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Commit 53f9443d authored by Shawn Guo's avatar Shawn Guo
Browse files

clk: mxs: replace imx23 clk_register_clkdev with clock DT lookup 



It really becomes a maintenance issue that every time a device needs
to look up (clk_get) a clock we have to patch kernel clock file to call
clk_register_clkdev for that clock.

Since clock DT support which is meant to resolve clock lookup in device
tree is in place, the patch moves imx23 client devices' clock lookup
over to device tree, so that any new lookup to be added at later time
can just get done in DT instead of kernel.

Signed-off-by: default avatarShawn Guo <shawn.guo@linaro.org>
parent b598b9f3

Documentation/devicetree/bindings/clock/imx23-clock.txt

0 → 100644
+76 −0
Original line number Diff line number Diff line 
* Clock bindings for Freescale i.MX23



Required properties:

- compatible: Should be "fsl,imx23-clkctrl"

- reg: Address and length of the register set

- #clock-cells: Should be <1>



The clock consumer should specify the desired clock by having the clock

ID in its "clocks" phandle cell.  The following is a full list of i.MX23

clocks and IDs.



	Clock		ID

	------------------

	ref_xtal	0

	pll		1

	ref_cpu		2

	ref_emi		3

	ref_pix		4

	ref_io		5

	saif_sel	6

	lcdif_sel	7

	gpmi_sel	8

	ssp_sel		9

	emi_sel		10

	cpu		11

	etm_sel		12

	cpu_pll		13

	cpu_xtal	14

	hbus		15

	xbus		16

	lcdif_div	17

	ssp_div		18

	gpmi_div	19

	emi_pll		20

	emi_xtal	21

	etm_div		22

	saif_div	23

	clk32k_div	24

	rtc		25

	adc		26

	spdif_div	27

	clk32k		28

	dri		29

	pwm		30

	filt		31

	uart		32

	ssp		33

	gpmi		34

	spdif		35

	emi		36

	saif		37

	lcdif		38

	etm		39

	usb		40

	usb_pwr		41



Examples:



clks: clkctrl@80040000 {

	compatible = "fsl,imx23-clkctrl";

	reg = <0x80040000 0x2000>;

	#clock-cells = <1>;

	clock-output-names =

		...

		"uart",		/* 32 */

		...

		"end_of_list";

};



auart0: serial@8006c000 {

	compatible = "fsl,imx23-auart";

	reg = <0x8006c000 0x2000>;

	interrupts = <24 25 23>;

	clocks = <&clks 32>;

	status = "disabled";

};

arch/arm/boot/dts/imx23.dtsi

+14 −2
Original line number Diff line number Diff line
@@ -52,6 +52,7 @@ 
			dma-apbh@80004000 {

				compatible = "fsl,imx23-dma-apbh";

				reg = <0x80004000 0x2000>;

				clocks = <&clks 15>;

			};



			ecc@80008000 {
@@ -67,6 +68,7 @@ 
				reg-names = "gpmi-nand", "bch";

				interrupts = <13>, <56>;

				interrupt-names = "gpmi-dma", "bch";

				clocks = <&clks 34>;

				fsl,gpmi-dma-channel = <4>;

				status = "disabled";

			};
@@ -74,6 +76,7 @@ 
			ssp0: ssp@80010000 {

				reg = <0x80010000 0x2000>;

				interrupts = <15 14>;

				clocks = <&clks 33>;

				fsl,ssp-dma-channel = <1>;

				status = "disabled";

			};
@@ -290,6 +293,7 @@ 
			dma-apbx@80024000 {

				compatible = "fsl,imx23-dma-apbx";

				reg = <0x80024000 0x2000>;

				clocks = <&clks 16>;

			};



			dcp@80028000 {
@@ -316,12 +320,14 @@ 
				compatible = "fsl,imx23-lcdif";

				reg = <0x80030000 2000>;

				interrupts = <46 45>;

				clocks = <&clks 38>;

				status = "disabled";

			};



			ssp1: ssp@80034000 {

				reg = <0x80034000 0x2000>;

				interrupts = <2 20>;

				clocks = <&clks 33>;

				fsl,ssp-dma-channel = <2>;

				status = "disabled";

			};
@@ -339,9 +345,10 @@ 
			reg = <0x80040000 0x40000>;

			ranges;



			clkctl@80040000 {

			clks: clkctrl@80040000 {

				compatible = "fsl,imx23-clkctrl";

				reg = <0x80040000 0x2000>;

				status = "disabled";

				#clock-cells = <1>;

			};



			saif0: saif@80042000 {
@@ -393,6 +400,7 @@ 
			pwm: pwm@80064000 {

				compatible = "fsl,imx23-pwm";

				reg = <0x80064000 0x2000>;

				clocks = <&clks 30>;

				#pwm-cells = <2>;

				fsl,pwm-number = <5>;

				status = "disabled";
@@ -407,6 +415,7 @@ 
				compatible = "fsl,imx23-auart";

				reg = <0x8006c000 0x2000>;

				interrupts = <24 25 23>;

				clocks = <&clks 32>;

				status = "disabled";

			};
@@ -414,6 +423,7 @@ 
				compatible = "fsl,imx23-auart";

				reg = <0x8006e000 0x2000>;

				interrupts = <59 60 58>;

				clocks = <&clks 32>;

				status = "disabled";

			};
@@ -421,6 +431,8 @@ 
				compatible = "arm,pl011", "arm,primecell";

				reg = <0x80070000 0x2000>;

				interrupts = <0>;

				clocks = <&clks 32>, <&clks 16>;

				clock-names = "uart", "apb_pclk";

				status = "disabled";

			};

drivers/clk/mxs/clk-imx23.c

+10 −45
Original line number Diff line number Diff line
@@ -14,6 +14,7 @@ 
#include <linux/err.h>

#include <linux/init.h>

#include <linux/io.h>

#include <linux/of.h>

#include <mach/common.h>

#include <mach/mx23.h>

#include "clk.h"
@@ -71,44 +72,6 @@ static void __init clk_misc_init(void) 
	__mxs_setl(30 << BP_FRAC_IOFRAC, FRAC);

}



static struct clk_lookup uart_lookups[] = {

	{ .dev_id = "duart", },

	{ .dev_id = "mxs-auart.0", },

	{ .dev_id = "mxs-auart.1", },

	{ .dev_id = "8006c000.serial", },

	{ .dev_id = "8006e000.serial", },

	{ .dev_id = "80070000.serial", },

};



static struct clk_lookup hbus_lookups[] = {

	{ .dev_id = "imx23-dma-apbh", },

	{ .dev_id = "80004000.dma-apbh", },

};



static struct clk_lookup xbus_lookups[] = {

	{ .dev_id = "duart", .con_id = "apb_pclk"},

	{ .dev_id = "80070000.serial", .con_id = "apb_pclk"},

	{ .dev_id = "imx23-dma-apbx", },

	{ .dev_id = "80024000.dma-apbx", },

};



static struct clk_lookup ssp_lookups[] = {

	{ .dev_id = "imx23-mmc.0", },

	{ .dev_id = "imx23-mmc.1", },

	{ .dev_id = "80010000.ssp", },

	{ .dev_id = "80034000.ssp", },

};



static struct clk_lookup lcdif_lookups[] = {

	{ .dev_id = "imx23-fb", },

	{ .dev_id = "80030000.lcdif", },

};



static struct clk_lookup gpmi_lookups[] = {

	{ .dev_id = "imx23-gpmi-nand", },

	{ .dev_id = "8000c000.gpmi-nand", },

};



static const char *sel_pll[]  __initconst = { "pll", "ref_xtal", };

static const char *sel_cpu[]  __initconst = { "ref_cpu", "ref_xtal", };

static const char *sel_pix[]  __initconst = { "ref_pix", "ref_xtal", };
@@ -127,6 +90,7 @@ enum imx23_clk { 
};



static struct clk *clks[clk_max];

static struct clk_onecell_data clk_data;



static enum imx23_clk clks_init_on[] __initdata = {

	cpu, hbus, xbus, emi, uart,
@@ -134,6 +98,7 @@ static enum imx23_clk clks_init_on[] __initdata = { 


int __init mx23_clocks_init(void)

{

	struct device_node *np;

	int i;



	clk_misc_init();
@@ -188,14 +153,14 @@ int __init mx23_clocks_init(void) 
			return PTR_ERR(clks[i]);

		}



	np = of_find_compatible_node(NULL, NULL, "fsl,imx23-clkctrl");

	if (np) {

		clk_data.clks = clks;

		clk_data.clk_num = ARRAY_SIZE(clks);

		of_clk_add_provider(np, of_clk_src_onecell_get, &clk_data);

	}



	clk_register_clkdev(clks[clk32k], NULL, "timrot");

	clk_register_clkdev(clks[pwm], NULL, "80064000.pwm");

	clk_register_clkdevs(clks[hbus], hbus_lookups, ARRAY_SIZE(hbus_lookups));

	clk_register_clkdevs(clks[xbus], xbus_lookups, ARRAY_SIZE(xbus_lookups));

	clk_register_clkdevs(clks[uart], uart_lookups, ARRAY_SIZE(uart_lookups));

	clk_register_clkdevs(clks[ssp], ssp_lookups, ARRAY_SIZE(ssp_lookups));

	clk_register_clkdevs(clks[gpmi], gpmi_lookups, ARRAY_SIZE(gpmi_lookups));

	clk_register_clkdevs(clks[lcdif], lcdif_lookups, ARRAY_SIZE(lcdif_lookups));



	for (i = 0; i < ARRAY_SIZE(clks_init_on); i++)

		clk_prepare_enable(clks[clks_init_on[i]]);