Re: [PATCH 1/5] mmc: sdhci-pxav3: fix optional clock name
From: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Date: 2015-10-15 21:41:29
Also in:
linux-arm-kernel, linux-clk, linux-mmc, lkml
On 12.10.2015 07:46, Jisheng Zhang wrote:
Commit 8afdc9cca27f ("mmc: sdhci-pxav3: Get optional core clock") adds
additional optional clock support, but the clock names isn't correct.
The current "io" clock is really the PXAv3 SDHCI IP's "core" clock
which is manadatory. The current "core" clock is really the IP's "axi"
clock which is optional.
Signed-off-by: Jisheng Zhang <redacted>
---
.../devicetree/bindings/mmc/sdhci-pxa.txt | 8 ++---
arch/arm/boot/dts/berlin2.dtsi | 6 ++--
arch/arm/boot/dts/berlin2cd.dtsi | 2 +-
arch/arm/boot/dts/berlin2q.dtsi | 2 +-
drivers/mmc/host/sdhci-pxav3.c | 40 +++++++++++-----------
5 files changed, 29 insertions(+), 29 deletions(-)Jisheng, Please split the DT changes from the driver changes.
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diff --git a/Documentation/devicetree/bindings/mmc/sdhci-pxa.txt b/Documentation/devicetree/bindings/mmc/sdhci-pxa.txt index 3d1b449..25d5ba8 100644 --- a/Documentation/devicetree/bindings/mmc/sdhci-pxa.txt +++ b/Documentation/devicetree/bindings/mmc/sdhci-pxa.txt@@ -17,9 +17,9 @@ Required properties: - reg names: should be "sdhci", "mbus", "conf-sdio3". only mandatory for "marvell,armada-380-sdhci" - clocks: Array of clocks required for SDHCI; requires at least one for - I/O clock. + core clock. - clock-names: Array of names corresponding to clocks property; shall be - "io" for I/O clock and "core" for optional core clock. + "core" for core clock and "axi" for optional axi clock.
s/axi/bus/ ?
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Optional properties: - mrvl,clk-delay-cycles: Specify a number of cycles to delay for tuning.@@ -32,7 +32,7 @@ sdhci@d4280800 { bus-width = <8>; interrupts = <27>; clocks = <&chip CLKID_SDIO1XIN>, <&chip CLKID_SDIO1>; - clock-names = "io", "core"; + clock-names = "core", "axi";
This will break backward compatibility, right?
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non-removable; mrvl,clk-delay-cycles = <31>; };@@ -45,6 +45,6 @@ sdhci@d8000 { <0x18454 0x4>; interrupts = <0 25 0x4>; clocks = <&gateclk 17>; - clock-names = "io"; + clock-names = "core"; mrvl,clk-delay-cycles = <0x1F>; };
[...]
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diff --git a/drivers/mmc/host/sdhci-pxav3.c b/drivers/mmc/host/sdhci-pxav3.c index f5edf9d..cec95f1 100644 --- a/drivers/mmc/host/sdhci-pxav3.c +++ b/drivers/mmc/host/sdhci-pxav3.c@@ -59,8 +59,8 @@ #define SDCE_MISC_INT_EN (1<<1) struct sdhci_pxa { + struct clk *clk_axi;
s/clk_axi/clk_bus/g
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struct clk *clk_core; - struct clk *clk_io; u8 power_mode; void __iomem *sdio3_conf_reg; };@@ -381,20 +381,20 @@ static int sdhci_pxav3_probe(struct platform_device *pdev) pltfm_host = sdhci_priv(host); pltfm_host->priv = pxa; - pxa->clk_io = devm_clk_get(dev, "io"); - if (IS_ERR(pxa->clk_io)) - pxa->clk_io = devm_clk_get(dev, NULL); - if (IS_ERR(pxa->clk_io)) { - dev_err(dev, "failed to get io clock\n"); - ret = PTR_ERR(pxa->clk_io); + pxa->clk_core = devm_clk_get(dev, "core");
To maintain backward compatibility, we should still devm_clk_get(dev, "io") here - or even better, first probe for "io" to catch old binding semantics including old "core"/"bus" misnaming. If we detected old semantics, print a warning that firmware should be updated. Sebastian
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+ if (IS_ERR(pxa->clk_core)) + pxa->clk_core = devm_clk_get(dev, NULL); + if (IS_ERR(pxa->clk_core)) { + dev_err(dev, "failed to get core clock\n"); + ret = PTR_ERR(pxa->clk_core); goto err_clk_get; } - pltfm_host->clk = pxa->clk_io; - clk_prepare_enable(pxa->clk_io); + pltfm_host->clk = pxa->clk_core; + clk_prepare_enable(pxa->clk_core); - pxa->clk_core = devm_clk_get(dev, "core"); - if (!IS_ERR(pxa->clk_core)) - clk_prepare_enable(pxa->clk_core); + pxa->clk_axi = devm_clk_get(dev, "axi"); + if (!IS_ERR(pxa->clk_axi)) + clk_prepare_enable(pxa->clk_axi); /* enable 1/8V DDR capable */ host->mmc->caps |= MMC_CAP_1_8V_DDR;@@ -475,8 +475,8 @@ err_add_host: err_of_parse: err_cd_req: err_mbus_win: - clk_disable_unprepare(pxa->clk_io); clk_disable_unprepare(pxa->clk_core); + clk_disable_unprepare(pxa->clk_axi); err_clk_get: sdhci_pltfm_free(pdev); return ret;@@ -494,8 +494,8 @@ static int sdhci_pxav3_remove(struct platform_device *pdev) sdhci_remove_host(host, 1); - clk_disable_unprepare(pxa->clk_io); clk_disable_unprepare(pxa->clk_core); + clk_disable_unprepare(pxa->clk_axi); sdhci_pltfm_free(pdev);@@ -542,9 +542,9 @@ static int sdhci_pxav3_runtime_suspend(struct device *dev) if (ret) return ret; - clk_disable_unprepare(pxa->clk_io); - if (!IS_ERR(pxa->clk_core)) - clk_disable_unprepare(pxa->clk_core); + clk_disable_unprepare(pxa->clk_core); + if (!IS_ERR(pxa->clk_axi)) + clk_disable_unprepare(pxa->clk_axi); return 0; }@@ -555,9 +555,9 @@ static int sdhci_pxav3_runtime_resume(struct device *dev) struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); struct sdhci_pxa *pxa = pltfm_host->priv; - clk_prepare_enable(pxa->clk_io); - if (!IS_ERR(pxa->clk_core)) - clk_prepare_enable(pxa->clk_core); + clk_prepare_enable(pxa->clk_core); + if (!IS_ERR(pxa->clk_axi)) + clk_prepare_enable(pxa->clk_axi); return sdhci_runtime_resume_host(host); }