linux-kernel - Re: [PATCH] spmi: pmic_arb: add support for hw version 2

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Message-ID: <54C27ED9.9080403@mm-sol.com>
Date:	Fri, 23 Jan 2015 19:03:21 +0200
From:	Stanimir Varbanov <svarbanov@...sol.com>
To:	Gilad Avidov <gavidov@...eaurora.org>
CC:	sdharia@...eaurora.org, mlocke@...eaurora.org,
	linux-arm-msm@...r.kernel.org, gregkh@...uxfoundation.org,
	linux-kernel@...r.kernel.org, iivanov@...sol.com,
	galak@...eaurora.org, agross@...eaurora.org
Subject: Re: [PATCH] spmi: pmic_arb: add support for hw version 2

Hi Gilad,

On 01/20/2015 03:10 AM, Gilad Avidov wrote:
> Qualcomm PMIC Arbiter version-2 changes from version-1 are:
> 
> - Some diffrent register offsets.
> - New channel register space, one per PMIC peripheral (ppid).
>   All tx tarffic uses these channels.
> - New observer register space. All rx trafic uses this space.
> - Diffrent command format for spmi command registers.
> 
> Signed-off-by: Gilad Avidov <gavidov@...eaurora.org>
> Acked-by: Sagar Dharia <sdharia@...eaurora.org>
> ---
>  .../bindings/spmi/qcom,spmi-pmic-arb.txt           |  11 +-
>  drivers/spmi/spmi-pmic-arb.c                       | 295 ++++++++++++++++++---
>  2 files changed, 263 insertions(+), 43 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/spmi/qcom,spmi-pmic-arb.txt b/Documentation/devicetree/bindings/spmi/qcom,spmi-pmic-arb.txt
> index 715d099..827bd21 100644
> --- a/Documentation/devicetree/bindings/spmi/qcom,spmi-pmic-arb.txt
> +++ b/Documentation/devicetree/bindings/spmi/qcom,spmi-pmic-arb.txt
> @@ -1,11 +1,11 @@
>  Qualcomm SPMI Controller (PMIC Arbiter)
>  
> -The SPMI PMIC Arbiter is found on the Snapdragon 800 Series.  It is an SPMI
> +The SPMI PMIC Arbiter is found on Snapdragon chipsets.  It is an SPMI
>  controller with wrapping arbitration logic to allow for multiple on-chip
>  devices to control a single SPMI master.
>  
> -The PMIC Arbiter can also act as an interrupt controller, providing interrupts
> -to slave devices.
> +The PMIC Arbiter is also an interrupt controller, interrupting the Snapdragon
> +on dtection of a sequence initiated by a request-capable-slave to the master.
>  

<snip>

>  
> -/* Non-data command */
> -static int pmic_arb_cmd(struct spmi_controller *ctrl, u8 opc, u8 sid)
> +static int
> +pmic_arb_non_data_cmd_v1(struct spmi_controller *ctrl, u8 opc, u8 sid)
>  {
>  	struct spmi_pmic_arb_dev *pmic_arb = spmi_controller_get_drvdata(ctrl);
>  	unsigned long flags;
>  	u32 cmd;
>  	int rc;
> -
> -	/* Check for valid non-data command */
> -	if (opc < SPMI_CMD_RESET || opc > SPMI_CMD_WAKEUP)
> -		return -EINVAL;
> +	u32 offset = pmic_arb->ver->offset(pmic_arb, sid, 0);
>  
>  	cmd = ((opc | 0x40) << 27) | ((sid & 0xf) << 20);
>  
>  	raw_spin_lock_irqsave(&pmic_arb->lock, flags);
> -	pmic_arb_base_write(pmic_arb, PMIC_ARB_CMD(pmic_arb->channel), cmd);
> -	rc = pmic_arb_wait_for_done(ctrl);
> +	pmic_arb_base_write(pmic_arb, offset + PMIC_ARB_CMD, cmd);
> +	rc = pmic_arb_wait_for_done(ctrl, pmic_arb->wr_base, sid, 0);
>  	raw_spin_unlock_irqrestore(&pmic_arb->lock, flags);
>  
>  	return rc;
>  }
>  
> +/* Unsupported by HW */
> +static int
> +pmic_arb_non_data_cmd_v2(struct spmi_controller *ctrl, u8 opc, u8 sid)
> +{
> +	return -EOPNOTSUPP;
> +}

Does pmic arbiter v2 supports SPMI_CMD_WAKEUP and SPMI_CMD_SHUTDOWN
commands? If so how we send those commands to the arbiter when the
.non_data_cmd operation returns EOPNOTSUPP. If we returning EOPNOTSUPP
the spmi bus .probe method will not call spmi driver .probe. See spmi.c
spmi_drv_probe().

<snip>


-- 
regards,
Stan
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