diff options
Diffstat (limited to 'target/linux/ath79/patches-4.14/0031-MIPS-ath79-make-specifying-the-reference-clock-in-DT.patch')
| -rw-r--r-- | target/linux/ath79/patches-4.14/0031-MIPS-ath79-make-specifying-the-reference-clock-in-DT.patch | 225 |
1 files changed, 225 insertions, 0 deletions
diff --git a/target/linux/ath79/patches-4.14/0031-MIPS-ath79-make-specifying-the-reference-clock-in-DT.patch b/target/linux/ath79/patches-4.14/0031-MIPS-ath79-make-specifying-the-reference-clock-in-DT.patch new file mode 100644 index 0000000..9cadc02 --- /dev/null +++ b/target/linux/ath79/patches-4.14/0031-MIPS-ath79-make-specifying-the-reference-clock-in-DT.patch @@ -0,0 +1,225 @@ +From: Felix Fietkau <nbd@nbd.name> +Date: Tue, 6 Mar 2018 13:24:07 +0100 +Subject: [PATCH] MIPS: ath79: make specifying the reference clock in DT + optional + +It can be autodetected for many SoCs using the strapping options. +If the clock is specified in DT, the autodetected value is ignored + +Signed-off-by: Felix Fietkau <nbd@nbd.name> +--- + +--- a/arch/mips/ath79/clock.c ++++ b/arch/mips/ath79/clock.c +@@ -79,6 +79,18 @@ static struct clk * __init ath79_set_ff_ + return clk; + } + ++static unsigned long __init ath79_setup_ref_clk(unsigned long rate) ++{ ++ struct clk *clk = clks[ATH79_CLK_REF]; ++ ++ if (clk) ++ rate = clk_get_rate(clk); ++ else ++ clk = ath79_set_clk(ATH79_CLK_REF, rate); ++ ++ return rate; ++} ++ + static void __init ar71xx_clocks_init(void __iomem *pll_base) + { + unsigned long ref_rate; +@@ -89,7 +101,7 @@ static void __init ar71xx_clocks_init(vo + u32 freq; + u32 div; + +- ref_rate = AR71XX_BASE_FREQ; ++ ref_rate = ath79_setup_ref_clk(AR71XX_BASE_FREQ); + + pll = __raw_readl(pll_base + AR71XX_PLL_REG_CPU_CONFIG); + +@@ -105,16 +117,17 @@ static void __init ar71xx_clocks_init(vo + div = (((pll >> AR71XX_AHB_DIV_SHIFT) & AR71XX_AHB_DIV_MASK) + 1) * 2; + ahb_rate = cpu_rate / div; + +- ath79_set_clk(ATH79_CLK_REF, ref_rate); + ath79_set_clk(ATH79_CLK_CPU, cpu_rate); + ath79_set_clk(ATH79_CLK_DDR, ddr_rate); + ath79_set_clk(ATH79_CLK_AHB, ahb_rate); + } + +-static void __init ar724x_clk_init(struct clk *ref_clk, void __iomem *pll_base) ++static void __init ar724x_clocks_init(void __iomem *pll_base) + { +- u32 pll; + u32 mult, div, ddr_div, ahb_div; ++ u32 pll; ++ ++ ath79_setup_ref_clk(AR71XX_BASE_FREQ); + + pll = __raw_readl(pll_base + AR724X_PLL_REG_CPU_CONFIG); + +@@ -129,17 +142,9 @@ static void __init ar724x_clk_init(struc + ath79_set_ff_clk(ATH79_CLK_AHB, "ref", mult, div * ahb_div); + } + +-static void __init ar724x_clocks_init(void __iomem *pll_base) +-{ +- struct clk *ref_clk; +- +- ref_clk = ath79_set_clk(ATH79_CLK_REF, AR724X_BASE_FREQ); +- +- ar724x_clk_init(ref_clk, pll_base); +-} +- +-static void __init ar9330_clk_init(struct clk *ref_clk, void __iomem *pll_base) ++static void __init ar933x_clocks_init(void __iomem *pll_base) + { ++ unsigned long ref_rate; + u32 clock_ctrl; + u32 ref_div; + u32 ninit_mul; +@@ -148,6 +153,15 @@ static void __init ar9330_clk_init(struc + u32 cpu_div; + u32 ddr_div; + u32 ahb_div; ++ u32 t; ++ ++ t = ath79_reset_rr(AR933X_RESET_REG_BOOTSTRAP); ++ if (t & AR933X_BOOTSTRAP_REF_CLK_40) ++ ref_rate = (40 * 1000 * 1000); ++ else ++ ref_rate = (25 * 1000 * 1000); ++ ++ ath79_setup_ref_clk(ref_rate); + + clock_ctrl = __raw_readl(pll_base + AR933X_PLL_CLOCK_CTRL_REG); + if (clock_ctrl & AR933X_PLL_CLOCK_CTRL_BYPASS) { +@@ -196,23 +210,6 @@ static void __init ar9330_clk_init(struc + ref_div * out_div * ahb_div); + } + +-static void __init ar933x_clocks_init(void __iomem *pll_base) +-{ +- struct clk *ref_clk; +- unsigned long ref_rate; +- u32 t; +- +- t = ath79_reset_rr(AR933X_RESET_REG_BOOTSTRAP); +- if (t & AR933X_BOOTSTRAP_REF_CLK_40) +- ref_rate = (40 * 1000 * 1000); +- else +- ref_rate = (25 * 1000 * 1000); +- +- ref_clk = ath79_set_clk(ATH79_CLK_REF, ref_rate); +- +- ar9330_clk_init(ref_clk, ath79_pll_base); +-} +- + static u32 __init ar934x_get_pll_freq(u32 ref, u32 ref_div, u32 nint, u32 nfrac, + u32 frac, u32 out_div) + { +@@ -252,6 +249,8 @@ static void __init ar934x_clocks_init(vo + else + ref_rate = 25 * 1000 * 1000; + ++ ref_rate = ath79_setup_ref_clk(ref_rate); ++ + pll = __raw_readl(dpll_base + AR934X_SRIF_CPU_DPLL2_REG); + if (pll & AR934X_SRIF_DPLL2_LOCAL_PLL) { + out_div = (pll >> AR934X_SRIF_DPLL2_OUTDIV_SHIFT) & +@@ -338,7 +337,6 @@ static void __init ar934x_clocks_init(vo + else + ahb_rate = cpu_pll / (postdiv + 1); + +- ath79_set_clk(ATH79_CLK_REF, ref_rate); + ath79_set_clk(ATH79_CLK_CPU, cpu_rate); + ath79_set_clk(ATH79_CLK_DDR, ddr_rate); + ath79_set_clk(ATH79_CLK_AHB, ahb_rate); +@@ -362,6 +360,8 @@ static void __init qca953x_clocks_init(v + else + ref_rate = 25 * 1000 * 1000; + ++ ref_rate = ath79_setup_ref_clk(ref_rate); ++ + pll = __raw_readl(pll_base + QCA953X_PLL_CPU_CONFIG_REG); + out_div = (pll >> QCA953X_PLL_CPU_CONFIG_OUTDIV_SHIFT) & + QCA953X_PLL_CPU_CONFIG_OUTDIV_MASK; +@@ -422,7 +422,6 @@ static void __init qca953x_clocks_init(v + else + ahb_rate = cpu_pll / (postdiv + 1); + +- ath79_set_clk(ATH79_CLK_REF, ref_rate); + ath79_set_clk(ATH79_CLK_CPU, cpu_rate); + ath79_set_clk(ATH79_CLK_DDR, ddr_rate); + ath79_set_clk(ATH79_CLK_AHB, ahb_rate); +@@ -444,6 +443,8 @@ static void __init qca955x_clocks_init(v + else + ref_rate = 25 * 1000 * 1000; + ++ ref_rate = ath79_setup_ref_clk(ref_rate); ++ + pll = __raw_readl(pll_base + QCA955X_PLL_CPU_CONFIG_REG); + out_div = (pll >> QCA955X_PLL_CPU_CONFIG_OUTDIV_SHIFT) & + QCA955X_PLL_CPU_CONFIG_OUTDIV_MASK; +@@ -504,7 +505,6 @@ static void __init qca955x_clocks_init(v + else + ahb_rate = cpu_pll / (postdiv + 1); + +- ath79_set_clk(ATH79_CLK_REF, ref_rate); + ath79_set_clk(ATH79_CLK_CPU, cpu_rate); + ath79_set_clk(ATH79_CLK_DDR, ddr_rate); + ath79_set_clk(ATH79_CLK_AHB, ahb_rate); +@@ -526,6 +526,8 @@ static void __init qca956x_clocks_init(v + else + ref_rate = 25 * 1000 * 1000; + ++ ref_rate = ath79_setup_ref_clk(ref_rate); ++ + pll = __raw_readl(pll_base + QCA956X_PLL_CPU_CONFIG_REG); + out_div = (pll >> QCA956X_PLL_CPU_CONFIG_OUTDIV_SHIFT) & + QCA956X_PLL_CPU_CONFIG_OUTDIV_MASK; +@@ -595,7 +597,6 @@ static void __init qca956x_clocks_init(v + else + ahb_rate = cpu_pll / (postdiv + 1); + +- ath79_set_clk(ATH79_CLK_REF, ref_rate); + ath79_set_clk(ATH79_CLK_CPU, cpu_rate); + ath79_set_clk(ATH79_CLK_DDR, ddr_rate); + ath79_set_clk(ATH79_CLK_AHB, ahb_rate); +@@ -671,10 +672,8 @@ static void __init ath79_clocks_init_dt_ + void __iomem *pll_base; + + ref_clk = of_clk_get(np, 0); +- if (IS_ERR(ref_clk)) { +- pr_err("%pOF: of_clk_get failed\n", np); +- goto err; +- } ++ if (!IS_ERR(ref_clk)) ++ clks[ATH79_CLK_REF] = ref_clk; + + pll_base = of_iomap(np, 0); + if (!pll_base) { +@@ -683,9 +682,9 @@ static void __init ath79_clocks_init_dt_ + } + + if (of_device_is_compatible(np, "qca,ar9130-pll")) +- ar724x_clk_init(ref_clk, pll_base); ++ ar724x_clocks_init(pll_base); + else if (of_device_is_compatible(np, "qca,ar9330-pll")) +- ar9330_clk_init(ref_clk, pll_base); ++ ar933x_clocks_init(pll_base); + else { + pr_err("%pOF: could not find any appropriate clk_init()\n", np); + goto err_iounmap; +@@ -703,9 +702,6 @@ err_iounmap: + + err_clk: + clk_put(ref_clk); +- +-err: +- return; + } + CLK_OF_DECLARE(ar9130_clk, "qca,ar9130-pll", ath79_clocks_init_dt_ng); + CLK_OF_DECLARE(ar9330_clk, "qca,ar9330-pll", ath79_clocks_init_dt_ng); |