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MIPS: ath79: export switch MDIO reference clock 

On AR934x, the MDIO reference clock can be configured to a fixed 100 MHz
clock. If that feature is not used, it defaults to the main reference
clock, like on all other SoC.

Signed-off-by: Felix Fietkau <nbd@nbd.name>
Signed-off-by: John Crispin <john@phrozen.org>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Paul Burton <paul.burton@mips.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: James Hogan <jhogan@kernel.org>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Pengutronix Kernel Team <kernel@pengutronix.de>
Cc: linux-mips@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: devicetree@vger.kernel.org
This commit is contained in:
Felix Fietkau 2019-01-11 15:22:35 +01:00 committed by Paul Burton
parent e7eea04d50
commit 6810ed320e
No known key found for this signature in database
GPG Key ID: 3EA79FACB57500DD
2 changed files with 10 additions and 1 deletions
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8
arch/mips/ath79/clock.c
View File

@ -42,6 +42,7 @@ static const char * const clk_names[ATH79_CLK_END] = {
[ATH79_CLK_DDR] = "ddr",
[ATH79_CLK_AHB] = "ahb",
[ATH79_CLK_REF] = "ref",
[ATH79_CLK_MDIO] = "mdio",
};
static const char * __init ath79_clk_name(int type)
@ -342,6 +343,10 @@ static void __init ar934x_clocks_init(void __iomem *pll_base)
ath79_set_clk(ATH79_CLK_DDR, ddr_rate);
ath79_set_clk(ATH79_CLK_AHB, ahb_rate);
clk_ctrl = __raw_readl(pll_base + AR934X_PLL_SWITCH_CLOCK_CONTROL_REG);
if (clk_ctrl & AR934X_PLL_SWITCH_CLOCK_CONTROL_MDIO_CLK_SEL)
ath79_set_clk(ATH79_CLK_MDIO, 100 * 1000 * 1000);
iounmap(dpll_base);
}
@ -698,6 +703,9 @@ static void __init ath79_clocks_init_dt(struct device_node *np)
else if (of_device_is_compatible(np, "qca,qca9560-pll"))
qca956x_clocks_init(pll_base);
if (!clks[ATH79_CLK_MDIO])
clks[ATH79_CLK_MDIO] = 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;

3
include/dt-bindings/clock/ath79-clk.h
View File

@ -14,7 +14,8 @@
#define ATH79_CLK_DDR 1
#define ATH79_CLK_AHB 2
#define ATH79_CLK_REF 3
#define ATH79_CLK_MDIO 4
#define ATH79_CLK_END 4
#define ATH79_CLK_END 5
#endif /* __DT_BINDINGS_ATH79_CLK_H */