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Message-ID: <20130823165539.GD7015@e106331-lin.cambridge.arm.com> Date: Fri, 23 Aug 2013 17:55:39 +0100 From: Mark Rutland <mark.rutland@....com> To: Lee Jones <lee.jones@...aro.org> Cc: Sascha Hauer <s.hauer@...gutronix.de>, Linus Walleij <linus.walleij@...aro.org>, "linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, Arnd Bergmann <arnd@...db.de>, "devicetree@...r.kernel.org" <devicetree@...r.kernel.org> Subject: Re: [PATCH 09/33] ARM: ux500: Supply the I2C clocks lookup to the DBX500 DT On Fri, Aug 23, 2013 at 08:56:07AM +0100, Lee Jones wrote: > I had a short chat with Rob last night about this. I'm going to loop > him in to the conversation, as he wrote the binding. > > > > When most of the other clocks that we deal with are being requested, > > > they rely on being index zero: > > > > > > drivers/i2c/busses/i2c-nomadik.c: dev->clk = clk_get(&adev->dev, NULL); > > > > Look at drivers/clk/clkdev.c, there's some fuzzy matching > > involved when you pass NULL as connection id. > > Yes, I've been looking at that. This is why it works currently. I > think I need to change all of the drivers to specify which clock they > want. At the moment that 'fuzzy matching' is what's saving us. If > anyone were to change our DTS file to match what the binding says, > then it would cease to work. I'm guessing this is the same for all > other DTS files too: I think if anything, the binding document(s) should be updated to describe that apb_pclk is referred to by name, and the names of the other clocks should be described in the specific device bindings. We can then modify the drivers which grab clock 0 to explicitly grab the first clock by name, and backwards compatibility should not be broken. I don't believe any other OS has implemented the common clock bindings, and we've never supported the binding as described. Let's correct the de-facto standard into a standard by decree. Thanks, Mark. > > arch/arm/boot/dts/imx23.dtsi: clock-names = "uart", "apb_pclk"; > arch/arm/boot/dts/imx28.dtsi: clock-names = "uart", "apb_pclk"; > arch/arm/boot/dts/nspire-cx.dts: clock-names = "uart_clk", "apb_pclk"; > arch/arm/boot/dts/ste-nomadik-stn8815.dtsi: clock-names = "timclk", "apb_pclk"; > arch/arm/boot/dts/ste-nomadik-stn8815.dtsi: clock-names = "timclk", "apb_pclk"; > arch/arm/boot/dts/ste-nomadik-stn8815.dtsi: clock-names = "uartclk", "apb_pclk"; > arch/arm/boot/dts/ste-nomadik-stn8815.dtsi: clock-names = "uartclk", "apb_pclk"; > arch/arm/boot/dts/ste-nomadik-stn8815.dtsi: clock-names = "uartclk", "apb_pclk"; > arch/arm/boot/dts/ste-nomadik-stn8815.dtsi: clock-names = "rng", "apb_pclk"; > arch/arm/boot/dts/ste-nomadik-stn8815.dtsi: clock-names = "mclk", "apb_pclk"; > arch/arm/boot/dts/vexpress-v2m-rs1.dtsi: clock-names = "refclk", "timclk", "apb_pclk"; > arch/arm/boot/dts/vexpress-v2m-rs1.dtsi: clock-names = "mclk", "apb_pclk"; > arch/arm/boot/dts/vexpress-v2m-rs1.dtsi: clock-names = "KMIREFCLK", "apb_pclk"; > arch/arm/boot/dts/vexpress-v2m-rs1.dtsi: clock-names = "KMIREFCLK", "apb_pclk"; > arch/arm/boot/dts/vexpress-v2m-rs1.dtsi: clock-names = "uartclk", "apb_pclk"; > arch/arm/boot/dts/vexpress-v2m-rs1.dtsi: clock-names = "uartclk", "apb_pclk"; > arch/arm/boot/dts/vexpress-v2m-rs1.dtsi: clock-names = "uartclk", "apb_pclk"; > arch/arm/boot/dts/vexpress-v2m-rs1.dtsi: clock-names = "uartclk", "apb_pclk"; > arch/arm/boot/dts/vexpress-v2m-rs1.dtsi: clock-names = "wdogclk", "apb_pclk"; > arch/arm/boot/dts/vexpress-v2m-rs1.dtsi: clock-names = "timclken1", "timclken2", "apb_pclk"; > arch/arm/boot/dts/vexpress-v2m-rs1.dtsi: clock-names = "timclken1", "timclken2", "apb_pclk"; > arch/arm/boot/dts/vexpress-v2m-rs1.dtsi: clock-names = "clcdclk", "apb_pclk"; > arch/arm/boot/dts/vexpress-v2m.dtsi: clock-names = "refclk", "timclk", "apb_pclk"; > arch/arm/boot/dts/vexpress-v2m.dtsi: clock-names = "mclk", "apb_pclk"; > arch/arm/boot/dts/vexpress-v2m.dtsi: clock-names = "KMIREFCLK", "apb_pclk"; > arch/arm/boot/dts/vexpress-v2m.dtsi: clock-names = "KMIREFCLK", "apb_pclk"; > arch/arm/boot/dts/vexpress-v2m.dtsi: clock-names = "uartclk", "apb_pclk"; > arch/arm/boot/dts/vexpress-v2m.dtsi: clock-names = "uartclk", "apb_pclk"; > arch/arm/boot/dts/vexpress-v2m.dtsi: clock-names = "uartclk", "apb_pclk"; > arch/arm/boot/dts/vexpress-v2m.dtsi: clock-names = "uartclk", "apb_pclk"; > arch/arm/boot/dts/vexpress-v2m.dtsi: clock-names = "wdogclk", "apb_pclk"; > arch/arm/boot/dts/vexpress-v2m.dtsi: clock-names = "timclken1", "timclken2", "apb_pclk"; > arch/arm/boot/dts/vexpress-v2m.dtsi: clock-names = "timclken1", "timclken2", "apb_pclk"; > arch/arm/boot/dts/vexpress-v2m.dtsi: clock-names = "clcdclk", "apb_pclk"; > arch/arm/boot/dts/vexpress-v2p-ca15_a7.dts: clock-names = "wdogclk", "apb_pclk"; > arch/arm/boot/dts/vexpress-v2p-ca9.dts: clock-names = "clcdclk", "apb_pclk"; > arch/arm/boot/dts/vexpress-v2p-ca9.dts: clock-names = "timclk", "apb_pclk"; > arch/arm/boot/dts/vexpress-v2p-ca9.dts: clock-names = "wdogclk", "apb_pclk"; > > -- > Lee Jones > Linaro ST-Ericsson Landing Team Lead > Linaro.org │ Open source software for ARM SoCs > Follow Linaro: Facebook | Twitter | Blog > -- 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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