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Date: Thu, 27 Nov 2014 16:51:35 +0100
From: Arnd Bergmann <arnd@...db.de>
To: cw00.choi@...sung.com
Cc: Sylwester Nawrocki <s.nawrocki@...sung.com>,
"linux-samsung-soc@...r.kernel.org"
<linux-samsung-soc@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"kgene.kim@...sung.com" <kgene.kim@...sung.com>,
"mark.rutland@....com" <mark.rutland@....com>,
"olof@...om.net" <olof@...om.net>,
"catalin.marinas@....com" <catalin.marinas@....com>,
"will.deacon@....com" <will.deacon@....com>,
"tomasz.figa@...il.com" <tomasz.figa@...il.com>,
"thomas.abraham@...aro.org" <thomas.abraham@...aro.org>,
"linus.walleij@...aro.org" <linus.walleij@...aro.org>,
"kyungmin.park@...sung.com" <kyungmin.park@...sung.com>,
"inki.dae@...sung.com" <inki.dae@...sung.com>,
"chanho61.park@...sung.com" <chanho61.park@...sung.com>,
"geunsik.lim@...sung.com" <geunsik.lim@...sung.com>,
"sw0312.kim@...sung.com" <sw0312.kim@...sung.com>,
"jh80.chung@...sung.com" <jh80.chung@...sung.com>,
"a.kesavan@...sung.com" <a.kesavan@...sung.com>,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
"linux-arm-kernel@...ts.infradead.org"
<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 11/19] clk: samsung: exynos5433: Add clocks for CMU_BUS{0|1|2} domains
On Friday 28 November 2014 00:44:07 Chanwoo Choi wrote:
> >
> >> +#define bus_div_clks(num) \
> >> +static struct samsung_div_clock bus##num_div_clks[] __initdata = { \
> >> + /* DIV_BUS */ \
> >> + DIV(CLK_DIV_PCLK_BUS##num_133, "div_pclk_bus"#num"_133", \
> >> + "aclk_bus"#num"_400", DIV_BUS##num, 0, 3), \
> >> +}; \
> >
> > To illustrate my point further: CLK_DIV_PCLK_BUS0/1/2 are all the
> > same, and so are DIV_BUS0/1/2, so you should not need to duplicate
> > the definitions at all but just call them 'CLK_DIV_PCLK_BUS'
> > and 'DIV_BUS'.
>
> CLK_DIV_PCLK_BUS0/1/2 is not all the same.
> Each CLK_DIV_PCLK_BUS0/1/2 must need the unique clock number.
> Because some device may need some clocks by using unique clock number.
This is from your original patch:
+/* CMU_BUS0 */
+#define CLK_DIV_PCLK_BUS0_133 1
+
+#define CLK_ACLK_AHB2APB_BUS0P 2
+#define CLK_ACLK_BUS0NP_133 3
+#define CLK_ACLK_BUS0ND_400 4
+#define CLK_PCLK_BUS0SRVND_133 5
+#define CLK_PCLK_PMU_BUS0 6
+#define CLK_PCLK_SYSREG_BUS0 7
+
+#define BUS0_NR_CLK 8
+
+/* CMU_BUS1 */
+#define CLK_DIV_PCLK_BUS1_133 1
+
+#define CLK_ACLK_AHB2APB_BUS1P 2
+#define CLK_ACLK_BUS1NP_133 3
+#define CLK_ACLK_BUS1ND_400 4
+#define CLK_PCLK_BUS1SRVND_133 5
+#define CLK_PCLK_PMU_BUS1 6
+#define CLK_PCLK_SYSREG_BUS1 7
+
+#define BUS1_NR_CLK 8
+
+/* CMU_BUS2 */
+#define CLK_MOUT_ACLK_BUS2_400_USER 1
+
+#define CLK_DIV_PCLK_BUS2_133 2
+
+#define CLK_ACLK_AHB2APB_BUS2P 3
+#define CLK_ACLK_BUS2NP_133 4
+#define CLK_ACLK_BUS2BEND_400 5
+#define CLK_ACLK_BUS2RTND_400 6
+#define CLK_PCLK_BUS2SRVND_133 7
+#define CLK_PCLK_PMU_BUS2 8
+#define CLK_PCLK_SYSREG_BUS2 9
+
+#define BUS2_NR_CLK 10
The numbers are arbitrarily assigned, but for bus0 and bus1,
they are all identical, while bus2 uses a lightly different
numbering, which you could easily change, e.g. by using the
numbers you have for bus2 on bus0 and bus1 as well.
+ * Register offset definitions for CMU_BUS0
+ */
+#define DIV_BUS0 0x0600
+#define DIV_STAT_BUS0 0x0700
+#define ENABLE_ACLK_BUS0 0x0800
+#define ENABLE_PCLK_BUS0 0x0900
+#define ENABLE_IP_BUS0 0x0b00
+#define ENABLE_IP_BUS1 0x0b04
+
+/*
+ * Register offset definitions for CMU_BUS1
+ */
+#define DIV_BUS1 0x0600
+#define DIV_STAT_BUS1 0x0700
+#define ENABLE_ACLK_BUS1 0x0800
+#define ENABLE_PCLK_BUS1 0x0900
+#define ENABLE_IP_BUS10 0x0b00
+#define ENABLE_IP_BUS11 0x0b04
+/*
+ * Register offset definitions for CMU_BUS2
+ */
+#define MUX_SEL_BUS2 0x0200
+#define MUX_ENABLE_BUS2 0x0300
+#define MUX_STAT_BUS2 0x0400
+#define DIV_BUS2 0x0600
+#define DIV_STAT_BUS2 0x0700
+#define ENABLE_ACLK_BUS2 0x0800
+#define ENABLE_PCLK_BUS2 0x0900
+#define ENABLE_IP_BUS20 0x0b00
+#define ENABLE_IP_BUS21 0x0b04
More importantly, the register offsets are all identical, except that
bus2 has the additional MUX_SEL and MUX_ENABLE definitions. It's very
obvious that this is the same hardware block in multiple instances.
Arnd
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