From: Simon Horman <horms@verge.net.au> To: linux-arm-kernel@lists.infradead.org Subject: [PATCH] ARM: shmobile: r8a7740: add USB24 clock explain and sample code Date: Thu, 30 Aug 2012 05:52:49 +0000 [thread overview] Message-ID: <1346305969-27110-2-git-send-email-horms@verge.net.au> (raw) In-Reply-To: <1346305969-27110-1-git-send-email-horms@verge.net.au> From: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> USBCKCR is controlling USB parent clock and divide rate. This parent clock is used as a "usb24s" from other devices, but the "divide rate" is not used. Further, this clock itself is known as "usb24". So, to set this clock is a little confusable. This patch adds quick explain and sample code for this clock. Cc: Damian Hobson-Garcia <dhobsong@igel.co.jp> Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> Signed-off-by: Simon Horman <horms@verge.net.au> --- arch/arm/mach-shmobile/clock-r8a7740.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/arch/arm/mach-shmobile/clock-r8a7740.c b/arch/arm/mach-shmobile/clock-r8a7740.c index ad5fccc..a6a7583 100644 --- a/arch/arm/mach-shmobile/clock-r8a7740.c +++ b/arch/arm/mach-shmobile/clock-r8a7740.c @@ -188,6 +188,22 @@ static struct clk pllc1_div2_clk = { }; /* USB clock */ +/* + * USBCKCR is controlling usb24 clock + * bit[7] : parent clock + * bit[6] : clock divide rate + * And this bit[7] is used as a "usb24s" from other devices. + * (Video clock / Sub clock / SPU clock) + * You can controll this clock as a below. + * + * struct clk *usb24 = clk_get(dev, "usb24"); + * struct clk *usb24s = clk_get(NULL, "usb24s"); + * struct clk *system = clk_get(NULL, "system_clk"); + * int rate = clk_get_rate(system); + * + * clk_set_parent(usb24s, system); // for bit[7] + * clk_set_rate(usb24, rate / 2); // for bit[6] + */ static struct clk *usb24s_parents[] = { [0] = &system_clk, [1] = &extal2_clk -- 1.7.10.2.484.gcd07cc5
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From: horms@verge.net.au (Simon Horman) To: linux-arm-kernel@lists.infradead.org Subject: [PATCH] ARM: shmobile: r8a7740: add USB24 clock explain and sample code Date: Thu, 30 Aug 2012 14:52:49 +0900 [thread overview] Message-ID: <1346305969-27110-2-git-send-email-horms@verge.net.au> (raw) In-Reply-To: <1346305969-27110-1-git-send-email-horms@verge.net.au> From: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> USBCKCR is controlling USB parent clock and divide rate. This parent clock is used as a "usb24s" from other devices, but the "divide rate" is not used. Further, this clock itself is known as "usb24". So, to set this clock is a little confusable. This patch adds quick explain and sample code for this clock. Cc: Damian Hobson-Garcia <dhobsong@igel.co.jp> Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> Signed-off-by: Simon Horman <horms@verge.net.au> --- arch/arm/mach-shmobile/clock-r8a7740.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/arch/arm/mach-shmobile/clock-r8a7740.c b/arch/arm/mach-shmobile/clock-r8a7740.c index ad5fccc..a6a7583 100644 --- a/arch/arm/mach-shmobile/clock-r8a7740.c +++ b/arch/arm/mach-shmobile/clock-r8a7740.c @@ -188,6 +188,22 @@ static struct clk pllc1_div2_clk = { }; /* USB clock */ +/* + * USBCKCR is controlling usb24 clock + * bit[7] : parent clock + * bit[6] : clock divide rate + * And this bit[7] is used as a "usb24s" from other devices. + * (Video clock / Sub clock / SPU clock) + * You can controll this clock as a below. + * + * struct clk *usb24 = clk_get(dev, "usb24"); + * struct clk *usb24s = clk_get(NULL, "usb24s"); + * struct clk *system = clk_get(NULL, "system_clk"); + * int rate = clk_get_rate(system); + * + * clk_set_parent(usb24s, system); // for bit[7] + * clk_set_rate(usb24, rate / 2); // for bit[6] + */ static struct clk *usb24s_parents[] = { [0] = &system_clk, [1] = &extal2_clk -- 1.7.10.2.484.gcd07cc5
next prev parent reply other threads:[~2012-08-30 5:52 UTC|newest] Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top 2012-08-30 5:52 [GIT PULL] Renesas ARM-based SoC: r8a7740 SoC for 3.7 Simon Horman 2012-08-30 5:52 ` Simon Horman 2012-08-30 5:52 ` Simon Horman [this message] 2012-08-30 5:52 ` [PATCH] ARM: shmobile: r8a7740: add USB24 clock explain and sample code Simon Horman 2012-09-05 22:54 ` Olof Johansson 2012-09-05 22:54 ` Olof Johansson 2012-09-07 1:23 ` Kuninori Morimoto 2012-09-07 1:23 ` Kuninori Morimoto -- strict thread matches above, loose matches on Subject: below -- 2012-08-08 8:55 Kuninori Morimoto 2012-08-27 8:44 ` Simon Horman
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