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Date: Wed, 11 Nov 2015 12:16:27 +0900 From: Masahiro Yamada <yamada.masahiro@...ionext.com> To: linux-clk@...r.kernel.org Cc: linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org> Subject: How to implement common clk in multi function controller? Hi. I am implementing clk and reset drivers for my SoCs. (drivers/clk/uniphier/* and drivers/reset/uniphier/*) In my SoCs, one hardware block contains various registers for both clock and reset controlling. (so, it is like a MFD system controller device). I think it is a common case. I am guessing my device tree would be like follows: (one syscon device contains clk and rst devices under it) syscon { compatible = "socionext,uniphier-syscon", "syscon", "simple-mfd"; reg = <... ...>; clk_ctrl { .compatible = "socionext,uniphier-clkctrl"; #clock-cells = <1>; }; rst_ctrl { .compatible = "socionext,uniphier-rstctrl"; #reset-cells = <1>; }; }; One problem I noticed was, we are supposed to use regmap for register access if we use syscon. OTOH, common clk APIs such as clk-gate, clk-divider expect simple register access via writel()/readl(). Is it a good idea to expand such APIs to regmap? Of course, I could my own uniphier/clk-gate.c to use regmap as other SoCs do. But, I think regmap is general demand, so I am wondering if it could be supported in common parts. Or, any other good solution exists? -- Best Regards Masahiro Yamada -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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