ARM: shmobile: rcar-gen2: Add support for CPG/MSSR bindings
When using the new CPG/MSSR bindings, there is no longer a "renesas,rcar-gen2-cpg-clocks" node, and the code to obtain the external clock crystal frequency falls back to a default of 20 MHz. While this is correct for all upstream R-Car Gen2 and RZ/G1 boards, this is not necessarily the case for out-of-tree third party boards. Add support for finding the external clock crystal oscillator on RZ/G1M, and on R-Car H2, M2-W, and M2-N using the new CPG/MSSR bindings, through the corresponding "renesas,r8a77xx-cpg-mssr" nodes. Note that this is not needed on R-Car V2H and E2, and on RZ/G1E, as on those SoCs the arch_timer and generic counter clock is derived from the ZS clock instead. Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
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@ -29,17 +29,29 @@
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#include "common.h"
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#include "rcar-gen2.h"
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static const struct of_device_id cpg_matches[] __initconst = {
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{ .compatible = "renesas,rcar-gen2-cpg-clocks", },
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{ .compatible = "renesas,r8a7743-cpg-mssr", .data = "extal" },
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{ .compatible = "renesas,r8a7790-cpg-mssr", .data = "extal" },
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{ .compatible = "renesas,r8a7791-cpg-mssr", .data = "extal" },
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{ .compatible = "renesas,r8a7793-cpg-mssr", .data = "extal" },
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{ /* sentinel */ }
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};
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static unsigned int __init get_extal_freq(void)
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{
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const struct of_device_id *match;
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struct device_node *cpg, *extal;
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u32 freq = 20000000;
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int idx = 0;
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cpg = of_find_compatible_node(NULL, NULL,
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"renesas,rcar-gen2-cpg-clocks");
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cpg = of_find_matching_node_and_match(NULL, cpg_matches, &match);
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if (!cpg)
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return freq;
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extal = of_parse_phandle(cpg, "clocks", 0);
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if (match->data)
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idx = of_property_match_string(cpg, "clock-names", match->data);
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extal = of_parse_phandle(cpg, "clocks", idx);
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of_node_put(cpg);
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if (!extal)
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return freq;
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