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Date: Thu, 05 Feb 2015 14:52:52 +0900
From: Chanwoo Choi <cw00.choi@...sung.com>
To: Sylwester Nawrocki <s.nawrocki@...sung.com>
Cc: mturquette@...aro.org, tomasz.figa@...il.com, kgene@...nel.org,
pankaj.dubey@...sung.com, sangbae90.lee@...sung.com,
inki.dae@...sung.com, chanho61.park@...sung.com,
sw0312.kim@...sung.com, linux-samsung-soc@...r.kernel.org,
linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH v5 10/13] clk: samsung: exynos5433: Add clocks for
CMU_BUS{0|1|2} domains
Hi Sylwester,
On 02/04/2015 10:02 PM, Sylwester Nawrocki wrote:
> Hi Chanwoo,
>
> On 02/02/15 15:24, Chanwoo Choi wrote:
>> This patch adds the mux/divider/gate clocks for CMU_BUS{0|1|2} domains
>> which contain global data buses clocked at up the 400MHz. These blocks
>> transfer data between DRAM and various sub-blocks. These clock domains
>> also contain global peripheral buses clocked at 67/111/200/222/266/333/400
>> MHz and used for register accesses.
>
>> +/*
>> + * Register offset definitions for CMU_BUS{0|1|2}
>> + */
>> +#define DIV_BUS 0x0600
>> +#define DIV_STAT_BUS 0x0700
>> +#define ENABLE_ACLK_BUS 0x0800
>> +#define ENABLE_PCLK_BUS 0x0900
>> +#define ENABLE_IP_BUS0 0x0b00
>> +#define ENABLE_IP_BUS1 0x0b04
>> +
>> +#define MUX_SEL_BUS2 0x0200 /* Only for CMU_BUS2 */
>> +#define MUX_ENABLE_BUS2 0x0300 /* Only for CMU_BUS2 */
>> +#define MUX_STAT_BUS2 0x0400 /* Only for CMU_BUS2 */
>> +
>> +/* list of all parent clock list */
>> +PNAME(mout_aclk_bus2_400_p) = { "oscclk", "aclk_bus2_400", };
>> +
>> +#define CMU_BUS_COMMON_CLK_REGS \
>> + DIV_BUS, \
>> + DIV_STAT_BUS, \
>> + ENABLE_ACLK_BUS, \
>> + ENABLE_PCLK_BUS, \
>> + ENABLE_IP_BUS0, \
>> + ENABLE_IP_BUS1
>> +
>> +static unsigned long bus01_clk_regs[] __initdata = {
>> + CMU_BUS_COMMON_CLK_REGS,
>> +};
>> +
>> +static unsigned long bus2_clk_regs[] __initdata = {
>> + MUX_SEL_BUS2,
>> + MUX_ENABLE_BUS2,
>> + MUX_STAT_BUS2,
>> + CMU_BUS_COMMON_CLK_REGS,
>> +};
>> +
>> +static struct samsung_div_clock bus0_div_clks[] __initdata = {
>> + /* DIV_BUS0 */
>> + DIV(CLK_DIV_PCLK_BUS_133, "div_pclk_bus0_133", "aclk_bus0_400",
>> + DIV_BUS, 0, 3),
>> +};
>> +
>> +/* CMU_BUS0 clocks */
>> +static struct samsung_gate_clock bus0_gate_clks[] __initdata = {
>> + /* ENABLE_ACLK_BUS0 */
>> + GATE(CLK_ACLK_AHB2APB_BUSP, "aclk_ahb2apb_bus0p", "div_pclk_bus0_133",
>> + ENABLE_ACLK_BUS, 4, CLK_IGNORE_UNUSED, 0),
>> + GATE(CLK_ACLK_BUSNP_133, "aclk_bus0np_133", "div_pclk_bus0_133",
>> + ENABLE_ACLK_BUS, 2, CLK_IGNORE_UNUSED, 0),
>> + GATE(CLK_ACLK_BUSND_400, "aclk_bus0nd_400", "aclk_bus0_400",
>> + ENABLE_ACLK_BUS, 0, CLK_IGNORE_UNUSED, 0),
>> +
>> + /* ENABLE_PCLK_BUS0 */
>> + GATE(CLK_PCLK_BUSSRVND_133, "pclk_bus0srvnd_133", "div_pclk_bus0_133",
>> + ENABLE_PCLK_BUS, 2, 0, 0),
>> + GATE(CLK_PCLK_PMU_BUS, "pclk_pmu_bus0", "div_pclk_bus0_133",
>> + ENABLE_PCLK_BUS, 1, CLK_IGNORE_UNUSED, 0),
>> + GATE(CLK_PCLK_SYSREG_BUS, "pclk_sysreg_bus0", "div_pclk_bus0_133",
>> + ENABLE_PCLK_BUS, 0, CLK_IGNORE_UNUSED, 0),
>> +};
>> +
>> +/* CMU_BUS1 clocks */
>> +static struct samsung_div_clock bus1_div_clks[] __initdata = {
>> + /* DIV_BUS1 */
>> + DIV(CLK_DIV_PCLK_BUS_133, "div_pclk_bus1_133", "aclk_bus1_400",
>> + DIV_BUS, 0, 3),
>> +};
>> +
>> +static struct samsung_gate_clock bus1_gate_clks[] __initdata = {
>> + /* ENABLE_ACLK_BUS1 */
>> + GATE(CLK_ACLK_AHB2APB_BUSP, "aclk_ahb2apb_bus1p", "div_pclk_bus1_133",
>> + ENABLE_ACLK_BUS, 4, CLK_IGNORE_UNUSED, 0),
>> + GATE(CLK_ACLK_BUSNP_133, "aclk_bus1np_133", "div_pclk_bus1_133",
>> + ENABLE_ACLK_BUS, 2, CLK_IGNORE_UNUSED, 0),
>> + GATE(CLK_ACLK_BUSND_400, "aclk_bus1nd_400", "aclk_bus1_400",
>> + ENABLE_ACLK_BUS, 0, CLK_IGNORE_UNUSED, 0),
>> +
>> + /* ENABLE_PCLK_BUS1 */
>> + GATE(CLK_PCLK_BUSSRVND_133, "pclk_bus1srvnd_133", "div_pclk_bus1_133",
>> + ENABLE_PCLK_BUS, 2, 0, 0),
>> + GATE(CLK_PCLK_PMU_BUS, "pclk_pmu_bus1", "div_pclk_bus1_133",
>> + ENABLE_PCLK_BUS, 1, CLK_IGNORE_UNUSED, 0),
>> + GATE(CLK_PCLK_SYSREG_BUS, "pclk_sysreg_bus1", "div_pclk_bus1_133",
>> + ENABLE_PCLK_BUS, 0, CLK_IGNORE_UNUSED, 0),
>> +};
>> +
>> +/* CMU_BUS2 clocks */
>> +static struct samsung_mux_clock bus2_mux_clks[] __initdata = {
>> + /* MUX_SEL_BUS2 */
>> + MUX(CLK_MOUT_ACLK_BUS2_400_USER, "mout_aclk_bus2_400_user",
>> + mout_aclk_bus2_400_p, MUX_SEL_BUS2, 0, 1),
>> +};
>> +
>> +static struct samsung_div_clock bus2_div_clks[] __initdata = {
>> + /* DIV_BUS2 */
>> + DIV(CLK_DIV_PCLK_BUS_133, "div_pclk_bus2_133",
>> + "mout_aclk_bus2_400_user", DIV_BUS, 0, 3),
>> +};
>> +
>> +static struct samsung_gate_clock bus2_gate_clks[] __initdata = {
>> + /* ENABLE_ACLK_BUS2 */
>> + GATE(CLK_ACLK_AHB2APB_BUSP, "aclk_ahb2apb_bus2p", "div_pclk_bus2_133",
>> + ENABLE_ACLK_BUS, 3, CLK_IGNORE_UNUSED, 0),
>> + GATE(CLK_ACLK_BUSNP_133, "aclk_bus2np_133", "div_pclk_bus2_133",
>> + ENABLE_ACLK_BUS, 2, CLK_IGNORE_UNUSED, 0),
>> + GATE(CLK_ACLK_BUS2BEND_400, "aclk_bus2bend_400",
>> + "mout_aclk_bus2_400_user", ENABLE_ACLK_BUS,
>> + 1, CLK_IGNORE_UNUSED, 0),
>> + GATE(CLK_ACLK_BUS2RTND_400, "aclk_bus2rtnd_400",
>> + "mout_aclk_bus2_400_user", ENABLE_ACLK_BUS,
>> + 0, CLK_IGNORE_UNUSED, 0),
>> +
>> + /* ENABLE_PCLK_BUS2 */
>> + GATE(CLK_PCLK_BUSSRVND_133, "pclk_bus2srvnd_133", "div_pclk_bus2_133",
>> + ENABLE_PCLK_BUS, 2, 0, 0),
>> + GATE(CLK_PCLK_PMU_BUS, "pclk_pmu_bus2", "div_pclk_bus2_133",
>> + ENABLE_PCLK_BUS, 1, CLK_IGNORE_UNUSED, 0),
>> + GATE(CLK_PCLK_SYSREG_BUS, "pclk_sysreg_bus2", "div_pclk_bus2_133",
>> + ENABLE_PCLK_BUS, 0, CLK_IGNORE_UNUSED, 0),
>> +};
>> +
>> +#define CMU_BUS_INFO_CLKS(id) \
>> + .div_clks = bus##id##_div_clks, \
>> + .nr_div_clks = ARRAY_SIZE(bus##id##_div_clks), \
>> + .gate_clks = bus##id##_gate_clks, \
>> + .nr_gate_clks = ARRAY_SIZE(bus##id##_gate_clks), \
>> + .nr_clk_ids = BUSx_NR_CLK
>> +
>> +static struct samsung_cmu_info bus0_cmu_info __initdata = {
>> + CMU_BUS_INFO_CLKS(0),
>> + .clk_regs = bus01_clk_regs,
>> + .nr_clk_regs = ARRAY_SIZE(bus01_clk_regs),
>> +};
>> +
>> +static struct samsung_cmu_info bus1_cmu_info __initdata = {
>> + CMU_BUS_INFO_CLKS(1),
>> + .clk_regs = bus01_clk_regs,
>> + .nr_clk_regs = ARRAY_SIZE(bus01_clk_regs),
>> +};
>> +
>> +static struct samsung_cmu_info bus2_cmu_info __initdata = {
>> + CMU_BUS_INFO_CLKS(2),
>> + .mux_clks = bus2_mux_clks,
>> + .nr_mux_clks = ARRAY_SIZE(bus2_mux_clks),
>> + .clk_regs = bus2_clk_regs,
>> + .nr_clk_regs = ARRAY_SIZE(bus2_clk_regs),
>> +};
>> +
>> +#define exynos5433_cmu_bus_init(id) \
>> +static void __init exynos5433_cmu_bus##id##_init(struct device_node *np)\
>> +{ \
>> + samsung_cmu_register_one(np, &bus##id##_cmu_info); \
>> +} \
>> +CLK_OF_DECLARE(exynos5433_cmu_bus##id, \
>> + "samsung,exynos5433-cmu-bus"#id, \
>> + exynos5433_cmu_bus##id##_init)
>> +
>> +exynos5433_cmu_bus_init(0);
>> +exynos5433_cmu_bus_init(1);
>> +exynos5433_cmu_bus_init(2);
>
> I picked up all the exynos5433 patches, however I don't quite like
> how we re defining 3 almost identical sets of data for CMU_BUS0/1/2.
Thanks for your pickup. In case of CMU_BUS0/1/2, I think there is a update
to remain.
>
> We already have the parent clocks to CMU_BUSn specified in DT, then
> we could list the CMU_BUSn output clock names using clock-output-names
> property. We could also differentiate CMU_BUS instances with an OF
> alias id, which could be used to create the CMU_BUS internal divider
> clock names (div_pclk_bus{0,1,2}_133).
>
> This would require new data structures to store the register bit fields
> for each clock, clk names would be filled from DT. It likely wouldn't
> be much less code this way, if not more. And we would need to handle
> various clock types somehow, thus this would imply changes in the common
> samsung clk code. I guess it's worth to try something like this in
> future (for any new SoCs) though, because repeating data as is done
> above doesn't look like a pattern we'd like to stay with.
I agree your opinion completely. If you need to help or co-work,
I can help in a variety of ways (e.g., test, implementation, debugging or other ).
Best Regards,
Chanwoo Choi
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