linux-kernel - [PATCH v4 0/2] drivers: bus: Add Freescale i.MX8qxp pixel link MSI bus support

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Message-Id: <20220814074338.453608-1-victor.liu@nxp.com>
Date:   Sun, 14 Aug 2022 15:43:36 +0800
From:   Liu Ying <victor.liu@....com>
To:     devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Cc:     robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        shawnguo@...nel.org, s.hauer@...gutronix.de, kernel@...gutronix.de,
        festevam@...il.com, linux-imx@....com, saravanak@...gle.com,
        gregkh@...uxfoundation.org, geert+renesas@...der.be,
        krzysztof.kozlowski@...aro.org, robh@...nel.org
Subject: [PATCH v4 0/2] drivers: bus: Add Freescale i.MX8qxp pixel link MSI bus support

Hi,

This series aims to add Freescale i.MX8qxp pixel link MSI bus support
by using the existing simple-pm-bus driver. A power domain and two input
clocks need to be enabled before the MSI bus accesses it's child devices,
which matches what a simple power-managed bus is(See simple-pm-bus.yaml).

Patch 1 enables/disables functional clock(s) as a bulk in the
simple-pm-bus driver when the simple-pm-bus is being power managed,
since the MSI bus takes the two input clocks as functional clocks.

Patch 2 adds dt-bindings for the MSI bus.

v3->v4:
* Drop patch 1 in v3, because simple-bus/simple-mfd devices probed by the
  simple-pm-bus driver should not be child nodes of simple-pm-bus at all,
  as simple-bus/simple-mfd's child devices PM operations cannot be propagated
  to simple-pm-bus. Those simple-bus/simple-mfd devices needs dedicated drivers.
* Drop unnecessary 'bus == NULL' check from simple_pm_bus_runtime_{suspend,resume}.
  for patch 1 in v4. (Geert)
* Add Geert's R-b tag on patch 1 in v4.
* Add child nodes in the example MSI bus node of the MSI bus dt-binding. (Krzysztof)

v2->v3:
* Add a pattern property to allow child nodes in the MSI bus dt-binding. (Rob)

v1->v2:
Address Krzysztof's comments on patch 3:
* Add a select to explicitly select the MSI bus dt-binding.
* List 'simple-pm-bus' explicitly as one item of compatible strings.
* Require compatible and reg properties.
* Put reg property just after compatible property in example.

Liu Ying (2):
  drivers: bus: simple-pm-bus: Use clocks
  dt-bindings: bus: Add Freescale i.MX8qxp pixel link MSI bus binding

 .../bus/fsl,imx8qxp-pixel-link-msi-bus.yaml   | 232 ++++++++++++++++++
 drivers/bus/simple-pm-bus.c                   |  48 ++++
 2 files changed, 280 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/bus/fsl,imx8qxp-pixel-link-msi-bus.yaml

-- 
2.37.1