linux-kernel - Re: [PATCH V3 3/5] clk: mmp: add clock definition for pxa910

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Message-Id: <201208160717.03707.arnd@arndb.de>
Date:	Thu, 16 Aug 2012 07:17:03 +0000
From:	Arnd Bergmann <arnd@...db.de>
To:	Chao Xie <xiechao.mail@...il.com>
Cc:	haojian.zhuang@...il.com, mturquette@...aro.org,
	viresh.linux@...il.com, s.hauer@...gutronix.de,
	chao.xie@...vell.com, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH V3 3/5] clk: mmp: add clock definition for pxa910

On Thursday 16 August 2012, Chao Xie wrote:

> +enum {
> +	clk32, vctcxo, pll1, pll1_2, pll1_4, pll1_8, pll1_16, pll1_6, pll1_12,
> +	pll1_24, pll1_48, pll1_96, pll1_13, pll1_13_1_5, pll1_2_1_5,
> +	pll1_3_16, uart_pll, twsi0, twsi1, gpio, kpc, rtc, pwm0, pwm1, pwm2,
> +	pwm3, uart0_mux, uart0, uart1_mux, uart1, uart2_mux, uart2,
> +	ssp0_mux, ssp0, ssp1_mux, ssp1, dfc, sdh0_mux, sdh0, sdh1_mux, sdh1,
> +	usb, sph, disp0_mux, disp0, ccic0_mux, ccic0, ccic0_phy_mux,
> +	ccic0_phy, ccic0_sphy_div, ccic0_sphy, clk_max
> +};

I wonder whether you should just get rid of this enum

> +void __init pxa910_clk_init(void)
> +{
> +	struct clk *clocks[clk_max];

and this array,

> +	clocks[clk32] =
> +	    clk_register_fixed_rate(NULL, "clk32", NULL, CLK_IS_ROOT, 3200);
> +	clk_register_clkdev(clocks[clk32], "clk32", NULL);
> +
> +	clocks[vctcxo] =
> +	    clk_register_fixed_rate(NULL, "vctcxo", NULL, CLK_IS_ROOT,
> +				    26000000);
> +	clk_register_clkdev(clocks[vctcxo], "vctcxo", NULL);

because now that the "obfuscation" macro is gone, it's clear that each index
is used only once here and then passed right into the next function. If you
write it like:

	struct clk *clk;

	clk = clk_register_fixed_rate(NULL, "clk32", NULL, CLK_IS_ROOT, 3200);
	clk_register_clkdev(clk, "clk32", NULL);

it becomes much shorter, partly because things start fitting into one
line again. The only exception in this file is 

> +	clocks[uart_pll] =
> +	    mmp_clk_register_factor("uart_pll", "pll1_4", 0,
> +				    mpmu_base + MPMU_UART_PLL,
> +				    &uart_factor_masks, uart_factor_tbl,
> +				    ARRAY_SIZE(uart_factor_tbl));
> +	clk_set_rate(clocks[uart_pll], 14745600);
> +	clk_register_clkdev(clocks[uart_pll], "uart_pll", NULL);

with

> +	clocks[uart0_mux] =
> +	    clk_register_mux(NULL, "uart0_mux", uart_parent,
> +			     ARRAY_SIZE(uart_parent), CLK_SET_RATE_PARENT,
> +			     apbc_base + APBC_UART0, 4, 3, 0, &clk_lock);
> +	clk_set_parent(clocks[uart0_mux], clocks[uart_pll]);
> +	clk_register_clkdev(clocks[uart0_mux], "uart_mux.0", NULL);
> +
> +	clocks[uart0] =
> +	    mmp_clk_register_apbc("uart0", "uart0_mux", apbc_base + APBC_UART0,
> +				  10, 0, &clk_lock);
> +	clk_register_clkdev(clocks[uart0], NULL, "pxa2xx-uart.0");

so just add another

	struct clk *clk_uart;

	clk_uart = mmp_clk_register_factor("uart_pll", "pll1_4", 0,
			mpmu_base + MPMU_UART_PLL, &uart_factor_masks, uart_factor_tbl,
			ARRAY_SIZE(uart_factor_tbl));



	Arnd
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