-rock-pi-s-u-boot.dtsi @@ -12,6 +12,4 @@
&uart0 { bootph-all; - clock-frequency = <24000000>; - status = "okay"; }; diff --git a/arch/arm/include/asm/arch-rk3308/cru_rk3308.h b/arch/arm/include/asm/arch-rk3308/cru_rk3308.h index 86c906bb0e..84b63e4d56 100644 --- a/arch/arm/include/asm/arch-rk3308/cru_rk3308.h +++ b/arch/arm/include/asm/arch-rk3308/cru_rk3308.h @@ -189,6 +189,21 @@ enum { DCLK_VOP_DIV_SHIFT = 0, DCLK_VOP_DIV_MASK = 0xff,
+ /* CRU_CLKSEL_CON10 */ + /* CRU_CLKSEL_CON13 */ + /* CRU_CLKSEL_CON16 */ + /* CRU_CLKSEL_CON19 */ + /* CRU_CLKSEL_CON22 */ + CLK_UART_PLL_SEL_SHIFT = 13, + CLK_UART_PLL_SEL_MASK = 0x7 << CLK_UART_PLL_SEL_SHIFT, + CLK_UART_PLL_SEL_DPLL = 0, + CLK_UART_PLL_SEL_VPLL0, + CLK_UART_PLL_SEL_VPLL1, + CLK_UART_PLL_SEL_480M, + CLK_UART_PLL_SEL_24M, + CLK_UART_DIV_CON_SHIFT = 0, + CLK_UART_DIV_CON_MASK = 0x1f << CLK_UART_DIV_CON_SHIFT, + /* CRU_CLK_SEL25_CON */ /* CRU_CLK_SEL26_CON */ /* CRU_CLK_SEL27_CON */ diff --git a/drivers/clk/rockchip/clk_rk3308.c b/drivers/clk/rockchip/clk_rk3308.c index d27673c454..d0a3f65446 100644 --- a/drivers/clk/rockchip/clk_rk3308.c +++ b/drivers/clk/rockchip/clk_rk3308.c @@ -451,6 +451,58 @@ static ulong rk3308_pwm_set_clk(struct clk *clk, uint hz) return rk3308_pwm_get_clk(clk); }
+static ulong rk3308_uart_get_clk(struct clk *clk) +{ + struct rk3308_clk_priv *priv = dev_get_priv(clk->dev); + struct rk3308_cru *cru = priv->cru; + u32 div, pll_sel, con, con_id, parent; + + switch (clk->id) { + case SCLK_UART0: + con_id = 10; + break; + case SCLK_UART1: + con_id = 13; + break; + case SCLK_UART2: + con_id = 16; + break; + case SCLK_UART3: + con_id = 19; + break; + case SCLK_UART4: + con_id = 22; + break; + default: + printf("do not support this uart interface\n"); + return -EINVAL; + } + + con = readl(&cru->clksel_con[con_id]); + pll_sel = (con & CLK_UART_PLL_SEL_MASK) >> CLK_UART_PLL_SEL_SHIFT; + div = (con & CLK_UART_DIV_CON_MASK) >> CLK_UART_DIV_CON_SHIFT; + + switch (pll_sel) { + case CLK_UART_PLL_SEL_DPLL: + parent = priv->dpll_hz; + break; + case CLK_UART_PLL_SEL_VPLL0: + parent = priv->vpll0_hz; + break; + case CLK_UART_PLL_SEL_VPLL1: + parent = priv->vpll0_hz; + break; + case CLK_UART_PLL_SEL_24M: + parent = OSC_HZ; + break; + default: + printf("do not support this uart pll sel\n"); + return -EINVAL; + } + + return DIV_TO_RATE(parent, div); +} + static ulong rk3308_vop_get_clk(struct clk *clk) { struct rk3308_clk_priv *priv = dev_get_priv(clk->dev); @@ -813,6 +865,13 @@ static ulong rk3308_clk_get_rate(struct clk *clk) case SCLK_EMMC_SAMPLE: rate = rk3308_mmc_get_clk(clk); break; + case SCLK_UART0: + case SCLK_UART1: + case SCLK_UART2: + case SCLK_UART3: + case SCLK_UART4: + rate = rk3308_uart_get_clk(clk); + break; case SCLK_I2C0: case SCLK_I2C1: case SCLK_I2C2: