Hello Tomasz,
On 7 November 2013 19:53, Tomasz Figa <t.figa@xxxxxxxxxxx> wrote:
> Hi Naveen,
>
> On Thursday 07 of November 2013 18:37:49 Naveen Krishna Chatradhi wrote:
>> Exynos5420 SoC has per core thermal management unit.
>> 5 TMU channels 4 for CPUs and 5th for GPU.
>>
>> This patch adds the device tree nodes to the DT device list.
>>
>> Nodes carry the misplaced second base address and the second
>> clock to access the misplaced base address.
>>
>> Signed-off-by: Leela Krishna Amudala <l.krishna@xxxxxxxxxxx>
>> Signed-off-by: Naveen Krishna Chatradhi <ch.naveen@xxxxxxxxxxx>
>> Signed-off-by: Andrew Bresticker <abrestic@xxxxxxxxxxxx>
>> ---
>> Changes since v1:
>> 1. Nodes carry the misplaced second base address and the second
>> clock to access the misplaced base address.
>> 2. Correct the clock number for the TMU4
>
> First of all, this patch should be a part of the whole series adding
> support for thermal on Exynos 5420.
Right, Reason why i posted this patch myself fixing the nits (As Leela
and i work closely)
Should have been along with the set.
>
> In addition, see my comment below.
>
>> arch/arm/boot/dts/exynos5420.dtsi | 48 +++++++++++++++++++++++++++++++++++++
>> 1 file changed, 48 insertions(+)
>>
>> diff --git a/arch/arm/boot/dts/exynos5420.dtsi b/arch/arm/boot/dts/exynos5420.dtsi
>> index 6ffefd1..d736b40 100644
>> --- a/arch/arm/boot/dts/exynos5420.dtsi
>> +++ b/arch/arm/boot/dts/exynos5420.dtsi
>> @@ -369,4 +369,52 @@
>> clock-names = "gscl";
>> samsung,power-domain = <&gsc_pd>;
>> };
>> +
>> + /* tmu for CPU0 */
>> + tmu@10060000 {
>> + compatible = "samsung,exynos5420-tmu";
>> + reg = <0x10060000 0x100>;
>> + interrupts = <0 65 0>;
>> + clocks = <&clock 318>;
>> + clock-names = "tmu_apbif";
>> + };
>> +
>> + /* tmu for CPU1 */
>> + tmu@10064000 {
>> + compatible = "samsung,exynos5420-tmu";
>> + reg = <0x10064000 0x100>;
>> + interrupts = <0 183 0>;
>> + clocks = <&clock 318>;
>> + clock-names = "tmu_apbif";
>> + };
>> +
>> + /* tmu for CPU2 */
>> + tmu@10068000 {
>> + compatible = "samsung,exynos5420-tmu";
>> + /* 2nd reg is for the misplaced TRIMINFO register */
>
> Instead of this comment, such broken TMU variant should use a separate
> compatible value, like "samsung,exynos5420-tmu-broken-triminfo", like
> I mentioned in my comments to your other patch.
Will make a note of it.
>
> For this compatible value, both second reg entry and second clock would
> be required.
>
>> + reg = <0x10068000 0x100>, <0x1006c000 0x4>;
>> + interrupts = <0 184 0>;
>> + clocks = <&clock 318>;
>> + clock-names = "tmu_apbif";
>> + };
>> +
>> + /* tmu for CPU3 */
>> + tmu@1006c000 {
>> + compatible = "samsung,exynos5420-tmu";
>> + /* 2nd reg is for the misplaced TRIMINFO register */
>> + reg = <0x1006c000 0x100>, <0x100a0000 0x4>;
>> + interrupts = <0 185 0>;
>> + clocks = <&clock 318>, <&clock 319>;
>> + clock-names = "tmu_apbif", "tmu_apbif_triminfo";
>
> The "tmu_apbif_triminfo" clock is not specified in exynos-thermal binding
> documentation. In addition, the patch of yours adding support for second
> clock uses another name - "tmu_apbif_sec".
>
> As for the name itself, I would prefer "tmu_apbif_triminfo" as it's more
> meaningful.
TMU hardware on Exynos5440 and Exynos5420 has two different abnormalities
On Exynos5440 Some registers are interleaved between the channels
On Exynos5420, TRIMINFO is misplaced between, channels 2, 3 and 4.
having second_base was for the fix by Amit to address Exynos5440 problem,
Which was already merged.
After several reviews i tried to solve it by reusing the second_base
for Exynos5420 aswell.
Hence, I tried to use the "clk_sec" or "clk_second" which will rhyme
along with the
"second_base" in the driver.
I'm still not sure this having second clock is needed for Exynos5440 aswell.
Will figure it out tomorrow.
>
> Best regards,
> Tomasz
>
--
Shine bright,
(: Nav :)
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