linux-kernel - Re: [PATCH v10 1/3] mmc: sdhci-msm: Qualcomm SDHCI binding documentation

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Date:	Thu, 06 Mar 2014 19:45:55 +0200
From:	Georgi Djakov <gdjakov@...sol.com>
To:	Rob Herring <robherring2@...il.com>
CC:	"linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
	Chris Ball <cjb@...top.org>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Stephen Warren <swarren@...dotorg.org>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Rob Landley <rob@...dley.net>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-arm-msm <linux-arm-msm@...r.kernel.org>
Subject: Re: [PATCH v10 1/3] mmc: sdhci-msm: Qualcomm SDHCI binding documentation

On 03/05/2014 08:56 AM, Rob Herring wrote:
> On Tue, Mar 4, 2014 at 1:27 PM, Georgi Djakov <gdjakov@...sol.com> wrote:
[..]
>> +Required properties:
>> +- compatible: Should contain "qcom,sdhci-msm-v4".
>> +- reg: Base address and length of the register set listed in reg-names.
>> +- reg-names: Should contain the following:
>> +       "hc_mem"   - Host controller register map
>> +       "core_mem" - SD Core register map
>
> reg-names should not be required and the order specified by the binding.
>

Ok, Rob! Thanks!

>> +- interrupts: Should contain an interrupt-specifiers for the interrupts listed in interrupt-names.
>> +- interrupt-names: Should contain the following:
>> +       "hc_irq"     - Host controller interrupt
>> +       "pwr_irq"    - PMIC interrupt
>
> Same for interrupt-names.
>

Ok.

>> +- vdd-supply: Phandle to the regulator for the vdd (core voltage) supply.
>> +- vdd-io-supply: Phandle to the regulator for the vdd-io (i/o voltage) supply.
>> +- pinctrl-names: Should contain only one value - "default".
>> +- pinctrl-0: Should specify pin control groups used for this controller.
>> +- clocks: A list of phandle + clock-specifier pairs for the clocks listed in clock-names.
>> +- clock-names: Should contain the following:
>> +       "iface" - Main peripheral bus clock (PCLK/HCLK - AHB Bus clock) (required)
>> +       "core"  - SDC MMC clock (MCLK) (required)
>> +       "bus"   - SDCC bus voter clock (optional)
>> +
>> +Example:
>> +
>> +       sdhc_1: sdhci@...24900 {
>> +               compatible = "qcom,sdhci-msm-v4";
>> +               reg = <0xf9824900 0x11c>, <0xf9824000 0x800>;
>
> Are there cases where these are really in a different 4KB range? If
> not, this should just be 1 range.
>

Thanks for your suggestion. This sounds reasonable, but in this case,
I think that it might be better leaving the memory regions separated as 
it will help avoiding code duplication. I am using the generic 
sdhci_pltfm_init(), which assumes that the first resource is the HC 
iomem and configures the host. If I merge them, the HC address will be 
offset and this might require duplicating some of the init code.
Is it acceptable to leave it this way?

BR,
Georgi
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