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mmc: pwrseq: simplify alloc/free hooks
The alloc() and free() hooks required each pwrseq implementation to set host->pwrseq themselves. This is error-prone and could be done at a higher level if alloc() was changed to return a pointer to a struct mmc_pwrseq instead of an error code. This patch performs this change and moves the burden of maintaining host->pwrseq from the power sequence hooks to the pwrseq code. Signed-off-by: Alexandre Courbot <acourbot@nvidia.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
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