From bdb08cb2d3491d441dd403dfb88d90ba90fb7232 Mon Sep 17 00:00:00 2001 From: Russell King Date: Mon, 30 Jun 2008 19:47:59 +0100 Subject: [ARM] pxa: allow clk aliases We need to support more than one name+device for a struct clk for a small number of peripherals. We do this by re-using struct clk alias to another struct clk - IOW, if we find that the entry we're using is an alias, we return the aliased entry not the one we found. Signed-off-by: Russell King --- arch/arm/mach-pxa/clock.c | 3 +++ arch/arm/mach-pxa/clock.h | 12 ++++++++++++ arch/arm/mach-pxa/pxa25x.c | 8 ++++++++ 3 files changed, 23 insertions(+) (limited to 'arch/arm') diff --git a/arch/arm/mach-pxa/clock.c b/arch/arm/mach-pxa/clock.c index e97dc59813c..68afc396b4a 100644 --- a/arch/arm/mach-pxa/clock.c +++ b/arch/arm/mach-pxa/clock.c @@ -47,6 +47,9 @@ struct clk *clk_get(struct device *dev, const char *id) clk = p; mutex_unlock(&clocks_mutex); + if (!IS_ERR(clk) && clk->ops == NULL) + clk = clk->other; + return clk; } EXPORT_SYMBOL(clk_get); diff --git a/arch/arm/mach-pxa/clock.h b/arch/arm/mach-pxa/clock.h index bc6b77e1592..83cbfaba485 100644 --- a/arch/arm/mach-pxa/clock.h +++ b/arch/arm/mach-pxa/clock.h @@ -15,6 +15,7 @@ struct clk { unsigned int cken; unsigned int delay; unsigned int enabled; + struct clk *other; }; #define INIT_CKEN(_name, _cken, _rate, _delay, _dev) \ @@ -35,6 +36,17 @@ struct clk { .cken = CKEN_##_cken, \ } +/* + * This is a placeholder to alias one clock device+name pair + * to another struct clk. + */ +#define INIT_CKOTHER(_name, _other, _dev) \ + { \ + .name = _name, \ + .dev = _dev, \ + .other = _other, \ + } + extern const struct clkops clk_cken_ops; void clk_cken_enable(struct clk *clk); diff --git a/arch/arm/mach-pxa/pxa25x.c b/arch/arm/mach-pxa/pxa25x.c index e5b417d14bb..09ee131d24a 100644 --- a/arch/arm/mach-pxa/pxa25x.c +++ b/arch/arm/mach-pxa/pxa25x.c @@ -117,6 +117,10 @@ static struct clk pxa25x_hwuart_clk = INIT_CKEN("UARTCLK", HWUART, 14745600, 1, &pxa_device_hwuart.dev) ; +/* + * PXA 2xx clock declarations. Order is important (see aliases below) + * Please be careful not to disrupt the ordering. + */ static struct clk pxa25x_clks[] = { INIT_CK("LCDCLK", LCD, &clk_pxa25x_lcd_ops, &pxa_device_fb.dev), INIT_CKEN("UARTCLK", FFUART, 14745600, 1, &pxa_device_ffuart.dev), @@ -140,6 +144,8 @@ static struct clk pxa25x_clks[] = { INIT_CKEN("FICPCLK", FICP, 47923000, 0, NULL), }; +static struct clk gpio7_clk = INIT_CKOTHER("GPIO7_CK", &pxa25x_clks[4], NULL); + #ifdef CONFIG_PM #define SAVE(x) sleep_save[SLEEP_SAVE_##x] = x @@ -311,6 +317,8 @@ static int __init pxa25x_init(void) if (cpu_is_pxa25x()) ret = platform_device_register(&pxa_device_hwuart); + clks_register(&gpio7_clk, 1); + return ret; } -- cgit v1.2.3